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

/**
 * [BIZ_SOV_06] 跨主权贸易纠纷自动调解协议 (Sovereign Mediation)
 * 负责在仲裁前，利用自治中立节点进行纠纷调解，自动生成多方可接受的调解方案
 */
export class SovereignMediationService {
  /**
   * 发起调解请求
   */
  static async startMediation(
    tenantId: string, 
    disputeId: string, 
    traceId: string
  ): Promise<void> {
    // 1. 获取纠纷详情与存证证据 (模拟)
    const dispute = await db('cf_arbitration_records').where({ dispute_id: disputeId }).first();
    if (!dispute) throw new Error('Dispute not found in arbitration records');

    // 2. AGI 中立节点生成调解方案 (模拟)
    const mediationLogic = await AIService.generateMediationResolution(disputeId, dispute.evidence_hash);
    const agreementHash = 'AGREE-' + Math.random().toString(36).substring(7).toUpperCase();

    await db.transaction(async (trx) => {
      // 3. 记录调解过程
      const [id] = await trx('cf_sov_mediation').insert({
        tenant_id: tenantId,
        dispute_id: disputeId,
        mediator_node_id: 'NODE-AGI-MEDIATOR-01',
        proposed_resolution: mediationLogic.description,
        status: 'MEDIATING',
        agreement_hash: agreementHash
      });

      // 4. 审计记录
      await AuditService.log({
        tenant_id: tenantId,
        action: 'SOVEREIGN_MEDIATION_STARTED',
        target_type: 'TRADE_DISPUTE',
        target_id: disputeId,
        trace_id: traceId,
        new_data: JSON.stringify({ proposedResolution: mediationLogic.description }),
        metadata: JSON.stringify({ agreementHash })
      });
    });
  }

  /**
   * 签署调解协议 (BIZ_SOV_06)
   */
  static async signMediationAgreement(tenantId: string, disputeId: string, traceId: string): Promise<void> {
    await db('cf_sov_mediation')
      .where({ tenant_id: tenantId, dispute_id: disputeId })
      .update({
        status: 'RESOLVED',
        updated_at: db.fn.now()
      });

    await AuditService.log({
      tenant_id: tenantId,
      action: 'SOVEREIGN_MEDIATION_RESOLVED',
      target_type: 'TRADE_DISPUTE',
      target_id: disputeId,
      trace_id: traceId,
      new_data: JSON.stringify({ status: 'RESOLVED' }),
      metadata: JSON.stringify({ timestamp: new Date().toISOString() })
    });
  }

  /**
   * 获取租户所有调解记录
   */
  static async getMediationHistory(tenantId: string) {
    return await db('cf_sov_mediation')
      .where({ tenant_id: tenantId })
      .orderBy('created_at', 'desc');
  }
}
