import db from '../../config/database';
import { v4 as uuidv4 } from 'uuid';
import { logger } from '../../utils/logger';

export interface StockDistributionAdvice {
  id: string;
  tenantId: string;
  shopId: string;
  sourceWarehouseId: string;
  targetWarehouseId: string;
  skuId: string;
  quantity: number;
  reason: string;
  priority: 'LOW' | 'MEDIUM' | 'HIGH';
  status: 'PENDING' | 'APPROVED' | 'REJECTED' | 'EXECUTED';
  estimatedCost: number;
  expectedBenefit: number;
  traceId: string;
  taskId: string;
  createdAt: Date;
  updatedAt: Date;
}

export class InventoryDistributionService {
  private static readonly TABLE = 'cf_stock_distribution_advice';

  static async generateDistributionAdvice(tenantId: string, shopId: string, traceId: string, taskId: string): Promise<StockDistributionAdvice[]> {
    // 这里应该实现库存分布建议的生成逻辑
    // 暂时返回模拟数据
    return [
      {
        id: uuidv4(),
        tenantId,
        shopId,
        sourceWarehouseId: 'warehouse_1',
        targetWarehouseId: 'warehouse_2',
        skuId: 'sku_1',
        quantity: 100,
        reason: '预测需求增长',
        priority: 'HIGH',
        status: 'PENDING',
        estimatedCost: 500,
        expectedBenefit: 1000,
        traceId,
        taskId,
        createdAt: new Date(),
        updatedAt: new Date()
      }
    ];
  }

  static async getAdvice(tenantId: string): Promise<any[]> {
    // 这里应该实现获取库存分布建议的逻辑
    // 暂时返回模拟数据
    return [
      {
        productId: 'product_1',
        fromWarehouseId: 'warehouse_1',
        toWarehouseId: 'warehouse_2',
        suggestedQuantity: 100,
        reason: '预测需求增长'
      }
    ];
  }

  static async getAdviceById(id: string): Promise<StockDistributionAdvice | null> {
    return await db(this.TABLE).where({ id }).first();
  }

  static async updateAdviceStatus(id: string, status: StockDistributionAdvice['status']): Promise<StockDistributionAdvice | null> {
    await db(this.TABLE)
      .where({ id })
      .update({
        status,
        updatedAt: new Date()
      });
    
    return await this.getAdviceById(id);
  }

  static async listAdvices(tenantId: string, filters?: any): Promise<StockDistributionAdvice[]> {
    let query = db(this.TABLE).where({ tenantId });
    
    if (filters) {
      if (filters.status) query = query.where({ status: filters.status });
      if (filters.priority) query = query.where({ priority: filters.priority });
      if (filters.startDate) query = query.where('createdAt', '>=', filters.startDate);
      if (filters.endDate) query = query.where('createdAt', '<=', filters.endDate);
    }
    
    return await query.orderBy('createdAt', 'desc');
  }
}
