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

/**
 * [BIZ_FIN_19] 租户级税务优惠政策自动发现与在线申请
 * 负责在全球范围内扫描适用于租户的税务减免、补贴或优惠政策，并自动化生成/提交申请
 */
export class TaxBonusService {
  /**
   * 扫描并发现可申请的税务优惠
   */
  static async discoverAndApply(tenantId: string, traceId: string): Promise<void> {
    // 1. 获取租户业务背景 (模拟从 cf_tenant 获取国家、类目、规模等)
    const tenantContext = {
      country: 'US',
      category: 'Electronics',
      annualRevenue: 500000
    };

    // 2. 调用 AI 发现匹配政策 (模拟调用 AIService 分析全球政策库)
    const matchingPolicies = await AIService.findTaxBonuses(tenantContext);

    for (const policy of matchingPolicies) {
      // 检查是否已存在申请记录
      const existing = await db('cf_tax_bonus_applications')
        .where({ tenant_id: tenantId, policy_id: policy.id })
        .first();

      if (!existing) {
        await db.transaction(async (trx) => {
          // 3. 创建申请记录
          const [id] = await trx('cf_tax_bonus_applications').insert({
            tenant_id: tenantId,
            policy_id: policy.id,
            policy_name: policy.name,
            status: 'PENDING',
            estimated_bonus: policy.estimatedAmount,
            application_data: JSON.stringify({ 
              requiredDocuments: policy.docs,
              deadline: policy.deadline
            })
          });

          // 4. 模拟自动化提交申请 (如果是 API 驱动的政府平台)
          if (policy.supportsAutoSubmission) {
            await this.submitApplication(id, tenantId, traceId);
          }

          // 审计记录
          await AuditService.log({
            tenant_id: tenantId,
            action: 'TAX_BONUS_DISCOVERED',
            target_type: 'TAX_BONUS',
            target_id: id.toString(),
            trace_id: traceId,
            new_data: JSON.stringify({ policyName: policy.name, amount: policy.estimatedAmount }),
            metadata: JSON.stringify({ autoSubmit: policy.supportsAutoSubmission })
          });
        });
      }
    }
  }

  /**
   * 提交申请逻辑
   */
  static async submitApplication(applicationId: number, tenantId: string, traceId: string): Promise<void> {
    // 模拟向第三方或政府 API 提交
    await db('cf_tax_bonus_applications')
      .where({ id: applicationId })
      .update({
        status: 'SUBMITTED',
        updated_at: db.fn.now()
      });

    await AuditService.log({
      tenant_id: tenantId,
      action: 'TAX_BONUS_SUBMITTED',
      target_type: 'TAX_BONUS',
      target_id: applicationId.toString(),
      trace_id: traceId,
      new_data: JSON.stringify({ status: 'SUBMITTED' }),
      metadata: JSON.stringify({ timestamp: new Date().toISOString() })
    });
  }

  /**
   * 获取租户所有税务优惠申请状态
   */
  static async getApplications(tenantId: string) {
    return await db('cf_tax_bonus_applications')
      .where({ tenant_id: tenantId })
      .orderBy('created_at', 'desc');
  }
}
