"use strict";

const kWidth = 15;
const kHeight = 10;

class Client {
	async start() {
		let self = this;
		terminal.setTitle("Xmas 2016");
		terminal.setSendKeyEvents(true);
		terminal.split([{name: "terminal", style: "text-align: center"}]);
		self.send({action: "ready"});

		core.register("key", function(event) {
			if (event.type == "keydown") {
				switch (event.keyCode) {
					case 37:
						self.requestMove(-1, 0);
						break;
					case 38:
						self.requestMove(0, -1);
						break;
					case 39:
						self.requestMove(1, 0);
						break;
					case 40:
						self.requestMove(0, 1);
						break;
				}
			}
		});

		core.register("onMessage", function(sender, message) {
			if (message.action == "display") {
				terminal.cork();
				terminal.clear();
				terminal.print(message.board);
				terminal.uncork();
			}
		});
	}

	async send(message) {
		(await core.getService("server")).postMessage(message);
	}

	async requestMove(dx, dy) {
		this.send({action: "move", delta: [dx, dy]});
	}
}

class Server {
	constructor() {
		this.players = {};
	}

	async start() {
		let self = this;
		core.register("onMessage", function(sender, message) {
			if (!self.players[sender.index]) {
				self.players[sender.index] = [Math.floor(Math.random() * 8) + 1, 8];
			}
			switch (message.action) {
				case "move":
					self.move(sender.index, message.delta);
					self.redisplay();
					break;
				case "ready":
					self.redisplay();
					break;
			}
		});
		core.register("onSessionEnd", function(session) {
			delete self.players[session.index];
			self.redisplay();
		});
	}

	occupied(position) {
		if (position[0] < 1 || position[1] < 1 || position[0] >= kWidth - 1 || position[1] >= kHeight - 1) {
			return true;
		}

		if (Object.values(this.players).some(x => position[0] == x[0] && position[1] == x[1])) {
			return true;
		}
	}

	move(index, delta) {
		let newPosition = [
			this.players[index][0] + delta[0],
			this.players[index][1] + delta[1],
		];
		let pushPosition = [
			this.players[index][0] + 2 * delta[0],
			this.players[index][1] + 2 * delta[1],
		];
		if (!this.occupied(newPosition)) {
			this.players[index] = newPosition;
		} else if (this.occupied(newPosition) && !this.occupied(pushPosition)) {
			for (var i in this.players) {
				if (this.players[i][0] == newPosition[0] && this.players[i][1] == newPosition[1]) {
					this.players[i] = pushPosition;
				}
			}
			this.players[index] = newPosition;
		}
	}

	redisplay() {
		core.broadcast({action: "display", board: this.getBoard()});
	}

	getBoard() {
		let board = [
			"┌─────────────┐",
			"│      .      │",
			"│     .#.     │",
			"│    .%##.    │",
			"│   .##%##.   │",
			"│  .%###%##.  │",
			"│ .##%###%##. │",
			"│.#%##%###%##.│",
			"│      |      │",
			"└─────────────┘",
		];
		let merry = false;
		let colors = board.map(x => x.split("").map(y => '#fff'));
		for (let i in this.players) {
			let player = this.players[i];
			merry = merry || (player[0] == 7 && player[1] == 1);
			let character = player[0] == 7 && player[1] == 1 ? '*' : '@';
			board[player[1]] = board[player[1]].slice(0, player[0]) + character + board[player[1]].slice(player[0] + 1);
		}
		if (merry) {
			for (let i = 0; i < colors.length; i++) {
				for (let j = 0; j < colors[i].length; j++) {
					switch (board[i].charAt(j)) {
						case '#':
						case '.':
							colors[i][j] = '#080';
							break;
						case '%':
							colors[i][j] = '#f00';
							break;
						case '|':
							colors[i][j] = '#880';
							break;
						case '*':
							colors[i][j] = '#ff0';
							break;
						case '@':
							{
								const palette = ['#f88', '#8f8', '#88f', '#fff'];
								colors[i][j] = palette[(i * colors.length + j) % palette.length];
							}
							break;
					}
				}
			}
		}
		let result = board.map((r, row) => r.split("").map((v, column) => ({style: "color: " + colors[row][column], value: v})).concat(["\n"]));
		if (merry) {
			result.push("Merry Christmas!");
		} else {
			result.push("use ←↑→↓");
		}
		return result;
	}
}

if (imports.terminal) {
	new Client().start().catch(terminal.print);
} else {
	new Server().start().catch(print);
}