import db from '../../config/database';
import { logger } from '../../utils/logger';
import { AIService } from '../../services/AIService';
import { FeatureGovernanceService } from '../../core/governance/FeatureGovernanceService';

/**
 * [BIZ_TRADE_25] 多仓智能履约编排 (GlobalFulfillmentService)
 * @description 在全球主权贸易生态中，基于订单、库存、成本、时效及碳足迹，动态编排最优履约路径。
 */
export class GlobalFulfillmentService {
  private static readonly TABLE_NAME = 'cf_global_fulfillment';

  /**
   * 初始化数据库表
   */
  static async initTable() {
    const hasTable = await db.schema.hasTable(this.TABLE_NAME);
    if (!hasTable) {
      logger.info(`📦 Creating ${this.TABLE_NAME} table...`);
      await db.schema.createTable(this.TABLE_NAME, (table) => {
        table.increments('id').primary();
        table.string('order_id', 64).notNullable();
        table.string('tenant_id', 64).notNullable();
        table.string('warehouse_id', 64).notNullable(); // 选择的仓库 ID
        table.string('shipping_method', 64).notNullable(); // 运输方式 (SEA, AIR, RAIL, MULTIMODAL)
        table.decimal('estimated_cost', 10, 2); // 预估成本
        table.decimal('carbon_footprint', 10, 4); // 碳足迹 (吨 CO2e)
        table.string('status', 32).defaultTo('PENDING'); // PENDING, PROCESSING, SHIPPED, DELIVERED
        table.json('routing_details'); // 详细路径与多式联运信息
        table.string('trace_id', 128);
        table.timestamps(true, true);
        table.index(['order_id', 'status']);
      });
      logger.info(`✅ Table ${this.TABLE_NAME} created`);
    }
  }

  /**
   * 编排最优履约路径
   * @param tenantId 租户 ID
   * @param orderData 订单数据 (含目的地、重量、体积、时效要求)
   * @param traceId 调用链 ID
   */
  static async orchestrateFulfillment(
    tenantId: string,
    orderData: any,
    traceId: string
  ): Promise<any> {
    // 1. 功能开关检查
    if (!(await FeatureGovernanceService.isEnabled('BIZ_TRADE_GLOBAL_FULFILLMENT', tenantId))) {
      logger.warn(`[GlobalFulfillment] Service disabled for tenant ${tenantId} | traceId: ${traceId}`);
      return null;
    }

    logger.info(`[GlobalFulfillment] Orchestrating fulfillment for Order ${orderData.orderId} | traceId: ${traceId}`);

    // 2. 获取全球可用仓库库存 (模拟)
    const availableWarehouses = await this.getAvailableInventory(orderData.productId);
    if (availableWarehouses.length === 0) {
      logger.error(`[GlobalFulfillment] No inventory available for Product ${orderData.productId}`);
      return null;
    }

    // 3. 调用 AGI 驱动的“履约编排引擎”
    // 基于成本、时效、碳足迹进行多目标优化
    const prompt = `Orchestrate best fulfillment for Order ${orderData.orderId}. Destination: ${orderData.destination}. 
      Available Warehouses: ${JSON.stringify(availableWarehouses)}. 
      Requirement: Balanced cost, speed, and carbon footprint.`;
    
    const strategyResponse = await AIService.generateStrategy(prompt, traceId);
    
    // 4. 解析 AGI 决策结果 (模拟解析逻辑)
    // 假设 AGI 返回：WAREHOUSE:WH_US_01,METHOD:MULTIMODAL,COST:45.00,CARBON:0.012
    const selectedWH = strategyResponse.includes('WAREHOUSE:') ? strategyResponse.split('WAREHOUSE:')[1].split(',')[0] : availableWarehouses[0].id;
    const method = strategyResponse.includes('METHOD:') ? strategyResponse.split('METHOD:')[1].split(',')[0] : 'MULTIMODAL';
    const cost = strategyResponse.includes('COST:') ? parseFloat(strategyResponse.split('COST:')[1].split(',')[0]) : 50.00;
    const carbon = strategyResponse.includes('CARBON:') ? parseFloat(strategyResponse.split('CARBON:')[1].split(',')[0]) : 0.015;

    // 5. 持久化履约计划
    const plan = {
      order_id: orderData.orderId,
      tenant_id: tenantId,
      warehouse_id: selectedWH,
      shipping_method: method,
      estimated_cost: cost,
      carbon_footprint: carbon,
      status: 'PENDING',
      routing_details: JSON.stringify({
        hops: ['Warehouse', 'Local Hub', 'International Port', 'Destination Hub', 'Customer'],
        multimodal: method === 'MULTIMODAL',
        carbon_logic: 'AGI Optimized Path'
      }),
      trace_id: traceId,
      created_at: new Date(),
      updated_at: new Date()
    };

    await db(this.TABLE_NAME).insert(plan);

    logger.info(`[GlobalFulfillment] Fulfillment plan created: ${selectedWH} via ${method} | Cost: ${cost} | Carbon: ${carbon} | traceId: ${traceId}`);
    
    return plan;
  }

  /**
   * 模拟获取可用库存
   */
  private static async getAvailableInventory(productId: string) {
    return [
      { id: 'WH_CN_01', region: 'CN', stock: 100 },
      { id: 'WH_US_01', region: 'US', stock: 50 },
      { id: 'WH_EU_01', region: 'EU', stock: 30 }
    ];
  }
}
