import { afterEach, beforeEach, describe, expect, setSystemTime, test } from 'bun:test';
import { mkdtemp, readFile, rm, writeFile } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { tournamentConfig } from '../tourney';
import type { Follow } from '../link';
import type { OcrLine } from './desktop';
import { FakeDesktop, fakeTosu, tourneyFrame, windowInfo } from './fakes';
import {
	findRoomLine,
	parseRoomName,
	pickManagerWindow,
	savedLogin,
	teamsMatch,
	TourneyController
} from './tourney';

const line = (text: string, y: number): OcrLine => ({ text, x: 10, y, width: 600, height: 30 });

describe('room names and matching', () => {
	test('parses the acronym and both team names', () => {
		expect(parseRoomName('VASH: (Red Team) vs (Blue: Team)')).toEqual({
			acronym: 'VASH',
			teams: ['Red Team', 'Blue: Team']
		});
		expect(parseRoomName('not a tourney room')).toBeNull();
		expect(parseRoomName(null)).toBeNull();
	});

	test('finds the room by its lobby id, even with OCR look-alike letters', () => {
		const lines = [
			line('118000001 : @VASH: (Alpha) vs (Beta) () 0/16', 0),
			line('11800OO42 : @VASH: (Alpha) vs (Beta) () 2/16', 40)
		];
		const match = findRoomLine(lines, 118000042, 'VASH: (Alpha) vs (Beta)');
		expect(match).toMatchObject({ found: true, by: 'lobby id', line: { y: 40 } });
	});

	test('falls back to the room name only when exactly one room has it', () => {
		const one = [line('VASH: (Other) vs (Team)', 0), line('VASH: (Alpha) vs (Beta)', 40)];
		expect(findRoomLine(one, 5, 'VASH: (Alpha) vs (Beta)')).toMatchObject({
			found: true,
			by: 'room name',
			line: { y: 40 }
		});
		const two = [line('VASH: (Alpha) vs (Beta)', 0), line('VASH: (Alpha) vs (Beta)', 40)];
		const ambiguous = findRoomLine(two, 5, 'VASH: (Alpha) vs (Beta)');
		expect(ambiguous.found).toBe(false);
		expect(ambiguous.found || ambiguous.reason).toContain('2 rooms are named');
		expect(
			findRoomLine([line('Make a multiplayer room with format:', 0)], 5, 'VASH: (A) vs (B)')
		).toMatchObject({
			found: false,
			reason: 'the room is not listed yet'
		});
	});

	test('confirms the room from the team names tosu reads', () => {
		expect(teamsMatch({ left: 'Alpha', right: 'Beta' }, 'VASH: (Alpha) vs (Beta)')).toBe(true);
		expect(teamsMatch({ left: 'beta', right: 'ALPHA' }, 'VASH: (Alpha) vs (Beta)')).toBe(true);
		expect(teamsMatch({ left: 'Alpha', right: 'Gamma' }, 'VASH: (Alpha) vs (Beta)')).toBe(false);
		expect(teamsMatch({ left: '', right: '' }, 'VASH: ( ) vs ( )')).toBe(false);
		expect(teamsMatch(null, 'VASH: (Alpha) vs (Beta)')).toBe(false);
	});

	test('picks the manager window (control panel below 16:9), not a spectator window', () => {
		const spectator = windowInfo({ hwnd: 1, clientWidth: 640, clientHeight: 360 });
		const manager = windowInfo({ hwnd: 2, clientWidth: 1280, clientHeight: 920 });
		const hidden = windowInfo({ hwnd: 3, clientWidth: 1920, clientHeight: 1300, visible: false });
		expect(pickManagerWindow([spectator, hidden, manager])?.hwnd).toBe(2);
		expect(pickManagerWindow([spectator])).toBeNull();
	});

	test('reads a remembered login from osu!.<user>.cfg', () => {
		expect(savedLogin('Username = spectator\r\nPassword = AQAAANCM\r\nSavePassword = 1')).toEqual({
			username: 'spectator',
			saved: true
		});
		expect(savedLogin('Username = spectator\nPassword = \n')).toEqual({
			username: 'spectator',
			saved: false
		});
		expect(savedLogin('')).toEqual({ username: null, saved: false });
	});

	test('tournament.cfg keeps other keys and sets ours', () => {
		expect(
			tournamentConfig('privateserver = 0\r\nTeamSize = 4\r\nacronym = OWC\r\n', {
				teamSize: 2,
				height: 720,
				acronym: 'VASH'
			})
		).toBe('privateserver = 0\nTeamSize = 2\nacronym = VASH\nHeight = 720\n');
	});
});

describe('TourneyController', () => {
	let dir: string;
	let desktop: FakeDesktop;
	let tosu: ReturnType<typeof fakeTosu>;
	let launches: number;
	let tourney: TourneyController;
	let now: number;
	const advance = (ms: number) => {
		now += ms;
		setSystemTime(new Date(now));
	};
	const follow = (overrides: Partial<Follow> = {}): Follow => ({
		scene: 'gameplay',
		matchId: 'm1',
		lobbyId: 118000042,
		roomName: 'VASH: (Alpha) vs (Beta)',
		teamSize: 2,
		title: 'Alpha vs Beta',
		...overrides
	});

	beforeEach(async () => {
		now = Date.parse('2026-09-29T12:00:00Z');
		setSystemTime(new Date(now));
		dir = await mkdtemp(join(tmpdir(), 'vash-tourney-'));
		await writeFile(join(dir, 'osu!.stan.cfg'), 'Username = spectator\nPassword = secret\n');
		desktop = new FakeDesktop();
		tosu = fakeTosu();
		launches = 0;
		tourney = new TourneyController({
			osuDir: dir,
			snapshots: join(dir, 'snapshots'),
			height: 720,
			windowTitle: 'Vash osu!tourney (test)',
			desktop,
			tosu,
			log: () => {},
			launch: () => {
				launches++;
				desktop.running.push({ pid: 10 + launches, path: join(dir, 'osu!.exe') });
			}
		});
	});

	afterEach(async () => {
		setSystemTime();
		await rm(dir, { recursive: true, force: true });
	});

	test('launches with the match team size, selects the room by lobby id and confirms it', async () => {
		tourney.follow(follow());
		await tourney.tick(desktop.sessionInfo);
		expect(launches).toBe(1);
		expect(tourney.state).toBe('starting');
		expect(await readFile(join(dir, 'tournament.cfg'), 'utf8')).toBe(
			'TeamSize = 2\nacronym = VASH\nHeight = 720\n'
		);

		desktop.windowList = [windowInfo({ pid: 11 })];
		await tourney.tick(desktop.sessionInfo);
		expect(desktop.called('title')[0].args).toEqual([100, 'Vash osu!tourney (test)']);
		expect(desktop.called('click')).toHaveLength(0);

		advance(9000);
		desktop.ocrLines = [
			line('118000001 : @VASH: (Other) vs (Team) () 0/16', 20),
			line('118000042 : @VASH: (Alpha) vs (Beta) () 2/16', 60)
		];
		await tourney.tick(desktop.sessionInfo);
		// Panel at client (8, 31 + 720), captured at 2.5×: the second line's start.
		expect(desktop.called('click')[0].args).toEqual([52, 781]);
		expect(tourney.state).toBe('selecting');
		expect(tourney.verified).toBe(false);

		tosu.frame = tourneyFrame('Alpha', 'Beta');
		advance(2000);
		await tourney.tick(desktop.sessionInfo);
		expect(tourney.state).toBe('spectating');
		expect(tourney.verified).toBe(true);
	});

	test('restarts osu!tourney for a different team size, and not for an idle channel', async () => {
		tourney.follow(follow());
		await tourney.tick(desktop.sessionInfo);
		desktop.windowList = [windowInfo({ pid: 11 })];
		tourney.follow(
			follow({ matchId: null, lobbyId: null, roomName: null, teamSize: null, title: null })
		);
		await tourney.tick(desktop.sessionInfo);
		expect(launches).toBe(1);
		expect(tourney.state).toBe('idle');

		tourney.follow(follow({ lobbyId: 5, teamSize: 1, roomName: 'VASH: (C) vs (D)' }));
		await tourney.tick(desktop.sessionInfo);
		expect(desktop.called('close')).toHaveLength(1);
		expect(launches).toBe(2);
		expect(await readFile(join(dir, 'tournament.cfg'), 'utf8')).toContain('TeamSize = 1');
	});

	test('does not click while Windows is locked', async () => {
		tourney.follow(follow());
		await tourney.tick(desktop.sessionInfo);
		desktop.windowList = [windowInfo({ pid: 11 })];
		await tourney.tick(desktop.sessionInfo);
		advance(9000);
		desktop.sessionInfo = { ...desktop.sessionInfo, inputDesktop: 'Winlogon' };
		await tourney.tick(desktop.sessionInfo);
		expect(tourney.state).toBe('desktop-locked');
		expect(desktop.called('click')).toHaveLength(0);
	});

	test('selects again when tosu shows a different room after the click', async () => {
		tourney.follow(follow());
		await tourney.tick(desktop.sessionInfo);
		desktop.windowList = [windowInfo({ pid: 11 })];
		await tourney.tick(desktop.sessionInfo);
		advance(9000);
		desktop.ocrLines = [line('118000042 : @VASH: (Alpha) vs (Beta) () 2/16', 60)];
		await tourney.tick(desktop.sessionInfo);
		expect(desktop.called('click')).toHaveLength(1);

		tosu.frame = tourneyFrame('Other', 'Team');
		advance(5000);
		await tourney.tick(desktop.sessionInfo);
		expect(tourney.state).toBe('selecting');
		advance(13_000);
		await tourney.tick(desktop.sessionInfo);
		expect(tourney.verified).toBe(false);
		advance(11_000);
		await tourney.tick(desktop.sessionInfo);
		expect(desktop.called('click')).toHaveLength(2);
	});

	test('waits for the room when it is not listed, and never clicks another room', async () => {
		tourney.follow(follow());
		await tourney.tick(desktop.sessionInfo);
		desktop.windowList = [windowInfo({ pid: 11 })];
		await tourney.tick(desktop.sessionInfo);
		advance(9000);
		desktop.ocrLines = [line('118000001 : @VASH: (Other) vs (Team) () 0/16', 20)];
		await tourney.tick(desktop.sessionInfo);
		expect(tourney.state).toBe('waiting-for-lobby');
		expect(tourney.detail).toContain('1 room listed');
		expect(desktop.called('click')).toHaveLength(0);
	});

	test('asks for the one-time sign-in instead of launching without a saved login', async () => {
		await writeFile(join(dir, 'osu!.stan.cfg'), 'Username = \n');
		tourney.follow(follow());
		await tourney.tick(desktop.sessionInfo);
		expect(tourney.state).toBe('login-required');
		expect(launches).toBe(0);
	});
});