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

/**
 * Inventory Tools Service
 * Provides MCP tools for inventory management.
 *
 * TODO: Connect to actual InventoryService when available.
 */
export class InventoryToolsService implements McpToolProvider {
  getTools(): McpToolDefinition[] {
    return [
      {
        name: 'check_stock',
        description: 'Consulta el stock actual de productos',
        category: 'inventory',
        parameters: {
          type: 'object',
          properties: {
            product_ids: { type: 'array', description: 'IDs de productos a consultar' },
            warehouse_id: { type: 'string', description: 'ID del almacen' },
          },
        },
        returns: { type: 'array' },
      },
      {
        name: 'get_low_stock_products',
        description: 'Lista productos que estan por debajo del minimo de stock',
        category: 'inventory',
        parameters: {
          type: 'object',
          properties: {
            threshold: { type: 'number', description: 'Umbral de stock bajo' },
          },
        },
        returns: { type: 'array' },
      },
      {
        name: 'record_inventory_movement',
        description: 'Registra un movimiento de inventario (entrada, salida, ajuste)',
        category: 'inventory',
        permissions: ['inventory.write'],
        parameters: {
          type: 'object',
          properties: {
            product_id: { type: 'string', format: 'uuid' },
            quantity: { type: 'number' },
            movement_type: { type: 'string', enum: ['in', 'out', 'adjustment'] },
            reason: { type: 'string' },
          },
          required: ['product_id', 'quantity', 'movement_type'],
        },
        returns: { type: 'object' },
      },
      {
        name: 'get_inventory_value',
        description: 'Calcula el valor total del inventario',
        category: 'inventory',
        parameters: {
          type: 'object',
          properties: {
            warehouse_id: { type: 'string', description: 'ID del almacen (opcional)' },
          },
        },
        returns: {
          type: 'object',
          properties: {
            total_value: { type: 'number' },
            items_count: { type: 'number' },
          },
        },
      },
    ];
  }

  getHandler(toolName: string): McpToolHandler | undefined {
    const handlers: Record<string, McpToolHandler> = {
      check_stock: this.checkStock.bind(this),
      get_low_stock_products: this.getLowStockProducts.bind(this),
      record_inventory_movement: this.recordInventoryMovement.bind(this),
      get_inventory_value: this.getInventoryValue.bind(this),
    };
    return handlers[toolName];
  }

  private async checkStock(
    params: { product_ids?: string[]; warehouse_id?: string },
    context: McpContext
  ): Promise<any[]> {
    // TODO: Connect to actual inventory service
    return [
      {
        product_id: 'sample-1',
        product_name: 'Producto ejemplo',
        stock: 100,
        warehouse_id: params.warehouse_id || 'default',
        message: 'Conectar a InventoryService real',
      },
    ];
  }

  private async getLowStockProducts(
    params: { threshold?: number },
    context: McpContext
  ): Promise<any[]> {
    // TODO: Connect to actual inventory service
    const threshold = params.threshold || 10;
    return [
      {
        product_id: 'low-stock-1',
        product_name: 'Producto bajo stock',
        current_stock: 5,
        min_stock: threshold,
        shortage: threshold - 5,
        message: 'Conectar a InventoryService real',
      },
    ];
  }

  private async recordInventoryMovement(
    params: { product_id: string; quantity: number; movement_type: string; reason?: string },
    context: McpContext
  ): Promise<any> {
    // TODO: Connect to actual inventory service
    return {
      movement_id: 'mov-' + Date.now(),
      product_id: params.product_id,
      quantity: params.quantity,
      movement_type: params.movement_type,
      reason: params.reason,
      recorded_by: context.userId,
      recorded_at: new Date().toISOString(),
      message: 'Conectar a InventoryService real',
    };
  }

  private async getInventoryValue(
    params: { warehouse_id?: string },
    context: McpContext
  ): Promise<any> {
    // TODO: Connect to actual inventory service
    return {
      total_value: 150000.00,
      items_count: 500,
      warehouse_id: params.warehouse_id || 'all',
      currency: 'MXN',
      message: 'Conectar a InventoryService real',
    };
  }
}
