frontend/services/api.ts

import { ProfitData, Order, FulfillmentProvider, Shop, ShopSummary, AllShopsSummaryResponse, AllShopsOrder, AllShopsProfitData, ShopSummaryResponse } from '../types';

// CONFIGURATION
export const API_BASE_URL = import.meta.env.VITE_API_BASE_URL;

if (!API_BASE_URL) {
  console.error("CRITICAL: VITE_API_BASE_URL is missing. The app cannot connect to the backend.");
}

// ==========================================
// SHOP MANAGEMENT APIs
// ==========================================

export const fetchShops = async (): Promise<Shop[]> => {
  const response = await fetch(`${API_BASE_URL}/api/shops`);
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
};

export const createShop = async (name: string, slug: string, description?: string): Promise<Shop> => {
  const formData = new FormData();
  formData.append('name', name);
  formData.append('slug', slug);
  if (description) formData.append('description', description);

  const response = await fetch(`${API_BASE_URL}/api/shops`, {
    method: 'POST',
    body: formData
  });
  if (!response.ok) {
    const error = await response.json().catch(() => ({ detail: response.statusText }));
    throw new Error(error.detail || 'Failed to create shop');
  }
  return await response.json();
};

export const updateShop = async (
  shopId: number,
  data: { name?: string; description?: string; is_active?: boolean }
): Promise<void> => {
  const formData = new FormData();
  if (data.name) formData.append('name', data.name);
  if (data.description !== undefined) formData.append('description', data.description);
  if (data.is_active !== undefined) formData.append('is_active', data.is_active.toString());

  const response = await fetch(`${API_BASE_URL}/api/shops/${shopId}`, {
    method: 'PUT',
    body: formData
  });
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
};

export const deleteShop = async (shopId: number): Promise<void> => {
  const response = await fetch(`${API_BASE_URL}/api/shops/${shopId}`, {
    method: 'DELETE'
  });
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
};

export const resetShopData = async (shopId: number): Promise<void> => {
  const response = await fetch(`${API_BASE_URL}/api/shops/${shopId}/reset`, {
    method: 'POST'
  });
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
};

// ==========================================
// SHOP-SCOPED DATA APIs
// ==========================================

export const fetchShopSummary = async (shopId: number, startDate?: string, endDate?: string): Promise<ShopSummaryResponse> => {
  let url = `${API_BASE_URL}/api/shops/${shopId}/analytics/summary`;
  const params = new URLSearchParams();
  if (startDate) params.append('start_date', startDate);
  if (endDate) params.append('end_date', endDate);
  if (params.toString()) url += `?${params.toString()}`;

  const response = await fetch(url);
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}

export const fetchProfitData = async (shopId: number): Promise<ProfitData[]> => {
  const response = await fetch(`${API_BASE_URL}/api/shops/${shopId}/analytics/net-profit`);
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
};

export const fetchOrders = async (shopId: number): Promise<Order[]> => {
  const response = await fetch(`${API_BASE_URL}/api/shops/${shopId}/orders`);
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}

export const uploadFile = async (shopId: number, type: 'etsy' | 'fulfillment', file: File, providerId?: number) => {
  const formData = new FormData();
  formData.append('file', file);
  if (providerId) {
    formData.append('provider_id', providerId.toString());
  }

  const endpoint = type === 'etsy'
    ? `/api/shops/${shopId}/upload/etsy`
    : `/api/shops/${shopId}/upload/fulfillment`;

  const response = await fetch(`${API_BASE_URL}${endpoint}`, {
    method: 'POST',
    body: formData,
  });

  if (!response.ok) {
    throw new Error(`Upload failed: ${response.statusText}`);
  }
  return await response.json();
};

export const createProvider = async (shopId: number, name: string, mapping: any) => {
  const formData = new FormData();
  formData.append('name', name);
  formData.append('mapping_config', JSON.stringify(mapping));

  const response = await fetch(`${API_BASE_URL}/api/shops/${shopId}/providers`, {
    method: 'POST',
    body: formData
  });
  if (!response.ok) throw new Error('Failed to create provider');
  return await response.json();
}

export const fetchProviders = async (shopId: number): Promise<FulfillmentProvider[]> => {
  const response = await fetch(`${API_BASE_URL}/api/shops/${shopId}/providers`);
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}

export const fetchImportHistory = async (shopId: number, type: string, providerId?: number): Promise<any[]> => {
  let url = `${API_BASE_URL}/api/shops/${shopId}/imports?import_type=${type}`;
  if (providerId) {
    url += `&provider_id=${providerId}`;
  }
  const response = await fetch(url);
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}

export const fetchImportDetails = async (shopId: number, id: number): Promise<{ id: number, file_name: string, raw_content: string }> => {
  const response = await fetch(`${API_BASE_URL}/api/shops/${shopId}/imports/${id}`);
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}

export const deleteImport = async (shopId: number, id: number) => {
  const response = await fetch(`${API_BASE_URL}/api/shops/${shopId}/imports/${id}`, {
    method: 'DELETE'
  });
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}

export const runMatching = async (shopId: number) => {
  const response = await fetch(`${API_BASE_URL}/api/shops/${shopId}/actions/run-matching`, {
    method: 'POST'
  });
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}

// ==========================================
// CROSS-SHOP ANALYTICS APIs
// ==========================================

export const fetchAllShopsSummary = async (startDate?: string, endDate?: string): Promise<AllShopsSummaryResponse> => {
  let url = `${API_BASE_URL}/api/analytics/all-shops/summary`;
  const params = new URLSearchParams();
  if (startDate) params.append('start_date', startDate);
  if (endDate) params.append('end_date', endDate);
  if (params.toString()) url += `?${params.toString()}`;

  const response = await fetch(url);
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}

export const fetchAllShopsOrders = async (): Promise<AllShopsOrder[]> => {
  const response = await fetch(`${API_BASE_URL}/api/analytics/all-shops/orders`);
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}

export const fetchAllShopsProfitData = async (): Promise<AllShopsProfitData[]> => {
  const response = await fetch(`${API_BASE_URL}/api/analytics/all-shops/profit`);
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}

// ==========================================
// LEGACY/ADMIN APIs
// ==========================================

export const resetDatabase = async () => {
  const response = await fetch(`${API_BASE_URL}/api/admin/reset-database`, {
    method: 'POST'
  });
  if (!response.ok) throw new Error(`Backend error: ${response.statusText}`);
  return await response.json();
}