import type { Item, CreateItemBody, UpdateItemBody, StatsResponse, ItemFile } from './types';

const BASE = '/api';

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  const res = await fetch(`${BASE}${path}`, {
    headers: { 'Content-Type': 'application/json' },
    ...init,
  });
  if (!res.ok) {
    const body = await res.json().catch(() => ({}));
    throw new Error(body.error || `Request failed: ${res.status}`);
  }
  if (res.status === 204) return undefined as T;
  return res.json();
}

export const api = {
  // Items
  listItems(params?: Record<string, string>): Promise<Item[]> {
    const qs = params ? '?' + new URLSearchParams(params).toString() : '';
    return request(`/items${qs}`);
  },
  getItem(id: string): Promise<Item & { files: ItemFile[] }> {
    return request(`/items/${id}`);
  },
  createItem(body: CreateItemBody): Promise<Item> {
    return request('/items', { method: 'POST', body: JSON.stringify(body) });
  },
  updateItem(id: string, body: UpdateItemBody): Promise<Item> {
    return request(`/items/${id}`, { method: 'PUT', body: JSON.stringify(body) });
  },
  deleteItem(id: string): Promise<void> {
    return request(`/items/${id}`, { method: 'DELETE' });
  },
  restoreItem(id: string): Promise<Item> {
    return request(`/items/${id}/restore`, { method: 'POST' });
  },
  permanentDeleteItem(id: string): Promise<void> {
    return request(`/items/${id}/permanent`, { method: 'DELETE' });
  },
  duplicateItem(id: string): Promise<Item> {
    return request(`/items/${id}/duplicate`, { method: 'POST' });
  },

  bulkUpdateItems(ids: string[], updates: { category?: string; location?: string; status?: string; flagged?: number }): Promise<{ updated: number }> {
    return request('/items/bulk', { method: 'PATCH', body: JSON.stringify({ ids, updates }) });
  },

  // Suggestions
  getCategories(): Promise<string[]> {
    return request('/suggestions/categories');
  },
  getLocations(): Promise<string[]> {
    return request('/suggestions/locations');
  },

  // Files
  async uploadFiles(itemId: string, files: File[], type: 'photo' | 'receipt'): Promise<ItemFile[]> {
    const form = new FormData();
    form.append('type', type);
    for (const f of files) form.append('files', f);
    const res = await fetch(`${BASE}/items/${itemId}/files`, { method: 'POST', body: form });
    if (!res.ok) throw new Error('Upload failed');
    return res.json();
  },
  deleteFile(fileId: string): Promise<void> {
    return request(`/files/${fileId}`, { method: 'DELETE' });
  },
  setFeaturedPhoto(itemId: string, fileId: string): Promise<void> {
    return request(`/items/${itemId}/files/${fileId}/featured`, { method: 'PUT' });
  },

  // Stats
  getStats(): Promise<StatsResponse> {
    return request('/stats');
  },
};

// Image variant URL helpers
function variantUrl(storedName: string, suffix: string): string {
  const dot = storedName.lastIndexOf('.');
  return `/api/uploads/${storedName.slice(0, dot)}${suffix}${storedName.slice(dot)}`;
}

export function thumbUrl(storedName: string): string {
  return variantUrl(storedName, '_thumb');
}

export function largeUrl(storedName: string): string {
  return variantUrl(storedName, '_large');
}

export function uploadUrl(storedName: string): string {
  return `/api/uploads/${storedName}`;
}