// CoRE.Vizion+ — мобильный dashboard. Оба режима через фирменный плеер (.pjs):
// Live — только пауза/плей + во весь экран; Архив — перемотка + скорость.
// Видео отдаётся сервером уже перекодированным в H.264 (играет на любом телефоне).
"use strict";

// фиксированный профиль H.264 для телефона (макс. совместимость)
const TR = "codec=h264&profile=baseline&bitrate=2000k&preset=ultrafast&keyint=2&rc=vbr&qp=23";

function pad(n) { return String(n).padStart(2, "0"); }
function fmt(s) {
  if (!isFinite(s) || s < 0) s = 0;
  const m = Math.floor(s / 60), sec = Math.floor(s % 60);
  return m + ":" + String(sec).padStart(2, "0");
}
async function api(url) {
  const r = await fetch(url, { credentials: "same-origin" });
  if (r.status === 401) { location.href = "/login"; throw new Error("unauthorized"); }
  if (!r.ok) throw new Error("HTTP " + r.status);
  return r.json();
}

// ── фирменный плеер (.pjs) ──────────────────────────────────────────────
// opts: { live:bool, duration, srcFor(startSec)->url, src }
//   live  — без таймлайна: только пауза/плей + fullscreen.
//   архив — серверный транскод без Range: виртуальный таймлайн на duration,
//           перемотка = перезапуск транскода с -ss (srcFor(t)).
class Player {
  constructor(wrap, opts = {}) {
    this.live = !!opts.live;
    this.total = opts.duration || 0;
    this.srcFor = opts.srcFor || null;
    this.startOffset = 0;
    this.speeds = [0.5, 1, 2, 5]; this.spIdx = 1;
    this.dragging = false; this.dragP = 0;
    wrap.innerHTML = "";
    const root = document.createElement("div");
    root.className = "pjs" + (this.live ? " live" : "");
    root.tabIndex = 0;
    root.innerHTML =
      '<video class="pjs-video" playsinline' + (this.live ? " muted autoplay" : " autoplay") + '></video>' +
      '<div class="pjs-center"><div class="pjs-spinner"></div><button class="pjs-bigplay" aria-label="Play">▶</button></div>' +
      '<div class="pjs-bar">' +
        '<button class="pjs-btn pjs-play" title="Пауза / воспроизведение">⏸</button>' +
        '<span class="pjs-time">0:00</span>' +
        '<div class="pjs-seek"><div class="pjs-buf"></div><div class="pjs-prog"></div><div class="pjs-knob"></div></div>' +
        '<span class="pjs-dur">0:00</span>' +
        '<button class="pjs-btn pjs-speed" title="Скорость воспроизведения">1×</button>' +
        '<button class="pjs-btn pjs-fs" title="Во весь экран">⛶</button>' +
      '</div>';
    wrap.appendChild(root);
    this.root = root;
    this.v = root.querySelector(".pjs-video");
    this.seek = root.querySelector(".pjs-seek");
    this.prog = root.querySelector(".pjs-prog");
    this.buf = root.querySelector(".pjs-buf");
    this.knob = root.querySelector(".pjs-knob");
    this.timeEl = root.querySelector(".pjs-time");
    this.durEl = root.querySelector(".pjs-dur");
    this.playBtn = root.querySelector(".pjs-play");
    this.speedBtn = root.querySelector(".pjs-speed");
    this.v.src = this.live ? opts.src : this.srcFor(0);
    this._bind();
    this.v.play().catch(() => {});
  }
  _total() { return this.total || 0; }
  _curTime() { return this.startOffset + (this.v.currentTime || 0); }
  _applyRate() { this.v.playbackRate = this.speeds[this.spIdx]; }
  _seekToFrac(p) {
    const total = this._total(); if (!total || this.live) return;
    const t = Math.min(total, Math.max(0, p * total));
    this.startOffset = t;                       // перезапуск транскода с нужной секунды
    this.v.src = this.srcFor(t);
    this.v.play().catch(() => {});
    this._sync();
  }
  _bind() {
    const v = this.v, root = this.root;
    v.addEventListener("loadedmetadata", () => { this.durEl.textContent = fmt(this._total()); this._applyRate(); });
    v.addEventListener("timeupdate", () => this._sync());
    v.addEventListener("progress", () => this._syncBuf());
    v.addEventListener("play", () => { this.playBtn.textContent = "⏸"; root.classList.remove("paused"); });
    v.addEventListener("pause", () => { this.playBtn.textContent = "▶"; root.classList.add("paused"); });
    v.addEventListener("waiting", () => root.classList.add("buffering"));
    v.addEventListener("playing", () => root.classList.remove("buffering"));

    const toggle = () => { if (v.paused) v.play().catch(() => {}); else v.pause(); };
    this.playBtn.onclick = toggle;
    root.querySelector(".pjs-bigplay").onclick = toggle;
    v.onclick = toggle;
    root.querySelector(".pjs-fs").onclick = () => this._fs();
    this.speedBtn.onclick = () => {
      this.spIdx = (this.spIdx + 1) % this.speeds.length;
      const r = this.speeds[this.spIdx]; v.playbackRate = r; this.speedBtn.textContent = r + "×";
    };

    if (!this.live) {   // перемотка по шкале (тач): превью при drag, seek на отпускании
      const fracAt = (x) => { const r = this.seek.getBoundingClientRect(); return Math.min(1, Math.max(0, (x - r.left) / r.width)); };
      const preview = (p) => { this.prog.style.width = (p * 100) + "%"; this.knob.style.left = (p * 100) + "%"; this.timeEl.textContent = fmt(p * this._total()); };
      this.seek.addEventListener("pointerdown", (e) => { this.dragging = true; this.dragP = fracAt(e.clientX); try { this.seek.setPointerCapture(e.pointerId); } catch (er) {} preview(this.dragP); });
      this.seek.addEventListener("pointermove", (e) => { if (this.dragging) { this.dragP = fracAt(e.clientX); preview(this.dragP); } });
      this.seek.addEventListener("pointerup", () => { if (this.dragging) { this.dragging = false; this._seekToFrac(this.dragP); } });
    }
  }
  _sync() {
    if (this.dragging || this.live) return;
    const cur = this._curTime(), total = this._total();
    const p = total ? Math.min(1, cur / total) : 0;
    this.prog.style.width = (p * 100) + "%";
    this.knob.style.left = (p * 100) + "%";
    this.timeEl.textContent = fmt(cur);
    this.durEl.textContent = fmt(total);
  }
  _syncBuf() {
    const v = this.v; if (this.live || !v.buffered.length) return;
    const total = this._total(); if (!total) return;
    const end = this.startOffset + v.buffered.end(v.buffered.length - 1);
    this.buf.style.width = Math.min(100, end / total * 100) + "%";
  }
  _fs() {
    const r = this.root;
    if (document.fullscreenElement || document.webkitFullscreenElement) {
      (document.exitFullscreen || document.webkitExitFullscreen || function () {}).call(document);
    } else if (r.requestFullscreen) { r.requestFullscreen().catch(() => {}); }
    else if (r.webkitRequestFullscreen) { r.webkitRequestFullscreen(); }
    else if (this.v.webkitEnterFullscreen) { this.v.webkitEnterFullscreen(); }   // iOS: только видео
  }
  destroy() {
    try { this.v.pause(); this.v.removeAttribute("src"); this.v.load(); } catch (e) { /**/ }
    if (this.root && this.root.parentNode) this.root.parentNode.removeChild(this.root);
  }
}

const M = {
  cams: [], segs: [], liveId: null, archId: null, date: null, view: "live", player: null,

  async init() {
    let data;
    try { data = await api("/api/cameras"); } catch (e) { return; }
    this.cams = data.cameras || [];
    const enabled = this.cams.filter((c) => c.enabled);

    const lc = document.getElementById("m-live-cam");
    const ac = document.getElementById("m-arch-cam");
    lc.innerHTML = enabled.map((c) => `<option value="${c.id}">${c.name}</option>`).join("");
    ac.innerHTML = this.cams.map((c) => `<option value="${c.id}">${c.name}</option>`).join("");
    this.liveId = enabled[0] ? enabled[0].id : null;
    this.archId = this.cams[0] ? this.cams[0].id : null;
    lc.onchange = () => { this.liveId = lc.value; this.startLive(); };
    ac.onchange = () => { this.archId = ac.value; this.loadArch(); };

    const dt = document.getElementById("m-arch-date");
    const t = new Date();
    this.date = `${t.getFullYear()}-${pad(t.getMonth() + 1)}-${pad(t.getDate())}`;
    dt.value = this.date;
    dt.onchange = () => { this.date = dt.value; this.loadArch(); };

    // бутерброд-меню сверху: выбор режима (Live / Архив)
    const drawer = document.getElementById("m-drawer");
    const scrim = document.getElementById("m-scrim");
    const setMenu = (open) => { drawer.classList.toggle("open", open); scrim.hidden = !open; };
    document.getElementById("m-burger").onclick = () => setMenu(!drawer.classList.contains("open"));
    scrim.onclick = () => setMenu(false);
    document.querySelectorAll(".m-nav").forEach((b) => {
      b.onclick = () => { this.showView(b.dataset.view); setMenu(false); };
    });

    this.showView("live");
  },

  _kill() { if (this.player) { this.player.destroy(); this.player = null; } },

  showView(v) {
    this.view = v;
    document.getElementById("m-title").textContent = v === "live" ? "Live" : "Архив";
    document.querySelectorAll(".m-nav").forEach((b) => b.classList.toggle("active", b.dataset.view === v));
    document.getElementById("view-live").hidden = v !== "live";
    document.getElementById("view-arch").hidden = v !== "arch";
    this._kill();
    if (v === "live") this.startLive();
    else this.loadArch();
  },

  // ── Live ──
  startLive() {
    this._kill();
    const box = document.getElementById("m-live-box");
    if (!this.liveId) { box.innerHTML = '<div class="m-empty">Нет доступных камер</div>'; return; }
    this.player = new Player(box, { live: true, src: `/api/cameras/${this.liveId}/live.mp4?stream=sub&${TR}` });
  },

  // ── Архив ──
  async loadArch() {
    this._kill();
    const box = document.getElementById("m-arch-box");
    const list = document.getElementById("m-seglist");
    box.innerHTML = '<div class="m-empty">Выберите запись ниже</div>';
    if (!this.archId || !this.date) { list.innerHTML = ""; return; }
    const [y, m, d] = this.date.split("-").map(Number);
    const from = Math.floor(new Date(y, m - 1, d, 0, 0, 0).getTime() / 1000);
    const to = from + 86400;
    list.innerHTML = '<div class="m-empty">Загрузка…</div>';
    let recs = [];
    try { recs = (await api(`/api/recordings?camera=${this.archId}&from=${from}&to=${to}`)).recordings || []; }
    catch (e) { list.innerHTML = '<div class="m-empty">Ошибка загрузки</div>'; return; }
    if (!recs.length) { list.innerHTML = '<div class="m-empty">За выбранный день записей нет</div>'; return; }
    this.segs = recs;
    list.innerHTML = recs.map((r) => {
      const tt = new Date(r.started_at * 1000);
      const mins = Math.round((r.duration_s || 0) / 60);
      return `<button class="m-seg" data-id="${r.id}">` +
             `${pad(tt.getHours())}:${pad(tt.getMinutes())}:${pad(tt.getSeconds())}` +
             `<span class="m-dur">${mins} мин</span></button>`;
    }).join("");
    list.onclick = (e) => {
      const b = e.target.closest(".m-seg");
      if (!b) return;
      list.querySelectorAll(".m-seg").forEach((x) => x.classList.toggle("active", x === b));
      this.playSeg(+b.dataset.id);
    };
  },
  playSeg(id) {
    this._kill();
    const seg = this.segs.find((r) => r.id === id);
    const box = document.getElementById("m-arch-box");
    this.player = new Player(box, {
      duration: seg ? (seg.duration_s || 0) : 0,
      srcFor: (t) => `/api/recordings/${id}/play.mp4?${TR}&start=${(t || 0).toFixed(3)}`,
    });
  },
};

document.addEventListener("DOMContentLoaded", () => M.init());