// ── Agent Page ──

let _agentAvatarData = null;
let _agentPasteHandler = null;

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

    if (!isNew) {
      agent = await apiGetAgent(agentId);
      if (!agent) return navigateTo('dashboard');
    }

    const title = document.getElementById('agentPageTitle');
    const nameEl = document.getElementById('agentName');
    const descEl = document.getElementById('agentDescription');
    const modelEl = document.getElementById('agentModel');
    const personaEl = document.getElementById('agentPersona');
    const instructionsEl = document.getElementById('agentInstructions');
    const avatarPreview = document.getElementById('avatarPreview');
    const avatarInput = document.getElementById('avatarInput');
    const avatarBtn = document.getElementById('avatarBtn');
    const avatarClearBtn = document.getElementById('avatarClearBtn');
    const saveBtn = document.getElementById('agentSaveBtn');
    const cancelBtn = document.getElementById('agentCancelBtn');
    const deleteBtn = document.getElementById('agentDeleteBtn');

    _agentAvatarData = null;

    if (agent) {
      title.textContent = agent.name;
      nameEl.value = agent.name || '';
      descEl.value = agent.description || '';
      modelEl.value = agent.model || 'sonnet';
      personaEl.value = agent.persona || '';
      instructionsEl.value = agent.instructions || '';
      _agentAvatarData = agent.avatar || null;
      deleteBtn.hidden = false;

      if (agent.avatar) {
        avatarPreview.innerHTML = `<img src="${agent.avatar}" alt="Avatar">`;
      }
    }

    // Avatar Upload
    avatarBtn.addEventListener('click', () => avatarInput.click());
    avatarInput.addEventListener('change', () => {
      const file = avatarInput.files[0];
      if (!file) return;
      const reader = new FileReader();
      reader.onload = () => {
        _agentAvatarData = reader.result;
        avatarPreview.innerHTML = `<img src="${reader.result}" alt="Avatar">`;
      };
      reader.readAsDataURL(file);
    });

    avatarClearBtn.addEventListener('click', () => {
      _agentAvatarData = null;
      avatarPreview.innerHTML = '?';
      avatarInput.value = '';
    });

    // Avatar Paste (Ctrl+V)
    document.addEventListener('paste', _agentPasteHandler = (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 = () => {
            _agentAvatarData = reader.result;
            avatarPreview.innerHTML = `<img src="${reader.result}" alt="Avatar">`;
          };
          reader.readAsDataURL(file);
          return;
        }
      }
    });

    // Speichern
    saveBtn.addEventListener('click', async () => {
      const data = {
        name: nameEl.value.trim() || 'Unbenannt',
        description: descEl.value.trim(),
        model: modelEl.value,
        persona: personaEl.value,
        instructions: instructionsEl.value,
        avatar: _agentAvatarData
      };

      if (isNew) {
        await apiCreateAgent(data);
      } else {
        await apiUpdateAgent(agentId, data);
      }
      navigateTo('dashboard');
    });

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

    // Löschen
    deleteBtn.addEventListener('click', async () => {
      if (!confirm('Agent wirklich löschen?')) return;
      await apiDeleteAgent(agentId);
      navigateTo('dashboard');
    });
  },
  destroy() {
    if (_agentPasteHandler) {
      document.removeEventListener('paste', _agentPasteHandler);
      _agentPasteHandler = null;
    }
    _agentAvatarData = null;
  }
});