// ── Session Edit Page ──

let _sessionAvatarEditor = null;
let _sessionContextMde = null;

registerPage('session', {
  async init(params) {
    const sessionId = params.id;
    const isNew = !sessionId;
    let session = null;

    if (!isNew) {
      session = await apiGetSession(sessionId);
      if (!session) return navigateTo('dashboard');
    }

    const titleEl = document.getElementById('sessionPageTitle');
    const nameEl = document.getElementById('sessionName');
    const descEl = document.getElementById('sessionDescription');
    const contextEl = document.getElementById('sessionContext');
    const workspaceEl = document.getElementById('sessionWorkspace');
    const agentSelect = document.getElementById('agentSelect');
    const agentSelectCard = document.getElementById('agentSelectCard');
    const preparerAgentSelect = document.getElementById('preparerAgentSelect');
    const preparerAgentSelectCard = document.getElementById('preparerAgentSelectCard');
    const reviewAgentSelect = document.getElementById('reviewAgentSelect');
    const reviewAgentSelectCard = document.getElementById('reviewAgentSelectCard');
    const reviewIterationsRow = document.getElementById('reviewIterationsRow');
    const maxReviewIterationsEl = document.getElementById('maxReviewIterations');
    const finalizerAgentSelect = document.getElementById('finalizerAgentSelect');
    const finalizerAgentSelectCard = document.getElementById('finalizerAgentSelectCard');
    const panelAgentsCard = document.getElementById('panelAgentsCard');
    const panelAgentIdsEl = document.getElementById('panelAgentIds');
    const moaLayersEl = document.getElementById('moaLayers');
    const imagePreview = document.getElementById('sessionImagePreview');
    const saveBtn = document.getElementById('sessionSaveBtn');
    const cancelBtn = document.getElementById('sessionCancelBtn');
    const deleteBtn = document.getElementById('sessionDeleteBtn');

    // Rücksprung nach Speichern/Abbrechen: zurück zum Chat, wenn von dort geöffnet – sonst Dashboard
    const goBack = () => {
      if (params.returnTo === 'chat' && params.returnId) {
        navigateTo('chat', { id: params.returnId });
      } else {
        navigateTo('dashboard');
      }
    };
    const commandsList = document.getElementById('customCommandsList');
    const addCommandBtn = document.getElementById('addCommandBtn');
    const mcpServersList = document.getElementById('mcpServersList');
    const addMcpServerBtn = document.getElementById('addMcpServerBtn');
    const ownerRow = document.getElementById('sessionOwnerRow');
    const userSelectCard = document.getElementById('sessionUserSelectCard');
    const userSelect = document.getElementById('sessionUserSelect');
    const more = document.querySelector('.more');

    // Avatar Editor initialisieren
    _sessionAvatarEditor = AvatarEditor.init({
      previewEl: imagePreview,
      initialImage: (session && session.image) || null,
      initialScale: (session && session.avatarScale) || 1,
      initialOffsetX: (session && session.avatarOffsetX) || 0,
      initialOffsetY: (session && session.avatarOffsetY) || 0
    });

    if (session) {
      titleEl.textContent = session.name || 'Unbenannt';
      nameEl.value = session.name || '';
      descEl.value = session.description || '';
      workspaceEl.value = session.workspace || '';
      deleteBtn.hidden = false;

      // Custom Commands laden
      loadCommandsIntoUI(commandsList, session.customCommands);

      // MCP-Server
      loadMcpServersIntoUI(mcpServersList, session.mcpServers);
    } else {
      titleEl.textContent = 'Neue Session';
      deleteBtn.hidden = true;
    }

    // EasyMDE für Kontext
    _sessionContextMde = createMDE(contextEl, {
      initialValue: (session && session.context) || '',
      placeholder: 'Zusätzlicher Kontext für den System-Prompt (optional)'
    });

    // Befehl hinzufügen
    addCommandBtn.addEventListener('click', () => createCommandRow(commandsList));

    // MCP-Server hinzufügen
    addMcpServerBtn.addEventListener('click', () => createMcpServerRow(mcpServersList));

    // Telegram-Section nur für existierende Sessions
    if (!isNew) {
      initSessionTelegram(sessionId, session);
    }

    // Agents laden + Skills parallel
    const agents = await apiGetAvailableAgents();
    const agentMap = {};
    for (const a of agents) agentMap[a.agentId] = a;

    const agentSkillsMap = {};
    for (const a of agents) {
      agentSkillsMap[a.agentId] = a.skills || [];
    }

    function renderAgentInCard(cardEl, agent, emptyIcon, emptyText) {
      const inner = agent ? buildAgentCard(agent, agentSkillsMap[agent.agentId] || []) : null;
      _renderCardPreview(cardEl, inner, emptyIcon, emptyText, 'agent-select-change');
    }

    function updateReviewVisibility() {
      reviewIterationsRow.hidden = !reviewAgentSelect.value;
    }

    // Helper: Agent-Picker für eine Rolle einrichten (Initial-Rendering + Click-Handler)
    function setupAgentPicker(cardEl, selectEl, initialId, emptyIcon, emptyText, onChange) {
      if (initialId) {
        selectEl.value = initialId;
        renderAgentInCard(cardEl, agentMap[initialId] || null, emptyIcon, emptyText);
      } else {
        renderAgentInCard(cardEl, null, emptyIcon, emptyText);
      }
      cardEl.addEventListener('click', () => {
        openAgentPickerModal(agents, agentSkillsMap, selectEl.value, (selectedId) => {
          selectEl.value = selectedId || '';
          renderAgentInCard(cardEl, selectedId ? agentMap[selectedId] : null, emptyIcon, emptyText);
          if (onChange) onChange(selectedId);
        });
      });
    }

    setupAgentPicker(agentSelectCard, agentSelect, session && session.agentId, 'fa-user-circle-o', 'Kein Agent ausgewählt');
    setupAgentPicker(preparerAgentSelectCard, preparerAgentSelect, session && session.preparerAgentId, 'fa-filter', 'Kein Vorbereiter-Agent');
    setupAgentPicker(reviewAgentSelectCard, reviewAgentSelect, session && session.reviewAgentId, 'fa-check-circle-o', 'Kein Review-Agent', updateReviewVisibility);
    if (session && session.reviewAgentId) maxReviewIterationsEl.value = session.maxReviewIterations || 3;
    updateReviewVisibility();
    setupAgentPicker(finalizerAgentSelectCard, finalizerAgentSelect, session && session.finalizerAgentId, 'fa-flag-checkered', 'Kein Finalizer-Agent');

    // Multi-Modell-Panel (Fusion): Modus + Mehrfach-Agenten-Picker
    function renderPanelInCard() {
      var ids = (panelAgentIdsEl.value || '').split(',').map(function(s){ return s.trim(); }).filter(Boolean);
      if (ids.length === 0) {
        panelAgentsCard.innerHTML = '<div class="agent-select-empty"><i class="fa fa-users"></i> Keine Panel-Agenten</div>';
        return;
      }
      var chips = ids.map(function(id) {
        var a = agentMap[id];
        var label = a ? a.name : id.slice(0, 8);
        var model = a ? ((typeof prettyModelName === 'function') ? prettyModelName(a.model) : a.model) : '';
        return '<span class="badge">' + esc(label) + (model ? ' · ' + esc(model) : '') + '</span>';
      }).join(' ');
      panelAgentsCard.innerHTML = '<div>' + chips + '</div>'
        + '<span class="agent-select-change"><i class="fa fa-pencil"></i></span>';
    }
    // Panel-Modus (Fusion/MoA) wird on-demand im Chat gewählt (nicht mehr hier persistiert).
    // In den Settings legt man nur noch die Panel-Mitglieder + MoA-Runden fest (immer sichtbar).
    panelAgentIdsEl.value = (session && session.panelAgentIds) || '';
    if (moaLayersEl) moaLayersEl.value = (session && session.moaLayers) || 2;
    renderPanelInCard();
    panelAgentsCard.addEventListener('click', function() {
      var currentIds = (panelAgentIdsEl.value || '').split(',').map(function(s){ return s.trim(); }).filter(Boolean);
      openMultiAgentPickerModal(agents, agentSkillsMap, currentIds, function(newIds) {
        panelAgentIdsEl.value = newIds.join(',');
        renderPanelInCard();
      });
    });

    // User-Zuweisung (jeder Besitzer, nur für bestehende Sessions)
    if (!isNew) {
      initSessionUserPicker(ownerRow, userSelectCard, userSelect, session && session.userId);
    }

    initMoreButton(more);

    // Workspace Browse
    const workspaceBrowse = document.getElementById('sessionWorkspaceBrowse');
    if (workspaceBrowse) {
      workspaceBrowse.addEventListener('click', () => {
        const defaultPath = (currentUser && currentUser.defaultPath) || '';
        const currentVal = workspaceEl.value.trim();
        // Für den Folder-Browser den absoluten Startpfad zusammenbauen
        let startPath = '/';
        if (defaultPath && currentVal) {
          startPath = defaultPath.replace(/\/+$/, '') + '/' + currentVal;
        } else if (defaultPath) {
          startPath = defaultPath;
        } else if (currentVal) {
          startPath = currentVal;
        }
        openFolderBrowser({
          startPath,
          basePath: defaultPath || null,
          onSelect(absolutePath) {
            // Relativen Pfad zum DefaultPath berechnen
            if (defaultPath && absolutePath.startsWith(defaultPath)) {
              let rel = absolutePath.slice(defaultPath.length).replace(/^\/+/, '');
              workspaceEl.value = rel || '';
            } else {
              // Kein DefaultPath oder Pfad außerhalb → absoluten Pfad beibehalten (Legacy)
              workspaceEl.value = absolutePath;
            }
          }
        });
      });
    }

    // Speichern
    saveBtn.addEventListener('click', async () => {
      const commands = getCommandsFromUI(commandsList);
      const data = {
        name: nameEl.value.trim() || 'Unbenannt',
        description: descEl.value.trim(),
        image: _sessionAvatarEditor.getImage(),
        agentId: agentSelect.value || null,
        reviewAgentId: reviewAgentSelect.value || null,
        maxReviewIterations: parseInt(maxReviewIterationsEl.value) || 3,
        finalizerAgentId: finalizerAgentSelect.value || null,
        preparerAgentId: preparerAgentSelect.value || null,
        panelAgentIds: panelAgentIdsEl.value || null,
        moaLayers: moaLayersEl ? (parseInt(moaLayersEl.value, 10) || 2) : 2,
        context: _sessionContextMde.value().trim() || null,
        workspace: workspaceEl.value.trim() || null,
        customCommands: commands,
        avatarScale: _sessionAvatarEditor.getScale(),
        avatarOffsetX: _sessionAvatarEditor.getOffsetX(),
        avatarOffsetY: _sessionAvatarEditor.getOffsetY(),
        mcpServers: getMcpServersFromUI(mcpServersList)
      };

      // Session einem anderen Benutzer zuweisen. Wechselt der Besitzer tatsächlich,
      // erst rückfragen – die Session verschwindet danach aus der eigenen Übersicht.
      if (!isNew && userSelect.value && userSelect.value !== (session && session.userId)) {
        var targetLabel = userSelect.dataset.userLabel || 'einem anderen Benutzer';
        if (!confirm('Diese Session an "' + targetLabel + '" zuweisen? Sie verschwindet danach aus deiner Übersicht.')) {
          return;
        }
        data.userId = userSelect.value;
      }

      if (isNew) {
        await apiCreateSession(data);
      } else {
        await apiUpdateSession(sessionId, data);
        // Telegram-Config mitspeichern
        try {
          var tgBotId = document.getElementById('telegramBotSelect').value || '';
          var tgChatId = document.getElementById('sessionTelegramChatId').value.trim();
          await apiSessionTelegramSave(sessionId, tgBotId, tgChatId);
        } catch(e) {
          showToast('Session gespeichert, aber Telegram-Fehler: ' + e.message, 'error');
          return;
        }
      }
      goBack();
    });

    // Abbrechen
    cancelBtn.addEventListener('click', () => goBack());

    // Löschen
    deleteBtn.addEventListener('click', async () => {
      if (!confirm('Session wirklich löschen?')) return;
      await apiDeleteSession(sessionId);
      navigateTo('dashboard');
    });
  },
  destroy() {
    if (_sessionContextMde) {
      _sessionContextMde.toTextArea();
      _sessionContextMde = null;
    }
    if (_sessionAvatarEditor) {
      _sessionAvatarEditor.destroy();
      _sessionAvatarEditor = null;
    }
  }
});

function openAgentPickerModal(agents, agentSkillsMap, currentId, onSelect) {
  const items = agents.map(a => {
    a._pickerId = a.agentId;
    return a;
  });
  _openPickerModal('Agent auswählen', items, currentId, onSelect, {
    noneLabel: 'Kein Agent',
    buildCard: (a) => buildAgentCard(a, agentSkillsMap[a.agentId] || [])
  });
}

function openMultiAgentPickerModal(agents, agentSkillsMap, selectedIds, onConfirm) {
  const items = agents.map(a => {
    a._pickerId = a.agentId;
    return a;
  });
  _openMultiPickerModal('Panel-Agenten auswählen', items, selectedIds, onConfirm, {
    buildCard: (a) => buildAgentCard(a, agentSkillsMap[a.agentId] || [])
  });
}

function initSessionTelegram(sessionId, session) {
  var botSelectCard = document.getElementById('telegramBotSelectCard');
  var botSelect = document.getElementById('telegramBotSelect');
  var chatIdInput = document.getElementById('sessionTelegramChatId');
  var unlinkBtn = document.getElementById('sessionTelegramUnlink');

  // Unlink-Button
  unlinkBtn.addEventListener('click', function() {
    if (!chatIdInput.value) return;
    if (!confirm('Telegram-Verknüpfung wirklich lösen?')) return;
    chatIdInput.value = '';
    showToast('Chat-ID entfernt. Speichern nicht vergessen.', 'info');
  });

  // Config laden
  apiSessionTelegramGet(sessionId).then(function(config) {
    if (config.chatId) chatIdInput.value = config.chatId;
    if (config.telegramBotId) botSelect.value = config.telegramBotId;

    // Bot-Picker initialisieren
    initTelegramBotPicker(botSelectCard, botSelect, config.telegramBotId);
  }).catch(function() {
    initTelegramBotPicker(botSelectCard, botSelect, null);
  });
}

async function initTelegramBotPicker(cardEl, selectEl, currentBotId) {
  var bots = [];
  try {
    var result = await apiGetAvailableTelegramBots();
    if (Array.isArray(result)) bots = result;
  } catch(e) { /* ignore */ }
  var botMap = {};
  for (var i = 0; i < bots.length; i++) botMap[bots[i].botId] = bots[i];

  function renderBotInCard(bot) {
    var inner = bot ? buildTelegramBotCard(bot) : null;
    _renderCardPreview(cardEl, inner, 'fa-paper-plane', 'Kein Bot zugewiesen', 'tg-bot-select-change');
  }

  if (currentBotId && botMap[currentBotId]) {
    selectEl.value = currentBotId;
    renderBotInCard(botMap[currentBotId]);
  } else {
    renderBotInCard(null);
  }

  cardEl.addEventListener('click', function() {
    openTelegramBotPickerModal(bots, selectEl.value, function(selectedBotId) {
      selectEl.value = selectedBotId || '';
      renderBotInCard(selectedBotId ? botMap[selectedBotId] : null);
    });
  });
}

// Session einem anderen Benutzer zuweisen (jeder Besitzer seiner eigenen Session).
async function initSessionUserPicker(rowEl, cardEl, selectEl, currentOwnerId) {
  var users = [];
  try {
    var result = await apiGetUsers();
    if (Array.isArray(result)) users = result;
  } catch (e) {
    // Fehler beim Laden → Zuweisung bleibt versteckt
    return;
  }
  var userMap = {};
  for (var i = 0; i < users.length; i++) userMap[users[i].userId] = users[i];

  function userLabel(user) {
    return user ? (user.displayName || user.username || '') : '';
  }

  function renderUserInCard(user) {
    var inner = user ? buildUserCard(user) : null;
    _renderCardPreview(cardEl, inner, 'fa-user', 'Kein Benutzer', 'agent-select-change');
    selectEl.dataset.userLabel = userLabel(user);
  }

  selectEl.value = currentOwnerId || '';
  renderUserInCard(userMap[currentOwnerId] || null);
  rowEl.hidden = false;

  cardEl.addEventListener('click', function() {
    openUserPickerModal(users, selectEl.value, function(selectedUserId) {
      // "Keine Änderung" (null) ignorieren – eine Session muss immer einen Besitzer haben.
      if (!selectedUserId) return;
      selectEl.value = selectedUserId;
      renderUserInCard(userMap[selectedUserId] || null);
    });
  });
}

function openUserPickerModal(users, currentId, onSelect) {
  var items = users.map(function(u) {
    u._pickerId = u.userId;
    return u;
  });
  _openPickerModal('Benutzer auswählen', items, currentId, onSelect, {
    noneLabel: 'Keine Änderung',
    noneIcon: 'fa-user',
    buildCard: function(u) { return buildUserCard(u); }
  });
}