package certification

import (
	"context"
	"fmt"
	"strings"
	"time"

	"hyapi-server/internal/application/certification/dto/commands"
	"hyapi-server/internal/application/certification/dto/responses"
	"hyapi-server/internal/domains/certification/entities"
	"hyapi-server/internal/domains/certification/enums"
	"hyapi-server/internal/domains/certification/ports"
	user_entities "hyapi-server/internal/domains/user/entities"

	"go.uber.org/zap"
)

// ListSignPlatforms 可选签署平台列表
func (s *CertificationApplicationServiceImpl) ListSignPlatforms(ctx context.Context) (*responses.SignPlatformsResponse, error) {
	_ = ctx
	items := make([]*responses.SignPlatformItem, 0, 2)
	for _, p := range s.platformRegistry.List() {
		platform := p.Platform()
		item := &responses.SignPlatformItem{
			Platform:    string(platform),
			Name:        enums.GetSignPlatformName(platform),
			Available:   true,
			Description: "",
		}
		switch platform {
		case enums.SignPlatformEsign:
			item.Description = "通过 e签宝 完成企业实名认证与合同签署"
		case enums.SignPlatformFadada:
			item.Description = "通过法大大完成企业实名认证与合同签署"
		}
		items = append(items, item)
	}
	return &responses.SignPlatformsResponse{Platforms: items}, nil
}

// SelectSignPlatform 用户选择签署平台并生成企业认证链接
func (s *CertificationApplicationServiceImpl) SelectSignPlatform(
	ctx context.Context,
	cmd *commands.SelectSignPlatformCommand,
) (*responses.CertificationResponse, error) {
	if cmd == nil || cmd.UserID == "" {
		return nil, fmt.Errorf("用户ID不能为空")
	}
	platform := enums.SignPlatform(strings.TrimSpace(cmd.SignPlatform))
	if !enums.IsValidSignPlatform(platform) {
		return nil, fmt.Errorf("无效的签署平台: %s", cmd.SignPlatform)
	}

	cert, err := s.aggregateService.LoadCertificationByUserID(ctx, cmd.UserID)
	if err != nil {
		return nil, fmt.Errorf("加载认证信息失败: %w", err)
	}

	record, err := s.enterpriseInfoSubmitRecordRepo.FindLatestByUserID(ctx, cmd.UserID)
	if err != nil || record == nil {
		return nil, fmt.Errorf("未找到企业信息提交记录")
	}
	if record.ManualReviewStatus != "approved" {
		return nil, fmt.Errorf("请先等待管理员审核通过后再选择签署平台")
	}

	// 已选择且已有认证链接：幂等返回
	if cert.SignPlatform == platform && cert.Status == enums.StatusInfoSubmitted && cert.AuthURL != "" {
		resp := s.convertToResponse(cert)
		meta, _ := s.AddStatusMetadata(ctx, cert)
		resp.Metadata = meta
		return resp, nil
	}
	if cert.SignPlatform != "" && cert.SignPlatform != platform {
		return nil, fmt.Errorf("签署平台已选择为 %s，不可更改", enums.GetSignPlatformName(cert.SignPlatform))
	}
	if cert.Status != enums.StatusInfoPendingReview && !(cert.Status == enums.StatusInfoSubmitted && cert.AuthURL == "") {
		return nil, fmt.Errorf("当前状态不允许选择签署平台: %s", enums.GetStatusName(cert.Status))
	}

	if err := cert.SetSignPlatform(platform); err != nil {
		return nil, err
	}

	provider, err := s.platformRegistry.Get(platform)
	if err != nil {
		return nil, err
	}

	authReq := &ports.EnterpriseAuthRequest{
		ClientCorpID:      record.UnifiedSocialCode,
		ClientUserID:      record.LegalPersonID,
		CompanyName:       record.CompanyName,
		UnifiedSocialCode: record.UnifiedSocialCode,
		LegalPersonName:   record.LegalPersonName,
		LegalPersonID:     record.LegalPersonID,
		TransactorName:    record.LegalPersonName,
		TransactorMobile:  record.LegalPersonPhone,
		TransactorID:      record.LegalPersonID,
	}

	authRes, alreadyVerified, err := s.generateEnterpriseAuthOrDetectVerifiedWithProvider(ctx, provider, authReq)
	if err != nil {
		return nil, fmt.Errorf("生成企业认证链接失败: %w", err)
	}

	if alreadyVerified {
		// 已授权/已实名：跳过授权页，直接推进到 enterprise_verified
		err = s.txManager.ExecuteInTx(ctx, func(txCtx context.Context) error {
			clientCorpID := strings.TrimSpace(record.UnifiedSocialCode)
			if cert.Status == enums.StatusInfoPendingReview {
				if err := cert.ApproveEnterpriseInfoReview("", clientCorpID, cmd.UserID); err != nil {
					return err
				}
			} else if cert.Status == enums.StatusInfoSubmitted {
				if clientCorpID != "" && cert.AuthFlowID == "" {
					cert.AuthFlowID = clientCorpID
				}
			} else {
				return fmt.Errorf("当前状态不允许完成已授权企业认证: %s", enums.GetStatusName(cert.Status))
			}
			return s.completeEnterpriseVerification(txCtx, cert, cert.UserID, record.CompanyName, record.LegalPersonName)
		})
		if err != nil {
			return nil, err
		}
	} else {
		authURL := authRes.AuthShortURL
		if authURL == "" {
			authURL = authRes.AuthURL
		}
		if err := cert.ApproveEnterpriseInfoReview(authURL, authRes.AuthFlowID, cmd.UserID); err != nil {
			return nil, err
		}
		if err := s.aggregateService.SaveCertification(ctx, cert); err != nil {
			return nil, fmt.Errorf("保存认证信息失败: %w", err)
		}
	}

	s.logger.Info("用户已选择签署平台",
		zap.String("user_id", cmd.UserID),
		zap.String("sign_platform", string(platform)),
		zap.Bool("already_verified", alreadyVerified))

	resp := s.convertToResponse(cert)
	meta, _ := s.AddStatusMetadata(ctx, cert)
	resp.Metadata = meta
	return resp, nil
}

// HandleFadadaCallback 法大大回调
func (s *CertificationApplicationServiceImpl) HandleFadadaCallback(ctx context.Context, headers map[string]string, body []byte) error {
	provider, err := s.platformRegistry.Get(enums.SignPlatformFadada)
	if err != nil {
		return err
	}
	if err := provider.VerifyCallback(ctx, headers, body); err != nil {
		return fmt.Errorf("法大大回调验签失败: %w", err)
	}
	ev, err := provider.ParseCallback(ctx, headers, body)
	if err != nil {
		return fmt.Errorf("法大大回调解析失败: %w", err)
	}
	s.logger.Info("收到法大大回调",
		zap.String("event", ev.Event),
		zap.Bool("auth_passed", ev.AuthPassed),
		zap.Bool("sign_completed", ev.SignCompleted),
		zap.String("sign_flow_id", ev.SignFlowID))

	// 认证完成主要依赖 ConfirmAuth / details 轮询；签署完成按任务 ID 兜底推进
	if ev.SignCompleted && ev.SignFlowID != "" {
		cert, err := s.queryRepository.FindByEsignFlowID(ctx, ev.SignFlowID)
		if err == nil && cert != nil && cert.Status == enums.StatusContractApplied {
			_, _ = s.checkAndUpdateSignStatus(ctx, cert)
		}
	}
	return nil
}

func (s *CertificationApplicationServiceImpl) resolveProvider(cert *entities.Certification) (ports.SignPlatformProvider, error) {
	return s.platformRegistry.Get(cert.ResolvedSignPlatform())
}

func (s *CertificationApplicationServiceImpl) generateEnterpriseAuthOrDetectVerifiedWithProvider(
	ctx context.Context,
	provider ports.SignPlatformProvider,
	authReq *ports.EnterpriseAuthRequest,
) (*ports.AuthLinkResult, bool, error) {
	authRes, err := provider.GenerateEnterpriseAuth(ctx, authReq)
	if err == nil {
		return authRes, false, nil
	}

	// 法大大：企业已对本应用授权（210002）= 授权已完成，直接跳过授权页
	if isEnterpriseAlreadyAuthorizedErr(err) {
		s.logger.Info("第三方返回企业已授权，跳过认证链接并视为认证完成",
			zap.String("company_name", authReq.CompanyName),
			zap.String("uscc", authReq.UnifiedSocialCode),
			zap.String("platform", string(provider.Platform())),
			zap.Error(err))
		return nil, true, nil
	}

	// e签宝等：提示已实名时再查一次实名状态确认
	if !isEnterpriseAlreadyRealnamedErr(err) && !strings.Contains(strings.ToLower(err.Error()), "identified") {
		return nil, false, err
	}
	ok, qErr := provider.QueryOrgVerified(ctx, &ports.OrgIdentityQuery{
		OrgName:    authReq.CompanyName,
		OrgIdentNo: authReq.UnifiedSocialCode,
	})
	if qErr != nil {
		return nil, false, fmt.Errorf("%v; 且查询实名状态失败: %w", err, qErr)
	}
	if ok {
		s.logger.Info("第三方返回企业已实名，跳过认证链接并视为认证完成",
			zap.String("company_name", authReq.CompanyName),
			zap.String("platform", string(provider.Platform())))
		return nil, true, nil
	}
	return nil, false, err
}

func (s *CertificationApplicationServiceImpl) appendPlatformSelectMetadata(
	ctx context.Context,
	cert *entities.Certification,
	metadata map[string]interface{},
) map[string]interface{} {
	if metadata == nil {
		metadata = map[string]interface{}{}
	}
	record, err := s.enterpriseInfoSubmitRecordRepo.FindLatestByUserID(ctx, cert.UserID)
	if err != nil || record == nil {
		return metadata
	}
	metadata["manual_review_status"] = record.ManualReviewStatus
	if record.ManualReviewStatus == "approved" &&
		cert.Status == enums.StatusInfoPendingReview &&
		(cert.SignPlatform == "" || cert.AuthURL == "") {
		metadata["need_select_platform"] = true
		platforms := make([]map[string]string, 0, 2)
		for _, p := range s.platformRegistry.List() {
			platforms = append(platforms, map[string]string{
				"platform": string(p.Platform()),
				"name":     enums.GetSignPlatformName(p.Platform()),
			})
		}
		metadata["available_platforms"] = platforms
		metadata["next_action"] = "请选择签署平台以继续企业认证"
	}
	if cert.SignPlatform != "" {
		metadata["sign_platform"] = string(cert.SignPlatform)
		metadata["sign_platform_name"] = enums.GetSignPlatformName(cert.SignPlatform)
	}
	return metadata
}

// ensureContractFill 签署模板路径补齐协议编号与日期（协议编号生成规则与 e签宝一致）
func ensureContractFill(cert *entities.Certification, companyName, uscc, address, repName string) *ports.ContractGenerateRequest {
	if cert.ContractCode == "" {
		cert.SetContractCode(user_entities.GenerateContractCode(user_entities.ContractTypeCooperation))
	}
	signDate := time.Now().Format("2006年01月02日")
	return &ports.ContractGenerateRequest{
		AgreementNo:       cert.ContractCode,
		CompanyName:       companyName,
		UnifiedSocialCode: uscc,
		EnterpriseAddress: address,
		AuthorizedRepName: repName,
		SignDate:          signDate,
	}
}