// ── 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 toolChoiceEl = document.getElementById('agentToolChoice');
    const autoCommitEl = document.getElementById('agentAutoCommit');
    const useSoulEl = document.getElementById('agentUseSoul');
    const useIdentityEl = document.getElementById('agentUseIdentity');
    const useUserInfoEl = document.getElementById('agentUseUserInfo');
    const useMemoryEl = document.getElementById('agentUseMemory');
    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');
    const commandsList = document.getElementById('agentCommandsList');
    const addCommandBtn = document.getElementById('agentAddCommandBtn');
    const filesSection = document.getElementById('agentFilesSection');
    const filesBtn = document.getElementById('agentFilesBtn');
    const skillsSection = document.getElementById('agentSkillsSection');
    const skillList = document.getElementById('agentSkillList');

    _agentAvatarData = null;

    if (agent) {
      title.textContent = agent.name;
      nameEl.value = agent.name || '';
      descEl.value = agent.description || '';
      modelEl.value = agent.model || 'sonnet';
      toolChoiceEl.checked = (agent.toolChoice || 'any') === 'any';
      autoCommitEl.value = agent.autoCommit || '';
      useSoulEl.checked = agent.useSoul !== false;
      useIdentityEl.checked = agent.useIdentity !== false;
      useUserInfoEl.checked = agent.useUserInfo !== false;
      useMemoryEl.checked = agent.useMemory !== false;
      _agentAvatarData = agent.avatar || null;
      deleteBtn.hidden = false;
      filesSection.hidden = false;

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

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

      // Skills laden
      const [allSkills, agentSkills] = await Promise.all([
        apiGetSkills(),
        apiGetAgentSkills(agentId)
      ]);
      const assignedSlugs = agentSkills.map(s => s.slug);
      skillsSection.hidden = false;
      renderSkillCheckboxes(skillList, allSkills, assignedSlugs);
    } else {
      // Neue Agents: Skills-Liste auch anzeigen
      const allSkills = await apiGetSkills();
      if (allSkills.length > 0) {
        skillsSection.hidden = false;
        renderSkillCheckboxes(skillList, allSkills, []);
      }
    }

    // Agent-Dateien öffnen
    filesBtn.addEventListener('click', () => {
      openFileExplorer({ agentId: agentId });
    });

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

    // 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,
        toolChoice: toolChoiceEl.checked ? 'any' : 'auto',
        autoCommit: autoCommitEl.value,
        useSoul: useSoulEl.checked,
        useIdentity: useIdentityEl.checked,
        useUserInfo: useUserInfoEl.checked,
        useMemory: useMemoryEl.checked,
        avatar: _agentAvatarData,
        customCommands: getCommandsFromUI(commandsList)
      };

      if (isNew) {
        const created = await apiCreateAgent(data);
        // Skills zuweisen falls welche ausgewählt
        const selectedSlugs = getSelectedSkills(skillList);
        if (selectedSlugs.length > 0) {
          await apiSetAgentSkills(created.agentId, selectedSlugs);
        }
      } else {
        await apiUpdateAgent(agentId, data);
        // Skills aktualisieren
        const selectedSlugs = getSelectedSkills(skillList);
        await apiSetAgentSkills(agentId, selectedSlugs);
      }
      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;
  }
});

function renderSkillCheckboxes(container, allSkills, assignedSlugs) {
  container.innerHTML = '';
  if (allSkills.length === 0) {
    container.innerHTML = '<div class="skill-empty">Keine Skills verfügbar. Lege Skills in <code>data/skills/</code> ab.</div>';
    return;
  }
  for (const skill of allSkills) {
    const checked = assignedSlugs.includes(skill.slug) ? 'checked' : '';
    const disabled = !skill.hasPromptMd ? 'disabled' : '';
    const version = skill.version ? ` <span class="skill-version">v${skill.version}</span>` : '';
    const desc = skill.description ? `<span class="skill-desc">${skill.description}</span>` : '';
    const warning = !skill.hasPromptMd ? '<span class="skill-warning">⚠ PROMPT.md fehlt – Skill nicht verwendbar</span>' : '';
    const row = document.createElement('label');
    row.className = 'skill-item' + (!skill.hasPromptMd ? ' skill-unavailable' : '');
    row.innerHTML = `
      <input type="checkbox" value="${skill.slug}" ${checked} ${disabled}>
      <span class="skill-name">${skill.name}${version}</span>
      ${desc}
      ${warning}
    `;
    container.appendChild(row);
  }
}

function getSelectedSkills(container) {
  return Array.from(container.querySelectorAll('input[type="checkbox"]:checked'))
    .map(cb => cb.value);
}