1 files changed, 116 insertions, 0 deletions
diff --git a/rules.js b/rules.js
new file mode 100644
index 0000000..52bdd63
--- /dev/null
+++ b/rules.js
@@ -0,0 +1,116 @@
+"use strict"
+
+const P1 = "Red"
+const P2 = "Blue"
+const P3 = "Yellow"
+const P4 = "Green"
+
+const player_names = [ P1, P2, P3, P4 ]
+
+const player_names_by_scenario = {
+	"4P": [ P1, P2, P3, P4 ],
+	"3P": [ P1, P2, P3 ],
+	"2P": [ P1, P2 ],
+}
+
+const scenario_player_count = {
+	"4P": 4,
+	"3P": 3,
+	"2P": 2,
+}
+
+const player_index = {
+	[P1]: 0,
+	[P2]: 1,
+	[P3]: 2,
+	[P4]: 3,
+	"Observer": -1,
+}
+
+var game
+var view
+
+const states = {}
+
+exports.scenarios = [ "Standard" ]
+
+exports.roles = function (scenario, options) {
+	if (options.players == 2)
+		return [ P1, P2 ]
+	if (options.players == 3)
+		return [ P1, P2, P3 ]
+	return [ P1, P2, P3, P4 ]
+}
+
+exports.setup = function (seed, scenario, options) {
+	let players = options.players || 4
+	game = {
+		seed: seed,
+		log: [],
+		undo: [],
+		players: players,
+		active: 0,
+		state: "none",
+	}
+	return save_game()
+}
+
+function load_game(state) {
+	game = state
+	game.active = player_index[game.active]
+}
+
+function save_game() {
+	game.active = player_names[game.active]
+	return game
+}
+
+exports.action = function (state, player, 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.view = function (state, player_name) {
+	let player = player_index[player_name]
+
+	load_game(state)
+
+	view = {
+		log: game.log,
+		active: player_names[game.active],
+		prompt: null,
+	}
+
+	if (game.state === "game_over") {
+		view.prompt = game.victory
+	} else if (game.active !== player) {
+		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
+}
+
+// STATES
+
+states.none = {
+	prompt() {}
+}