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

  let allSessions  = [];
  let openDrawerId = null;

  async function load() {
    const subject = document.getElementById('t-subject').value;
    document.getElementById('t-body').innerHTML = '<div class="spinner"></div>';
    openDrawerId = null;
    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>
         <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();
  }

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

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