"use strict"

let cards = require("./cards.js")

const Afghan = 'Afghan'
const British = 'British'
const Russian = 'Russian'

const Political = 'Political'
const Intelligence = 'Intelligence'
const Economic = 'Economic'
const Military = 'Military'

const Persia = 201
const Transcaspia = 202
const Herat = 203
const Kabul = 204
const Kandahar = 205
const Punjab = 206

const Persia_Transcaspia = 301
const Persia_Herat = 302
const Transcaspia_Herat = 303
const Transcaspia_Kabul = 304
const Herat_Kabul = 305
const Herat_Kandahar = 306
const Kabul_Kandahar = 307
const Kabul_Punjab = 308
const Kandahar_Punjab = 309

const Gift2 = 400
const Gift4 = 401
const Gift6 = 402
const Safe_House = 500

const first_region = 201
const last_region = 206

const PUBLIC_WITHDRAWAL = 111
const SAFE_HOUSE_1 = 41
const SAFE_HOUSE_2 = 72

const player_names = [
	"Gray",
	"Blue",
	"Tan",
	"Red",
	"Black",
	"None"
]

const player_names_by_scenario = {
	"2P": player_names.slice(0, 2),
	"3P": player_names.slice(0, 3),
	"4P": player_names.slice(0, 4),
	"5P": player_names.slice(0, 5),
}

const player_index = Object.fromEntries(Object.entries(player_names).map(([k,v])=>[v,k|0]))

const region_names = {
	[Persia]: "Persia",
	[Transcaspia]: "Transcaspia",
	[Herat]: "Herat",
	[Kabul]: "Kabul",
	[Kandahar]: "Kandahar",
	[Punjab]: "Punjab",
}

const region_index = {
	"Persia": Persia,
	"Transcaspia": Transcaspia,
	"Herat": Herat,
	"Kabul": Kabul,
	"Kandahar": Kandahar,
	"Punjab": Punjab,
}

cards.forEach(card => {
	if (card) {
		card.region = region_index[card.region]
		if (card.name === 'EVENT')
			card.name = card.if_discarded + " / " + card.if_purchased
	}
})

const border_names = {
	[Persia_Transcaspia]: "Persia/Transcaspia",
	[Persia_Herat]: "Persia/Herat",
	[Transcaspia_Herat]: "Transcaspia/Herat",
	[Transcaspia_Kabul]: "Transcaspia/Kabul",
	[Herat_Kabul]: "Herat/Kabul",
	[Herat_Kandahar]: "Herat/Kandahar",
	[Kabul_Kandahar]: "Kabul/Kandahar",
	[Kabul_Punjab]: "Kabul/Punjab",
	[Kandahar_Punjab]: "Kandahar/Punjab",
}

const borders = {
	[Transcaspia]: [ Persia_Transcaspia, Transcaspia_Herat, Transcaspia_Kabul ],
	[Kabul]: [ Transcaspia_Kabul, Herat_Kabul, Kabul_Kandahar, Kabul_Punjab ],
	[Punjab]: [ Kabul_Punjab, Kandahar_Punjab ],
	[Persia]: [ Persia_Transcaspia, Persia_Herat ],
	[Herat]: [ Transcaspia_Herat, Persia_Herat, Herat_Kabul, Herat_Kandahar ],
	[Kandahar]: [ Kabul_Kandahar, Herat_Kandahar, Kandahar_Punjab ],
}

const roads = {
	[Transcaspia]: [ Persia, Herat, Kabul ],
	[Kabul]: [ Transcaspia, Herat, Kandahar, Punjab ],
	[Punjab]: [ Kabul, Kandahar ],
	[Persia]: [ Transcaspia, Herat ],
	[Herat]: [ Transcaspia, Persia, Kabul, Kandahar ],
	[Kandahar]: [ Kabul, Herat, Punjab ],
}

function is_dominance_check(c) {
	return c >= 101 && c <= 104
}

function is_event_card(c) {
	return c > 100
}

let game = null
let player = null
let view = null

let states = {}

const scenario_player_count = { "2P": 2, "3P": 3, "4P": 4, "5P": 5 }

exports.scenarios = [ "3P", "4P", "5P", "2P" ]

exports.roles = function (scenario) {
	return player_names_by_scenario[scenario]
}

function random(n) {
	if (game.rng === 1)
		return ((game.seed = game.seed * 69621 % 0x7fffffff) / 0x7fffffff) * n | 0
	return (game.seed = game.seed * 200105 % 34359738337) % n
}

function shuffle(deck) {
	for (let i = deck.length - 1; i > 0; --i) {
		let j = random(i + 1)
		let tmp = deck[j]
		deck[j] = deck[i]
		deck[i] = tmp
	}
}

function remove_from_array(array, item) {
	let i = array.indexOf(item)
	if (i >= 0)
		array.splice(i, 1)
}

function set_active(new_active) {
	if (game.active !== new_active)
		clear_undo()
	game.active = new_active
	update_aliases()
}

function update_aliases() {
	player = game.players[game.active]
}

function find_card_in_market(c) {
	for (let row = 0; row < 2; ++row)
		for (let col = 0; col < 6; ++col)
			if (c === game.market_cards[row][col])
				return [row, col]
	return null
}

function find_card_in_court(c) {
	for (let p = 0; p < game.players.length; ++p) {
		let court = game.players[p].court
		for (let i = 0; i < court.length; ++i)
			if (court[i] === c)
				return p
	}
	return -1
}

function next_player(current) {
	return (current + 1) % game.players.length
}

function a_coalition(s) {
	switch (s) {
	case Afghan: return "an Afghan"
	case British: return "a British"
	case Russian: return "a Russian"
	}
}

function logbr() {
	if (game.log.length > 0 && game.log[game.log.length-1] !== "")
		game.log.push("")
}

function log(msg) {
	game.log.push(msg)
}

function logi(msg) {
	game.log.push(">" + msg)
}

function deep_copy(original) {
	if (Array.isArray(original)) {
		let n = original.length
		let copy = new Array(n)
		for (let i = 0; i < n; ++i) {
			let v = original[i]
			if (typeof v === "object" && v !== null)
				copy[i] = deep_copy(v)
			else
				copy[i] = v
		}
		return copy
	} else {
		let copy = {}
		for (let i in original) {
			let v = original[i]
			if (typeof v === "object" && v !== null)
				copy[i] = deep_copy(v)
			else
				copy[i] = v
		}
		return copy
	}
}

function push_undo() {
	let copy = {}
	for (let k in game) {
		let v = game[k]
		if (k === "undo") continue
		else if (k === "log") v = v.length
		else if (typeof v === "object" && v !== null) v = deep_copy(v)
		copy[k] = v
	}
	game.undo.push(copy)
}

function pop_undo() {
	let save_log = game.log
	let save_undo = game.undo
	game = save_undo.pop()
	save_log.length = game.log
	game.log = save_log
	game.undo = save_undo
}

function clear_undo() {
	game.undo = []
}

function gen_action(action, argument=undefined) {
	if (argument !== undefined) {
		if (!(action in view.actions)) {
			view.actions[action] = [ argument ]
		} else {
			if (!view.actions[action].includes(argument))
				view.actions[action].push(argument)
		}
	} else {
		view.actions[action] = 1
	}
}

// STATE QUERIES

function active_has_court_card(c) {
	let court = player.court
	for (let i = 0; i < court.length; ++i)
		if (court[i] === c)
			return true
	return false
}

function player_has_court_card(p, c) {
	let court = game.players[p].court
	for (let i = 0; i < court.length; ++i)
		if (court[i] === c)
			return true
	return false
}

function which_player_has_court_card(c) {
	for (let p = 0; p < game.players.length; ++p) {
		let court = game.players[p].court
		for (let i = 0; i < court.length; ++i)
			if (court[i] === c)
				return p
	}
	return -1
}

function active_has_russian_influence() { return active_has_court_card(70) }
function active_has_persian_influence() { return active_has_court_card(68) }
function active_has_herat_influence() { return active_has_court_card(66) }
function active_has_claim_of_ancient_lineage() { return active_has_court_card(5) }
function active_has_indian_supplies() { return active_has_court_card(51) }
function active_has_well_connected() { return active_has_court_card(56) }
function active_has_strange_bedfellows() { return active_has_court_card(21) }
function active_has_infrastructure() { return active_has_court_card(78) }
function active_has_civil_service_reforms() { return active_has_court_card(24) }
function active_has_charismatic_courtiers() { return active_has_court_card(42) }
function active_has_blackmail_kandahar() { return active_has_court_card(43) }
function active_has_blackmail_herat() { return active_has_court_card(54) }

function player_has_bodyguards(p) { return player_has_court_card(p, 15) || player_has_court_card(p, 83) }
function player_has_indispensable_advisors(p) { return player_has_court_card(p, 1) }
function player_has_citadel_in_kabul(p) { return player_has_court_card(p, 17) }
function player_has_citadel_in_transcaspia(p) { return player_has_court_card(p, 97) }
function player_has_safe_house(p) { return player_has_court_card(p, 41) || player_has_court_card(p, 72) }

function which_player_has_insurrection() { return which_player_has_court_card(3) }

function player_has_citadel(p, r) {
	if (r === Kabul) return player_has_citadel_in_kabul(p)
	if (r === Transcaspia) return player_has_citadel_in_transcaspia(p)
	return false
}

function player_coalition_blocks(p) {
	switch (game.players[p].loyalty) {
	case Afghan: return 0
	case British: return 12
	case Russian: return 24
	}
}

function active_coalition_blocks() {
	switch (player.loyalty) {
	case Afghan: return 0
	case British: return 12
	case Russian: return 24
	}
}

function player_cylinders(p) {
	return 36 + p * 10
}

function active_cylinders() {
	return 36 + game.active * 10
}

function min_gift_cost() {
	let x = active_cylinders()
	let avail_2 = true, avail_4 = true, avail_6 = true
	for (let i = x; i < x + 10; ++i) {
		let s = game.pieces[i]
		if (s === Gift2) avail_2 = false
		else if (s === Gift4) avail_4 = false
		else if (s === Gift6) avail_6 = false
	}
	if (avail_2) return 2
	if (avail_4) return 4
	if (avail_6) return 6
	return 1000
}

function gen_place_gift() {
	let x = active_cylinders()
	let avail_2 = true, avail_4 = true, avail_6 = true
	for (let i = x; i < x + 10; ++i) {
		let s = game.pieces[i]
		if (s === Gift2) avail_2 = false
		else if (s === Gift4) avail_4 = false
		else if (s === Gift6) avail_6 = false
	}
	if (avail_2 && player.coins >= 2) gen_action('place_gift', 2)
	if (avail_4 && player.coins >= 4) gen_action('place_gift', 4)
	if (avail_6 && player.coins >= 6) gen_action('place_gift', 6)
}

function ruler_of_region(r) {
	let ruler = -1

	let n_afghan = 0
	let n_british = 0
	let n_russian = 0
	for (let i = 0; i < 12; ++i) {
		if (game.pieces[i] === r)
			n_afghan ++
		if (game.pieces[i+12] === r)
			n_british ++
		if (game.pieces[i+24] === r)
			n_russian ++
	}

	let max_ruling = Math.max(n_afghan, n_british, n_russian)

	for (let p = 0; p < game.players.length; ++p) {
		let n_tribes = 0
		let x = player_cylinders(p)
		for (let i = x; i < x + 10; ++i)
			if (game.pieces[i] === r)
				n_tribes++

		let n_ruling = n_tribes
		if (game.players[p].loyalty === Afghan)
			n_ruling += n_afghan
		if (game.players[p].loyalty === British)
			n_ruling += n_british
		if (game.players[p].loyalty === Russian)
			n_ruling += n_russian

		if (n_ruling === max_ruling) {
			ruler = -1
		} else if (n_ruling > max_ruling) {
			max_ruling = n_ruling
			if (n_tribes > 0)
				ruler = p
			else
				ruler = -1
		}
	}

	return ruler
}

function player_rules_region(p, r) {
	return ruler_of_region(r) === p
}

function active_rules_region(r) {
	return player_rules_region(game.active, r)
}

function player_rules_any_region(p) {
	for (let r = first_region; r <= last_region; ++r)
		if (player_rules_region(p, r))
			return true
	return false
}

function active_rules_any_region() {
	return player_rules_any_region(game.active)
}

function active_can_betray() {
	let x = active_cylinders()
	for (let i = x; i < x + 10; ++i) {
		if (game.pieces[i] >= 1 && game.pieces[i] <= 100) {
			let c = game.pieces[i]
			if (cards[c].suit !== Political)
				return true
			let p = find_card_in_court(c)
			if (!player_has_bodyguards(p))
				return true
		}
	}
	return false
}

function card_has_no_spies(c) {
	for (let p = 0; p < game.players.length; ++p) {
		let x = player_cylinders(p)
		for (let i = x; i < x + 10; ++i)
			if (game.pieces[i] === c)
				return false
	}
	return true
}

function market_cost(col, c) {
	if (col === 0)
		return 0
	if (cards[c].patriot === Russian && active_has_russian_influence())
		return 0
	if (cards[c].region === Persia && active_has_persian_influence())
		return 0
	if (cards[c].region === Herat && active_has_herat_influence())
		return 0
	if (game.favored === Military)
		return 2 * col
	return col
}

function is_favored_suit(c) {
	if (cards[c].suit === game.favored)
		return true
	if (player.events.new_tactics && cards[c].suit === Military)
		return true
	if (c === 91) return true // Savvy Operator
	if (c === 99) return true // Irregulars
	return false
}

function rightmost_card(row, i) {
	while (i >= 0 && game.market_cards[row][i] === 0)
		--i
	return i
}

function pay_action_cost(cost, offset) {
	player.coins -= cost
	let ra = rightmost_card(0, 5)
	let rb = rightmost_card(1, 5)

	for (let i = 0; i < offset; ++i) {
		ra = rightmost_card(0, ra-1)
		rb = rightmost_card(1, rb-1)
	}

	for (let i = 0; i < cost; i += 2) {
		if (ra >= 0) {
			mark_card_used(game.market_cards[0][ra])
			game.market_coins[0][ra] ++
		}
		if (rb >= 0) {
			mark_card_used(game.market_cards[1][rb])
			game.market_coins[1][rb] ++
		}
		ra = rightmost_card(0, ra-1)
		rb = rightmost_card(1, rb-1)
	}
	check_public_withdrawal()
}

function remove_all_tribes_and_armies(where) {
	logi(`Removed all tribes and armies in ${region_names[where]}.`)

	for (let i = 0; i < 36; ++i)
		if (game.pieces[i] === where)
			game.pieces[i] = 0

	for (let p = 0; p < game.players.length; ++p) {
		let x = player_cylinders(p)
		let maybe_overthrow = false
		for (let i = x; i < x + 10; ++i) {
			if (game.pieces[i] === where) {
				game.pieces[i] = 0
				maybe_overthrow = true
			}
		}
		if (maybe_overthrow)
			check_region_overthrow(p, where)
	}
}

function player_with_most_spies(c) {
	let who = -1
	let max_spies = 0
	for (let p = 0; p < game.players.length; ++p) {
		let n_spies = count_player_cylinders(p, c)
		if (n_spies === max_spies) {
			who = -1
		} else if (n_spies > max_spies) {
			max_spies = n_spies
			who = p
		}
	}
	return who
}

function select_available_cylinder() {
	let x = active_cylinders()
	for (let i = x; i < x + 10; ++i)
		if (game.pieces[i] === 0)
			return i
	return -1
}

function gen_select_cylinder() {
	let x = active_cylinders()
	for (let i = x; i < x + 10; ++i)
		if (!game.used_pieces.includes(i))
			gen_action('piece', i)
}

function gen_select_spy_to_move() {
	let x = active_cylinders()
	for (let i = x; i < x + 10; ++i)
		if (game.pieces[i] > 0 && game.pieces[i] <= 100)
			gen_action('piece', i)
}

function gen_select_tribe_to_move() {
	let x = active_cylinders()
	for (let i = x; i < x + 10; ++i)
		if (game.pieces[i] >= first_region && game.pieces[i] <= last_region)
			gen_action('piece', i)
}

function select_available_block() {
	let b = active_coalition_blocks()
	for (let i = b + 11; i >= b; --i)
		if (game.pieces[i] === 0)
			return i
	return -1
}

function select_afghan_block() {
	for (let i = 0; i < 12; ++i)
		if (game.pieces[i] === 0)
			return i
	return -1
}

function gen_select_block() {
	let b = active_coalition_blocks()
	for (let i = b; i < b + 12; ++i)
		if (!game.used_pieces.includes(i))
			gen_action('piece', i)
}

function gen_select_army_to_move() {
	let b = active_coalition_blocks()
	for (let i = b; i < b + 12; ++i) {
		let r = game.pieces[i]
		if (r >= first_region && r <= last_region)
			if (active_can_move_from_region(r))
				gen_action('piece', i)
	}
}

// DISCARD COURT CARD

function discard_court_card(c) {
	let pidx = -1

	// Remove card from court
	for (let p = 0; p < game.players.length; ++p) {
		let i = game.players[p].court.indexOf(c)
		if (i >= 0) {
			game.players[p].court.splice(i, 1)
			pidx = p
			break
		}
	}

	if (pidx !== game.phasing)
		log(`Discarded #${c} from ${player_names[pidx]} court.`)
	else
		log(`Discarded #${c} from court.`)

	// Return all spies on card
	for (let p = 0; p < game.players.length; ++p) {
		let x = player_cylinders(p)
		for (let i = x; i < x + 10; ++i) {
			if (game.pieces[i] === c) {
				log(`Returned ${player_names[p]} spy.`)
				game.pieces[i] = 0
			}
		}
	}

	// Return rupees for leverage
	if (cards[c].leveraged) {
		if (pidx !== game.phasing)
			log(`${player_names[pidx]} paid back leverage.`)
		else
			log(`Paid back leverage.`)

		game.players[pidx].coins -= 2
	}

	if (cards[c].suit === Political)
		check_court_overthrow(pidx, cards[c].region)
}

// CHANGE LOYALTY

function change_loyalty(new_loyalty) {
	player.loyalty = new_loyalty

	log(`Loyalty to ${player.loyalty}.`)

	for (let i = 0; i < player.court.length;) {
		let c = player.court[i]
		let card = cards[c]
		if (card.patriot && card.patriot !== new_loyalty) {
			discard_court_card(c)
		} else {
			++i
		}
	}

	let x = active_cylinders()
	for (let i = x; i < x + 10; ++i) {
		let s = game.pieces[i]
		if (s === Gift2 || s === Gift4 || s === Gift6)
			game.pieces[i] = 0
	}

	player.prizes = 0
}

// RETURN LEVERAGE

function check_leverage() {
	let first = game.phasing
	for (let p = first; p < game.players.length; ++p)
		if (check_player_leverage(p))
			return
	for (let p = 0; p < first; ++p)
		if (check_player_leverage(p))
			return
	check_safe_house()
}

function check_player_leverage(p) {
	if (game.players[p].coins < 0) {
		if (game.players[p].hand.length + game.players[p].court.length === 0) {
			game.players[p].coins = 0
		} else {
			logbr()
			set_active(p)
			game.state = 'leverage'
			return true
		}
	}
	return false
}

states.leverage = {
	prompt() {
		if (player.coins < 0) {
			view.prompt = `Discard cards from your hand or court to pay back leverage.`
			for (let i = 0; i < player.hand.length; ++i)
				gen_action('card', player.hand[i])
			for (let i = 0; i < player.court.length; ++i)
				gen_action('card', player.court[i])
		} else {
			view.prompt = `Discard cards from your hand or court to pay back leverage \u2014 done.`
			gen_action('next')
		}
	},
	card(c) {
		push_undo()
		player.coins ++
		if (player.hand.includes(c)) {
			log(`Discarded #${c} from hand.`)
			remove_from_array(player.hand, c)
		} else {
			discard_court_card(c)
		}
		if (player.hand.length + player.court.length === 0)
			player.coins = 0
	},
	next() {
		push_undo()
		check_leverage()
	}
}

// OVERTHROW

function check_court_overthrow(p, r) {
	let court = game.players[p].court
	let x = player_cylinders(p)

	let nc = 0
	for (let i = 0; i < court.length; ++i) {
		let info = cards[court[i]]
		if (info.suit === Political && info.region === r)
			++nc
	}

	let nt = 0
	for (let i = x; i < x + 10; ++i)
		if (game.pieces[i] === r)
			++nt

	if (nc === 0 && nt > 0) {
		log(`${player_names[p]} overthrown in ${region_names[r]}.`)
		for (let i = x; i < x + 10; ++i) {
			if (game.pieces[i] === r) {
				// log(`Removed ${player_names[p]} tribe.`)
				game.pieces[i] = 0
			}
		}
	}
}

function check_region_overthrow(p, r) {
	let court = game.players[p].court
	let x = player_cylinders(p)

	let nc = 0
	for (let i = 0; i < court.length; ++i) {
		let info = cards[court[i]]
		if (info.suit === Political && info.region === r)
			++nc
	}

	let nt = 0
	for (let i = x; i < x + 10; ++i)
		if (game.pieces[i] === r)
			++nt

	if (nt === 0 && nc > 0) {
		log(`${player_names[p]} overthrown in ${region_names[r]}.`)
		for (let i = 0; i < court.length;) {
			let info = cards[court[i]]
			if (info.suit === Political && info.region === r)
				discard_court_card(court[i])
			else
				++i
		}
	}
}

// BRIBES

states.bribe = {
	prompt() {
		let p = game.bribe
		view.prompt = `Must pay ${game.count} rupee bribe to ${player_names[p]}.`
		if (player.coins - game.reserve >= game.count)
			gen_action('pay')
		gen_action('beg')
		if (player.events.courtly_manners)
			gen_action('courtly_manners')
		if (game.undo.length === 0)
			gen_action('cancel')
	},
	courtly_manners() {
		log(`Did not pay bribe.`)
		end_bribe()
	},
	pay() {
		let p = game.bribe
		log(`Paid ${game.count} to ${player_names[p]}.`)
		game.players[p].coins += game.count
		game.players[game.active].coins -= game.count
		end_bribe()
	},
	beg() {
		let p = game.bribe
		if (typeof game.where === 'string')
			log(`Asked ${player_names[p]} to waive the bribe to use #${game.card} to ${game.where}.`)
		else
			log(`Asked ${player_names[p]} to waive the bribe to play #${game.card}.`)
		game.state = 'waive'
		set_active(p)
	},
	refuse() {
		// for old replays
		states.bribe.cancel()
	},
	cancel() {
		game.card = 0
		game.where = 0
		resume_actions()
	},
}

states.waive = {
	prompt() {
		if (typeof game.where === 'string')
			view.prompt = `${player_names[game.phasing]} asks you to waive the bribe to use #${game.card} to ${game.where}.`
		else
			view.prompt = `${player_names[game.phasing]} asks you to waive the bribe to play #${game.card}.`
		let max_cost = Math.min(game.players[game.phasing].coins - game.reserve, game.count)
		gen_action('waive')
		for (let i = 1; i <= max_cost; ++i)
			gen_action('offer_' + i)
		gen_action('refuse')
	},
	waive() {
		log(`${player_names[game.active]} waived the bribe.`)
		set_active(game.phasing)
		end_bribe()
	},
	offer_1() { do_offer(1) },
	offer_2() { do_offer(2) },
	offer_3() { do_offer(3) },
	offer_4() { do_offer(4) },
	offer_5() { do_offer(5) },
	offer_6() { do_offer(6) },
	offer_7() { do_offer(7) },
	offer_8() { do_offer(8) },
	offer_9() { do_offer(9) },
	refuse() {
		log(`${player_names[game.active]} refused to waive the bribe.`)
		game.state = 'bribe'
		set_active(game.phasing)
	},
}

function do_offer(n) {
	log(`${player_names[game.active]} reduced the bribe to ${n}.`)
	game.count = 1
	game.state = 'bribe'
	set_active(game.phasing)
}

function end_bribe() {
	if (typeof game.where === 'string')
		do_card_action_2()
	else
		do_play_2()
}

// STARTING LOYALTY

states.loyalty = {
	prompt() {
		view.prompt = `Choose your loyalty \u2014 Afghan, British, or Russian.`
		gen_action('loyalty_afghan')
		gen_action('loyalty_british')
		gen_action('loyalty_russian')
	},
	loyalty_afghan() {
		set_starting_loyalty(Afghan)
	},
	loyalty_british() {
		set_starting_loyalty(British)
	},
	loyalty_russian() {
		set_starting_loyalty(Russian)
	},
}

function set_starting_loyalty(loyalty) {
	log(`${player_names[game.active]} loyalty to ${loyalty}.`)
	player.loyalty = loyalty
	let next = next_player(game.active)
	if (game.players[next].loyalty)
		goto_actions()
	else
		set_active(next)
}

// ACTION PHASE

function goto_actions() {
	game.phasing = game.active
	game.actions = 2
	game.used_cards = [] // track cards that have been used
	game.used_pieces = []
	game.selected = -1
	game.where = 0
	logbr()
	log(`.turn ${player_names[game.phasing]}`)
	logbr()

	let bmh = active_can_blackmail(Herat)
	let bmk = active_can_blackmail(Kandahar)
	if (bmh || bmk) {
		game.state = 'blackmail'
		game.where = (bmh && bmk) ? -1 : (bmh ? Herat : Kandahar)
		game.selected = select_available_cylinder()
	} else {
		resume_actions()
	}
}

function end_action() {
	check_leverage()
}

function resume_actions() {
	set_active(game.phasing)
	game.selected = -1
	game.where = 0
	game.state = 'actions'
}

function goto_next_player() {
	game.phasing = next_player(game.phasing)
	set_active(game.phasing)
	goto_actions()
}

function mark_card_used(c) {
	if (!game.used_cards.includes(c))
		game.used_cards.push(c)
}

states.actions = {
	prompt() {
		// Pass / End turn
		if (game.actions > 0) {
			gen_action('end_turn_pass')
		} else {
			gen_action('end_turn')
		}

		// Purchase
		if (game.actions > 0) {
			for (let row = 0; row < 2; ++row) {
				for (let col = 0; col < 6; ++col) {
					let c = game.market_cards[row][col]
					if (c && market_cost(col, c) <= player.coins && !game.used_cards.includes(c) && c !== PUBLIC_WITHDRAWAL)
						gen_action('card', c)
				}
			}
		}

		// Play
		if (game.actions > 0) {
			for (let i = 0; i < player.hand.length; ++i) {
				let c = player.hand[i]
				gen_action('play_left', c)
				gen_action('play_right', c)
			}
		}

		// Card-based actions
		let bonus = false
		for (let i = 0; i < player.court.length; ++i) {
			let c = player.court[i]
			let card = cards[c]

			if (game.used_cards.includes(c))
				continue

			let favored = is_favored_suit(c)
			if (favored || game.actions > 0) {
				let usable = false

				if (card.tax && active_can_tax()) {
					gen_action('tax', c)
					usable = true
				}
				if (card.gift && player.coins >= min_gift_cost()) {
					gen_action('gift', c)
					usable = true
				}
				if (card.build && player.coins >= 2 && active_rules_any_region()) {
					gen_action('build', c)
					usable = true
				}
				if (card.move && active_can_move()) {
					gen_action('move', c)
					usable = true
				}
				if (card.betray && player.coins >= 2 && active_can_betray()) {
					gen_action('betray', c)
					usable = true
				}
				if (card.battle && active_can_battle()) {
					gen_action('battle', c)
					usable = true
				}

				if (usable && favored)
					bonus = true
			}
		}

		if (game.actions === 2)
			view.prompt = `You may take two actions.`
		else if (game.actions === 1)
			view.prompt = `You may take one more action.`
		else
			view.prompt = `You have no more actions.`
		if (bonus)
			view.prompt += ` You may take bonus actions.`

	},

	// Purchase card from market
	card(c) {
		push_undo()
		logbr()

		let [row, col] = find_card_in_market(c)
		game.actions --

		let cost = market_cost(col, c)
		let cost_per_card = cost / col
		if (cost_per_card > 0) {
			for (let i = 0; i < col; ++i) {
				if (game.market_cards[row][i] > 0) {
					game.market_coins[row][i] += cost_per_card
					mark_card_used(game.market_cards[row][i])
				} else {
					game.market_coins[1-row][i] += cost_per_card
					mark_card_used(game.market_cards[1-row][i])
				}
			}
		}
		check_public_withdrawal()

		logbr()

		if (cost > 0)
			player.coins -= cost

		let took = game.market_coins[row][col]
		if (took > 0)
			player.coins += took

		game.market_coins[row][col] = 0
		game.market_cards[row][col] = 0

		log(`Purchased #${c}.`)
		if (cost > 0 && took > 0)
			logi(`Paid ${cost} and took ${took}.`)
		else if (cost > 0)
			logi(`Paid ${cost}.`)
		else if (took > 0)
			logi(`Took ${took}.`)

		if (is_dominance_check(c)) {
			do_dominance_check('purchase')
		} else if (is_event_card(c)) {
			events_if_purchased[cards[c].if_purchased]()
		} else {
			player.hand.push(c)
			resume_actions()
		}
	},

	// Play card to court
	play_left(c) { do_play_1(c, 0) },
	play_right(c) { do_play_1(c, 1) },

	// Use card based ability
	tax(c) { do_card_action_1(c, "Tax", 0) },
	gift(c) { do_card_action_1(c, "Gift", min_gift_cost()) },
	build(c) { do_card_action_1(c, "Build", 2) },
	move(c) { do_card_action_1(c, "Move", 0) },
	betray(c) { do_card_action_1(c, "Betray", 2) },
	battle(c) { do_card_action_1(c, "Battle", 0) },

	end_turn_pass() {
		logbr()
		log(`Passed.`)
		goto_cleanup_court()
	},
	end_turn() {
		goto_cleanup_court()
	},
}

// PLAY CARD

function do_play_1(c, side) {
	push_undo()
	game.card = c
	game.where = side
	if (!active_has_charismatic_courtiers() && !game.events.disregard_for_customs) {
		let ruler = ruler_of_region(cards[c].region)
		if (ruler >= 0 && ruler !== game.active) {
			logbr()
			game.state = 'bribe'
			game.count = count_player_cylinders(ruler, cards[c].region)
			game.reserve = 0
			game.bribe = ruler
			return
		}
	}
	do_play_2()
}

function do_play_2() {
	let c = game.card
	let side = game.where
	game.actions --
	logbr()
	log(`Played #${c}.`)
	let idx = player.hand.indexOf(c)
	player.hand.splice(idx, 1)
	if (side)
		player.court.push(c)
	else
		player.court.unshift(c)
	goto_play_patriot()
}

function goto_play_patriot() {
	let card = cards[game.card]
	if (card.patriot && card.patriot !== player.loyalty)
		change_loyalty(card.patriot)
	goto_play_tribes()
}

function goto_play_tribes() {
	let card = cards[game.card]
	if (card.tribes) {
		game.count = card.tribes
		game.state = 'place_tribe'
		game.where = card.region
		game.selected = select_available_cylinder()
	} else {
		goto_play_roads()
	}
}

states.place_tribe = {
	inactive: "place tribe",
	prompt() {
		if (game.selected < 0) {
			view.prompt = `Place tribe in ${region_names[game.where]} \u2014 select a cylinder.`
			gen_select_cylinder()
		} else {
			view.prompt = `Place tribe in ${region_names[game.where]}.`
			gen_action('space', game.where)
		}
	},
	piece(x) {
		push_undo()
		game.selected = x
	},
	space(s) {
		push_undo()
		logi(`Tribe to ${region_names[s]}.`)
		game.pieces[game.selected] = s
		game.used_pieces.push(game.selected)
		game.selected = -1
		if (--game.count === 0)
			goto_play_roads()
		else
			game.selected = select_available_cylinder()
	},
}

function goto_play_roads() {
	let card = cards[game.card]
	if (card.roads) {
		game.count = card.roads
		game.state = 'place_road'
		game.where = card.region
		game.selected = select_available_block()
	} else {
		goto_play_armies()
	}
}

states.place_road = {
	inactive: "place road",
	prompt() {
		if (game.selected < 0) {
			view.prompt = `Place ${player.loyalty} road in ${region_names[game.where]} \u2014 select a block to move.`
			gen_select_block()
		} else {
			view.prompt = `Place ${player.loyalty} road in ${region_names[game.where]}.`
			for (let s of borders[game.where])
				gen_action('space', s)
		}
	},
	piece(x) {
		push_undo()
		game.selected = x
	},
	space(s) {
		push_undo()
		logi(`${player.loyalty} road to ${border_names[s]}.`)
		game.pieces[game.selected] = s
		game.used_pieces.push(game.selected)
		game.selected = -1
		if (--game.count === 0)
			goto_play_armies()
		else
			game.selected = select_available_block()
	},
}

function goto_play_armies() {
	let card = cards[game.card]
	if (card.armies) {
		game.count = card.armies
		game.state = 'place_army'
		game.where = card.region
		game.selected = select_available_block()
	} else {
		goto_play_spies()
	}
}

states.place_army = {
	inactive: "place army",
	prompt() {
		if (game.selected < 0) {
			view.prompt = `Place ${player.loyalty} army in ${region_names[game.where]} \u2014 select a block to move.`
			gen_select_block()
		} else {
			view.prompt = `Place ${player.loyalty} army in ${region_names[game.where]}.`
			gen_action('space', game.where)
		}
	},
	piece(x) {
		push_undo()
		game.selected = x
	},
	space(s) {
		push_undo()
		logi(`${player.loyalty} army to ${region_names[s]}.`)
		game.pieces[game.selected] = s
		game.used_pieces.push(game.selected)
		game.selected = -1
		if (--game.count === 0)
			goto_play_spies()
		else
			game.selected = select_available_block()
	},
}

function goto_play_spies() {
	let card = cards[game.card]
	if (card.spies) {
		game.count = card.spies
		game.state = 'place_spy'
		game.where = card.region
		game.selected = select_available_cylinder()
	} else {
		goto_play_leveraged()
	}
}

states.place_spy = {
	inactive: "place spy",
	prompt() {
		if (game.selected < 0) {
			view.prompt = `Place spy on a court card in ${region_names[game.where]} \u2014 select a cylinder.`
			gen_select_cylinder()
		} else {
			view.prompt = `Place spy on a court card in ${region_names[game.where]}.`
			for (let p = 0; p < game.players.length; ++p) {
				let court = game.players[p].court
				for (let i = 0; i < court.length; ++i) {
					let card = cards[court[i]]
					if (card.region === game.where) {
						gen_action('card', court[i])
					}
				}
			}
		}
	},
	piece(x) {
		push_undo()
		game.selected = x
	},
	card(c) {
		push_undo()
		let p = find_card_in_court(c)
		if (p !== game.active)
			logi(`Spy to #${c} in ${player_names[p]} court.`)
		else
			logi(`Spy to #${c}.`)
		game.pieces[game.selected] = c
		game.used_pieces.push(game.selected)
		game.selected = -1
		if (--game.count === 0)
			goto_play_leveraged()
		else
			game.selected = select_available_cylinder()
	},
}

function goto_play_leveraged() {
	let card = cards[game.card]
	if (card.leveraged) {
		logi(`Leveraged.`)
		player.coins += 2
	}
	goto_play_favored_suit_impact()
}

function goto_play_favored_suit_impact() {
	let card = cards[game.card]
	if (card.climate && !game.events.pashtunwali_values) {
		game.state = 'favored_suit_impact'
		game.where = card.climate
	} else {
		end_action()
	}
}

states.favored_suit_impact = {
	inactive: "favored suit",
	prompt() {
		view.prompt = `Change the favored suit to ${game.where}.`
		gen_action('suit', game.where)
	},
	suit(suit) {
		push_undo()
		logi(`Favored suit to ${suit}.`)
		game.favored = suit
		end_action()
	},
}

// CARD-BASED ACTION (COMMON)

const card_action_table = {
	Tax() {
		game.state = 'tax'
	},

	Gift() {
		game.selected = select_available_cylinder()
		game.state = 'gift'
	},

	Build() {
		game.count = Math.min(3, Math.floor(player.coins / 2))
		if (player.events.nation_building)
			game.count *= 2
		game.selected = select_available_block()
		game.reserve = 0
		game.state = 'build'
	},

	Move() {
		game.selected = -1
		game.state = 'move'
	},

	Betray() {
		pay_action_cost(2, 0)
		game.state = 'betray'
	},

	Battle() {
		game.state = 'battle'
		game.where = 0
	},
}

function do_card_action_1(c, what, reserve) {
	push_undo()
	game.card = c
	game.where = what
	if (!active_has_civil_service_reforms() && !game.events.disregard_for_customs) {
		let who = player_with_most_spies(c)
		if (who >= 0 && who !== game.active) {
			logbr()
			game.state = 'bribe'
			game.count = count_player_cylinders(who, c)
			game.reserve = reserve
			game.bribe = who
			return
		}
	}
	do_card_action_2()
}

const past_what = {
	Tax: "Taxed",
	Gift: "Gifted",
	Build: "Built",
	Move: "Moved",
	Betray: "Betrayed",
	Battle: "Battled",
}

function do_card_action_2() {
	let c = game.card
	let what = game.where
	game.used_cards.push(c)
	if (!is_favored_suit(c))
		game.actions --
	game.count = cards[c].rank
	logbr()
	log(`${past_what[what]} with #${c}.`)
	card_action_table[what]()
}

// CARD-BASED ACTION: TAX

function can_tax_player(active, p, claim) {
	let okay = claim
	let shelter = 0
	let court = game.players[p].court
	for (let i = 0; i < court.length; ++i) {
		let c = court[i]
		if (!okay && player_rules_region(active, cards[c].region))
			okay = true
		if (cards[c].suit === Economic)
			shelter += cards[c].rank
	}
	return okay && game.players[p].coins > shelter
}

function do_tax_player(p) {
	push_undo()
	logi(`Taxed ${player_names[p]} player.`)
	game.players[p].coins --
	player.coins ++
	if (--game.count === 0)
		end_action()
}

function active_can_tax() {
	for (let row = 0; row < 2; ++row)
		for (let col = 0; col < 6; ++col)
			if (game.market_coins[row][col] > 0)
				return true
	let claim = active_has_claim_of_ancient_lineage()
	for (let p = 0; p < game.players.length; ++p)
		if (p !== game.active && can_tax_player(game.active, p, claim))
			return true
	return false
}

states.tax = {
	prompt() {
		if (game.count === 1)
			view.prompt = `Tax \u2014 take up to ${game.count} rupee from market cards or players.`
		else
			view.prompt = `Tax \u2014 take up to ${game.count} rupees from market cards or players.`

		for (let row = 0; row < 2; ++row) {
			for (let col = 0; col < 6; ++col) {
				if (game.market_coins[row][col] > 0)
					gen_action('card', game.market_cards[row][col])
			}
		}

		let claim = active_has_claim_of_ancient_lineage()
		for (let p = 0; p < game.players.length; ++p) {
			if (p !== game.active && can_tax_player(game.active, p, claim)) {
				gen_action('player_' + p)
			}
		}

		gen_action('pass')
	},
	pass() {
		push_undo()
		end_action()
	},
	card(c) {
		push_undo()
		let [row, col] = find_card_in_market(c)
		logi(`Taxed market.`)
		game.market_coins[row][col] --
		player.coins ++
		if (--game.count === 0)
			end_action()
	},
	player_0() { do_tax_player(0) },
	player_1() { do_tax_player(1) },
	player_2() { do_tax_player(2) },
	player_3() { do_tax_player(3) },
	player_4() { do_tax_player(4) },
}

// CARD-BASED ACTION: GIFT

states.gift = {
	prompt() {
		if (game.selected < 0) {
			view.prompt = `Select cylinder to place as Gift.`
			gen_select_cylinder()
		} else {
			view.prompt = `Place cylinder as Gift.`
			gen_place_gift()
		}
	},
	piece(x) {
		push_undo()
		game.selected = x
	},
	place_gift(cost) {
		push_undo()
		logi(`Paid ${cost}.`)
		pay_action_cost(cost, 0)
		if (cost === 2)
			game.pieces[game.selected] = Gift2
		else if (cost === 4)
			game.pieces[game.selected] = Gift4
		else if (cost === 6)
			game.pieces[game.selected] = Gift6
		game.used_pieces.push(game.selected)
		game.selected = -1
		end_action()
	}
}

// CARD-BASED ACTION: BUILD

states.build = {
	prompt() {
		view.prompt = `Build up to ${game.count} armies and/or roads.`
		gen_action('next')
		let must_pay = !player.events.nation_building || (game.count & 1) === 0
		if (!must_pay || player.coins >= 2) {
			if (game.selected < 0) {
				gen_select_block()
			} else {
				for (let r = first_region; r <= last_region; ++r) {
					if (active_rules_region(r)) {
						gen_action('space', r)
						for (let s of borders[r])
							gen_action('space', s)
					}
				}
			}
		}
	},
	piece(x) {
		push_undo()
		game.selected = x
	},
	space(s) {
		push_undo()

		let must_pay = !player.events.nation_building || (game.count & 1) === 0
		if (must_pay)
			pay_action_cost(2, game.reserve++)

		if (s <= last_region)
			logi(`${player.loyalty} army to ${region_names[s]}.`)
		else
			logi(`${player.loyalty} road to ${border_names[s]}.`)
		game.pieces[game.selected] = s
		game.used_pieces.push(game.selected)
		game.selected = -1
		--game.count

		must_pay = !player.events.nation_building || (game.count & 1) === 0
		if (game.count === 0 || (must_pay && player.coins < 2))
			end_build_action()
		else
			game.selected = select_available_block()
	},
	next() {
		push_undo()
		end_build_action()
	},
}

states.infrastructure = {
	prompt() {
		view.prompt = `Place an additional block.`
		if (game.selected < 0) {
			gen_select_block()
		} else {
			for (let r = first_region; r <= last_region; ++r) {
				if (active_rules_region(r)) {
					gen_action('space', r)
					for (let s of borders[r])
						gen_action('space', s)
				}
			}
		}
	},
	piece(x) {
		push_undo()
		game.selected = x
	},
	space(s) {
		push_undo()
		if (s <= last_region)
			logi(`${player.loyalty} army to ${region_names[s]}.`)
		else
			logi(`${player.loyalty} road to ${border_names[s]}.`)
		game.pieces[game.selected] = s
		game.used_pieces.push(game.selected)
		game.selected = -1
		end_action()
	},
}

function end_build_action() {
	if (active_has_infrastructure()) {
		game.state = 'infrastructure'
		game.selected = select_available_block()
	} else {
		end_action()
	}
}

// CARD-BASED ACTION: MOVE

function last_court_position() {
	let n = 0
	for (let p = 0; p < game.players.length; ++p)
		n += game.players[p].court.length
	return n - 1
}

function court_card_from_position(y) {
	let x = 0
	for (let p = 0; p < game.players.length; ++p) {
		let court = game.players[p].court
		if (y < x + court.length)
			return court[y - x]
		x += court.length
	}
	return 0
}

function court_position_from_card(c) {
	let x = 0
	for (let p = 0; p < game.players.length; ++p) {
		let court = game.players[p].court
		for (let i = 0; i < court.length; ++i) {
			if (c === court[i])
				return x + i
		}
		x += court.length
	}
	return -1
}

function find_border(a, b) {
	if (a > b) {
		let c = a; a = b; b = c
	}
	if (a === Persia && b === Transcaspia) return Persia_Transcaspia
	if (a === Persia && b === Herat) return Persia_Herat
	if (a === Transcaspia && b === Herat) return Transcaspia_Herat
	if (a === Transcaspia && b === Kabul) return Transcaspia_Kabul
	if (a === Herat && b === Kabul) return Herat_Kabul
	if (a === Herat && b === Kandahar) return Herat_Kandahar
	if (a === Kabul && b === Kandahar) return Kabul_Kandahar
	if (a === Kabul && b === Punjab) return Kabul_Punjab
	if (a === Kandahar && b === Punjab) return Kandahar_Punjab
	throw new Error(`bad border ${a} ${b}`)
}

function can_army_move_across_border(here, next) {
	let border = find_border(here, next)
	let b = active_coalition_blocks()
	for (let i = b; i < b + 12; ++i)
		if (game.pieces[i] === border)
			return true
	return false
}

function active_can_move_from_region(here) {
	let supplies = active_has_indian_supplies()
	for (let next of roads[here])
		if (supplies || can_army_move_across_border(here, next))
			return true
	return false
}

function active_can_move() {
	let b = active_coalition_blocks()
	let x = active_cylinders()

	for (let i = b; i < b + 12; ++i) {
		let r = game.pieces[i]
		if (r >= first_region && r <= last_region)
			if (active_can_move_from_region(r))
				return true
	}

	for (let i = x; i < x + 10; ++i) {
		let r = game.pieces[i]
		if (r > 0 && r <= 100)
			return true
	}

	if (player.events.nationalism) {
		for (let i = x; i < x + 10; ++i) {
			let r = game.pieces[i]
			if (r >= first_region && r <= last_region)
				if (active_can_move_from_region(r))
					return true
		}
	}

	return false
}

states.move = {
	prompt() {
		if (game.selected >= 0) {
			let here = game.pieces[game.selected]

			// Spy on a court card
			if (here <= 100) {
				let c = here
				here = court_position_from_card(here)
				view.prompt = `Move spy from #${c}.`

				let last = last_court_position()
				let prev = here > 0 ? here - 1 : last
				let next = here < last ? here + 1 : 0
				gen_action('card', court_card_from_position(prev))
				gen_action('card', court_card_from_position(next))

				if (active_has_well_connected()) {
					let pprev = prev > 0 ? prev - 1 : last
					let nnext = next < last ? next + 1 : 0
					gen_action('card', court_card_from_position(pprev))
					gen_action('card', court_card_from_position(nnext))
				}

				if (active_has_strange_bedfellows()) {
					let r = cards[c].region
					for (let p = 0; p < game.players.length; ++p) {
						let court = game.players[p].court
						for (let i = 0; i < court.length; ++i)
							if (cards[court[i]].region === r)
								gen_action('card', court[i])
					}
				}
			}

			// Army or tribe in a region
			else {
				if (game.selected < 36)
					view.prompt = `Move ${player.loyalty} army from ${region_names[here]}.`
				else
					view.prompt = `Move ${player_names[game.active]} tribe from ${region_names[here]}.`
				let supplies = active_has_indian_supplies()
				for (let next of roads[here])
					if (supplies || can_army_move_across_border(here, next))
						gen_action('space', next)
			}
		} else {
			if (player.events.nationalism) {
				if (game.count === 1)
					view.prompt = `Move up to ${game.count} spy, army, or tribe \u2014 select a spy, army, or tribe to move.`
				else
					view.prompt = `Move up to ${game.count} spies, armies, and/or tribes \u2014 select a spy, army, or tribe to move.`
			} else {
				if (game.count === 1)
					view.prompt = `Move up to ${game.count} spy or army \u2014 select a spy or army to move.`
				else
					view.prompt = `Move up to ${game.count} spies and/or armies \u2014 select a spy or army to move.`
			}
			gen_action('next')
			gen_select_army_to_move()
			gen_select_spy_to_move()
			if (player.events.nationalism)
				gen_select_tribe_to_move()
		}
	},
	piece(x) {
		push_undo()
		game.selected = x
	},
	card(c) {
		push_undo()
		let old = game.pieces[game.selected]
		let pold = find_card_in_court(old)
		let p = find_card_in_court(c)
		if (pold !== p)
			logi(`Spy from #${old} in ${player_names[pold]} court to #${c} in ${player_names[p]} court.`)
		else
			logi(`Spy from #${old} to #${c} in ${player_names[p]} court.`)
		game.pieces[game.selected] = c
		game.selected = -1
		if (--game.count === 0)
			end_action()
	},
	space(s) {
		push_undo()
		let old = game.pieces[game.selected]
		game.pieces[game.selected] = s
		if (game.selected < 36) {
			logi(`${player.loyalty} army from ${region_names[old]} to ${region_names[s]}.`)
		} else {
			logi(`Tribe from ${region_names[old]} to ${region_names[s]}.`)
			check_region_overthrow(game.active, old)
		}
		game.selected = -1
		if (--game.count === 0)
			end_action()
	},
	next() {
		push_undo()
		end_action()
	},
}

// CARD-BASED ACTION: BETRAY

states.betray = {
	prompt() {
		view.prompt = `Discard one court card where you have a spy.`
		let x = active_cylinders()
		for (let i = x; i < x + 10; ++i) {
			if (game.pieces[i] > 0 && game.pieces[i] <= 100) {
				let c = game.pieces[i]
				if (cards[c].suit !== Political) {
					gen_action('card', c)
				} else {
					let p = find_card_in_court(c)
					if (!player_has_bodyguards(p))
						gen_action('card', c)
				}
			}
		}
	},
	card(c) {
		push_undo()
		discard_court_card(c)
		if (cards[c].prize) {
			game.card = c
			game.state = 'accept_prize'
		} else {
			end_action()
		}
	},
}

states.accept_prize = {
	inactive: "accept prize",
	prompt() {
		view.prompt = `You may accept #${game.card} as ${a_coalition(cards[game.card].prize)} prize.`
		gen_action('accept')
		gen_action('refuse')
	},
	accept() {
		log(`Accepted ${cards[game.card].prize} prize.`)
		if (cards[game.card].prize !== player.loyalty)
			change_loyalty(cards[game.card].prize)
		player.prizes ++
		end_action()
	},
	refuse() {
		end_action()
	},
}

// CARD-BASED ACTION: BATTLE

function gen_battle_blocks(where) {
	if (player.loyalty !== Afghan)
		for (let i = 0; i < 12; ++i)
			if (game.pieces[i] === where)
				gen_action('piece', i)
	if (player.loyalty !== British)
		for (let i = 12; i < 24; ++i)
			if (game.pieces[i] === where)
				gen_action('piece', i)
	if (player.loyalty !== Russian)
		for (let i = 24; i < 36; ++i)
			if (game.pieces[i] === where)
				gen_action('piece', i)
}

function count_active_spies_on_card(where) {
	let n = 0
	let x = active_cylinders()
	for (let i = x; i < x + 10; ++i)
		if (game.pieces[i] === where)
			++n
	return n
}

function count_enemy_spies_on_card(where) {
	let n = 0
	for (let p = 0; p < game.players.length; ++p) {
		if (p === game.active)
			continue
		if (player_has_indispensable_advisors(p))
			continue
		let x = player_cylinders(p)
		for (let i = x; i < x + 10; ++i) {
			if (game.pieces[i] === where)
				++n
		}
	}
	return n
}

function count_player_armies_in_region(p, where) {
	let n = 0
	let b = player_coalition_blocks(p)
	for (let i = b; i < b + 12; ++i)
		if (game.pieces[i] === where)
			++n
	return n
}

function count_player_cylinders(p, r) {
	let x = player_cylinders(p)
	let n = 0
	for (let i = x; i < x + 10; ++i)
		if (game.pieces[i] === r)
			++n
	return n
}

function count_active_armies_in_region(where) {
	let n = count_player_armies_in_region(game.active, where)
	if (player.events.nationalism)
		n += count_player_cylinders(game.active, where)
	return n
}

function count_enemy_blocks_on_border(where) {
	let n = 0
	if (player.loyalty !== Afghan)
		for (let i = 0; i < 12; ++i)
			if (game.pieces[i] === where)
				++n
	if (player.loyalty !== British)
		for (let i = 12; i < 24; ++i)
			if (game.pieces[i] === where)
				++n
	if (player.loyalty !== Russian)
		for (let i = 24; i < 36; ++i)
			if (game.pieces[i] === where)
				++n
	return n
}

function count_enemy_tribes_and_blocks_in_region(where) {
	let n = 0
	for (let p = 0; p < game.players.length; ++p) {
		if (game.players[p].loyalty === player.loyalty)
			continue
		if (player_has_citadel(p, where))
			continue
		let x = player_cylinders(p)
		for (let i = x; i < x + 10; ++i)
			if (game.pieces[i] === where)
				++n
	}
	if (player.loyalty !== Afghan)
		for (let i = 0; i < 12; ++i)
			if (game.pieces[i] === where)
				++n
	if (player.loyalty !== British)
		for (let i = 12; i < 24; ++i)
			if (game.pieces[i] === where)
				++n
	if (player.loyalty !== Russian)
		for (let i = 24; i < 36; ++i)
			if (game.pieces[i] === where)
				++n
	for (let b of borders[where])
		n += count_enemy_blocks_on_border(b)
	return n
}

function is_battle_card(where) {
	return count_active_spies_on_card(where) > 0 && count_enemy_spies_on_card(where) > 0
}

function is_battle_region(where) {
	return count_active_armies_in_region(where) > 0 && count_enemy_tribes_and_blocks_in_region(where) > 0
}

function piece_owner(x) {
	if (x < 12) return "Afghan"
	if (x < 24) return "British"
	if (x < 36) return "Russian"
	if (x < 36+10) return player_names[0]
	if (x < 36+20) return player_names[1]
	if (x < 36+30) return player_names[2]
	if (x < 36+40) return player_names[3]
	if (x < 36+50) return player_names[4]
	return "undefined"
}

function active_can_battle() {
	for (let r = first_region; r <= last_region; ++r) {
		if (is_battle_region(r))
			return true
	}
	for (let p = 0; p < game.players.length; ++p) {
		let court = game.players[p].court
		for (let i = 0; i < court.length; ++i)
			if (is_battle_card(court[i]))
				return true
	}
	return false
}

function is_safe_house_in_play() {
	for (let x = 36; x < game.pieces.length; ++x)
		if (game.pieces[x] === Safe_House)
			return true
	return false
}

states.battle = {
	prompt() {
		if (game.where <= 0) {
			view.prompt = `Start a battle in a single region or on a court card.`
			for (let p = 0; p < game.players.length; ++p) {
				let court = game.players[p].court
				for (let i = 0; i < court.length; ++i) {
					if (is_battle_card(court[i]))
						gen_action('card', court[i])
				}
			}
			for (let r = first_region; r <= last_region; ++r) {
				if (is_battle_region(r))
					gen_action('space', r)
			}
		} else {
			let where = game.where
			if (where >= first_region && where <= last_region) {
				view.prompt = `Remove up to ${game.count} tribes, roads, or armies from ${region_names[where]}.`
				gen_battle_blocks(where)
				for (let border of borders[where])
					gen_battle_blocks(border)
				for (let p = 0; p < game.players.length; ++p) {
					if (p !== game.active && game.players[p].loyalty !== player.loyalty && !player_has_citadel(p, where)) {
						let x = player_cylinders(p)
						for (let i = x; i < x + 10; ++i)
							if (game.pieces[i] === where)
								gen_action('piece', i)
					}
				}
			} else {
				if (game.count > 0) {
					view.prompt = `Remove up to ${game.count} spies on #${where}.`
					for (let p = 0; p < game.players.length; ++p) {
						if (p !== game.active && !player_has_indispensable_advisors(p)) {
							let x = player_cylinders(p)
							for (let i = x; i < x + 10; ++i)
								if (game.pieces[i] === where)
									gen_action('piece', i)
						}
					}
				} else {
					view.prompt = `Battle on #${game.where} is over \u2014 undo will not be possible.`
				}
			}
			gen_action('next')
		}
	},
	card(where) {
		push_undo()
		//logi(`Battle on #${where}.`)
		game.where = where
		game.count = Math.min(game.count, count_active_spies_on_card(where))
	},
	space(s) {
		push_undo()
		//logi(`Battle in ${region_names[s]}.`)
		game.where = s
		game.count = Math.min(game.count, count_active_armies_in_region(s))
	},
	piece(x) {
		push_undo()
		let where = game.pieces[x]
		game.pieces[x] = 0
		if (x < 36) {
			if (where >= first_region && where <= last_region)
				logi(`Removed ${piece_owner(x)} army from ${region_names[where]}.`)
			else
				logi(`Removed ${piece_owner(x)} road from ${border_names[where]}.`)
		} else {
			let p = Math.floor((x - 36) / 10)
			if (where <= 100) {
				let pp = find_card_in_court(where)
				logi(`Removed ${piece_owner(x)} spy from #${where} in ${player_names[pp]} court.`)
				if (player_has_safe_house(p))
					game.pieces[x] = Safe_House
			} else {
				logi(`Removed ${piece_owner(x)} tribe from ${region_names[where]}.`)
				check_region_overthrow(p, where)
			}
		}
		if (--game.count === 0 && !is_safe_house_in_play())
			end_action()
	},
	next() {
		push_undo()
		end_action()
	}
}

// PASSIVE: BLACKMAIL

function active_can_blackmail(r) {
	if ((r === Herat && active_has_blackmail_herat()) || (r === Kandahar && active_has_blackmail_kandahar())) {
		for (let p = 0; p < game.players.length; ++p) {
			let court = game.players[p].court
			for (let i = 0; i < court.length; ++i) {
				let c = court[i]
				if (cards[c].region === r && card_has_no_spies(c))
					return true
			}
		}
	}
	return false
}

states.blackmail = {
	prompt() {
		let bmh = game.where !== Kandahar && active_can_blackmail(Herat)
		let bmk = game.where !== Herat && active_can_blackmail(Kandahar)
		let msg = ""
		if (bmh && bmk)
			msg = "any Herat and/or Kandahar court card without a spy"
		else if (bmh)
			msg = "any Herat court card without a spy"
		else
			msg = "any Kandahar court card without a spy"
		if (game.selected < 0) {
			view.prompt = `Blackmail \u2014 select a spy to place on ${msg}.`
			gen_select_cylinder()
		} else {
			let bmh = game.where !== Kandahar && active_can_blackmail(Herat)
			let bmk = game.where !== Herat && active_can_blackmail(Kandahar)
			view.prompt = `Blackmail \u2014 place a spy on ${msg}.`
			for (let p = 0; p < game.players.length; ++p) {
				let court = game.players[p].court
				for (let i = 0; i < court.length; ++i) {
					let c = court[i]
					if (bmh && cards[c].region === Herat && card_has_no_spies(c))
						gen_action('card', c)
					if (bmk && cards[c].region === Kandahar && card_has_no_spies(c))
						gen_action('card', c)
				}
			}
		}
		gen_action('pass')
	},
	piece(x) {
		push_undo()
		game.selected = x
	},
	card(c) {
		push_undo()
		log(`Blackmail spy to #${c}.`)
		game.pieces[game.selected] = c
		game.used_pieces.push(game.selected)
		if (game.where < 0) {
			game.where = (cards[c].region === Herat) ? Kandahar : Herat
			game.selected = select_available_cylinder()
		} else {
			resume_actions()
		}
	},
	pass() {
		push_undo()
		resume_actions()
	},
}

// PASSIVE: SAFEHOUSE

function check_safe_house() {
	let first = game.phasing
	for (let p = first; p < game.players.length; ++p)
		if (check_player_safe_house(p))
			return
	for (let p = 0; p < first; ++p)
		if (check_player_safe_house(p))
			return
	if (game.actions >= 0)
		resume_actions()
	else if (game.where === 'riot')
		goto_discard_events()
	else
		goto_cleanup_hand()
}

function check_player_safe_house(p) {
	let x = player_cylinders(p)
	for (let i = x; i < x + 10; ++i) {
		if (game.pieces[i] === Safe_House) {
			if (player_has_safe_house(p)) {
				set_active(p)
				logbr()
				game.state = 'safe_house'
				game.selected = i
				return true
			} else {
				game.pieces[i] = 0
			}
		}
	}
	return false
}

states.safe_house = {
	inactive: "safe house",
	prompt() {
		view.prompt = `Safe House \u2014 you may place your killed spy on a Safe House.`
		if (player.court.indexOf(SAFE_HOUSE_1) >= 0)
			gen_action('card', SAFE_HOUSE_1)
		if (player.court.indexOf(SAFE_HOUSE_2) >= 0)
			gen_action('card', SAFE_HOUSE_2)
		gen_action('pass')
	},
	card(c) {
		push_undo()
		log(`${player_names[game.active]} spy to #${c}.`)
		game.pieces[game.selected] = c
		game.selected = -1
		check_safe_house()
	},
	pass() {
		push_undo()
		game.pieces[game.selected] = 0
		game.selected = -1
		check_safe_house()
	},
}

// PASSIVE: INSURRECTION

function check_insurrection() {
	let prince = which_player_has_insurrection()
	if (prince >= 0) {
		logbr()
		log(`Prince Akbar Khan`)
		game.count = 2
		game.selected = select_afghan_block()
		set_active(prince)
		game.state = 'insurrection'
	} else {
		end_dominance_check()
	}
}

states.insurrection = {
	prompt() {
		if (game.count > 0) {
			if (game.selected < 0) {
				view.prompt = `Insurrection \u2014 select an Afghan block to move.`
				gen_select_block()
			} else {
				view.prompt = `Insurrection \u2014 place Afghan army in Kabul.`
				gen_action('space', Kabul)
			}
		} else {
			view.prompt = `Insurrection \u2014 done.`
			gen_action('next')
		}
	},
	piece(x) {
		push_undo()
		game.selected = x
	},
	space() {
		push_undo()
		logi(`Afghan army to Kabul.`)
		game.pieces[game.selected] = Kabul
		game.selected = -1
		if (--game.count > 0)
			game.selected = select_available_block()
	},
	next() {
		push_undo()
		end_dominance_check()
	}
}

// CLEANUP

function player_court_size() {
	let stars = 3
	for (let i = 0; i < player.court.length; ++i) {
		let c = player.court[i]
		if (cards[c].suit === Political)
			stars += cards[c].rank
	}
	return stars
}

function player_hand_size() {
	let stars = 2
	for (let i = 0; i < player.court.length; ++i) {
		let c = player.court[i]
		if (cards[c].suit === Intelligence)
			stars += cards[c].rank
	}
	return stars
}

function goto_cleanup_court() {
	game.actions = -1
	logbr()
	if (player.court.length > player_court_size()) {
		game.state = 'cleanup_court'
	} else {
		goto_cleanup_hand()
	}
}

states.cleanup_court = {
	inactive: "cleanup court",
	prompt() {
		let size = player_court_size()
		if (player.court.length <= size) {
			view.prompt = `Discard cards in your court until you are within your limit \u2014 done.`
			gen_action('next')
		} else {
			view.prompt = `Discard cards in your court until you are within your limit (${size}).`
			for (let i = 0; i < player.court.length; ++i)
				gen_action('card', player.court[i])
		}
	},
	card(c) {
		push_undo()
		discard_court_card(c)
	},
	next() {
		push_undo()
		check_leverage()
	}
}

function goto_cleanup_hand() {
	if (player.hand.length > player_hand_size()) {
		game.state = 'cleanup_hand'
	} else {
		goto_discard_events()
	}
}

states.cleanup_hand = {
	inactive: "cleanup hand",
	prompt() {
		let size = player_hand_size()
		if (player.hand.length <= size) {
			view.prompt = `Discard cards in your hand until you are within your limit \u2014 done.`
			gen_action('next')
		} else {
			view.prompt = `Discard cards in your hand until you are within your limit (${size}).`
			for (let i = 0; i < player.hand.length; ++i)
				gen_action('card', player.hand[i])
		}
	},
	card(c) {
		push_undo()
		log(`Discarded #${c} from hand.`)
		remove_from_array(player.hand, c)
	},
	next() {
		push_undo()
		goto_discard_events()
	}
}

function goto_discard_events() {
	if (is_event_card(game.market_cards[0][0]) || is_event_card(game.market_cards[1][0])) {
		game.state = 'discard_events'
	} else {
		goto_refill_market()
	}
}

function do_discard_event(row, c) {
	game.market_cards[row][0] = 0
	logbr()
	log(`Discarded #${c}.`)
	if (is_dominance_check(c)) {
		do_dominance_check('discard')
	} else {
		events_if_discarded[cards[c].if_discarded](row)
	}
}

states.discard_events = {
	inactive: "discard event cards",
	prompt() {
		view.prompt = `Discard any event cards in the leftmost column of the market.`
		if (is_event_card(game.market_cards[0][0]))
			gen_action('card', game.market_cards[0][0])
		else if (is_event_card(game.market_cards[1][0]))
			gen_action('card', game.market_cards[1][0])
	},
	card(c) {
		push_undo()
		if (c === game.market_cards[0][0])
			do_discard_event(0, c)
		else
			do_discard_event(1, c)
	},
}

function discard_instability_cards() {
	for (let row = 0; row < 2; ++row) {
		for (let col = 0; col < 6; ++col) {
			let c = game.market_cards[row][col]
			if (is_dominance_check(c))
				game.market_cards[row][col] = 0
		}
	}
}

function goto_refill_market() {
	// Move all cards (and their rupees) to the left.
	for (let row = 0; row < 2; ++row) {
		let row_cards = game.market_cards[row]
		let row_coins = game.market_coins[row]
		for (let to = 0; to < 6; ++to) {
			if (row_cards[to] === 0) {
				for (let from = to + 1; from < 6; ++from) {
					if (row_cards[from] > 0) {
						row_cards[to] = row_cards[from]
						row_cards[from] = 0
						row_coins[to] += row_coins[from]
						row_coins[from] = 0
						break
					}
				}
			}
		}
	}

	// Instability ...
	let instability = 0
	for (let row = 0; row < 2; ++row) {
		for (let col = 0; col < 6; ++col) {
			let c = game.market_cards[row][col]
			if (is_dominance_check(c))
				++instability
		}
	}

	clear_undo()

	// Fill with new cards from left (top row in each column first)
	for (let col = 0; col < 6; ++col) {
		for (let row = 0; row < 2; ++row) {
			if (game.deck.length > 0) {
				if (game.market_cards[row][col] === 0) {
					let c = game.deck.pop()
					game.market_cards[row][col] = c
					if (is_dominance_check(c)) {
						if (++instability > 1) {
							game.state = 'instability'
							return
						}
					}
				}
			}
		}
	}

	goto_next_player()
}

states.instability = {
	prompt() {
		view.prompt = "Instability \u2014 perform a Dominance Check immediately."
		for (let row = 0; row < 2; ++row) {
			for (let col = 0; col < 6; ++col) {
				let c = game.market_cards[row][col]
				if (is_dominance_check(c))
					gen_action('card', c)
			}
		}
	},
	card() {
		logbr()
		log(`Instability!`)
		discard_instability_cards()
		do_dominance_check('instability')
	}
}

// EVENTS: IF DISCARDED

const events_if_discarded = {

	"Military" () {
		goto_favored_suit_event(Military)
	},

	"Embarrassment of Riches" () {
		game.events.embarrassment_of_riches = 1
		goto_discard_events()
	},

	"Disregard for Customs" () {
		game.events.disregard_for_customs = 1
		goto_discard_events()
	},

	"Failure to Impress" () {
		logi("Discarded all loyalty prizes.")
		for (let p = 0; p < game.players.length; ++p)
			game.players[p].prizes = 0
		goto_discard_events()
	},

	"Riots in Punjab" () {
		goto_riots(Punjab)
	},

	"Riots in Herat" () {
		goto_riots(Herat)
	},

	"No effect" () {
		logi("No effect.")
		goto_discard_events()
	},

	"Riots in Kabul" () {
		goto_riots(Kabul)
	},

	"Riots in Persia" () {
		goto_riots(Persia)
	},

	"Confidence Failure" () {
		game.state = 'confidence_failure'
		if (player.hand.length === 0)
			next_confidence_failure()
	},

	"Intelligence" () {
		goto_favored_suit_event(Intelligence)
	},

	"Political" () {
		goto_favored_suit_event(Political)
	},

}

function goto_favored_suit_event(suit) {
	if (!game.events.pashtunwali_values) {
		game.state = 'favored_suit'
		game.where = suit
	} else {
		goto_discard_events()
	}
}

states.favored_suit = {
	inactive: "favored suit",
	prompt() {
		view.prompt = `Change the favored suit to ${game.where}.`
		gen_action('suit', game.where)
	},
	suit(suit) {
		logi(`Favored suit to ${suit}.`)
		game.favored = suit
		goto_discard_events()
	},
}

function goto_riots(where) {
	game.state = 'riots'
	game.where = where
}

states.riots = {
	prompt() {
		view.prompt = `Riot in ${region_names[game.where]}.`
		gen_action('space', game.where)
	},
	space(s) {
		remove_all_tribes_and_armies(s)
		game.where = 'riot'
		check_leverage()
	},
}

states.confidence_failure = {
	inactive: "confidence failure",
	prompt() {
		view.prompt = "Confidence Failure \u2014 discard a card from your hand."
		for (let i = 0; i < player.hand.length; ++i)
			gen_action('card', player.hand[i])
	},
	card(c) {
		log(`${player_names[game.active]} discarded #${c} from hand.`)
		remove_from_array(player.hand, c)
		next_confidence_failure()
	},
}

function next_confidence_failure() {
	let next = game.active
	for (let i = 0; i < 10; ++i) {
		next = next_player(next)
		if (next === game.phasing)
			return goto_discard_events()
		if (game.players[next].hand.length > 0)
			return set_active(next)
	}
	throw new Error("FAIL")
}

// EVENTS: IF PURCHASED

const events_if_purchased = {

	"New Tactics" () {
		player.events.new_tactics = 1
		end_action()
	},

	"Koh-i-noor Recovered" () {
		player.events.koh_i_noor = 1
		end_action()
	},

	"Courtly Manners" () {
		player.events.courtly_manners = 1
		end_action()
	},

	"Rumor" () {
		game.state = 'rumor'
	},

	"Conflict Fatigue" () {
		game.events.conflict_fatigue = 1
		end_action()
	},

	"Nationalism" () {
		player.events.nationalism = 1
		end_action()
	},

	"Public Withdrawal" () {
		throw new Error("cannot purchase")
	},

	"Nation Building" () {
		player.events.nation_building = 1
		end_action()
	},

	"Backing of Persian Aristocracy" () {
		player.coins += 3
		end_action()
	},

	"Other Persuasive Methods" () {
		game.state = 'other_persuasive_methods'
	},

	"Pashtunwali Values" () {
		game.state = 'pashtunwali_values'
	},

	"Rebuke" () {
		game.state = 'rebuke'
	},

}

function check_public_withdrawal() {
	// Remove any money placed on card "Public Withdrawal" from the game.
	for (let row = 0; row < 2; ++row)
		for (let col = 0; col < 6; ++col)
			if (game.market_cards[row][col] === PUBLIC_WITHDRAWAL)
				game.market_coins[row][col] = 0
}

states.rumor = {
	prompt() {
		view.prompt = `Rumor \u2014 choose a player.`
		for (let p = 0; p < game.players.length; ++p)
			if (p !== game.active)
				gen_action('player_' + p)
	},
	player_0() { do_rumor(0) },
	player_1() { do_rumor(1) },
	player_2() { do_rumor(2) },
	player_3() { do_rumor(3) },
	player_4() { do_rumor(4) },
}

function do_rumor(p) {
	push_undo()
	log(`${player_names[game.active]} chose ${player_names[p]} for Rumor.`)
	game.players[p].events.rumor = 1
	end_action()
}

states.other_persuasive_methods = {
	inactive: "other persuasive methods",
	prompt() {
		view.prompt = `Other Persuasive Methods \u2014 exchange your hand with another player.`
		for (let p = 0; p < game.players.length; ++p)
			if (p !== game.active)
				gen_action('player_' + p)
	},
	player_0() { do_other_persuasive_methods(0) },
	player_1() { do_other_persuasive_methods(1) },
	player_2() { do_other_persuasive_methods(2) },
	player_3() { do_other_persuasive_methods(3) },
	player_4() { do_other_persuasive_methods(4) },
}

function do_other_persuasive_methods(p) {
	if (game.open)
		push_undo()
	else
		clear_undo() // No undo if closed hands.
	log(`${player_names[game.active]} exchanged hands with ${player_names[p]}.`)
	let swap = game.players[game.active].hand
	game.players[game.active].hand = game.players[p].hand
	game.players[p].hand = swap
	end_action()
}

states.pashtunwali_values = {
	inactive: "Pastunwali values",
	prompt() {
		view.prompt = `Pashtunwali Values \u2014 choose a suit to favor.`
		gen_action('suit', Political)
		gen_action('suit', Intelligence)
		gen_action('suit', Economic)
		gen_action('suit', Military)
	},
	suit(suit) {
		log(`Favored suit to ${suit}.`)
		game.favored = suit
		game.events.pashtunwali_values = 1
		end_action()
	},
}

states.rebuke = {
	prompt() {
		view.prompt = `Rebuke \u2014 remove all tribes and armies in a single region.`
		for (let s = first_region; s <= last_region; ++s)
			// TODO: can pick empty region?
			gen_action('space', s)
	},
	space(s) {
		push_undo()
		remove_all_tribes_and_armies(s)
		end_action()
	},
}

// DOMINANCE CHECK

function count_cylinders_in_play(p) {
	let n = 0
	let x = player_cylinders(p)
	for (let i = x; i < x + 10; ++i)
		if (game.pieces[i] > 0)
			++n
	return n
}

function count_influence_points(p) {
	let n = 1 + game.players[p].prizes
	let x = player_cylinders(p)

	if (!game.events.embarrassment_of_riches) {
		let gv = game.players[p].events.koh_i_noor ? 2 : 1
		for (let i = x; i < x + 10; ++i) {
			let s = game.pieces[i]
			if (s === Gift2 || s === Gift4 || s === Gift6)
				n += gv
		}
	}

	if (!game.players[p].events.rumor) {
		let court = game.players[p].court
		for (let i = 0; i < court.length; ++i)
			if (cards[court[i]].patriot)
				++n
	}

	return n
}

function assign_vp(points, score, sorted) {
	const PLACE = [ "1st", "2nd", "3rd" ]
	let place = 0
	sorted.sort((a,b) => b-a)
	while (points.length > 0 && sorted.length > 0) {
		let n = 0
		for (let p = 0; p < game.players.length; ++p)
			if (score[p] === sorted[0])
				++n
		let v = 0
		for (let i = 0; i < n; ++i)
			v += points[i] | 0
		v = Math.floor(v / n)
		let msg = `${PLACE[place]} place:`
		for (let p = 0; p < game.players.length; ++p) {
			if (score[p] === sorted[0]) {
				msg += "\n" + player_names[p] + " scored " + v + " vp."
				game.players[p].vp += v
			}
		}
		log(msg)
		points = points.slice(n)
		sorted = sorted.slice(n)
		place += n
	}
}

function count_dominance_cards() {
	let n = 0
	for (let row = 0; row < 2; ++row)
		for (let col = 0; col < 6; ++col)
			if (is_dominance_check(game.market_cards[row][col]))
				++n
	for (let i = 0; i < game.deck.length; ++i)
		if (is_dominance_check(game.deck[i]))
			++n
	return n
}

function is_final_dominance_check() {
	for (let row = 0; row < 2; ++row)
		for (let col = 0; col < 6; ++col)
			if (is_dominance_check(game.market_cards[row][col]))
				return false
	for (let i = 0; i < game.deck.length; ++i)
		if (is_dominance_check(game.deck[i]))
			return false
	return true
}

function rank_score(a, b) {
	return parseInt(b) - parseInt(a)
}

function do_dominance_check(reason) {
	let n_afghan = 0
	let n_british = 0
	let n_russian = 0
	let success = null

	for (let i = 0; i < 12; ++i) {
		if (game.pieces[i] > 0)
			n_afghan ++
		if (game.pieces[i+12] > 0)
			n_british ++
		if (game.pieces[i+24] > 0)
			n_russian ++
	}

	logi(n_afghan + " Afghan block" + (n_afghan !== 1 ? "s," : ","))
	logi(n_british + " British block" + (n_british !== 1 ? "s," : ","))
	logi(n_russian + " Russian block" + (n_russian !== 1 ? "s." : "."))

	let limit = game.events.conflict_fatigue ? 2 : 4
	if (n_afghan >= n_british+limit && n_afghan >= n_russian+limit)
		success = Afghan
	else if (n_british >= n_afghan+limit && n_british >= n_russian+limit)
		success = British
	else if (n_russian >= n_british+limit && n_russian >= n_afghan+limit)
		success = Russian

	let final = is_final_dominance_check()

	let score = new Array(game.players.length).fill(0)
	if (success) {
		logbr()
		log(`.dc.${success} Dominant ${success} Coalition`)
		logbr()
		if (final)
			log(`Final Dominance Check.`)
		let list = []
		for (let p = 0; p < game.players.length; ++p) {
			if (game.players[p].loyalty === success) {
				score[p] = count_influence_points(p)
				list.push(`${score[p]} ${player_names[p]} influence`)
			}
		}
		list.sort(rank_score)
		log("Ranking:\n" + list.join(",\n") + ".")
		if (final)
			assign_vp([10, 6, 2], score, score.filter(x=>x>0))
		else
			assign_vp([5, 3, 1], score, score.filter(x=>x>0))
	} else {
		logbr()
		log(`.dc.unsuccessful Unsuccessful Check`)
		logbr()
		if (final)
			log(`Final Dominance Check.`)
		let list = []
		for (let p = 0; p < game.players.length; ++p) {
			score[p] = count_cylinders_in_play(p)
			if (score[p] !== 1)
				list.push(`${score[p]} ${player_names[p]} cylinders`)
			else
				list.push(`${score[p]} ${player_names[p]} cylinder`)
		}
		list.sort(rank_score)
		log("Ranking:\n" + list.join(",\n") + ".")
		if (final)
			assign_vp([6, 2], score, score.slice())
		else
			assign_vp([3, 1], score, score.slice())
	}

	// Clear the board.
	if (success) {
		for (let i = 0; i < 36; ++i)
			game.pieces[i] = 0
	}

	// Check instant victory
	let vps = game.players.map(pp => pp.vp).sort((a,b)=>b-a)
	if (vps[0] >= vps[1] + 4)
		return goto_pause_game_over()

	if (final)
		return goto_pause_game_over()

	game.events = {}
	for (let p = 0; p < game.players.length; ++p)
		game.players[p].events = {}

	game.where = reason

	check_insurrection()
}

function end_dominance_check() {
	set_active(game.phasing)
	if (game.state === 'game_over')
		return
	switch (game.where) {
	case 'discard':
		return goto_discard_events()
	case 'purchase':
		return resume_actions()
	case 'instability':
		return goto_refill_market()
	}
}

function vp_tie(pp) {
	let court = pp.court
	let stars = 0
	for (let i = 0; i < court.length; ++i) {
		let c = court[i]
		if (cards[c].suit === Military)
			stars += cards[c].rank
	}
	return pp.vp * 10000 + stars * 100 + pp.coins
}

function compute_victory() {
	let vps = game.players.map((pp,i) => [vp_tie(pp),i]).sort((a,b)=>b[0]-a[0])
	let is_winner = false
	let result = []
	for (let i = 0; i < vps.length; ++i) {
		if (vps[i][0] === vps[0][0]) {
			result.push(player_names[vps[i][1]])
			if (vps[i][1] === game.active)
				is_winner = true
		}
	}
	game.result = result.join(", ")
	game.victory = result.join(" and ") + " won!"
	logbr()
	log(game.victory)
	return is_winner
}

function goto_pause_game_over() {
	let is_winner = compute_victory()
	if (game.undo && game.undo.length > 0 && !is_winner) {
		game.state = 'pause_game_over'
	} else {
		game.state = 'game_over'
		game.active = 5
	}
}

states.pause_game_over = {
	inactive: "game over",
	prompt() {
		view.prompt = game.victory
		gen_action('end_game')
	},
	end_game() {
		game.state = 'game_over'
		game.active = 5
	}
}

// SETUP

function prepare_deck() {
	let court_cards = []
	for (let i = 1; i <= 100; ++i)
		court_cards.push(i)

	let event_cards = []
	for (let i = 105; i <= 116; ++i)
		event_cards.push(i)

	let piles = [ [], [], [], [], [], [] ]

	shuffle(court_cards)

	for (let i = 0; i < 6; ++i)
		for (let k = 0; k < 5 + game.players.length; ++k)
			piles[i].push(court_cards.pop())

	// Leftmost pile is 5, rightmost pile is 0
	piles[3].push(101)
	piles[2].push(102)
	piles[1].push(103)
	piles[0].push(104)

	shuffle(event_cards)

	piles[4].push(event_cards.pop())
	piles[4].push(event_cards.pop())
	piles[3].push(event_cards.pop())
	piles[2].push(event_cards.pop())
	piles[1].push(event_cards.pop())
	piles[0].push(event_cards.pop())

	for (let i = 0; i < 6; ++i)
		shuffle(piles[i])

	game.deck = piles.flat()
}

exports.setup = function (seed, scenario, options) {
	let player_count = scenario_player_count[scenario]

	game = {
		seed: seed,
		log: [],
		undo: [],

		open: options.open_hands ? 1 : 0,

		active: 0,
		state: "none",
		used_cards: [],
		used_pieces: [],
		count: 0,
		reserve: 0,
		bribe: -1,
		selected: -1,
		region: 0,
		card: 0,
		where: 0,

		phasing: null,
		actions: 0,
		deck: [],
		favored: Political,
		events: {},
		pieces: new Array(36 + player_count * 10).fill(0),
		market_cards: [
			[0,0,0,0,0,0],
			[0,0,0,0,0,0],
		],
		market_coins: [
			[0,0,0,0,0,0],
			[0,0,0,0,0,0],
		],
		players: [],
	}

	for (let i = 0; i < player_count; ++i) {
		game.players[i] = {
			vp: 0,
			loyalty: null,
			prizes: 0,
			coins: 4,
			hand: [],
			court: [],
			events: {},
		}
	}

	// Old RNG for ancient replays
	if (options.rng)
		game.rng = options.rng

	prepare_deck()

	for (let col = 0; col < 6; ++col)
		for (let row = 0; row < 2; ++row)
			game.market_cards[row][col] = game.deck.pop()

	// Starting loyalty, starting with a random player.
	game.state = 'loyalty'
	game.active = random(player_count)

	return save_game()
}

function load_game(state) {
	game = state
	game.active = player_index[game.active]
	update_aliases()
}

function save_game() {
	game.active = player_names[game.active]
	return game
}

exports.action = function (state, current, action, arg) {
	load_game(state)
	let S = states[game.state]
	if (action in S) {
		S[action](arg)
	} else {
		if (action === 'undo' && game.undo && game.undo.length > 0)
			pop_undo()
		else
			throw new Error("Invalid action: " + action)
	}
	return save_game()
}

exports.resign = function (state, current) {
	load_game(state)
	logbr()
	log(`${current} resigned.`)
	game.state = 'game_over'
	game.active = 5
	game.victory = `${current} resigned.`

	if (game.players.length === 2) {
		if (current === player_names[0])
			game.result = player_names[1]
		else
			game.result = player_names[0]
	} else {
		game.result = "None"
	}

	return save_game()
}

exports.is_checkpoint = (a, b) => a.phasing !== b.phasing

exports.view = function (state, current) {
	current = player_index[current]
	load_game(state)

	view = {
		log: game.log,
		active: player_names[game.active],
		prompt: null,
		favored: game.favored,
		events: game.events,
		pieces: game.pieces,
		market_cards: game.market_cards,
		market_coins: game.market_coins,
		players: game.players,
		selected: game.selected,
		cards: [ game.deck.length, count_dominance_cards() ],
		open: game.open,
	}

	if (game.state === 'game_over') {
		view.prompt = game.victory
	} else if (current === 'Observer' || game.active !== current) {
		let inactive = states[game.state].inactive || game.state
		view.prompt = `Waiting for ${player_names[game.active]} \u2014 ${inactive}...`
	} else {
		view.actions = {}
		states[game.state].prompt()
		view.prompt = player_names[game.active] + ": " + view.prompt
		if (game.undo && game.undo.length > 0)
			view.actions.undo = 1
		else
			view.actions.undo = 0
	}

	save_game()
	return view
}