import { appendFileSync, mkdtempSync, rmSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { game, type Input, type State } from '../../src/lib/game';
import { square } from '../../src/lib/game/board';
import type { GameSpec } from '../../src/lib/game/spec';
import { Rooms } from './rooms';
import { Store } from './store';
import { SPECTATOR } from '../../src/lib/game/spec';

let dir: string;
beforeEach(() => {
	dir = mkdtempSync(join(tmpdir(), 'rooms-'));
});
afterEach(() => {
	rmSync(dir, { recursive: true, force: true });
});

/** Gold's first Warrior step and Scarlet's answer. */
const GOLD_OPENS: Input = { from: square('2c2'), to: square('2c3') };
const SCARLET_ANSWERS: Input = { from: square('2c7'), to: square('2c6') };

/** The bots move once the request that made their move due has been answered: after this tick. */
const answered = () => new Promise<void>((r) => setImmediate(r));

/** A table of two: Ann, who opened it and plays Gold, and Bo, the game begun. */
function table(spec: GameSpec<State, Input> = game) {
	const rooms = new Rooms(spec, new Store(dir));
	const host = rooms.create('Ann', 2);
	const guest = rooms.join(host.room, 'Bo');
	rooms.begin(host.room, host.token);
	return { rooms, room: host.room, ann: host.token, bo: guest.token };
}

describe('rooms', () => {
	it('plays a move as soon as the side to move sends it, and refuses one for a round already played', () => {
		const { rooms, room, ann, bo } = table();
		expect(rooms.waitingOn(room)).toEqual(['A']);
		expect(() => rooms.submit(room, bo, SCARLET_ANSWERS, 0)).toThrow(/not your move/);
		rooms.submit(room, ann, GOLD_OPENS, 0);
		expect(room.resolved).toBe(1);
		expect(rooms.waitingOn(room)).toEqual(['B']);
		expect(() => rooms.submit(room, ann, GOLD_OPENS, 0)).toThrow(/already been played/);
		rooms.submit(room, bo, SCARLET_ANSWERS, 1);
		expect(room.resolved).toBe(2);
		expect(room.state!.moves).toHaveLength(2);
	});

	it('refuses a move the rules refuse, with the reason', () => {
		const { rooms, room, ann } = table();
		expect(() => rooms.submit(room, ann, { from: square('2c2'), to: square('2c4') }, 0)).toThrow(/Warrior cannot go to 2c4/);
		expect(() => rooms.submit(room, ann, { from: square('2c7'), to: square('2c6') }, 0)).toThrow(/not one of your pieces/);
	});

	it("puts the keeper's word in the table's talk though the gallery may not talk, and a restart keeps it", () => {
		const { rooms, room } = table();
		expect(room.galleryTalk).toBe(false);
		rooms.keeperSays(room, 'I came too late for the seat; call me again.');
		const said = { id: SPECTATOR, name: 'the keeper', keeper: true, text: 'I came too late for the seat; call me again.' };
		expect(room.chat.at(-1)).toMatchObject(said);
		expect(new Rooms(game, new Store(dir)).get(room.id).chat.at(-1)).toMatchObject(said);
	});

	it("gives a seat a new token at the keeper's word: the old one opens nothing, and a restart keeps the change", () => {
		const { rooms, room, bo } = table();
		const phrase = rooms.transfer(room, bo).phrase;
		const { seat, token } = rooms.reseat(room, 'B');
		expect(seat.name).toBe('Bo');
		expect(rooms.seatOf(room, token).id).toBe('B');
		expect(() => rooms.seatOf(room, bo)).toThrow(/opens no seat/);
		// A phrase minted with the old token carries nothing now.
		expect(() => rooms.claim(phrase)).toThrow(/unknown or has expired/);
		const reopened = new Rooms(game, new Store(dir)).get(room.id);
		expect(rooms.seatOf(reopened, token).id).toBe('B');
		expect(() => rooms.seatOf(reopened, bo)).toThrow(/opens no seat/);
	});

	it('re-seats only a person, and says when each person last acted', () => {
		const { rooms, room, ann } = table();
		expect(() => rooms.reseat(room, 'Z')).toThrow(/No person sits/);
		rooms.submit(room, ann, GOLD_OPENS, 0);
		const seats = rooms.seatsForKeeper(room);
		expect(seats.map((s) => [s.id, s.name])).toEqual([['A', 'Ann'], ['B', 'Bo']]);
		expect(seats[0].lastActed).toBeGreaterThan(0);
		expect(seats[1].lastActed).toBeNull();
	});

	it('replays a game from its ledger to the same position after a restart', () => {
		const { rooms, room, ann, bo } = table();
		rooms.submit(room, ann, GOLD_OPENS, 0);
		rooms.submit(room, bo, SCARLET_ANSWERS, 1);
		const reopened = new Rooms(game, new Store(dir)).get(room.id);
		expect(reopened.state!.cells).toEqual(room.state!.cells);
		expect(reopened.state!.toMove).toBe('gold');
		expect(reopened.resolved).toBe(2);
	});

	it('leaves a room with an unreadable ledger unloaded and opens the rest', () => {
		const { room } = table();
		appendFileSync(join(dir, 'ZZZZ.jsonl'), '{"t":"room","id":"ZZZZ","seats":2,"createdAt":1,"options":{}}\n{"t":"seat", torn');
		const errors = vi.spyOn(console, 'error').mockImplementation(() => {});
		const reopened = new Rooms(game, new Store(dir));
		expect(errors).toHaveBeenCalledWith(expect.stringMatching(/ZZZZ: ledger unreadable/));
		expect(reopened.get(room.id).state).not.toBeNull();
		errors.mockRestore();
	});

	it("shows a seat its last move played, and nobody else's", () => {
		const { rooms, room, ann } = table();
		rooms.submit(room, ann, GOLD_OPENS, 0);
		expect(rooms.view(room, 'A').yourInput).toBeNull();
		expect(rooms.view(room, 'A').yourLastInput).toEqual(GOLD_OPENS);
		expect(rooms.view(room, 'B').yourLastInput).toBeNull();
		expect(rooms.view(room, '').yourLastInput).toBeNull();
	});

	it('shows a private line to its sender and the seat it names, never to the gallery', () => {
		const { rooms, room, ann, bo } = table();
		rooms.say(room, ann, 'Everyone, hello.');
		rooms.say(room, ann, 'Bo, mind your Dragon.', ['B']);
		const heard = (seat: string) => rooms.view(room, seat).chat.map((l) => l.text);
		expect(heard('A')).toEqual(['Everyone, hello.', 'Bo, mind your Dragon.']);
		expect(heard('B')).toEqual(['Everyone, hello.', 'Bo, mind your Dragon.']);
		expect(heard('')).toEqual(['Everyone, hello.']);
		expect(rooms.view(room, 'B').chat[1]).toMatchObject({ id: 'A', to: ['B'], turn: 1 });
		expect(() => rooms.say(room, bo, 'Anyone?', ['Q'])).toThrow(/Nobody at this table/);
	});

	it('seats the host on the side they chose, and a drake across from them, which moves once the host has been answered', async () => {
		const rooms = new Rooms(game, new Store(dir));
		const host = rooms.create('Ann', 2, { side: 'scarlet', setup: 'shifted' });
		const bot = rooms.addBot(host.room, host.token);
		expect(game.botNames).toContain(bot.name);
		rooms.begin(host.room, host.token);
		expect(host.room.state!.players.A.side).toBe('scarlet');
		expect(host.room.state!.players.B.side).toBe('gold');
		expect(host.room.state!.setup).toBe('shifted');
		// Gold moves first, and Gold is the drake: it moves once the host's request has been answered, not inside it.
		expect(host.room.state!.moves).toHaveLength(0);
		await answered();
		expect(host.room.state!.moves).toHaveLength(1);
		expect(rooms.waitingOn(host.room)).toEqual(['A']);
	});

	it('refuses a ranking at a table that asks for none', () => {
		const rooms = new Rooms(game, new Store(dir));
		const host = rooms.create('Ann', 2);
		expect(() => rooms.rank(host.room, host.token, ['A'])).toThrow(/asks for no ranking/);
	});

	it('refuses private talk to a drake, which reads none', () => {
		const rooms = new Rooms(game, new Store(dir));
		const host = rooms.create('Ann', 2);
		rooms.addBot(host.room, host.token);
		rooms.begin(host.room, host.token);
		expect(() => rooms.say(host.room, host.token, 'Psst.', ['B'])).toThrow(/read no private talk/);
	});

	describe('a table the bots play on alone', () => {
		/** A count to ten that only the bots play: the host is never owed a move. */
		type Count = { n: number; over: { winner: null; reason: string } | null };
		const count: GameSpec<Count, null> = {
			seatIds: ['A', 'B'],
			minSeats: 2,
			botNames: ['Aldric'],
			currentRules: 1,
			create: () => ({ n: 0, over: null }),
			resolve: (s) => ({ n: s.n + 1, over: s.n + 1 >= 10 ? { winner: null, reason: 'Ten.' } : null }),
			needsInput: (s, seat) => seat === 'B' && !s.over,
			over: (s) => s.over,
			turn: (s) => s.n + 1,
			view: (s) => s,
			botInput: () => null,
			cleanInput: () => null,
			nameOf: (_s, seat) => seat
		};

		beforeEach(() => vi.useFakeTimers());
		afterEach(() => vi.useRealTimers());

		it('plays a few rounds at once, then one at a pace to watch, and the rest at once when hurried', () => {
			const rooms = new Rooms(count, new Store(dir));
			const host = rooms.create('Ann', 2);
			rooms.addBot(host.room, host.token);
			rooms.begin(host.room, host.token);
			const room = host.room;
			vi.runOnlyPendingTimers();
			expect(room.state!.n).toBe(4);
			expect(rooms.view(room, 'A').playingOn).toBe(true);
			vi.advanceTimersByTime(2000);
			expect(room.state!.n).toBe(5);
			rooms.hurry(room, host.token);
			vi.runAllTimers();
			expect(room.state!.n).toBe(10);
			expect(room.over).toBe(true);
			expect(rooms.view(room, 'A').playingOn).toBe(false);
		});
	});
});

describe('the host and the other seats', () => {
	it("gives a person's seat to a drake, which plays it at once, and the person's token opens nothing", async () => {
		const { rooms, room, ann, bo } = table();
		rooms.submit(room, ann, GOLD_OPENS, 0);
		rooms.standIn(room, ann, 'B');
		// The move was Bo's; the drake makes it as soon as the host has been answered.
		await answered();
		expect(room.resolved).toBe(2);
		expect(rooms.waitingOn(room)).toEqual(['A']);
		expect(() => rooms.seatOf(room, bo)).toThrow(/gave your seat to a drake/);
		expect(rooms.view(room, 'A').seats[1]).toEqual({ id: 'B', name: 'Bo', bot: true, standIn: true });
		rooms.submit(room, ann, { from: square('2d2'), to: square('2d3') }, 2);
		await answered();
		expect(room.resolved).toBe(4);
	});

	it("is the host's call alone, in a game under way, for a person other than the host", () => {
		const { rooms, room, ann, bo } = table();
		expect(() => rooms.standIn(room, bo, 'A')).toThrow(/Only the player who opened/);
		expect(() => rooms.standIn(room, ann, 'A')).toThrow(/keeps their own seat/);
		expect(() => rooms.standIn(room, ann, 'Z')).toThrow(/No person sits/);
		const lobby = rooms.create('Ann', 2);
		rooms.join(lobby.room, 'Bo');
		expect(() => rooms.standIn(lobby.room, lobby.token, 'B')).toThrow(/under way/);
	});

	it("gives the seat back by the host's phrase, with a new token, and a restart keeps both changes", () => {
		const { rooms, room, ann, bo } = table();
		rooms.submit(room, ann, GOLD_OPENS, 0);
		rooms.standIn(room, ann, 'B');
		expect(new Rooms(game, new Store(dir)).get(room.id).seats[1]).toMatchObject({ bot: true, standIn: true });
		const claimed = rooms.claim(rooms.hostPhrase(room, ann, 'B').phrase);
		expect(claimed.seat).toBe('B');
		expect(rooms.seatOf(room, claimed.token).name).toBe('Bo');
		expect(() => rooms.seatOf(room, bo)).toThrow(/opens no seat/);
		const reopened = new Rooms(game, new Store(dir)).get(room.id);
		expect(reopened.seats[1]).toEqual({ id: 'B', name: 'Bo', tokenHash: room.seats[1].tokenHash, bot: false });
	});

	it("re-seats a person whose browser lost the seat, by the host's phrase, once", () => {
		const { rooms, room, ann, bo } = table();
		const { phrase } = rooms.hostPhrase(room, ann, 'B');
		const claimed = rooms.claim(phrase);
		expect(claimed.token).not.toBe(bo);
		expect(() => rooms.seatOf(room, bo)).toThrow(/opens no seat/);
		expect(() => rooms.claim(phrase)).toThrow(/unknown or has expired/);
	});

	it("makes a phrase only for the host, and only for another person's seat", () => {
		const { rooms, room, ann, bo } = table();
		expect(() => rooms.hostPhrase(room, bo, 'A')).toThrow(/Only the player who opened/);
		expect(() => rooms.hostPhrase(room, ann, 'A')).toThrow(/No other person/);
		const withBot = rooms.create('Ann', 2);
		const bot = rooms.addBot(withBot.room, withBot.token);
		expect(() => rooms.hostPhrase(withBot.room, withBot.token, bot.id)).toThrow(/No other person/);
	});

	it('voids a phrase for the seat once a drake stands in', () => {
		const { rooms, room, ann } = table();
		const { phrase } = rooms.hostPhrase(room, ann, 'B');
		rooms.standIn(room, ann, 'B');
		expect(() => rooms.claim(phrase)).toThrow(/unknown or has expired/);
	});
});