/* =========================================================
   Admin 管理后台前端逻辑（Jinja 页面配套）
   动态操作调用 FastAPI REST，完成后整页刷新（服务端重渲染）
   ========================================================= */
(function () {
  'use strict';

  var init = window.__DPM_INIT || { fullscreen: true, autostart: false };
  var fullscreen = !!init.fullscreen;
  var autostart = !!init.autostart;

  /* ---------- Toast ---------- */
  var toastContainer = document.getElementById('toastContainer');
  function toast(msg, type) {
    if (!toastContainer) return;
    var el = document.createElement('div');
    el.className = 'toast ' + (type || 'success');
    el.textContent = msg;
    toastContainer.appendChild(el);
    setTimeout(function () { el.remove(); }, 2800);
  }

  /* ---------- 通用请求 ---------- */
  function post(url, body, cb) {
    fetch(url, {
      method: 'POST',
      headers: body ? { 'Content-Type': 'application/json' } : undefined,
      body: body ? JSON.stringify(body) : undefined,
    })
      .then(function (r) { return r.json().catch(function () { return {}; }); })
      .then(function (d) {
        if (d && d.ok === false) { toast(d.error || '操作失败', 'error'); return; }
        if (cb) cb(d);
      })
      .catch(function () { toast('网络错误', 'error'); });
  }
  function reload(msg) {
    if (msg) toast(msg);
    setTimeout(function () { location.reload(); }, 350);
  }

  /* ---------- 播放状态（SSE） ---------- */
  var statusText = document.getElementById('statusText');
  try {
    var es = new EventSource('/api/events');
    es.onmessage = function (e) {
      var msg; try { msg = JSON.parse(e.data); } catch (err) { return; }
      if (msg.action === 'state_update' && msg.state && statusText) {
        var s = msg.state;
        if (!s.status || s.status === 'idle' || !s.name) statusText.textContent = '等待大屏连接...';
        else if (s.status === 'playing') statusText.textContent = '正在播放 — ' + s.name;
        else if (s.status === 'paused') statusText.textContent = '已暂停 — ' + s.name;
      }
      if (msg.action === 'playlist_changed') reload();
    };
  } catch (err) { /* ignore */ }

  /* ---------- 播放控制 ---------- */
  document.querySelectorAll('[data-control]').forEach(function (btn) {
    btn.addEventListener('click', function () {
      var action = btn.getAttribute('data-control');
      if (action === 'minimize') {
        post('/api/display/command', { action: 'minimize', params: {} });
      } else {
        post('/api/control', { action: action });
      }
    });
  });

  /* ---------- 播放设置 ---------- */
  var playMode = document.getElementById('playMode');
  if (playMode) playMode.addEventListener('change', function () {
    post('/api/settings', { play_mode: playMode.value }, function () { toast('播放模式已更新'); });
  });

  var imageDuration = document.getElementById('imageDuration');
  if (imageDuration) imageDuration.addEventListener('change', function () {
    var v = Number(imageDuration.value);
    if (v < 1 || v > 300) { toast('时长需在 1-300 秒', 'error'); imageDuration.value = 5; return; }
    post('/api/settings', { image_duration: v }, function () { toast('图片时长已更新'); });
  });

  var volumeRange = document.getElementById('volumeRange');
  var volumeLabel = document.getElementById('volumeLabel');
  var volTimer = null;
  if (volumeRange && volumeLabel) {
    volumeRange.addEventListener('input', function () {
      volumeLabel.textContent = volumeRange.value + '%';
      if (volTimer) clearTimeout(volTimer);
      volTimer = setTimeout(function () {
        post('/api/settings', { volume: Number(volumeRange.value) }, function () { toast('音量已更新'); });
      }, 300);
    });
  }

  /* ---------- 显示控制 ---------- */
  var btnFullscreen = document.getElementById('btnFullscreen');
  function renderDisplay() {
    if (btnFullscreen) btnFullscreen.textContent = fullscreen ? '切换窗口模式' : '切换大屏模式';
    var btnAutostart = document.getElementById('btnAutostart');
    if (btnAutostart) { btnAutostart.textContent = autostart ? '已开启' : '已关闭'; btnAutostart.classList.toggle('active', autostart); }
  }
  if (btnFullscreen) btnFullscreen.addEventListener('click', function () {
    fullscreen = !fullscreen;
    renderDisplay();
    post('/api/settings', { fullscreen: fullscreen });
  });
  var btnAutostart = document.getElementById('btnAutostart');
  if (btnAutostart) btnAutostart.addEventListener('click', function () {
    autostart = !autostart;
    renderDisplay();
    post('/api/settings', { autostart: autostart });
  });
  renderDisplay();

  /* ---------- 上传（带进度） ---------- */
  var btnUpload = document.getElementById('btnUpload');
  if (btnUpload) btnUpload.addEventListener('click', function () {
    var inp = document.getElementById('fileInput');
    var fileList = Array.from(inp.files || []);
    if (fileList.length === 0) { toast('请选择文件', 'error'); return; }

    var prog = document.getElementById('uploadProgress');
    var fill = document.getElementById('progressFill');
    var text = document.getElementById('progressText');
    prog.style.display = 'block';

    var done = 0;
    fileList.forEach(function (file) {
      var fd = new FormData();
      fd.append('file', file);
      var xhr = new XMLHttpRequest();
      xhr.open('POST', '/upload');
      xhr.upload.onprogress = function (e) {
        if (e.lengthComputable) {
          var pct = Math.round((e.loaded / e.total) * 100);
          var overall = Math.round(((done + e.loaded / e.total) / fileList.length) * 100);
          fill.style.width = overall + '%';
          text.textContent = file.name + ' (' + (done + 1) + '/' + fileList.length + ') — ' + pct + '%';
        }
      };
      xhr.onload = function () {
        done += 1;
        if (done === fileList.length) reload('上传完成');
      };
      xhr.onerror = function () { toast(file.name + ' 上传失败', 'error'); done += 1; };
      xhr.send(fd);
    });
  });

  /* ---------- 远程 URL ---------- */
  var btnAddUrl = document.getElementById('btnAddUrl');
  if (btnAddUrl) btnAddUrl.addEventListener('click', function () {
    var inp = document.getElementById('urlInput');
    var url = (inp.value || '').trim();
    if (!url) { toast('请输入 URL', 'error'); return; }
    post('/api/media/add-url', { url: url }, function (d) {
      reload(d && d.duplicate ? 'URL 已存在于媒体库' : '已添加到媒体库');
    });
  });

  /* ---------- 媒体操作（加入播放 / 移出 / 删除） ---------- */
  document.querySelectorAll('[data-action]').forEach(function (btn) {
    btn.addEventListener('click', function (e) {
      e.stopPropagation();
      var card = btn.closest('.media-card');
      var path = card.getAttribute('data-path');
      var action = btn.getAttribute('data-action');
      if (action === 'add-playlist') {
        post('/api/playlist/add', { path: path }, function () { reload('已加入播放列表'); });
      } else if (action === 'remove-playlist') {
        post('/api/playlist/remove', { path: path }, function () { reload('已移出播放列表'); });
      } else if (action === 'delete') {
        if (!window.confirm('确定删除该文件？')) return;
        post('/api/delete', { path: path }, function () { reload('已删除'); });
      }
    });
  });

  /* ---------- 预览弹窗 ---------- */
  var modal = document.getElementById('previewModal');
  var modalBody = document.getElementById('previewBody');
  var current = null;

  function openPreview(card) {
    var path = card.getAttribute('data-path');
    var type = card.getAttribute('data-type');
    var source = card.getAttribute('data-source');
    var name = card.getAttribute('data-name');
    var url = source === 'url' ? path : '/file/' + encodeURI(path);
    current = { path: path, url: url, type: type, name: name };
    document.getElementById('previewTitle').textContent = name;
    modalBody.innerHTML = type === 'image'
      ? '<img src="' + url + '" alt="' + name + '">'
      : '<video src="' + url + '" controls autoplay playsinline></video>';
    document.getElementById('previewMeta').innerHTML =
      '<span class="badge ' + (source === 'url' ? 'badge-url' : 'badge-local') + '">' + (source === 'url' ? '远程' : '本地') + '</span>' +
      '<span class="badge ' + (type === 'video' ? 'badge-video' : 'badge-image') + '">' + (type === 'video' ? '视频' : '图片') + '</span>';
    modal.style.display = 'flex';
  }
  function closePreview() {
    var v = modalBody.querySelector('video');
    if (v) { v.pause(); v.removeAttribute('src'); v.load(); }
    modalBody.innerHTML = '';
    modal.style.display = 'none';
    current = null;
  }
  document.querySelectorAll('[data-preview]').forEach(function (el) {
    el.addEventListener('click', function () { openPreview(el.closest('.media-card')); });
  });
  document.getElementById('previewClose').addEventListener('click', closePreview);
  modal.addEventListener('click', function (e) {
    if (e.target === modal) closePreview();
  });
  document.addEventListener('keydown', function (e) { if (e.key === 'Escape') closePreview(); });
  document.getElementById('previewAdd').addEventListener('click', function () {
    if (!current) return;
    post('/api/playlist/add', { path: current.path }, function () { closePreview(); reload('已加入播放列表'); });
  });
  document.getElementById('previewDelete').addEventListener('click', function () {
    if (!current) return;
    if (!window.confirm('确定删除该文件？')) return;
    post('/api/delete', { path: current.path }, function () { closePreview(); reload('已删除'); });
  });
})();