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

/**
 * Orders Tools Service
 * Provides MCP tools for order management.
 *
 * TODO: Connect to actual OrdersService when available.
 */
export class OrdersToolsService implements McpToolProvider {
  getTools(): McpToolDefinition[] {
    return [
      {
        name: 'create_order',
        description: 'Crea un nuevo pedido',
        category: 'orders',
        permissions: ['orders.create'],
        parameters: {
          type: 'object',
          properties: {
            customer_id: { type: 'string', format: 'uuid', description: 'ID del cliente' },
            items: {
              type: 'array',
              description: 'Items del pedido',
              items: {
                type: 'object',
                properties: {
                  product_id: { type: 'string' },
                  quantity: { type: 'number' },
                  unit_price: { type: 'number' },
                },
              },
            },
            payment_method: { type: 'string', enum: ['cash', 'card', 'transfer', 'fiado'] },
            notes: { type: 'string' },
          },
          required: ['customer_id', 'items'],
        },
        returns: { type: 'object' },
      },
      {
        name: 'get_order_status',
        description: 'Consulta el estado de un pedido',
        category: 'orders',
        parameters: {
          type: 'object',
          properties: {
            order_id: { type: 'string', format: 'uuid' },
          },
          required: ['order_id'],
        },
        returns: { type: 'object' },
      },
      {
        name: 'update_order_status',
        description: 'Actualiza el estado de un pedido',
        category: 'orders',
        permissions: ['orders.update'],
        parameters: {
          type: 'object',
          properties: {
            order_id: { type: 'string', format: 'uuid' },
            status: {
              type: 'string',
              enum: ['pending', 'confirmed', 'preparing', 'ready', 'delivered', 'cancelled'],
            },
          },
          required: ['order_id', 'status'],
        },
        returns: { type: 'object' },
      },
    ];
  }

  getHandler(toolName: string): McpToolHandler | undefined {
    const handlers: Record<string, McpToolHandler> = {
      create_order: this.createOrder.bind(this),
      get_order_status: this.getOrderStatus.bind(this),
      update_order_status: this.updateOrderStatus.bind(this),
    };
    return handlers[toolName];
  }

  private async createOrder(
    params: { customer_id: string; items: any[]; payment_method?: string; notes?: string },
    context: McpContext
  ): Promise<any> {
    // TODO: Connect to actual orders service
    const subtotal = params.items.reduce((sum, item) => sum + (item.quantity * (item.unit_price || 0)), 0);
    return {
      order_id: 'order-' + Date.now(),
      customer_id: params.customer_id,
      items: params.items,
      subtotal,
      tax: subtotal * 0.16,
      total: subtotal * 1.16,
      payment_method: params.payment_method || 'cash',
      status: 'pending',
      created_by: context.userId,
      created_at: new Date().toISOString(),
      message: 'Conectar a OrdersService real',
    };
  }

  private async getOrderStatus(
    params: { order_id: string },
    context: McpContext
  ): Promise<any> {
    // TODO: Connect to actual orders service
    return {
      order_id: params.order_id,
      status: 'pending',
      customer_name: 'Cliente ejemplo',
      total: 1160.00,
      items_count: 3,
      created_at: new Date().toISOString(),
      message: 'Conectar a OrdersService real',
    };
  }

  private async updateOrderStatus(
    params: { order_id: string; status: string },
    context: McpContext
  ): Promise<any> {
    // TODO: Connect to actual orders service
    return {
      order_id: params.order_id,
      previous_status: 'pending',
      new_status: params.status,
      updated_by: context.userId,
      updated_at: new Date().toISOString(),
      message: 'Conectar a OrdersService real',
    };
  }
}
