'use strict';

const test = require('node:test');
const assert = require('node:assert/strict');
const { EventEmitter } = require('node:events');
const { Controller, sharpCoverUrl } = require('../src/controller');
const { PlaytubeError } = require('../src/playtubeClient');
const { PREFIX } = require('../src/actions');

const silentLogger = { info() {}, warn() {}, error() {} };
const tick = (ms = 5) => new Promise((resolve) => setTimeout(resolve, ms));

const STATE = {
  activeTab: 'music',
  visibleTab: 'music',
  tabs: {
    music: { playing: true, title: 'Song', volume: 40, muted: false, likeStatus: 'none', repeatMode: 'NONE',
      hasVideo: true, thumbnail: 'https://example.test/x=w60-h60-l90' },
    youtube: { playing: false, title: '', volume: 100, muted: false },
  },
};

class FakeHost extends EventEmitter {
  constructor() {
    super();
    this.calls = [];
    for (const name of ['setTitle', 'setImage', 'setState', 'showAlert', 'showOk', 'sendToPropertyInspector']) {
      this[name] = (...args) => this.calls.push([name, ...args]);
    }
  }

  named(name) { return this.calls.filter((call) => call[0] === name); }
}

class FakeClient extends EventEmitter {
  constructor() {
    super();
    this.connected = true;
    this.requests = [];
    this.state = STATE;
    this.failWith = null;
    this.playlists = [{ id: 'LM', title: 'Liked' }];
  }

  start() {}
  stop() {}
  async request(cmd, fields) {
    if (this.failWith) throw this.failWith;
    this.requests.push({ cmd, ...fields });
    return { ok: true };
  }
  async status() { return this.state; }
  async listPlaylists() { return this.playlists; }
}

function setup() {
  const host = new FakeHost();
  const client = new FakeClient();
  const covers = [];
  const controller = new Controller({
    host, client, logger: silentLogger, pollIntervalMs: 100000,
    fetchImage: async (url) => { covers.push(url); return `data:image/jpeg;base64,${Buffer.from(url).toString('base64')}`; },
  });
  return { host, client, controller, covers };
}

const appear = (controller, id, context = `ctx-${id}`, settings = {}) => controller.handleEvent({
  event: 'willAppear', action: `${PREFIX}${id}`, context, payload: { settings },
});

test('sharpCoverUrl hebt die Aufloesung von Music-Covern auf Tastengroesse', () => {
  assert.equal(sharpCoverUrl('https://x/a=w60-h60-l90-rj'), 'https://x/a=w144-h144-l90-rj');
  assert.equal(sharpCoverUrl('https://i.ytimg.com/vi/abc/hq.jpg'), 'https://i.ytimg.com/vi/abc/hq.jpg');
});

test('Taste erscheint offline: Offline-Titel', () => {
  const { host, client, controller } = setup();
  client.connected = false;
  appear(controller, 'playpause', 'k1', { showTitle: true });
  assert.match(host.named('setTitle')[0][2], /offline/);
});

test('Lauter: sofort beim Druecken, Wiederholung beim Halten, Stopp beim Loslassen', async () => {
  const { client, controller } = setup();
  appear(controller, 'volumeup', 'v1', { step: 3 });
  controller.handleEvent({ event: 'keyDown', context: 'v1' });
  await tick();
  assert.equal(client.requests.length, 1);
  assert.deepEqual(client.requests[0], { cmd: 'volume_change', target: 'auto', value: 3 });
  assert.ok(controller.repeaters.has('v1'));
  controller.handleEvent({ event: 'keyUp', context: 'v1' });
  assert.equal(controller.repeaters.size, 0);
  await tick();
  assert.equal(client.requests.length, 1);
});

test('normale Aktionen laufen beim Loslassen, nicht beim Druecken', async () => {
  const { client, controller } = setup();
  appear(controller, 'next', 'n1');
  controller.handleEvent({ event: 'keyDown', context: 'n1' });
  await tick();
  assert.equal(client.requests.length, 0);
  controller.handleEvent({ event: 'keyUp', context: 'n1' });
  await tick();
  assert.deepEqual(client.requests, [{ cmd: 'next', target: 'auto' }]);
});

test('Fehler von Playtube loesen einen Alarm auf der Taste aus', async () => {
  const { host, client, controller } = setup();
  client.failWith = new PlaytubeError('not_connected', 'offline');
  appear(controller, 'next', 'n1');
  controller.handleEvent({ event: 'keyUp', context: 'n1' });
  await tick();
  assert.equal(host.named('showAlert').length, 1);
});

test('Playlist-Taste ohne Auswahl zeigt Alarm und sendet nichts', async () => {
  const { host, client, controller } = setup();
  appear(controller, 'playlist', 'p1');
  controller.handleEvent({ event: 'keyUp', context: 'p1' });
  await tick();
  assert.equal(client.requests.length, 0);
  assert.equal(host.named('showAlert').length, 1);
});

test('Playlist-Taste startet die gewaehlte Playlist und zeigt ihren Namen', async () => {
  const { host, client, controller } = setup();
  appear(controller, 'playlist', 'p1', { playlistId: 'PLabc', playlistTitle: 'Mein Mix' });
  assert.equal(host.named('setTitle').at(-1)[2], 'Mein Mix');
  controller.handleEvent({ event: 'keyUp', context: 'p1' });
  await tick();
  assert.deepEqual(client.requests, [{ cmd: 'play_playlist', playlist: 'PLabc' }]);
});

test('Status aktualisiert Zustand und Lautstaerke-Anzeige, nur bei Aenderung', async () => {
  const { host, controller } = setup();
  appear(controller, 'playpause', 'pp');
  appear(controller, 'volumeup', 'vu');
  await controller.poll();
  assert.deepEqual(host.named('setState').filter((c) => c[1] === 'pp').at(-1), ['setState', 'pp', 1]);
  assert.equal(host.named('setTitle').filter((c) => c[1] === 'vu').at(-1)[2], '40%');
  const before = host.calls.length;
  await controller.poll();
  assert.equal(host.calls.length, before, 'unveraenderter Status sendet nichts erneut');
});

test('Cover wird in hoher Aufloesung geladen und als Bild gesetzt', async () => {
  const { host, controller, covers } = setup();
  appear(controller, 'nowplaying', 'np');
  await controller.poll();
  await tick(20);
  assert.deepEqual(covers, ['https://example.test/x=w144-h144-l90']);
  const image = host.named('setImage').at(-1);
  assert.equal(image[1], 'np');
  assert.match(image[2], /^data:image\/jpeg;base64,/);
});

test('Verbindungsverlust stellt Offline-Anzeige her', async () => {
  const { host, client, controller } = setup();
  controller.start();
  appear(controller, 'volumeup', 'vu');
  await controller.poll();
  assert.equal(host.named('setTitle').filter((c) => c[1] === 'vu').at(-1)[2], '40%');
  client.connected = false;
  client.emit('disconnected');
  assert.equal(host.named('setTitle').filter((c) => c[1] === 'vu').at(-1)[2], '');
  controller.stop();
});

test('Property Inspector bekommt die Playlists', async () => {
  const { host, controller } = setup();
  controller.handleEvent({ event: 'sendToPlugin', action: `${PREFIX}playlist`, context: 'p1',
    payload: { command: 'requestPlaylists' } });
  await tick();
  const [, action, context, payload] = host.named('sendToPropertyInspector')[0];
  assert.equal(action, `${PREFIX}playlist`);
  assert.equal(context, 'p1');
  assert.deepEqual(payload, { command: 'playlists', ok: true, playlists: [{ id: 'LM', title: 'Liked' }] });
});

test('Property Inspector: offline und Fehler werden gemeldet', async () => {
  const { host, client, controller } = setup();
  client.connected = false;
  controller.handleEvent({ event: 'sendToPlugin', action: 'a', context: 'c', payload: { command: 'requestPlaylists' } });
  await tick();
  assert.equal(host.named('sendToPropertyInspector')[0][3].error, 'offline');

  client.connected = true;
  client.listPlaylists = async () => { throw new PlaytubeError('remote', 'unbekannter Befehl'); };
  controller.handleEvent({ event: 'sendToPlugin', action: 'a', context: 'c', payload: { command: 'requestPlaylists' } });
  await tick();
  const payload = host.named('sendToPropertyInspector')[1][3];
  assert.equal(payload.ok, false);
  assert.equal(payload.error, 'remote');
});

test('willDisappear raeumt Taste und Wiederholung auf', () => {
  const { controller } = setup();
  appear(controller, 'volumeup', 'v1');
  controller.handleEvent({ event: 'keyDown', context: 'v1' });
  controller.handleEvent({ event: 'willDisappear', context: 'v1' });
  assert.equal(controller.keys.size, 0);
  assert.equal(controller.repeaters.size, 0);
});