/* =========================================================
   Admin 管理后台前端逻辑（Jinja 页面配套）
   事件采用 document 委托绑定，保证按钮点击稳定响应；
   连接状态每 3s 轮询 /api/display/state 刷新
   ========================================================= */
(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, delay) {
    if (msg) toast(msg);
    setTimeout(function () { location.reload(); }, delay || 600);
  }

  /* ---------- 播放状态（SSE，仅更新状态文字，不自动重载页面） ---------- */
  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;
      }
    };
  } catch (err) { /* ignore */ }

  /* =========================================================
     连接状态轮询（/api/display/state）
     ========================================================= */
  var connEls = {
    api: document.getElementById('connApi'),
    mqtt: document.getElementById('connMqtt'),
    screens: document.getElementById('connScreens'),
    lastCmd: document.getElementById('connLastCmd'),
  };
  function setConn(id, ok, value) {
    var el = connEls[id];
    if (!el) return;
    var dot = el.querySelector('.conn-dot');
    var val = el.querySelector('.conn-value');
    if (dot) dot.className = 'conn-dot ' + (ok ? 'on' : 'off');
    if (val) val.textContent = value;
  }
  function pollStatus() {
    fetch('/api/display/state', { cache: 'no-store' })
      .then(function (r) { return r.json(); })
      .then(function (d) {
        setConn('api', true, '在线');
        setConn('mqtt', !!d.mqtt_connected, d.mqtt_connected ? '已连接（' + (d.mqtt_host || '') + '）' : '未连接');
        setConn('screens', (d.screens_online || 0) > 0, (d.screens_online || 0) + ' 台');
        var lc = d.last_command;
        if (lc) {
          var names = { navigate: '页面切换', play: '播放', pause: '暂停', next: '下一项', prev: '上一项',
            'play_target': '指定播放', alert: '通知', show_card: '卡片', set_mode: '播放模式' };
          var when = new Date(lc.ts).toLocaleTimeString('zh-CN', { hour12: false });
          setConn('lastCmd', !!lc.published,
            (names[lc.action] || lc.action) + ' · ' + (lc.published ? '已广播' : '未广播') + ' · ' + when);
        }
      })
      .catch(function () {
        setConn('api', false, '离线');
        setConn('mqtt', false, '未知');
        setConn('screens', false, '未知');
      });
  }
  if (connEls.api) { pollStatus(); setInterval(pollStatus, 3000); }

  /* =========================================================
     事件委托：页面切换 / 播放控制 / 媒体操作
     ========================================================= */
  // 输入框回车提交
  document.addEventListener('keydown', function (e) {
    if (e.key !== 'Enter') return;
    if (e.target && e.target.id === 'mqttAiInput') { document.getElementById('mqttAiSend').click(); }
    else if (e.target && e.target.id === 'mqttAlertText') { document.getElementById('mqttAlertSend').click(); }
  });

  document.addEventListener('click', function (e) {
    var btn = e.target.closest ? e.target.closest('[data-nav], [data-mqtt], [data-control], [data-action], .copy-btn, [data-preview], #mqttAiSend, #mqttAlertSend') : null;
    if (!btn) return;
    e.stopPropagation();

    // 预览
    if (btn.hasAttribute('data-preview')) { openPreview(btn.closest('.media-card')); return; }

    // 复制 URL
    if (btn.classList.contains('copy-btn')) {
      var url = btn.closest('.media-url').getAttribute('data-url') || '';
      var full = /^https?:\/\//.test(url) ? url : window.location.origin + url;
      var done = function () { toast('链接已复制'); };
      if (navigator.clipboard && navigator.clipboard.writeText) {
        navigator.clipboard.writeText(full).then(done).catch(function () { fallbackCopy(full); done(); });
      } else { fallbackCopy(full); done(); }
      return;
    }

    // 大屏 MQTT 指令（data-mqtt 携带完整 {action, params} JSON）
    if (btn.hasAttribute('data-mqtt')) {
      var cmd = null;
      try { cmd = JSON.parse(btn.getAttribute('data-mqtt')); } catch (err) { toast('指令 JSON 错误', 'error'); return; }
      post('/api/display/command', cmd, function (d) {
        toast(d && d.ok !== false ? '指令已发送：' + (cmd.action || '') : '发送失败（MQTT 未连接？）',
              d && d.ok !== false ? 'ok' : 'error');
      });
      return;
    }

    // AI 提问输入框
    if (btn.id === 'mqttAiSend') {
      var text = (document.getElementById('mqttAiInput').value || '').trim();
      if (!text) { toast('请输入问题', 'error'); return; }
      post('/api/display/command', { action: 'ai_input', params: { text: text } }, function () {
        toast('已发送问题到大屏 AI 页');
      });
      return;
    }

    // 通知输入框
    if (btn.id === 'mqttAlertSend') {
      var alertText = (document.getElementById('mqttAlertText').value || '').trim();
      if (!alertText) { toast('请输入通知内容', 'error'); return; }
      post('/api/display/command', { action: 'alert', params: { text: alertText } }, function () {
        toast('通知已广播');
      });
      return;
    }

    // 页面切换
    if (btn.hasAttribute('data-nav')) {
      var page = btn.getAttribute('data-nav');
      post('/api/display/command', { action: 'navigate', params: { page: page } }, function () {
        toast('已切换大屏至「' + btn.textContent.trim() + '」');
      });
      return;
    }

    // 播放控制
    if (btn.hasAttribute('data-control')) {
      var action = btn.getAttribute('data-control');
      if (action === 'minimize') post('/api/display/command', { action: 'minimize', params: {} });
      else post('/api/control', { action: action });
      return;
    }

    // 媒体操作
    if (btn.hasAttribute('data-action')) {
      var card = btn.closest('.media-card');
      var path = card.getAttribute('data-path');
      var act = btn.getAttribute('data-action');
      if (act === 'play-now') {
        post('/api/playlist/play', { path: path }, function () { toast('已发送播放指令，大屏即将播放'); });
      } else if (act === 'add-playlist') {
        post('/api/playlist/add', { path: path }, function () { reload('已加入播放列表'); });
      } else if (act === 'remove-playlist') {
        post('/api/playlist/remove', { path: path }, function () { reload('已移出播放列表'); });
      } else if (act === 'delete') {
        if (!window.confirm('确定删除该文件？')) return;
        post('/api/delete', { path: path }, function () { reload('已删除'); });
      }
    }
  });

  function fallbackCopy(text) {
    var ta = document.createElement('textarea');
    ta.value = text; ta.style.position = 'fixed'; ta.style.opacity = '0';
    document.body.appendChild(ta); ta.select();
    try { document.execCommand('copy'); } catch (err) { /* ignore */ }
    document.body.removeChild(ta);
  }

  /* =========================================================
     播放设置（change/input 事件）
     ========================================================= */
  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('媒体音量已更新'); });
      }, 300);
    });
  }

  var sfxVolumeRange = document.getElementById('sfxVolumeRange');
  var sfxVolumeLabel = document.getElementById('sfxVolumeLabel');
  var sfxVolTimer = null;
  if (sfxVolumeRange && sfxVolumeLabel) {
    sfxVolumeRange.addEventListener('input', function () {
      sfxVolumeLabel.textContent = sfxVolumeRange.value + '%';
      if (sfxVolTimer) clearTimeout(sfxVolTimer);
      sfxVolTimer = setTimeout(function () {
        post('/api/settings', { sfx_volume: Number(sfxVolumeRange.value) }, function () { toast('音效音量已更新'); });
      }, 300);
    });
  }

  /* ---------- 显示控制 ---------- */
  var btnFullscreen = document.getElementById('btnFullscreen');
  var btnAutostart = document.getElementById('btnAutostart');
  function renderDisplay() {
    if (btnFullscreen) btnFullscreen.textContent = fullscreen ? '切换窗口模式' : '切换大屏模式';
    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 });
  });
  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');
  var btnAddUrlPlay = document.getElementById('btnAddUrlPlay');
  function addUrlThen(play) {
    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) {
      if (play) {
        post('/api/playlist/play', { path: url }, function () { toast('已加入并发送播放指令'); });
      } else {
        reload(d && d.duplicate ? 'URL 已存在于媒体库' : '已添加到媒体库');
      }
    });
  }
  if (btnAddUrl) btnAddUrl.addEventListener('click', function () { addUrlThen(false); });
  if (btnAddUrlPlay) btnAddUrlPlay.addEventListener('click', function () { addUrlThen(true); });

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

  function openPreview(card) {
    if (!card || !modal) return;
    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.getElementById('previewClose').addEventListener('click', closePreview);
  if (modal) 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('previewPlay').addEventListener('click', function () {
    if (!current) return;
    post('/api/playlist/play', { path: current.path }, function () { closePreview(); toast('已发送播放指令'); });
  });
  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'); });
  });
})();