// ── Cronjob Page ──

registerPage('cronjob', {
  async init(params) {
    const isEdit = params && params.id;
    const title = document.getElementById('cronjobPageTitle');
    const nameInput = document.getElementById('cronjobName');
    const sessionSelect = document.getElementById('cronjobSession');
    const sessionCard = document.getElementById('cronjobSessionCard');
    const cronInput = document.getElementById('cronjobCron');
    const cronPreview = document.getElementById('cronjobCronPreview');
    const promptInput = document.getElementById('cronjobPrompt');
    const notifySelect = document.getElementById('cronjobNotifySession');
    const notifyCard = document.getElementById('cronjobNotifySessionCard');
    const enabledCheckbox = document.getElementById('cronjobEnabled');
    const statusBox = document.getElementById('cronjobStatusBox');
    const saveBtn = document.getElementById('cronjobSaveBtn');
    const runBtn = document.getElementById('cronjobRunBtn');
    const deleteBtn = document.getElementById('cronjobDeleteBtn');

    // Sessions + Agents laden
    const sessions = await apiGetSessions();
    const agents = await apiGetAvailableAgents();
    const agentMap = {};
    for (const a of agents) agentMap[a.agentId] = a;
    const sessionMap = {};
    for (const s of sessions) sessionMap[s.sessionId] = s;

    // Session-Card rendern
    function renderSessionSelectCard(cardEl, session, emptyIcon, emptyText) {
      const inner = session ? buildSessionCard(session, session.agentId ? agentMap[session.agentId] : null) : null;
      _renderCardPreview(cardEl, inner, emptyIcon, emptyText, 'session-select-change');
    }

    // Session-Card click → Picker (nur Sessions mit Agent)
    sessionCard.addEventListener('click', () => {
      openSessionPickerModal(sessions, agentMap, sessionSelect.value, (selectedId) => {
        sessionSelect.value = selectedId || '';
        renderSessionSelectCard(sessionCard, selectedId ? sessionMap[selectedId] : null, 'fa-comment-o', 'Keine Session ausgewählt');
      }, { filterWithAgent: true, title: 'Session auswählen' });
    });

    // Notify-Session-Card click → Picker (alle Sessions)
    notifyCard.addEventListener('click', () => {
      openSessionPickerModal(sessions, agentMap, notifySelect.value, (selectedId) => {
        notifySelect.value = selectedId || '';
        renderSessionSelectCard(notifyCard, selectedId ? sessionMap[selectedId] : null, 'fa-bell-o', 'Keine (Antwort bleibt in Arbeits-Session)');
      }, { filterWithAgent: false, title: 'Benachrichtigungs-Session auswählen', noneLabel: 'Keine Benachrichtigung', noneIcon: 'fa-bell-slash' });
    });

    // Cron-Expression Vorschau
    cronInput.addEventListener('input', () => updateCronPreview(cronInput, cronPreview));

    if (isEdit) {
      title.textContent = 'Cronjob bearbeiten';
      runBtn.hidden = false;
      deleteBtn.hidden = false;

      const job = await apiGetCronjob(params.id);
      if (!job) {
        showToast('Cronjob nicht gefunden', 'error');
        navigateTo('dashboard');
        return;
      }

      nameInput.value = job.name || '';
      sessionSelect.value = job.sessionId || '';
      renderSessionSelectCard(sessionCard, job.sessionId ? sessionMap[job.sessionId] : null, 'fa-comment-o', 'Keine Session ausgewählt');
      cronInput.value = job.cronExpression || '';
      promptInput.value = job.prompt || '';
      notifySelect.value = job.notifySessionId || '';
      renderSessionSelectCard(notifyCard, job.notifySessionId ? sessionMap[job.notifySessionId] : null, 'fa-bell-o', 'Keine (Antwort bleibt in Arbeits-Session)');
      enabledCheckbox.checked = job.isEnabled;

      updateCronPreview(cronInput, cronPreview);
      showCronjobStatus(statusBox, job);

      // Löschen
      deleteBtn.addEventListener('click', async () => {
        if (!confirm('Cronjob wirklich löschen?')) return;
        await apiDeleteCronjob(params.id);
        showToast('Cronjob gelöscht');
        navigateTo('dashboard');
      });

      // Jetzt ausführen
      runBtn.addEventListener('click', () => withButtonLoading(runBtn, 'Läuft...', async () => {
        try {
          const result = await apiRunCronjob(params.id);
          if (result.status === 'success') {
            showToast('Cronjob erfolgreich ausgeführt');
          } else {
            showToast('Fehler: ' + (result.error || 'Unbekannt'), 'error');
          }
          const updated = await apiGetCronjob(params.id);
          if (updated) showCronjobStatus(statusBox, updated);
        } catch (e) {
          showToast('Fehler: ' + e.message, 'error');
        }
      }));
    }

    // Speichern
    saveBtn.addEventListener('click', async () => {
      const data = {
        name: nameInput.value.trim(),
        sessionId: sessionSelect.value,
        cronExpression: cronInput.value.trim(),
        prompt: promptInput.value.trim(),
        notifySessionId: notifySelect.value,
        isEnabled: enabledCheckbox.checked
      };

      if (!data.name || !data.sessionId || !data.cronExpression || !data.prompt) {
        showToast('Bitte alle Felder ausfüllen', 'error');
        return;
      }

      await withButtonLoading(saveBtn, 'Speichern...', async () => {
        try {
          if (isEdit) {
            await apiUpdateCronjob(params.id, data);
            showToast('Cronjob gespeichert');
            const updated = await apiGetCronjob(params.id);
            if (updated) showCronjobStatus(statusBox, updated);
          } else {
            const created = await apiCreateCronjob(data);
            showToast('Cronjob erstellt');
            navigateTo('cronjob', { id: created.cronjobId });
          }
        } catch (e) {
          showToast('Fehler: ' + e.message, 'error');
        }
      });
    });
  }
});

function openSessionPickerModal(sessions, agentMap, currentId, onSelect, options) {
  options = options || {};
  const filterWithAgent = options.filterWithAgent || false;
  const filtered = filterWithAgent ? sessions.filter(s => s.agentId) : sessions;
  const items = filtered.map(s => {
    s._pickerId = s.sessionId;
    return s;
  });
  _openPickerModal(options.title || 'Session auswählen', items, currentId, onSelect, {
    noneLabel: options.noneLabel || 'Keine Session',
    noneIcon: options.noneIcon || 'fa-ban',
    buildCard: (s) => buildSessionCard(s, s.agentId ? agentMap[s.agentId] : null)
  });
}

function updateCronPreview(input, preview) {
  const expr = input.value.trim();
  if (!expr) {
    preview.textContent = '';
    return;
  }
  const desc = describeCron(expr);
  if (desc) {
    preview.textContent = desc;
    preview.style.color = '';
  } else {
    preview.textContent = 'Ungültige Cron-Expression';
    preview.style.color = 'var(--color-error)';
  }
}

function describeCron(expr) {
  try {
    const parts = expr.split(/\s+/);
    if (parts.length < 5 || parts.length > 5) return null;

    const [min, hour, dom, month, dow] = parts;

    // Einfache Fälle beschreiben
    const dowNames = { '0': 'So', '1': 'Mo', '2': 'Di', '3': 'Mi', '4': 'Do', '5': 'Fr', '6': 'Sa', '7': 'So' };

    let desc = '';

    const tz = 'Europe/Berlin';

    if (dom === '*' && month === '*' && dow === '*') {
      if (min !== '*' && hour !== '*') {
        desc = `Täglich um ${hour.padStart(2, '0')}:${min.padStart(2, '0')} Uhr`;
      } else if (hour === '*' && min === '0') {
        desc = 'Jede Stunde';
      } else if (hour === '*' && min === '*') {
        desc = 'Jede Minute';
      } else if (hour !== '*') {
        desc = `Täglich, stündlich um ${hour} Uhr`;
      }
    } else if (dom === '*' && month === '*' && dow !== '*') {
      // Ranges wie 1-5 auflösen
      let dayParts = [];
      for (const part of dow.split(',')) {
        if (part.includes('-')) {
          const [from, to] = part.split('-');
          dayParts.push(`${dowNames[from] || from}–${dowNames[to] || to}`);
        } else {
          dayParts.push(dowNames[part] || part);
        }
      }
      const days = dayParts.join(', ');
      if (min !== '*' && hour !== '*') {
        desc = `${days} um ${hour.padStart(2, '0')}:${min.padStart(2, '0')} Uhr`;
      } else {
        desc = `An: ${days}`;
      }
    } else if (dow === '*' && month === '*' && dom !== '*') {
      desc = `Am ${dom}. jedes Monats`;
      if (min !== '*' && hour !== '*') {
        desc += ` um ${hour.padStart(2, '0')}:${min.padStart(2, '0')} Uhr`;
      }
    }

    if (!desc) {
      desc = `${expr} (5-Feld Cron)`;
    }

    return desc;
  } catch {
    return null;
  }
}

function showCronjobStatus(box, job) {
  box.hidden = false;
  const parts = [];

  if (job.isEnabled) {
    parts.push('<span class="status-active"><i class="fa fa-check-circle"></i> Aktiv</span>');
  } else {
    parts.push('<span class="status-inactive"><i class="fa fa-pause-circle"></i> Pausiert</span>');
  }

  if (job.nextRunAt) {
    const next = new Date(job.nextRunAt);
    parts.push(`<span><i class="fa fa-clock-o"></i> Nächste Ausführung: ${next.toLocaleString('de-AT')}</span>`);
  }

  if (job.lastRunAt) {
    const last = new Date(job.lastRunAt);
    const statusIcon = job.lastRunStatus === 'success' ? '✅' : '❌';
    parts.push(`<span>${statusIcon} Letzte Ausführung: ${last.toLocaleString('de-AT')}</span>`);
    if (job.lastRunStatus === 'error' && job.lastRunError) {
      parts.push(`<span class="status-error"><i class="fa fa-exclamation-triangle"></i> ${esc(job.lastRunError)}</span>`);
    }
  }

  if (job.sessionName) {
    parts.push(`<span><i class="fa fa-comment"></i> Session: ${esc(job.sessionName)}</span>`);
  }

  if (job.notifySessionName) {
    parts.push(`<span><i class="fa fa-bell"></i> Benachrichtigung → ${esc(job.notifySessionName)}</span>`);
  }

  box.innerHTML = parts.join('');
}