"use strict"

function set_has(set, item) {
	let a = 0
	let b = set.length - 1
	while (a <= b) {
		let m = (a + b) >> 1
		let x = set[m]
		if (item < x)
			b = m - 1
		else if (item > x)
			a = m + 1
		else
			return true
	}
	return false
}

const FRANKS = "Franks"
const SARACENS = "Saracens"

const ENEMY = { Saracens: "Franks", Franks: "Saracens" }

const NOWHERE = 0
const DEAD = 1
const F_POOL = 2
const S_POOL = 3
const SEA = 4

const ENGLAND = 5
const FRANCE = 6
const GERMANIA = 7

const SHIELD_NAMES = {}
SHIELD_NAMES[town_index["Antioch"]] = "Bohemond, Templars, Turcopoles"
SHIELD_NAMES[town_index["Latakia"]] = "Bohemond"
SHIELD_NAMES[town_index["Sa\xf4ne"]] = "Josselin"
SHIELD_NAMES[town_index["Margat"]] = "Hospitallers"
SHIELD_NAMES[town_index["Krak"]] = "Hospitallers"
SHIELD_NAMES[town_index["Tartus"]] = "Templars"
SHIELD_NAMES[town_index["Tripoli"]] = "Bohemond, Raymond"
SHIELD_NAMES[town_index["Beirut"]] = "Turcopoles, King Guy"
SHIELD_NAMES[town_index["Sidon"]] = "Reynald (Sidon)"
SHIELD_NAMES[town_index["Beaufort"]] = "Reynald (Sidon)"
SHIELD_NAMES[town_index["Tyre"]] = "Conrad, King Guy"
SHIELD_NAMES[town_index["Acre"]] = "Turcopoles, Hospitallers, King Guy"
SHIELD_NAMES[town_index["Tiberias"]] = "Turcopoles, Raymond"
SHIELD_NAMES[town_index["Baisan"]] = "Hospitallers"
SHIELD_NAMES[town_index["Caesarea"]] = "Walter"
SHIELD_NAMES[town_index["Nablus"]] = "Balian"
SHIELD_NAMES[town_index["Amman"]] = "Templars"
SHIELD_NAMES[town_index["Jaffa"]] = "King Guy"
SHIELD_NAMES[town_index["Jerusalem"]] = "King Guy, Hospitallers, Templars"
SHIELD_NAMES[town_index["Ascalon"]] = "Balian, King Guy"
SHIELD_NAMES[town_index["Hebron"]] = "King Guy"
SHIELD_NAMES[town_index["Gaza"]] = "Templars"
SHIELD_NAMES[town_index["Kerak"]] = "Reynald (Kerak)"
SHIELD_NAMES[town_index["Egypt"]] = "Saladin, Qara-Qush, Yuzpah"
SHIELD_NAMES[town_index["Aleppo"]] = "Saladin, Sanjar, Zangi"
SHIELD_NAMES[town_index["Ashtera"]] = "Yazkuj"
SHIELD_NAMES[town_index["Artah"]] = "Sulaiman"
SHIELD_NAMES[town_index["Damascus"]] = "Saladin, Keukburi, Al Mashtub"
SHIELD_NAMES[town_index["Homs"]] = "Tuman, Shirkuh"
SHIELD_NAMES[town_index["Zerdana"]] = "Jurdik"
SHIELD_NAMES[town_index["Baalbek"]] = "Bahram"
SHIELD_NAMES[town_index["Hama"]] = "Taqi al Din"
SHIELD_NAMES[town_index["Banyas"]] = "Qaimaz"

const KINGDOM = {
	"Syria": "Syria",
	"Jerusalem": "Kingdom of Jerusalem",
	"Antioch": "Principality of Antioch",
	"Tripoli": "County of Tripoli",
}

const VICTORY_TOWNS = [
	town_index["Aleppo"],
	town_index["Damascus"],
	town_index["Egypt"],
	town_index["Antioch"],
	town_index["Tripoli"],
	town_index["Acre"],
	town_index["Jerusalem"]
]

let label_layout = window.localStorage['crusader-rex/label-layout'] || 'spread'

function set_spread_layout() {
	label_layout = 'spread'
	window.localStorage['crusader-rex/label-layout'] = label_layout
	update_map()
}

function set_stack_layout() {
	label_layout = 'stack'
	window.localStorage['crusader-rex/label-layout'] = label_layout
	update_map()
}

function toggle_blocks() {
	document.getElementById("map").classList.toggle("hide_blocks")
}

let ui = {
	cards: [],
	card_backs: [],
	towns: [],
	blocks: [],
	battle_menu: [],
	battle_block: [],
	present: new Set(),
}

function on_focus_space_tip(x) {
	ui.towns[x].classList.add("tip")
}

function on_blur_space_tip(x) {
	ui.towns[x].classList.remove("tip")
}

function on_click_space_tip(x) {
	ui.towns[x].scrollIntoView({ block:"center", inline:"center", behavior:"smooth" })
}

function sub_space_name(match, p1, offset, string) {
	let x = p1 | 0
	let n = TOWNS[x].name
	return `<span class="tip" onmouseenter="on_focus_space_tip(${x})" onmouseleave="on_blur_space_tip(${x})" onclick="on_click_space_tip(${x})">${n}</span>`
}

function on_log(text) {
	let p = document.createElement("div")

	if (text.match(/^>/)) {
                text = text.substring(1)
                p.className = "i"
        }

	text = text.replace(/&/g, "&amp;")
	text = text.replace(/</g, "&lt;")
	text = text.replace(/>/g, "&gt;")

	text = text.replace(/\u2192 /g, "\u2192\xa0")

	text = text.replace(/^([A-Z]):/, '<span class="$1"> $1 </span>')

	text = text.replace(/#(\d+)/g, sub_space_name)

	if (text.match(/^\.h1 /))
		p.className = 'h1', text = text.substring(4)
	if (text.match(/^\.h2 F/))
		p.className = 'h2 F', text = text.substring(4)
	if (text.match(/^\.h2 S/))
		p.className = 'h2 S', text = text.substring(4)
	if (text.match(/^\.h3 /))
		p.className = 'h3', text = text.substring(4)
	if (text.match(/^\.h4 /))
		p.className = 'h4', text = text.substring(4)

	p.innerHTML = text
	return p
}

function on_focus_town(evt) {
	let where = evt.target.town
	let text = TOWNS[where].name
	if (where in SHIELD_NAMES)
		text += " \u2014 " + SHIELD_NAMES[where]
	let kingdom = KINGDOM[TOWNS[where].region]
	if (kingdom)
		text += " \u2014 " + kingdom
	if (VICTORY_TOWNS.includes(where))
		text += " \u2014 1 VP"
	document.getElementById("status").textContent = text
}

function on_blur_town(evt) {
	document.getElementById("status").textContent = ""
}

function on_click_town(evt) {
	let where = evt.target.town
	send_action('town', where) || send_action('townb', where)
}

const STEP_TEXT = [ 0, "I", "II", "III", "IIII" ]
const HEIR_TEXT = [ 0, '\u00b9', '\u00b2', '\u00b3', '\u2074', '\u2075' ]

function block_name(who) { return BLOCKS[who].name; }
function block_home(who) { return BLOCKS[who].home; }
function block_owner(who) { return BLOCKS[who].owner; }

function on_focus_map_block(evt) {
	let info = BLOCKS[evt.target.block]
	let where = view.location[evt.target.block]
	if ((info.owner === player || info.owner === "Assassins") && where !== S_POOL && where !== F_POOL) {
		let text = info.name + " "
		if (info.move)
			text += info.move + "-"
		text += STEP_TEXT[info.steps] + "-" + info.initiative + info.fire_power
		document.getElementById("status").textContent = text
	} else {
		document.getElementById("status").textContent = info.owner
	}
}

function on_blur_map_block(evt) {
	document.getElementById("status").textContent = ""
}

function on_click_map_block(evt) {
	let b = evt.target.block
	if (!view.battle)
		send_action('block', b)
}

function on_focus_battle_block(evt) {
	let b = evt.target.block
	let msg

	if (!evt.target.classList.contains("known")) {
		if (block_owner(b) === FRANKS)
			msg = "Franks"
		else if (block_owner(b) === SARACENS)
			msg = "Saracens"
	} else {
		msg = block_name(b)
	}

	if (view.actions && view.actions.fire && view.actions.fire.includes(b))
		msg = "Fire with " + msg
	else if (view.actions && view.actions.storm && view.actions.storm.includes(b))
		msg = "Storm with " + msg
	else if (view.actions && view.actions.sally && view.actions.sally.includes(b))
		msg = "Sally with " + msg
	else if (view.actions && view.actions.withdraw && view.actions.withdraw.includes(b))
		msg = "Withdraw with " + msg
	else if (view.actions && view.actions.hit && view.actions.hit.includes(b))
		msg = "Take hit on " + msg

	document.getElementById("status").textContent = msg
}

function on_blur_battle_block(evt) {
	document.getElementById("status").textContent = ""
}

function on_click_battle_block(evt) {
	let b = evt.target.block
	send_action('block', b)
}

function on_focus_fire(evt) {
	document.getElementById("status").textContent =
		"Fire with " + block_name(evt.target.block)
}

function on_focus_retreat(evt) {
	if (view.battle.storming.includes(evt.target.block))
		document.getElementById("status").textContent =
			"Withdraw with " + block_name(evt.target.block)
	else
		document.getElementById("status").textContent =
			"Retreat with " + block_name(evt.target.block)
}

function on_focus_harry(evt) {
	document.getElementById("status").textContent =
		"Harry with " + block_name(evt.target.block)
}

function on_focus_charge(evt) {
	document.getElementById("status").textContent =
		"Charge with " + block_name(evt.target.block)
}

function on_focus_withdraw(evt) {
	document.getElementById("status").textContent =
		"Withdraw with " + block_name(evt.target.block)
}

function on_focus_storm(evt) {
	document.getElementById("status").textContent =
		"Storm with " + block_name(evt.target.block)
}

function on_focus_sally(evt) {
	document.getElementById("status").textContent =
		"Sally with " + block_name(evt.target.block)
}

function on_focus_hit(evt) {
	document.getElementById("status").textContent =
		"Take hit on " + block_name(evt.target.block)
}

function on_blur_battle_button(evt) {
	document.getElementById("status").textContent = ""
}

function on_click_hit(evt) { send_action('hit', evt.target.block); }
function on_click_fire(evt) { send_action('fire', evt.target.block); }
function on_click_retreat(evt) { send_action('retreat', evt.target.block); }
function on_click_charge(evt) { send_action('charge', evt.target.block); }
function on_click_harry(evt) { send_action('harry', evt.target.block); }
function on_click_withdraw(evt) { send_action('withdraw', evt.target.block); }
function on_click_storm(evt) { send_action('storm', evt.target.block); }
function on_click_sally(evt) { send_action('sally', evt.target.block); }

function on_click_card(evt) {
	let c = evt.target.id.split("+")[1] | 0
	send_action('play', c)
}

function build_battle_button(menu, b, c, click, enter, img_src) {
	let img = new Image()
	img.draggable = false
	img.classList.add("action")
	img.classList.add(c)
	img.setAttribute("src", img_src)
	img.addEventListener("click", click)
	img.addEventListener("mouseenter", enter)
	img.addEventListener("mouseleave", on_blur_battle_button)
	img.block = b
	menu.appendChild(img)
}

function battle_block_class_name(block) {
	return `block block_${block.image} ${block.owner}`
}

function build_battle_block(b, block) {
	let element = document.createElement("div")
	element.className = battle_block_class_name(block)
	element.addEventListener("mouseenter", on_focus_battle_block)
	element.addEventListener("mouseleave", on_blur_battle_block)
	element.addEventListener("click", on_click_battle_block)
	element.block = b
	ui.battle_block[b] = element

	let menu_list = document.createElement("div")
	menu_list.className = "battle_menu_list"

	build_battle_button(menu_list, b, "hit",
		on_click_hit, on_focus_hit,
		"/images/cross-mark.svg")
	build_battle_button(menu_list, b, "charge",
		on_click_charge, on_focus_charge,
		"/images/mounted-knight.svg")
	build_battle_button(menu_list, b, "fire",
		on_click_fire, on_focus_fire,
		"/images/pointy-sword.svg")
	build_battle_button(menu_list, b, "harry",
		on_click_harry, on_focus_harry,
		"/images/arrow-flights.svg")
	build_battle_button(menu_list, b, "retreat",
		on_click_retreat, on_focus_retreat,
		"/images/flying-flag.svg")
	build_battle_button(menu_list, b, "withdraw",
		on_click_withdraw, on_focus_withdraw,
		"/images/stone-tower.svg")
	build_battle_button(menu_list, b, "storm",
		on_click_storm, on_focus_storm,
		"/images/siege-tower.svg")
	build_battle_button(menu_list, b, "sally",
		on_click_sally, on_focus_sally,
		"/images/doorway.svg")

	let menu = document.createElement("div")
	menu.className = "battle_menu"
	menu.appendChild(element)
	menu.appendChild(menu_list)
	menu.block = b
	ui.battle_menu[b] = menu
}

function build_map_block(b, block) {
	let element = document.createElement("div")
	element.classList.add("block")
	element.classList.add("known")
	element.classList.add(BLOCKS[b].owner)
	element.classList.add("block_" + block.image)
	element.addEventListener("mouseenter", on_focus_map_block)
	element.addEventListener("mouseleave", on_blur_map_block)
	element.addEventListener("click", on_click_map_block)
	element.block = b
	return element
}

function build_town(t, town) {
	let element = document.createElement("div")
	element.town = t
	element.classList.add("town")
	element.addEventListener("mouseenter", on_focus_town)
	element.addEventListener("mouseleave", on_blur_town)
	element.addEventListener("click", on_click_town)
	ui.towns_element.appendChild(element)
	return element
}

function build_map() {
	let element

	ui.blocks_element = document.getElementById("blocks")
	ui.offmap_element = document.getElementById("offmap")
	ui.towns_element = document.getElementById("towns")

	for (let c = 1; c <= 27; ++c) {
		ui.cards[c] = document.getElementById("card+"+c)
		ui.cards[c].addEventListener("click", on_click_card)
	}

	for (let c = 1; c <= 6; ++c)
		ui.card_backs[c] = document.getElementById("back+"+c)

	for (let t = SEA; t < TOWNS.length; ++t) {
		let town = TOWNS[t]
		let name = town.name
		if (t === SEA) {
			element = document.getElementById("svgmap").getElementById("sea")
			element.town = SEA
			element.addEventListener("mouseenter", on_focus_town)
			element.addEventListener("mouseleave", on_blur_town)
			element.addEventListener("click", on_click_town)
			ui.towns[t] = element
		} else {
			element = ui.towns[t] = build_town(t, town)
			let xo = Math.round(element.offsetWidth/2)
			let yo = Math.round(element.offsetHeight/2)
			element.style.left = (town.layout.x - xo) + "px"
			element.style.top = (town.layout.y - yo) + "px"
		}
	}

	for (let b = 0; b < BLOCKS.length; ++b) {
		let block = BLOCKS[b]
		ui.blocks[b] = build_map_block(b, block)
		build_battle_block(b, block)
	}
}

function update_steps(b, steps, element) {
	element.classList.remove("r0")
	element.classList.remove("r1")
	element.classList.remove("r2")
	element.classList.remove("r3")
	element.classList.add("r"+(BLOCKS[b].steps - steps))
}

function layout_blocks(location, secret, known) {
	if (label_layout === 'stack')
		document.getElementById("map").classList.add("stack_layout")
	else
		document.getElementById("map").classList.remove("stack_layout")
	if (label_layout === 'spread' ||
		(location === S_POOL || location === F_POOL || location === DEAD ||
			location === ENGLAND || location === FRANCE || location === GERMANIA))
		layout_blocks_spread(location, secret, known)
	else
		layout_blocks_stacked(location, secret, known)
}

function layout_blocks_spread(town, north, south) {
	let wrap = TOWNS[town].layout.wrap
	let rows = []

	if ((north.length > wrap || south.length > wrap) || (north.length + south.length <= 3)) {
		north = north.concat(south)
		south = []
	}

	function wrap_row(input) {
		while (input.length > wrap) {
			rows.push(input.slice(0, wrap))
			input = input.slice(wrap)
		}
		if (input.length > 0)
			rows.push(input)
	}

	wrap_row(north)
	wrap_row(south)

	if (TOWNS[town].layout.minor > 0.5)
		rows.reverse()

	for (let r = 0; r < rows.length; ++r) {
		let cols = rows[r]
		for (let c = 0; c < cols.length; ++c)
			position_block(town, r, rows.length, c, cols.length, cols[c])
	}
}

function position_block(town, row, n_rows, col, n_cols, element) {
	let space = TOWNS[town]
	let block_size = 60+6
	let padding = 4
	if (town === ENGLAND || town === FRANCE || town === GERMANIA)
		padding = 21
	let offset = block_size + padding
	let row_size = (n_rows-1) * offset
	let col_size = (n_cols-1) * offset
	let x = space.layout.x
	let y = space.layout.y

	if (space.layout.axis === 'X') {
		x -= col_size * space.layout.major
		y -= row_size * space.layout.minor
		x += col * offset
		y += row * offset
	} else {
		y -= col_size * space.layout.major
		x -= row_size * space.layout.minor
		y += col * offset
		x += row * offset
	}

	element.style.left = ((x - block_size/2)|0)+"px"
	element.style.top = ((y - block_size/2)|0)+"px"
}

function layout_blocks_stacked(location, secret, known) {
	let s = secret.length
	let k = known.length
	let both = secret.length > 0 && known.length > 0
	let i = 0
	while (secret.length > 0)
		position_block_stacked(location, i++, (s-1)/2, both ? 1 : 0, secret.shift())
	i = 0
	while (known.length > 0)
		position_block_stacked(location, i++, (k-1)/2, 0, known.shift())
}

function position_block_stacked(location, i, c, k, element) {
	let space = TOWNS[location]
	let block_size = 60+6
	let x = space.x + (i - c) * 16 + k * 12
	let y = space.y + (i - c) * 16 - k * 12
	element.style.left = ((x - block_size/2)|0)+"px"
	element.style.top = ((y - block_size/2)|0)+"px"
}

function show_block(element) {
	if (element.parentElement !== ui.blocks_element)
		ui.blocks_element.appendChild(element)
}

function hide_block(element) {
	if (element.parentElement !== ui.offmap_element)
		ui.offmap_element.appendChild(element)
}

function is_known_block(info, who, town) {
	if (view.game_over && player === 'Observer')
		return true
	if (town === DEAD)
		return true
	if ((town === S_POOL || town === F_POOL) && who !== view.who)
		return false
	if (info.owner === player || info.owner === "Assassins" || who === view.assassinate)
		return true
	return false
}

function update_map() {
	let layout = {}

	document.getElementById("frank_vp").textContent = view.f_vp + " VP"
	document.getElementById("saracen_vp").textContent = view.s_vp + " VP"
	document.getElementById("timeline").className = "year_" + view.year
	if (view.turn < 1)
		document.getElementById("turn_info").textContent =
			"Year " + view.year
	else if (view.turn < 6)
		document.getElementById("turn_info").textContent =
			"Turn " + view.turn + " of Year " + view.year
	else
		document.getElementById("turn_info").textContent =
			"Winter Turn of Year " + view.year

	for (let t = 0; t < TOWNS.length; ++t)
		layout[t] = { north: [], south: [] }

	for (let b = 0; b < BLOCKS.length; ++b) {
		let info = BLOCKS[b]
		let element = ui.blocks[b]
		let town = view.location[b]
		let moved = set_has(view.moved, b) ? " moved" : ""
		if (town === DEAD) {
			moved = " moved"
		}
		if (town === NOWHERE) {
			town = DEAD
			moved = " removed"
		}
		if (is_known_block(info, b, town)) {
			let image = " block_" + info.image
			let steps = " r" + (info.steps - view.steps[b])
			let known = " known"
			element.classList = info.owner + known + " block" + image + steps + moved
		} else {
			let besieging = ""
			if (view.sieges[town] === info.owner) {
				if (view.winter_campaign === town)
					besieging = " winter_campaign"
				else
					besieging = " besieging"
			}
			let jihad = ""
			if (view.jihad === town && info.owner === view.p1)
				jihad = " jihad"
			element.classList = info.owner + " block" + moved + besieging + jihad
		}
		if (town !== DEAD) {
			if (info.owner === FRANKS)
				layout[town].north.push(element)
			else
				layout[town].south.push(element)
		}
		show_block(element)
	}

	for (let b = 0; b < BLOCKS.length; ++b) {
		let info = BLOCKS[b]
		let element = ui.blocks[b]
		let town = view.location[b]
		if (town === DEAD) {
			if (info.owner === FRANKS)
				layout[F_POOL].north.unshift(element)
			else
				layout[S_POOL].south.unshift(element)
		}
	}

	for (let b = 0; b < BLOCKS.length; ++b) {
		let info = BLOCKS[b]
		let element = ui.blocks[b]
		let town = view.location[b]
		if (town === NOWHERE) {
			if (info.owner === FRANKS)
				layout[F_POOL].north.unshift(element)
			else
				layout[S_POOL].south.unshift(element)
		}
	}

	for (let t = 0; t < TOWNS.length; ++t)
		layout_blocks(t, layout[t].north, layout[t].south)

	for (let t = SEA; t < TOWNS.length; ++t) {
		if (ui.towns[t]) {
			ui.towns[t].classList.remove('highlight')
			ui.towns[t].classList.remove('muster')
			ui.towns[t].classList.remove('bad')
		}
	}
	if (view.actions && view.actions.town) {
		for (let t of view.actions.town) {
			ui.towns[t].classList.add('highlight')
		}
	}
	if (view.actions && view.actions.townb) {
		for (let t of view.actions.townb) {
			ui.towns[t].classList.add('highlight')
			ui.towns[t].classList.add('bad')
		}
	}
	if (view.muster)
		ui.towns[view.muster].classList.add('muster')

	if (!view.battle) {
		if (view.actions && view.actions.block)
			for (let b of view.actions.block)
				ui.blocks[b].classList.add('highlight')
	}
	if (view.who >= 0 && !view.battle)
		ui.blocks[view.who].classList.add('selected')
	for (let b of view.castle)
		ui.blocks[b].classList.add('castle')
}

function update_card_display(element, card, prior_card) {
	if (!card && !prior_card) {
		element.className = "show card card_back"
	} else if (prior_card) {
		element.className = "show card prior " + CARDS[prior_card].image
	} else {
		element.className = "show card " + CARDS[card].image
	}
}

function update_cards() {
	update_card_display(document.getElementById("frank_card"), view.f_card, view.prior_f_card)
	update_card_display(document.getElementById("saracen_card"), view.s_card, view.prior_s_card)

	for (let c = 1; c <= 27; ++c) {
		let element = ui.cards[c]
		if (view.hand.includes(c)) {
			element.classList.add("show")
			if (view.actions && view.actions.play) {
				if (view.actions.play.includes(c)) {
					element.classList.add("enabled")
					element.classList.remove("disabled")
				} else {
					element.classList.remove("enabled")
					element.classList.add("disabled")
				}
			} else {
				element.classList.remove("enabled")
				element.classList.remove("disabled")
			}
		} else {
			element.classList.remove("show")
		}
	}

	let n = view.hand.length
	for (let c = 1; c <= 6; ++c)
		if (c <= n && player === 'Observer')
			ui.card_backs[c].classList.add("show")
		else
			ui.card_backs[c].classList.remove("show")
}

function compare_blocks(a, b) {
	let aa = BLOCKS[a].initiative + BLOCKS[a].fire_power
	let bb = BLOCKS[b].initiative + BLOCKS[b].fire_power
	if (aa === bb)
		return (a < b) ? -1 : (a > b) ? 1 : 0
	return (aa < bb) ? -1 : (aa > bb) ? 1 : 0
}

function insert_battle_block(root, node, block) {
	for (let i = 0; i < root.children.length; ++i) {
		let prev = root.children[i]
		if (compare_blocks(prev.block, block) > 0) {
			root.insertBefore(node, prev)
			return
		}
	}
	root.appendChild(node)
}

function update_battle() {
	function fill_cell(name, list, show) {
		let cell = document.getElementById(name)

		ui.present.clear()

		for (let block of list) {
			ui.present.add(block)

			if (!cell.contains(ui.battle_menu[block]))
				insert_battle_block(cell, ui.battle_menu[block], block)

			ui.battle_menu[block].className = "battle_menu"
			if (view.actions && view.actions.fire && view.actions.fire.includes(block))
				ui.battle_menu[block].classList.add('fire')
			if (view.actions && view.actions.retreat && view.actions.retreat.includes(block))
				ui.battle_menu[block].classList.add('retreat')
			if (view.actions && view.actions.harry && view.actions.harry.includes(block))
				ui.battle_menu[block].classList.add('harry')
			if (view.actions && view.actions.charge && view.actions.charge.includes(block))
				ui.battle_menu[block].classList.add('charge')
			if (view.actions && view.actions.withdraw && view.actions.withdraw.includes(block))
				ui.battle_menu[block].classList.add('withdraw')
			if (view.actions && view.actions.storm && view.actions.storm.includes(block))
				ui.battle_menu[block].classList.add('storm')
			if (view.actions && view.actions.sally && view.actions.sally.includes(block))
				ui.battle_menu[block].classList.add('sally')
			if (view.actions && view.actions.charge && view.actions.charge.includes(block))
				ui.battle_menu[block].classList.add('charge')
			if (view.actions && view.actions.treachery && view.actions.treachery.includes(block))
				ui.battle_menu[block].classList.add('treachery')
			if (view.actions && view.actions.hit && view.actions.hit.includes(block))
				ui.battle_menu[block].classList.add('hit')

			let class_name = battle_block_class_name(BLOCKS[block])
			if (view.actions && view.actions.block && view.actions.block.includes(block))
				class_name += " highlight"
			if (set_has(view.moved, block))
				class_name += " moved"
			if (block === view.who)
				class_name += " selected"
			if (block === view.battle.halfhit)
				class_name += " halfhit"
			if (view.jihad === view.battle.town && block_owner(block) === view.p1)
				class_name += " jihad"

			if (view.battle.sallying.includes(block))
				show = true
			if (view.battle.storming.includes(block))
				show = true
			if (show || block_owner(block) === player) {
				class_name += " known"
				ui.battle_block[block].className = class_name
				update_steps(block, view.steps[block], ui.battle_block[block], false)
			} else {
				ui.battle_block[block].className = class_name
			}

		}

		for (let b = 0; b < BLOCKS.length; ++b) {
			if (!ui.present.has(b)) {
				if (cell.contains(ui.battle_menu[b]))
					cell.removeChild(ui.battle_menu[b])
			}
		}
	}

	if (player === FRANKS) {
		fill_cell("ER", view.battle.SR, false)
		fill_cell("EC", view.battle.SC, view.battle.show_castle)
		fill_cell("EF", view.battle.SF, view.battle.show_field)
		fill_cell("FF", view.battle.FF, view.battle.show_field)
		fill_cell("FC", view.battle.FC, view.battle.show_castle)
		fill_cell("FR", view.battle.FR, false)
		document.getElementById("FC").className = "c" + view.battle.FCS
		document.getElementById("EC").className = "c" + view.battle.SCS
	} else {
		fill_cell("ER", view.battle.FR, false)
		fill_cell("EC", view.battle.FC, view.battle.show_castle)
		fill_cell("EF", view.battle.FF, view.battle.show_field)
		fill_cell("FF", view.battle.SF, view.battle.show_field)
		fill_cell("FC", view.battle.SC, view.battle.show_castle)
		fill_cell("FR", view.battle.SR, false)
		document.getElementById("EC").className = "c" + view.battle.FCS
		document.getElementById("FC").className = "c" + view.battle.SCS
	}
}

let flash_timer = 0
function start_flash() {
	let element = document.getElementById("battle_message")
	let tick = true
	if (flash_timer)
		return
	flash_timer = setInterval(function () {
		if (!view.flash_next) {
			element.textContent = view.battle ? view.battle.flash : ""
			clearInterval(flash_timer)
			flash_timer = 0
		} else {
			element.textContent = tick ? view.battle.flash : view.flash_next
			tick = !tick
		}
	}, 1000)
}

function on_update() {
	action_button("eliminate", "Eliminate")
	action_button("winter_campaign", "Winter campaign")
	action_button("sea_move", "Sea move")
	action_button("end_sea_move", "End sea move")
	action_button("group_move", "Group move")
	action_button("end_group_move", "End group move")
	action_button("muster", "Muster")
	action_button("end_muster", "End muster")
	action_button("end_retreat", "End retreat")
	action_button("end_regroup", "End regroup")
	action_button("end_move_phase", "End move phase")
	action_button("pass", "Pass")
	action_button("next", "Next")
	action_button("undo", "Undo")

	document.getElementById("frank_vp").textContent = view.f_vp
	document.getElementById("saracen_vp").textContent = view.s_vp

	update_cards()
	update_map()

	if (view.battle) {
		document.getElementById("battle_header").textContent = view.battle.title
		document.getElementById("battle_message").textContent = view.battle.flash
		if (view.flash_next)
			start_flash()
		document.getElementById("battle").classList.add("show")
		update_battle()
	} else {
		document.getElementById("battle").classList.remove("show")
	}
}

build_map()

drag_element_with_mouse("#battle", "#battle_header")
scroll_with_middle_mouse("main", 3)