'use strict';
/* admin → sessions section: sessions timeline + drawer detail */
(function () {
  'use strict';
  let inited = false;

  let allSessions  = [];
  let openDrawerId = null;

  /* SVG icons (Lucide-style) — kept local to mirror users.js without coupling */
  const SESS_ICONS = {
    eye:   '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M2 12s3-7 10-7 10 7 10 7-3 7-10 7-10-7-10-7Z"/><circle cx="12" cy="12" r="3"/></svg>',
    trash: '<svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M3 6h18"/><path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6"/><path d="M8 6V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"/><line x1="10" y1="11" x2="10" y2="17"/><line x1="14" y1="11" x2="14" y2="17"/></svg>',
  };

  /* Inject .row-actions / .row-action-btn styles only if users.js hasn't (sessions can render first). */
  function ensureRowActionsStyles() {
    if (document.getElementById('row-actions-style')) return;
    const s = document.createElement('style');
    s.id = 'row-actions-style';
    s.textContent = `
      .row-actions { opacity: 0; transition: opacity .15s ease; display: inline-flex; gap: 4px; vertical-align: middle; }
      tr:hover .row-actions, .sess-tl-item:hover .row-actions { opacity: 1; }
      tr.selected .row-actions, .sess-tl-item.open .row-actions { opacity: 1; }
      .row-action-btn { width: 28px; height: 28px; border-radius: 6px; border: 1px solid var(--border); background: transparent; cursor: pointer; display: inline-flex; align-items: center; justify-content: center; color: var(--text-3); transition: background .12s ease, border-color .12s ease, color .12s ease; padding: 0; }
      .row-action-btn:hover { background: rgba(155,93,229,.08); border-color: var(--violet); color: var(--violet); }
      .row-action-btn:focus-visible { outline: 2px solid var(--violet); outline-offset: 1px; }
      .row-action-btn.danger:hover { background: rgba(239,68,68,.08); border-color: var(--red, #EF4444); color: var(--red, #EF4444); }
      .row-action-btn svg { width: 14px; height: 14px; pointer-events: none; }
      .row-action-btn:disabled { opacity: .5; cursor: wait; }
      .row-actions-cell { text-align: right; white-space: nowrap; padding-right: 12px; }
      @media (max-width: 768px) {
        .row-actions { display: none; }
      }
    `;
    document.head.appendChild(s);
  }

  async function load() {
    const subject = document.getElementById('t-subject').value;
    document.getElementById('t-body').innerHTML = '<div class="spinner"></div>';
    openDrawerId = null;
    ensureRowActionsStyles();
    try {
      allSessions = await LS.adminGetSessions({ subject: subject || undefined });
      renderSessions();
    } catch (e) {
      document.getElementById('t-body').innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`;
    }
  }

  function sessPctRing(pct) {
    const { pctClass } = AdminCtx;
    const pc  = pctClass(pct);
    const colorMap = {'pct-hi':'var(--green)','pct-mid':'var(--amber)','pct-lo':'var(--pink)'};
    const color = colorMap[pc] || 'var(--text-3)';
    const circ = 106.8;
    const dash = (pct / 100 * circ).toFixed(1);
    return `<svg class="sess-tl-ring" width="48" height="48" viewBox="0 0 48 48">
      <circle cx="24" cy="24" r="17" fill="none" stroke="rgba(15,23,42,0.08)" stroke-width="4"/>
      <circle cx="24" cy="24" r="17" fill="none" stroke="${color}" stroke-width="4"
        stroke-dasharray="${dash} ${circ}" stroke-dashoffset="26.7" stroke-linecap="round"
        transform="rotate(-90 24 24)"/>
      <text x="24" y="28" text-anchor="middle" font-family="Unbounded,sans-serif" font-size="8" font-weight="800" fill="${color}">${pct}%</text>
    </svg>`;
  }

  function renderSessions() {
    const { MODES, fmtDate, fmtTime } = AdminCtx;
    const modeF   = document.getElementById('t-mode').value;
    const searchF = document.getElementById('t-search').value.toLowerCase();
    const filtered = allSessions.filter(s => {
      if (modeF && s.mode !== modeF) return false;
      if (searchF && !s.user_name.toLowerCase().includes(searchF) && !s.user_email.toLowerCase().includes(searchF)) return false;
      return true;
    });
    document.getElementById('t-count').textContent = `${filtered.length} тестов`;
    if (!filtered.length) {
      document.getElementById('t-body').innerHTML = '<div class="empty">Нет тестов</div>';
      return;
    }
    const groups = {};
    filtered.forEach(s => {
      const key = fmtDate(s.started_at);
      (groups[key] = groups[key] || []).push(s);
    });
    document.getElementById('t-body').innerHTML = Object.entries(groups).map(([date, sessions]) =>
      `<div class="sess-tl-day">${date}</div>
       <div class="sess-tl-wrap">${sessions.map(s => {
         const ring = s.percent !== null
           ? sessPctRing(s.percent)
           : `<div style="width:48px;height:48px;display:flex;align-items:center;justify-content:center;font-family:'Unbounded',sans-serif;font-size:0.85rem;font-weight:800;color:var(--text-3)">—</div>`;
         return `<div class="sess-tl-item" id="trow-${s.id}" onclick="toggleDrawer(${s.id})">
           ${ring}
           <div class="sess-tl-user">
             <div class="sess-tl-name">${esc(s.user_name)}</div>
             <div class="sess-tl-meta">${esc(s.subject_name||'?')} · <span class="mode-badge mode-${s.mode}">${MODES[s.mode]||s.mode}</span></div>
           </div>
           <div class="sess-tl-score">${s.score??'—'} / ${s.total}</div>
           <div class="sess-tl-time">${fmtTime(s.duration_sec)}</div>
           <div class="row-actions" onclick="event.stopPropagation()">
             <button type="button" class="row-action-btn" title="Открыть детали"
               onclick="event.stopPropagation();toggleDrawer(${s.id})">${SESS_ICONS.eye}</button>
             <button type="button" class="row-action-btn danger" title="Удалить сессию"
               onclick="event.stopPropagation();quickDeleteSession(${s.id},this)">${SESS_ICONS.trash}</button>
           </div>
         </div>
         <div class="sess-tl-drawer" id="tdrawer-${s.id}">
           <div class="sess-drawer" id="drawer-${s.id}">
             <div class="sess-drawer-inner" id="drawer-inner-${s.id}"><div class="spinner"></div></div>
           </div>
         </div>`;
       }).join('')}</div>`
    ).join('');
  }

  async function toggleDrawer(id) {
    const drawerEl = document.getElementById('tdrawer-' + id);
    const drawer   = document.getElementById('drawer-'  + id);
    const trow     = document.getElementById('trow-'    + id);
    if (openDrawerId && openDrawerId !== id) {
      document.getElementById('tdrawer-' + openDrawerId)?.classList.remove('open');
      document.getElementById('drawer-'  + openDrawerId)?.classList.remove('open');
      document.getElementById('trow-'    + openDrawerId)?.classList.remove('open');
    }
    if (openDrawerId === id) {
      drawerEl.classList.remove('open'); drawer.classList.remove('open'); trow.classList.remove('open');
      openDrawerId = null; return;
    }
    openDrawerId = id; trow.classList.add('open');
    drawerEl.classList.add('open');
    requestAnimationFrame(() => drawer.classList.add('open'));
    const inner = document.getElementById('drawer-inner-' + id);
    if (inner.dataset.loaded) return;
    inner.dataset.loaded = '1';
    try {
      const d = await LS.adminGetSessionDetail(id);
      renderDrawer(inner, d);
    } catch (e) { inner.innerHTML = `<div class="error">Ошибка: ${esc(e.message)}</div>`; }
  }

  function renderDrawer(el, d) {
    const { MODES, pctClass, fmtDate, fmtTime, renderMath } = AdminCtx;
    const pct     = d.score !== null && d.total ? Math.round((d.score/d.total)*100) : null;
    const pc      = pctClass(pct);
    const correct = d.questions.filter(q => q.is_correct).length;
    const wrong   = d.questions.filter(q => !q.is_correct && q.chosen_option_id).length;
    const skipped = d.questions.filter(q => !q.chosen_option_id).length;
    const qHtml   = d.questions.map((q,i) => {
      const status   = !q.chosen_option_id ? 'skipped' : q.is_correct ? 'correct' : 'wrong';
      const badgeTxt = { correct:'Верно', wrong:'Неверно', skipped:'Пропущено' }[status];
      const opts = q.options.map(o => {
        const isCor = o.is_correct, isCho = o.id === q.chosen_option_id;
        let cls='', icon='<svg class="ic" viewBox="0 0 24 24"><circle cx="12" cy="12" r="8"/></svg>';
        if (isCor) { cls='correct-opt'; icon='<i data-lucide="check" style="width:13px;height:13px"></i>'; }
        else if (isCho && !isCor) { cls='chosen-wrong'; icon='<i data-lucide="x" style="width:13px;height:13px"></i>'; }
        return `<div class="qb-opt ${cls}"><span class="qb-opt-icon">${icon}</span>${esc(o.text)}</div>`;
      }).join('');
      const expl = q.explanation ? `<div class="qb-expl"><strong>Пояснение:</strong> ${esc(q.explanation)}</div>` : '';
      return `<div class="qb-item ${status}">
        <div class="qb-header"><span class="qb-qnum">Вопрос ${i+1}</span><span class="qb-badge ${status}">${badgeTxt}</span><span class="qb-time">${q.time_spent_sec?q.time_spent_sec+' сек':''}</span></div>
        <div class="qb-text">${esc(q.text)}</div>
        <div class="qb-opts">${opts}</div>${expl}
      </div>`;
    }).join('');
    el.innerHTML = `
      <div class="drawer-header">
        <div>
          <div style="font-family:'Unbounded',sans-serif;font-weight:800;font-size:0.95rem">${esc(d.user_name)}</div>
          <div class="drawer-meta">${esc(d.user_email)} · ${d.subject_name||'?'} · ${MODES[d.mode]||d.mode} · ${fmtDate(d.started_at)}</div>
        </div>
        <div class="drawer-score ${pc}">${pct !== null ? pct+'%' : '—'}</div>
        <div style="display:flex;gap:20px;margin-left:auto;text-align:center">
          <div><div style="font-family:'Unbounded',sans-serif;color:var(--green);font-weight:700">${correct}</div><div style="font-size:0.72rem;color:var(--text-3)">Верно</div></div>
          <div><div style="font-family:'Unbounded',sans-serif;color:var(--pink);font-weight:700">${wrong}</div><div style="font-size:0.72rem;color:var(--text-3)">Неверно</div></div>
          <div><div style="font-family:'Unbounded',sans-serif;color:var(--text-3);font-weight:700">${skipped}</div><div style="font-size:0.72rem;color:var(--text-3)">Пропущено</div></div>
          <div><div style="font-family:'Unbounded',sans-serif;color:var(--text-2);font-weight:700">${fmtTime(d.duration_sec)}</div><div style="font-size:0.72rem;color:var(--text-3)">Время</div></div>
        </div>
      </div>
      <div class="qb-list">${qHtml||'<div class="empty">Вопросы не найдены</div>'}</div>`;
    renderMath(el);
    if (window.lucide) lucide.createIcons();
  }

  async function quickDeleteSession(id, btn) {
    if (!await LS.confirm(
      'Удалить эту сессию? Все ответы и связанные данные будут удалены.\nЭто действие нельзя отменить.',
      { title: 'Удалить сессию', confirmText: 'Удалить' }
    )) return;
    btn.disabled = true;
    try {
      await LS.adminDeleteSession(id);
      LS.toast('Сессия удалена', 'success');
      // Refresh from server — keeps grouped layout consistent.
      await load();
    } catch (e) {
      LS.toast('Ошибка: ' + e.message, 'error');
      btn.disabled = false;
    }
  }

  // Expose handlers
  window.loadSessions = load;
  window.renderSessions = renderSessions;
  window.toggleDrawer = toggleDrawer;
  window.quickDeleteSession = quickDeleteSession;

  window.AdminSections = window.AdminSections || {};
  window.AdminSections.sessions = {
    init: async () => { if (inited) return; inited = true; await load(); },
    reload: load,
  };
})();