const BASE = import.meta.env?.VITE_API_URL ?? '';

const req = async (path, opts = {}) => {
  const token = localStorage.getItem('casa_token');
  const headers = { ...(opts.headers || {}) };
  if (token) headers['Authorization'] = `Bearer ${token}`;
  if (opts.json) { 
    headers['Content-Type'] = 'application/json'; 
    opts.body = JSON.stringify(opts.json); 
    delete opts.json; 
  }
  const r = await fetch(`${BASE}${path}`, { ...opts, headers });
  if (!r.ok) { 
    const e = await r.json().catch(() => ({ detail: r.statusText })); 
    throw new Error(e.detail || 'Request failed'); 
  }
  return r.json();
};

const fd = (obj) => { 
  const f = new FormData(); 
  Object.entries(obj).forEach(([k,v]) => v != null && f.append(k, typeof v === 'object' ? JSON.stringify(v) : String(v))); 
  return f; 
};

export const api = {
  // Health
  health: () => req('/health'),
  
  // Auth
  register: (b) => req('/api/auth/register', { method:'POST', json:b }),
  login: (b) => req('/api/auth/login', { method:'POST', json:b }),
  me: () => req('/api/auth/me'),
  logout: () => req('/api/auth/logout', { method:'POST' }),
  
  // Designs
  saveDesign: (d) => req('/api/auth/save-design', { method:'POST', json:{ design:d } }),
  savedDesigns: () => req('/api/auth/saved-designs'),
  getDesign: (id) => req(`/api/designs/${id}`),
  getPublicDesigns: (params) => req('/api/designs', { method:'GET', json:params }),
  likeDesign: (id) => req(`/api/designs/${id}/like`, { method:'POST' }),
  addComment: (id, comment) => req(`/api/designs/${id}/comments`, { method:'POST', json:comment }),
  getComments: (id) => req(`/api/designs/${id}/comments`),
  
  // Room Analysis
  analyzeRoom: (f) => { 
    const form = new FormData(); 
    form.append('file', f); 
    return req('/api/rooms/analyze', { method:'POST', body:form }); 
  },
  
  // Design Generation
  generateDesign: (p) => req('/api/designs/generate', { method:'POST', body:fd(p) }),
  explanation: (p) => req('/api/design-explanation', { method:'POST', body:fd(p) }),
  wallFinish: (p) => req('/api/wall-finish', { method:'POST', body:fd(p) }),
  
  // Style Tools
  styleQuiz: (answers) => req('/api/quiz/submit', { method:'POST', json:{ answers } }),
  getQuizQuestions: () => req('/api/quiz/questions'),
  moodBoard: (p) => req('/api/mood-board', { method:'POST', body:fd(p) }),
  budgetBreakdown: (p) => req('/api/budget-breakdown', { method:'POST', body:fd(p) }),
  
  // Catalog with affiliate links
  getCatalog: (params) => {
    const query = new URLSearchParams(params).toString();
    return req(`/api/catalog${query ? '?' + query : ''}`);
  },
  getCategories: () => req('/api/catalog/categories'),
  getBrands: () => req('/api/catalog/brands'),
  getCatalogItem: (id) => req(`/api/catalog/${id}`),
  
  // Export
  exportDesign: (designId, format) => req('/api/export/pdf', { method:'POST', json:{ design_id:designId, format } }),
  getExportStatus: (exportId) => req(`/api/export/status/${exportId}`),
  
  // Stats
  getDesignStats: () => req('/api/stats/designs'),
  
  // 3D
  generate3DModel: (designData) => req('/api/designs/3d', { method:'POST', json:designData }),
  
  // Style Transfer
  styleTransfer: (image, style) => {
    const form = new FormData();
    form.append('image', image);
    form.append('style', style);
    return req('/api/style-transfer', { method:'POST', body:form });
  },
  
  // Reviews
  getItemReviews: (itemId) => req(`/api/catalog/${itemId}/reviews`),
  submitReview: (itemId, rating, comment) => 
    req(`/api/catalog/${itemId}/reviews`, { method:'POST', json:{ rating, comment } }),
};