// API Client for SimpleNote Web

const API_BASE = '/api/v1';

class ApiClient {
  constructor() {
    this.token = localStorage.getItem('sn_token');
  }

  setToken(token) {
    this.token = token;
    if (token) {
      localStorage.setItem('sn_token', token);
    } else {
      localStorage.removeItem('sn_token');
    }
  }

  getHeaders() {
    const headers = {
      'Content-Type': 'application/json'
    };
    if (this.token) {
      headers['Authorization'] = `Bearer ${this.token}`;
    }
    return headers;
  }

  async request(method, path, body = null) {
    const options = {
      method,
      headers: this.getHeaders()
    };
    if (body) {
      options.body = JSON.stringify(body);
    }

    const response = await fetch(`${API_BASE}${path}`, options);

    if (!response.ok) {
      const error = await response.json().catch(() => ({ message: 'Request failed' }));
      throw new Error(error.message || `HTTP ${response.status}`);
    }

    return response.json();
  }

  get(path) { return this.request('GET', path); }
  post(path, body) { return this.request('POST', path, body); }
  put(path, body) { return this.request('PUT', path, body); }
  delete(path) { return this.request('DELETE', path); }

  // ===== Auth =====
  async login(token) {
    try {
      this.setToken(token);  // Set token BEFORE making request
      const data = await this.get('/auth/verify');
      return data;
    } catch (e) {
      this.setToken(null);
      throw e;
    }
  }

  // ===== Documents =====
  getDocuments(params = {}) {
    const query = new URLSearchParams(params).toString();
    return this.get(`/documents${query ? '?' + query : ''}`);
  }

  getDocument(id) {
    return this.get(`/documents/${id}`);
  }

  createDocument(data) {
    return this.post('/documents', data);
  }

  updateDocument(id, data) {
    return this.put(`/documents/${id}`, data);
  }

  deleteDocument(id) {
    return this.delete(`/documents/${id}`);
  }

  exportDocument(id) {
    return fetch(`${API_BASE}/documents/${id}/export`, {
      headers: this.getHeaders()
    }).then(r => r.text());
  }

  addDocumentTags(documentId, tags) {
    return this.post(`/documents/${documentId}/tags`, { tags });
  }

  moveDocumentToFolder(documentId, folderId) {
    return this.put(`/documents/${documentId}`, { folderId });
  }

  // ===== Tags =====
  getTags() {
    return this.get('/tags');
  }

  // GET /tags/:tag - get documents by tag
  getDocumentsByTag(tag) {
    return this.get(`/tags/${encodeURIComponent(tag)}`);
  }

  // ===== Libraries =====
  getLibraries() {
    return this.get('/libraries');
  }

  getLibrary(id) {
    return this.get(`/libraries/${id}`);
  }

  createLibrary(data) {
    return this.post('/libraries', data);
  }

  updateLibrary(id, data) {
    return this.put(`/libraries/${id}`, data);
  }

  deleteLibrary(id) {
    return this.delete(`/libraries/${id}`);
  }

  // GET /libraries/:id/tree
  getLibraryTree(id) {
    return this.get(`/libraries/${id}/tree`);
  }

  // GET /libraries/:id/documents
  getLibraryDocuments(id) {
    return this.get(`/libraries/${id}/documents`);
  }

  // ===== Projects =====
  getProjects() {
    return this.get('/projects');
  }

  getProject(id) {
    return this.get(`/projects/${id}`);
  }

  createProject(data) {
    return this.post('/projects', data);
  }

  updateProject(id, data) {
    return this.put(`/projects/${id}`, data);
  }

  deleteProject(id) {
    return this.delete(`/projects/${id}`);
  }

  // GET /projects/:id/tree
  getProjectTree(id) {
    return this.get(`/projects/${id}/tree`);
  }

  // GET /projects/:id/documents
  getProjectDocuments(id) {
    return this.get(`/projects/${id}/documents`);
  }

  // ===== Folders =====
  getFolders(project = null, parentId = null) {
    const params = new URLSearchParams();
    if (project) params.append('project', project);
    if (parentId) params.append('parentId', parentId);
    const query = params.toString();
    return this.get(`/folders${query ? '?' + query : ''}`);
  }

  getFolder(id) {
    return this.get(`/folders/${id}`);
  }

  createFolder(data) {
    return this.post('/folders', data);
  }

  updateFolder(id, data) {
    return this.put(`/folders/${id}`, data);
  }

  deleteFolder(id) {
    return this.delete(`/folders/${id}`);
  }

  // GET /folders/:id/documents
  getFolderDocuments(id) {
    return this.get(`/folders/${id}/documents`);
  }

  // GET /folders/:id/tree
  getFolderTree(id) {
    return this.get(`/folders/${id}/tree`);
  }
}

export const api = new ApiClient();