// ── Session Edit Page ──

let _sessionImageData = null;
let _sessionPasteHandler = null;

function _createCommandRow(container, name = '', command = '') {
  const item = document.createElement('div');
  item.className = 'custom-command-item';
  item.innerHTML = `
    <div class="custom-command-fields">
      <input type="text" class="cmd-name" placeholder="Name (z.B. Deploy)" value="${_escAttr(name)}">
      <input type="text" class="cmd-command" placeholder="Befehl (z.B. ./deploy.sh)" value="${_escAttr(command)}">
    </div>
    <button type="button" class="remove-cmd-btn">✕</button>
  `;
  item.querySelector('.remove-cmd-btn').addEventListener('click', () => item.remove());
  container.appendChild(item);
}

function _escAttr(str) {
  return str.replace(/&/g, '&amp;').replace(/"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
}

function _getCommandsFromUI(container) {
  const items = container.querySelectorAll('.custom-command-item');
  const commands = [];
  for (const item of items) {
    const name = item.querySelector('.cmd-name').value.trim();
    const command = item.querySelector('.cmd-command').value.trim();
    if (name || command) commands.push({ name, command });
  }
  return commands.length > 0 ? commands : 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 imagePreview = document.getElementById('sessionImagePreview');
    const imageInput = document.getElementById('sessionImageInput');
    const imageBtn = document.getElementById('sessionImageBtn');
    const imageClearBtn = document.getElementById('sessionImageClearBtn');
    const saveBtn = document.getElementById('sessionSaveBtn');
    const cancelBtn = document.getElementById('sessionCancelBtn');
    const deleteBtn = document.getElementById('sessionDeleteBtn');
    const openChatBtn = document.getElementById('openChatBtn');
    const commandsList = document.getElementById('customCommandsList');
    const addCommandBtn = document.getElementById('addCommandBtn');

    _sessionImageData = null;

    if (session) {
      titleEl.textContent = session.name || 'Unbenannt';
      nameEl.value = session.name || '';
      descEl.value = session.description || '';
      contextEl.value = session.context || '';
      workspaceEl.value = session.workspace || '';
      _sessionImageData = session.image || null;
      deleteBtn.hidden = false;
      openChatBtn.disabled = false;

      if (session.image) {
        imagePreview.innerHTML = `<img src="${session.image}" alt="">`;
      }

      // Custom Commands laden
      if (session.customCommands) {
        try {
          const cmds = typeof session.customCommands === 'string'
            ? JSON.parse(session.customCommands)
            : session.customCommands;
          for (const cmd of cmds) {
            _createCommandRow(commandsList, cmd.name || '', cmd.command || '');
          }
        } catch (e) { /* ignore parse errors */ }
      }
    } else {
      titleEl.textContent = 'Neue Session';
      deleteBtn.hidden = true;
      openChatBtn.disabled = true;
    }

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

    // Agents laden
    const agents = await apiGetAgents();
    agentSelect.innerHTML = '<option value="">-- Kein Agent --</option>';
    for (const a of agents) {
      const opt = document.createElement('option');
      opt.value = a.agentId;
      opt.textContent = `${a.name} (${a.model})`;
      agentSelect.appendChild(opt);
    }
    if (session && session.agentId) agentSelect.value = session.agentId;

    // Bild Upload
    imageBtn.addEventListener('click', () => imageInput.click());
    imageInput.addEventListener('change', () => {
      const file = imageInput.files[0];
      if (!file) return;
      const reader = new FileReader();
      reader.onload = () => {
        _sessionImageData = reader.result;
        imagePreview.innerHTML = `<img src="${reader.result}" alt="">`;
      };
      reader.readAsDataURL(file);
    });

    imageClearBtn.addEventListener('click', () => {
      _sessionImageData = null;
      imagePreview.innerHTML = '?';
      imageInput.value = '';
    });

    // Bild Paste (Ctrl+V)
    document.addEventListener('paste', _sessionPasteHandler = (e) => {
      const items = e.clipboardData?.items;
      if (!items) return;
      for (const item of items) {
        if (item.type.startsWith('image/')) {
          e.preventDefault();
          const file = item.getAsFile();
          if (!file) return;
          const reader = new FileReader();
          reader.onload = () => {
            _sessionImageData = reader.result;
            imagePreview.innerHTML = `<img src="${reader.result}" alt="">`;
          };
          reader.readAsDataURL(file);
          return;
        }
      }
    });

    // Workspace Browse
    const workspaceBrowse = document.getElementById('sessionWorkspaceBrowse');
    if (workspaceBrowse) {
      workspaceBrowse.addEventListener('click', () => {
        openFolderBrowser({
          startPath: workspaceEl.value.trim() || '/',
          onSelect(path) {
            workspaceEl.value = path;
          }
        });
      });
    }

    // Speichern
    saveBtn.addEventListener('click', async () => {
      const commands = _getCommandsFromUI(commandsList);
      const data = {
        name: nameEl.value.trim() || 'Unbenannt',
        description: descEl.value.trim(),
        image: _sessionImageData,
        agentId: agentSelect.value || null,
        context: contextEl.value || null,
        workspace: workspaceEl.value.trim() || null,
        customCommands: commands
      };

      if (isNew) {
        await apiCreateSession(data);
      } else {
        await apiUpdateSession(sessionId, data);
      }
      navigateTo('dashboard');
    });

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

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

    // Chat öffnen
    openChatBtn.addEventListener('click', () => {
      navigateTo('chat', { id: sessionId });
    });
  },
  destroy() {
    if (_sessionPasteHandler) {
      document.removeEventListener('paste', _sessionPasteHandler);
      _sessionPasteHandler = null;
    }
    _sessionImageData = null;
  }
});