import {
  McpToolProvider,
  McpToolDefinition,
  McpToolHandler,
  McpContext,
} from '../interfaces';

/**
 * Products Tools Service
 * Provides MCP tools for product management.
 *
 * TODO: Connect to actual ProductsService when available.
 */
export class ProductsToolsService implements McpToolProvider {
  getTools(): McpToolDefinition[] {
    return [
      {
        name: 'list_products',
        description: 'Lista productos filtrados por categoria, nombre o precio',
        category: 'products',
        parameters: {
          type: 'object',
          properties: {
            category: { type: 'string', description: 'Filtrar por categoria' },
            search: { type: 'string', description: 'Buscar por nombre' },
            min_price: { type: 'number', description: 'Precio minimo' },
            max_price: { type: 'number', description: 'Precio maximo' },
            limit: { type: 'number', description: 'Limite de resultados', default: 20 },
          },
        },
        returns: {
          type: 'array',
          items: { type: 'object' },
        },
      },
      {
        name: 'get_product_details',
        description: 'Obtiene detalles completos de un producto',
        category: 'products',
        parameters: {
          type: 'object',
          properties: {
            product_id: { type: 'string', format: 'uuid', description: 'ID del producto' },
          },
          required: ['product_id'],
        },
        returns: { type: 'object' },
      },
      {
        name: 'check_product_availability',
        description: 'Verifica si hay stock suficiente de un producto',
        category: 'products',
        parameters: {
          type: 'object',
          properties: {
            product_id: { type: 'string', format: 'uuid', description: 'ID del producto' },
            quantity: { type: 'number', minimum: 1, description: 'Cantidad requerida' },
          },
          required: ['product_id', 'quantity'],
        },
        returns: {
          type: 'object',
          properties: {
            available: { type: 'boolean' },
            current_stock: { type: 'number' },
          },
        },
      },
    ];
  }

  getHandler(toolName: string): McpToolHandler | undefined {
    const handlers: Record<string, McpToolHandler> = {
      list_products: this.listProducts.bind(this),
      get_product_details: this.getProductDetails.bind(this),
      check_product_availability: this.checkProductAvailability.bind(this),
    };
    return handlers[toolName];
  }

  private async listProducts(
    params: { category?: string; search?: string; min_price?: number; max_price?: number; limit?: number },
    context: McpContext
  ): Promise<any[]> {
    // TODO: Connect to actual products service
    return [
      {
        id: 'sample-product-1',
        name: 'Producto de ejemplo 1',
        price: 99.99,
        stock: 50,
        category: params.category || 'general',
        message: 'Conectar a ProductsService real',
      },
    ];
  }

  private async getProductDetails(
    params: { product_id: string },
    context: McpContext
  ): Promise<any> {
    // TODO: Connect to actual products service
    return {
      id: params.product_id,
      name: 'Producto de ejemplo',
      description: 'Descripcion del producto',
      sku: 'SKU-001',
      price: 99.99,
      stock: 50,
      message: 'Conectar a ProductsService real',
    };
  }

  private async checkProductAvailability(
    params: { product_id: string; quantity: number },
    context: McpContext
  ): Promise<any> {
    // TODO: Connect to actual inventory service
    const mockStock = 50;
    return {
      available: mockStock >= params.quantity,
      current_stock: mockStock,
      requested_quantity: params.quantity,
      shortage: Math.max(0, params.quantity - mockStock),
      message: 'Conectar a InventoryService real',
    };
  }
}
