/**
 * [MOCK-SUPPLIERS] Suppliers模块DataSource
 */

export interface Supplier {
  id: string;
  name: string;
  contact: string;
  email: string;
  phone: string;
  address: string;
  category: string;
  rating: number;
  status: 'active' | 'inactive' | 'pending';
  paymentTerms: string;
  leadTime: number;
  minOrderQty: number;
  createdAt: string;
}

export interface SupplierProduct {
  id: string;
  supplierId: string;
  sku: string;
  productName: string;
  costPrice: number;
  moq: number;
  leadTime: number;
  quality: 'A' | 'B' | 'C';
}

export interface ISuppliersDataSource {
  fetchSuppliers(): Promise<Supplier[]>;
  fetchSupplierDetail(id: string): Promise<Supplier>;
  saveSupplier(data: Partial<Supplier>): Promise<Supplier>;
  deleteSupplier(id: string): Promise<void>;
  fetchSupplierProducts(supplierId: string): Promise<SupplierProduct[]>;
}

class MockSuppliersDataSource implements ISuppliersDataSource {
  async fetchSuppliers(): Promise<Supplier[]> {
    return [
      { id: 'sup_001', name: 'Shenzhen Tech Co.', contact: 'Li Wei', email: 'liwei@szttech.com', phone: '+86-138-0000-0001', address: 'Shenzhen, China', category: 'Electronics', rating: 4.8, status: 'active', paymentTerms: '30% deposit, 70% before shipping', leadTime: 15, minOrderQty: 100, createdAt: '2025-01-15' },
      { id: 'sup_002', name: 'Guangzhou Accessories Ltd.', contact: 'Wang Ming', email: 'wangming@gzacc.com', phone: '+86-138-0000-0002', address: 'Guangzhou, China', category: 'Accessories', rating: 4.5, status: 'active', paymentTerms: 'Net 30', leadTime: 10, minOrderQty: 50, createdAt: '2025-02-20' },
      { id: 'sup_003', name: 'Dongguan Manufacturing', contact: 'Zhang Hua', email: 'zhanghua@dgmfg.com', phone: '+86-138-0000-0003', address: 'Dongguan, China', category: 'Electronics', rating: 4.2, status: 'active', paymentTerms: '50% deposit, 50% on delivery', leadTime: 20, minOrderQty: 200, createdAt: '2025-03-10' },
    ];
  }

  async fetchSupplierDetail(id: string): Promise<Supplier> {
    const suppliers = await this.fetchSuppliers();
    return suppliers.find(s => s.id === id) || suppliers[0];
  }

  async saveSupplier(data: Partial<Supplier>): Promise<Supplier> {
    return { ...data, id: data.id || `sup_${Date.now()}`, createdAt: new Date().toISOString() } as Supplier;
  }

  async deleteSupplier(id: string): Promise<void> {}

  async fetchSupplierProducts(supplierId: string): Promise<SupplierProduct[]> {
    return [
      { id: 'sp_001', supplierId, sku: 'SKU-001', productName: 'Wireless Headphones', costPrice: 12.50, moq: 100, leadTime: 15, quality: 'A' },
      { id: 'sp_002', supplierId, sku: 'SKU-002', productName: 'USB-C Cable', costPrice: 1.80, moq: 500, leadTime: 10, quality: 'A' },
      { id: 'sp_003', supplierId, sku: 'SKU-003', productName: 'Phone Case', costPrice: 2.50, moq: 200, leadTime: 12, quality: 'B' },
    ];
  }
}

class ApiSuppliersDataSource implements ISuppliersDataSource {
  private baseUrl = '/api/suppliers';

  async fetchSuppliers(): Promise<Supplier[]> {
    const res = await fetch(this.baseUrl);
    return res.json();
  }

  async fetchSupplierDetail(id: string): Promise<Supplier> {
    const res = await fetch(`${this.baseUrl}/${id}`);
    return res.json();
  }

  async saveSupplier(data: Partial<Supplier>): Promise<Supplier> {
    const res = await fetch(this.baseUrl, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(data) });
    return res.json();
  }

  async deleteSupplier(id: string): Promise<void> {
    await fetch(`${this.baseUrl}/${id}`, { method: 'DELETE' });
  }

  async fetchSupplierProducts(supplierId: string): Promise<SupplierProduct[]> {
    const res = await fetch(`${this.baseUrl}/${supplierId}/products`);
    return res.json();
  }
}

const useMock = process.env.REACT_APP_USE_MOCK === 'true';
export const suppliersDataSource: ISuppliersDataSource = useMock ? new MockSuppliersDataSource() : new ApiSuppliersDataSource();