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

/**
 * [BIZ_TRADE_21] AGI 驱动的碳中和路径自优化 (CarbonNeutralPathService)
 * @description 在全球主权贸易生态中，通过 AGI 实时监控全球各主权国家的碳足迹与碳税动态，动态优化 SKU 运输路径、包装材料与能源选择，实现最低碳排放与最优成本的平衡。
 */
export class CarbonNeutralPathService {
  private static readonly CARBON_TABLE = 'cf_carbon_neutral_path';

  /**
   * 初始化数据库表
   */
  static async initTable() {
    const hasTable = await db.schema.hasTable(this.CARBON_TABLE);
    if (!hasTable) {
      logger.info(`📦 Creating ${this.CARBON_TABLE} table...`);
      await db.schema.createTable(this.CARBON_TABLE, (table) => {
        table.increments('id').primary();
        table.string('tenant_id', 64).notNullable();
        table.string('order_id', 64).notNullable();
        table.string('origin_country', 16).notNullable();
        table.string('dest_country', 16).notNullable();
        table.decimal('estimated_carbon_emission', 10, 4); // 预估碳排放 (吨)
        table.decimal('carbon_offset_cost', 10, 2); // 碳中和成本
        table.string('optimized_path', 255); // 优化后的路径描述 (e.g., 'SEA-RAIL-TRUCK')
        table.json('path_logic'); // { route, packing_type, energy_source }
        table.string('status', 32).defaultTo('CALCULATED'); // CALCULATED, OPTIMIZED, EXECUTED
        table.string('trace_id', 128);
        table.timestamps(true, true);
        table.index(['tenant_id', 'order_id']);
      });
      logger.info(`✅ Table ${this.CARBON_TABLE} created`);
    }
  }

  /**
   * 优化订单碳中和路径
   * @param tenantId 租户 ID
   * @param orderId 订单 ID
   * @param originCountry 起始国家
   * @param destCountry 目标国家
   * @param traceId 调用链 ID
   */
  static async optimizeCarbonPath(
    tenantId: string,
    orderId: string,
    originCountry: string,
    destCountry: string,
    traceId: string
  ): Promise<any> {
    // 1. 功能开关检查
    if (!(await FeatureGovernanceService.isEnabled('BIZ_TRADE_CARBON_NEUTRAL_PATH', tenantId))) {
      logger.warn(`[CarbonNeutralPath] Service disabled for tenant ${tenantId} | traceId: ${traceId}`);
      return null;
    }

    logger.info(`[CarbonNeutralPath] Optimizing carbon-neutral path for tenant ${tenantId} | order: ${orderId} | traceId: ${traceId}`);

    // 2. 获取当前路径下的碳排放基线 (模拟计算)
    const baselineEmission = 0.5432; // 0.54 吨 CO2
    const baselineCost = 150.00; // 150.00 币种单位

    // 3. 调用 AGI 驱动的“碳中和优化引擎”
    // 基于 AGI 实时数据（如欧盟碳关税 CBAM、可再生能源价格、多式联运时效）生成最优路径
    const prompt = `Optimize carbon-neutral path for order ${orderId} from ${originCountry} to ${destCountry}. Baseline emission: ${baselineEmission} tons. Baseline cost: ${baselineCost}`;
    const optimizationResponse = await AIService.generateStrategy(prompt, traceId);

    // 4. 解析 AGI 决策结果 (模拟解析逻辑)
    // 假设 AGI 返回：PATH:SEA-RAIL,EMISSION:0.32,OFFSET_COST:45.00
    const optimizedPath = optimizationResponse.includes('PATH:') ? optimizationResponse.split('PATH:')[1].split(',')[0] : 'SEA-RAIL';
    const estimatedEmission = optimizationResponse.includes('EMISSION:') ? parseFloat(optimizationResponse.split('EMISSION:')[1].split(',')[0]) : 0.3125;
    const carbonOffsetCost = optimizationResponse.includes('OFFSET_COST:') ? parseFloat(optimizationResponse.split('OFFSET_COST:')[1].split(',')[0]) : 42.50;

    // 5. 持久化碳中和优化记录
    const pathRecord = {
      tenant_id: tenantId,
      order_id: orderId,
      origin_country: originCountry,
      dest_country: destCountry,
      estimated_carbon_emission: estimatedEmission,
      carbon_offset_cost: carbonOffsetCost,
      optimized_path: optimizedPath,
      path_logic: JSON.stringify({
        route: optimizedPath,
        packing_type: 'BIODEGRADABLE',
        energy_source: 'SOLAR_SEA_VESSEL'
      }),
      status: 'OPTIMIZED',
      trace_id: traceId,
      created_at: new Date(),
      updated_at: new Date()
    };

    await db(this.CARBON_TABLE).insert(pathRecord);

    logger.info(`[CarbonNeutralPath] Carbon path optimized successfully for tenant ${tenantId} | order: ${orderId} | path: ${optimizedPath} | traceId: ${traceId}`);
    
    // 6. 联动物流履约系统 (模拟更新物流方案)
    // TODO: 调用 LogisticsIntelligenceService 更新路由方案

    return pathRecord;
  }

  /**
   * 获取租户级碳足迹概览
   */
  static async getTenantCarbonOverview(tenantId: string) {
    const records = await db(this.CARBON_TABLE).where({ tenant_id: tenantId });
    const totalEmission = records.reduce((sum, r) => sum + parseFloat(r.estimated_carbon_emission), 0);
    const totalOffsetCost = records.reduce((sum, r) => sum + parseFloat(r.carbon_offset_cost), 0);
    
    return {
      tenantId,
      totalEmission,
      totalOffsetCost,
      recordCount: records.length
    };
  }
}
