// player.js — HLS.js wiring, live-aware ghost controls, dead-stream handling.

import { memory } from './memory.js';

const HLS_CONFIG = {
  enableWorker: true,
  lowLatencyMode: false,
  maxBufferLength: 30,
  maxMaxBufferLength: 60,
  manifestLoadingMaxRetry: 4,
  manifestLoadingRetryDelay: 800,
  fragLoadingMaxRetry: 4,
};

export class Player {
  /**
   * @param {object} els  DOM refs
   * @param {(msg:string)=>void} [onFatal]  called when a stream is unplayable
   */
  constructor(els, onFatal) {
    this.els = els;
    this.video = els.video;
    this.hls = null;
    this.onFatal = onFatal || (() => {});
    this.onFirstFrag = null;          // set by zapper to clear scrying static
    this._fallbacks = [];
    this._fallbackIdx = 0;
    this._wireControls();
    this._wireActivity();
  }

  /**
   * Play a StreamHandle (with optional fallback URLs for resilience).
   * @param {{url:string}} handle
   * @param {string[]} [fallbackUrls]
   */
  async play(handle, fallbackUrls = []) {
    this._fallbacks = [handle.url, ...fallbackUrls.filter((u) => u !== handle.url)];
    this._fallbackIdx = 0;
    this._hideNoSignal();
    this._loadCurrent();
  }

  _loadCurrent() {
    const url = this._fallbacks[this._fallbackIdx];
    if (!url) { this._showNoSignal(); this.onFatal('no playable source'); return; }
    this._teardown();

    const canNative = this.video.canPlayType('application/vnd.apple.mpegurl');
    if (window.Hls && window.Hls.isSupported()) {
      const hls = new window.Hls(HLS_CONFIG);
      this.hls = hls;
      hls.loadSource(url);
      hls.attachMedia(this.video);
      hls.on(window.Hls.Events.MANIFEST_PARSED, () => {
        this.video.play().catch(() => {});
        this._refreshLiveChrome();
        this._buildQualityMenu();
      });
      hls.on(window.Hls.Events.FRAG_BUFFERED, () => {
        if (this.onFirstFrag) { this.onFirstFrag(); }
      });
      hls.on(window.Hls.Events.ERROR, (_e, data) => {
        if (!data || !data.fatal) return;
        this._tryFallbackOrFail(`hls fatal: ${data.type}/${data.details}`);
      });
    } else if (canNative) {
      this.video.src = url;
      this.video.addEventListener('loadedmetadata', () => {
        this.video.play().catch(() => {});
        this._refreshLiveChrome();
      }, { once: true });
      this.video.addEventListener('error', () => this._tryFallbackOrFail('native hls error'), { once: true });
    } else {
      this._showNoSignal();
      this.onFatal('HLS unsupported in this browser');
    }
  }

  _tryFallbackOrFail(reason) {
    this._fallbackIdx++;
    if (this._fallbackIdx < this._fallbacks.length) {
      console.warn(`[player] ${reason} — trying fallback ${this._fallbackIdx}`);
      this._loadCurrent();
    } else {
      console.warn(`[player] ${reason} — no fallbacks left`);
      this._showNoSignal();
      this.onFatal(reason);
    }
  }

  _teardown() {
    if (this.hls) { try { this.hls.destroy(); } catch {} this.hls = null; }
    this.video.removeAttribute('src');
    try { this.video.load(); } catch {}
  }

  destroy() { this._teardown(); }

  // ---------- dead-stream "the orb clouds over" ----------
  _showNoSignal() { this.els.nosignal.hidden = false; }
  _hideNoSignal() { this.els.nosignal.hidden = true; }

  // ---------- live-aware chrome ----------
  _refreshLiveChrome() {
    const live = this._isLive();
    this.els.osdLive.hidden = !live;
    this.els.ctlLiveWrap.hidden = !live;
  }
  _isLive() {
    if (this.hls && this.hls.levels && this.hls.levels.length) {
      const d = this.hls.levels[this.hls.currentLevel]?.details;
      if (d) return d.live === true;
    }
    return !Number.isFinite(this.video.duration);
  }

  _buildQualityMenu() {
    const menu = this.els.qualMenu;
    menu.innerHTML = '';
    if (!this.hls || !this.hls.levels || this.hls.levels.length < 2) {
      this.els.btnQual.hidden = true;
      return;
    }
    this.els.btnQual.hidden = false;
    const mk = (label, levelIdx) => {
      const b = document.createElement('button');
      b.setAttribute('role', 'menuitemradio');
      b.textContent = label;
      b.setAttribute('aria-checked', String(this.hls.autoLevelEnabled ? levelIdx === -1 : this.hls.currentLevel === levelIdx));
      b.addEventListener('click', () => {
        this.hls.currentLevel = levelIdx; // -1 = auto
        this.els.btnQual.textContent = levelIdx === -1 ? 'AUTO' : label;
        menu.hidden = true;
      });
      return b;
    };
    menu.appendChild(mk('Auto', -1));
    // de-dup by height, descending
    const seen = new Set();
    this.hls.levels
      .map((l, i) => ({ h: l.height, i }))
      .filter((x) => x.h && !seen.has(x.h) && seen.add(x.h))
      .sort((a, b) => b.h - a.h)
      .forEach((x) => menu.appendChild(mk(`${x.h}p`, x.i)));
  }

  // ---------- controls ----------
  _wireControls() {
    const e = this.els;
    e.btnPlay.addEventListener('click', () => this.togglePlay());
    e.btnMute.addEventListener('click', () => this.toggleMute());
    e.vol.addEventListener('input', () => { this.video.volume = e.vol.value / 100; this.video.muted = this.video.volume === 0; this._syncMute(); });
    e.btnFull.addEventListener('click', () => this.toggleFullscreen());
    e.btnCc.addEventListener('click', () => this.toggleCaptions());
    e.btnQual.addEventListener('click', () => { e.qualMenu.hidden = !e.qualMenu.hidden; });
    if (document.pictureInPictureEnabled) {
      e.btnPip.hidden = false;
      e.btnPip.addEventListener('click', () => this.togglePip());
    }
    this.video.addEventListener('play',  () => { e.btnPlay.textContent = '❚❚'; e.btnPlay.setAttribute('aria-pressed','true'); });
    this.video.addEventListener('pause', () => { e.btnPlay.textContent = '▶';  e.btnPlay.setAttribute('aria-pressed','false'); });
    // wall-clock for live
    setInterval(() => {
      const t = new Date();
      e.ctlClock.textContent = `${String(t.getHours()).padStart(2,'0')}:${String(t.getMinutes()).padStart(2,'0')}`;
    }, 1000);
  }

  togglePlay() { this.video.paused ? this.video.play().catch(()=>{}) : this.video.pause(); }
  toggleMute() { this.video.muted = !this.video.muted; this._syncMute(); }
  _syncMute() {
    const m = this.video.muted || this.video.volume === 0;
    this.els.btnMute.textContent = m ? '🔇' : '🔊';
    this.els.btnMute.setAttribute('aria-pressed', String(m));
    memory.rememberVolume(this.video.volume, this.video.muted);
  }
  setVolume(delta) {
    this.video.muted = false;
    this.video.volume = Math.min(1, Math.max(0, this.video.volume + delta));
    this.els.vol.value = Math.round(this.video.volume * 100);
    this._syncMute();
  }
  async toggleFullscreen() {
    try {
      if (document.fullscreenElement) await document.exitFullscreen();
      else await this.els.root.requestFullscreen();
    } catch {}
  }
  async togglePip() {
    try {
      if (document.pictureInPictureElement) await document.exitPictureInPicture();
      else await this.video.requestPictureInPicture();
    } catch {}
  }
  toggleCaptions() {
    const tracks = this.video.textTracks;
    if (!tracks || !tracks.length) return;
    const on = tracks[0].mode === 'showing';
    for (const tr of tracks) tr.mode = on ? 'disabled' : 'showing';
    this.els.btnCc.setAttribute('aria-pressed', String(!on));
  }

  // ---------- ghost-control auto-hide ----------
  _wireActivity() {
    const show = () => {
      this.els.screen.classList.add('controls-visible');
      clearTimeout(this._hideT);
      this._hideT = setTimeout(() => this.els.screen.classList.remove('controls-visible'), 3000);
    };
    ['mousemove','touchstart','keydown'].forEach((ev) =>
      this.els.screen.addEventListener(ev, show, { passive: true }));
    show();
  }
}