import db from '../config/database';
import { AuditService } from './AuditService';
import { AIService } from './AIService';

/**
 * [BIZ_ECO_04] 基于 AGI 的全球供应链动态重组 (Dynamic Supply Chain Recomposition)
 * 负责实时监控全球风险，自动触发供应链节点的替换与重组（如：当某地区罢工时，自动重组至备选工厂与航线）
 */
export class DynamicRecompositionService {
  /**
   * 触发供应链动态重组分析
   */
  static async triggerRecomposition(
    tenantId: string, 
    category: string, 
    reason: string,
    traceId: string
  ): Promise<void> {
    // 1. 获取当前供应链节点快照
    const currentNodes = await db('cf_autonomous_eco_contracts')
      .where({ tenant_id: tenantId, status: 'SIGNED' })
      .limit(10);

    // 2. AGI 分析重组方案 (模拟)
    const recompositionLogic = await AIService.analyzeSupplyChainRecomposition(tenantId, category, reason);
    
    if (recompositionLogic.needsRecomposition) {
      await db.transaction(async (trx) => {
        // 3. 记录重组提案
        const [id] = await trx('cf_dynamic_recomposition').insert({
          tenant_id: tenantId,
          category,
          current_nodes: JSON.stringify(currentNodes),
          new_nodes: JSON.stringify(recompositionLogic.proposedNodes),
          logic_snapshot: recompositionLogic.reasoning,
          status: 'PROPOSED'
        });

        // 审计记录
        await AuditService.log({
          tenant_id: tenantId,
          action: 'SUPPLY_CHAIN_RECOMPOSITION_PROPOSED',
          target_type: 'SUPPLY_CHAIN',
          target_id: id.toString(),
          trace_id: traceId,
          new_data: JSON.stringify({ reason, proposedNodes: recompositionLogic.proposedNodes }),
          metadata: JSON.stringify({ logic: recompositionLogic.reasoning })
        });
      });
    }
  }

  /**
   * 执行重组方案 (BIZ_ECO_04)
   */
  static async executeRecomposition(recompositionId: number, tenantId: string, traceId: string): Promise<void> {
    const proposal = await db('cf_dynamic_recomposition').where({ id: recompositionId }).first();
    if (!proposal) return;

    await db.transaction(async (trx) => {
      // 模拟执行重组：更新合同状态，激活新供应商
      await trx('cf_dynamic_recomposition').where({ id: recompositionId }).update({
        status: 'COMPLETED',
        updated_at: db.fn.now()
      });

      // 审计记录
      await AuditService.log({
        tenant_id: tenantId,
        action: 'SUPPLY_CHAIN_RECOMPOSITION_EXECUTED',
        target_type: 'SUPPLY_CHAIN',
        target_id: recompositionId.toString(),
        trace_id: traceId,
        new_data: JSON.stringify({ status: 'COMPLETED' }),
        metadata: JSON.stringify({ category: proposal.category })
      });
    });
  }

  /**
   * 获取租户所有重组历史
   */
  static async getRecompositionHistory(tenantId: string) {
    return await db('cf_dynamic_recomposition')
      .where({ tenant_id: tenantId })
      .orderBy('created_at', 'desc');
  }
}
