package audit

import (
	"context"
	"strconv"

	"gorm.io/gorm"

	distributionapp "github.com/break/junhong_cmp_fiber/internal/application/distributionwithdrawal"
	distributiondomain "github.com/break/junhong_cmp_fiber/internal/domain/distribution"
	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
)

// WriteDistributionWithdrawal 将分销注册、提现资格与提现审批事实写入统一 Audit Event。
// 审计只记录脱敏手机号与证件号、附件数量与对象键引用，绝不记录密码、完整证件号或附件内容。
func (w *Writer) WriteDistributionWithdrawal(
	ctx context.Context,
	tx *gorm.DB,
	change distributionapp.AuditChange,
) error {
	resources := make([]ResourceInput, 0, 6)
	if change.Registration != nil && change.Registration.ID != 0 {
		resources = append(resources, registrationResource(change))
	}
	if change.ParentShop != nil && change.ParentShop.ID != 0 {
		resource := ShopResource(change.ParentShop, constants.AuditResourceRelationReference,
			constants.AuditResourceRoleDistributionParentShop)
		resource.SubjectVisibility = constants.AuditSubjectInternalOnly
		resources = append(resources, resource)
	}
	if change.Qualification != nil && change.Qualification.ID != 0 {
		resources = append(resources, qualificationResource(change))
	}
	if change.Withdrawal != nil && change.Withdrawal.ID != 0 {
		resources = append(resources, withdrawalResource(change))
	}
	if change.Attempt != nil && change.Attempt.ID != 0 {
		resources = append(resources, withdrawalAttemptResource(change.Attempt))
	}
	if change.Shop != nil && change.Shop.ID != 0 {
		resource := ShopResource(change.Shop, constants.AuditResourceRelationReference,
			constants.AuditResourceRoleQualificationShop)
		resource.SubjectVisibility = constants.AuditSubjectInternalOnly
		resources = append(resources, resource)
	}
	if change.CreatedShop != nil && change.CreatedShop.ID != 0 {
		shop := change.CreatedShop
		resource := ShopResource(shop, constants.AuditResourceRelationAffected,
			constants.AuditResourceRoleShopTarget)
		resource.SubjectVisibility = constants.AuditSubjectResult
		resource.SubjectSummary = change.Summary
		// 新建店铺自己的分销码：注册记录上的码是上级码快照，这里必须记录本次生成的店铺码，
		// 否则「分销码生成」在审批建店路径没有审计事实，与后台建店路径不对称。
		if shop.DistributionCode != "" {
			resource.IdentitySnapshot["distribution_code_masked"] =
				distributiondomain.MaskDistributionCode(shop.DistributionCode)
		}
		resource.AfterData = map[string]any{
			"shop_name": shop.ShopName, "shop_code": shop.ShopCode,
			"distribution_code_masked":         distributiondomain.MaskDistributionCode(shop.DistributionCode),
			"applied_distribution_code_masked": distributiondomain.MaskDistributionCode(change.AppliedDistributionCode),
			"status":                           shop.Status,
		}
		resources = append(resources, resource)
	}
	if change.Wallet != nil && change.Wallet.ID != 0 {
		resource := agentWalletAuditResource(change.Wallet, constants.AuditResourceRelationAffected,
			constants.AuditResourceRoleWithdrawalWallet)
		resource.SubjectVisibility = constants.AuditSubjectInternalOnly
		resources = append(resources, resource)
	}
	if change.Transaction != nil && change.Transaction.ID != 0 {
		resource := agentWalletTransactionResource(change.Transaction)
		resource.Relation = constants.AuditResourceRelationAffected
		resource.Role = constants.AuditResourceRoleWithdrawalTransaction
		resource.SubjectVisibility = constants.AuditSubjectInternalOnly
		resources = append(resources, resource)
	}
	if len(resources) == 0 {
		return errors.New(errors.CodeInvalidParam, "分销或提现审计缺少可追溯资源")
	}
	// 规范化关系：审计事件必须且恰好有一个主要资源。
	// 失败/拒绝审计在业务事务回滚后重放，此时业务对象可能尚未落库（ID 为 0）而被跳过，
	// 或变更只带店铺上下文，因此这里统一收敛：优先保留业务主资源，
	// 没有业务主资源时用店铺承载主资源，其余资源一律降为引用。
	primaryIndex := -1
	for index := range resources {
		if resources[index].Relation == constants.AuditResourceRelationPrimary {
			primaryIndex = index
			break
		}
	}
	if primaryIndex == -1 {
		for index := range resources {
			if resources[index].Type == constants.AuditResourceShop {
				resources[index].Relation = constants.AuditResourceRelationPrimary
				primaryIndex = index
				break
			}
		}
	}
	if primaryIndex == -1 {
		return errors.New(errors.CodeInvalidParam, "分销或提现审计缺少可追溯资源")
	}
	for index := range resources {
		if index != primaryIndex && resources[index].Relation == constants.AuditResourceRelationPrimary {
			resources[index].Relation = constants.AuditResourceRelationReference
		}
	}
	result := change.Result
	if result == "" {
		result = constants.AuditResultSuccess
	}
	// 用 AppendAndGet 而非 Append：分销注册、资格与提现终审的审计属于「要求成功必达」的事实，
	// 必须与业务事实同事务原子提交。Append 会吞掉错误，导致审计插入失败后事务被 PG 置为
	// aborted，最终只表现为难以定位的提交失败；这里显式返回错误。
	if _, err := w.AppendAndGet(ctx, tx, AppendInput{
		EventID: change.EventID, ActionCode: change.ActionCode, Summary: change.Summary,
		ScopeType: constants.AuditScopePlatform, Result: result,
		ErrorCode: change.ErrorCode, ErrorSummary: change.ErrorSummary,
		CorrelationID: change.CorrelationID, Metadata: auditMetadata(change), Resources: resources,
	}); err != nil {
		return errors.Wrap(errors.CodeDatabaseError, err, "写入分销或提现审计失败")
	}
	return nil
}

// registrationResource 构造扫码注册记录审计资源，手机号与分销码只记录脱敏值。
func registrationResource(change distributionapp.AuditChange) ResourceInput {
	registration := change.Registration
	id := strconv.FormatUint(uint64(registration.ID), 10)
	instanceID := uint(0)
	if registration.ApprovalInstanceID != nil {
		instanceID = *registration.ApprovalInstanceID
	}
	return ResourceInput{
		Type: constants.AuditResourceAgentDistributionRegistration, ID: &id, Key: id,
		DisplayName: "扫码注册记录 " + id,
		Relation:    constants.AuditResourceRelationPrimary,
		Role:        constants.AuditResourceRoleDistributionRegistration,
		IdentitySnapshot: map[string]any{
			"id": registration.ID, "parent_shop_id": registration.ParentShopID,
			"distribution_code_masked": distributiondomain.MaskDistributionCode(registration.DistributionCode),
			"phone_masked":             distributiondomain.MaskPhone(registration.Phone),
			"username":                 registration.Username, "shop_code": registration.ShopCode,
			"status": registration.Status, "approval_instance_id": instanceID,
			"reject_reason": registration.RejectReason,
		},
		BeforeData: change.BeforeData, AfterData: change.AfterData,
		SubjectVisibility: constants.AuditSubjectResult, SubjectSummary: change.Summary,
	}
}

// qualificationResource 构造提现资料资格版本审计资源，证件号只记录脱敏值。
func qualificationResource(change distributionapp.AuditChange) ResourceInput {
	qualification := change.Qualification
	id := strconv.FormatUint(uint64(qualification.ID), 10)
	instanceID := uint(0)
	if qualification.ApprovalInstanceID != nil {
		instanceID = *qualification.ApprovalInstanceID
	}
	return ResourceInput{
		Type: constants.AuditResourceWithdrawalQualification, ID: &id, Key: id,
		DisplayName: "提现资料资格版本 " + id,
		Relation:    constants.AuditResourceRelationPrimary,
		Role:        constants.AuditResourceRoleQualificationTarget,
		IdentitySnapshot: map[string]any{
			"id": qualification.ID, "shop_id": qualification.ShopID,
			"subject_type":        qualification.SubjectType,
			"subject_code_masked": distributiondomain.MaskSubjectCode(qualification.SubjectCode),
			"status":              qualification.Status, "approval_instance_id": instanceID,
			"invalid_reason": qualification.InvalidReason,
		},
		BeforeData: change.BeforeData, AfterData: change.AfterData,
		SubjectVisibility: constants.AuditSubjectResult, SubjectSummary: change.Summary,
	}
}

// withdrawalResource 构造提现单审计资源，并附加本次审批尝试记录的引用资源。
func withdrawalResource(change distributionapp.AuditChange) ResourceInput {
	withdrawal := change.Withdrawal
	resource := CommissionWithdrawalResource(withdrawal, constants.AuditResourceRelationPrimary,
		constants.AuditResourceRoleWithdrawalTarget, change.BeforeData, change.AfterData)
	resource.SubjectVisibility = constants.AuditSubjectResult
	resource.SubjectSummary = change.Summary
	return resource
}

// withdrawalAttemptResource 构造提现审批尝试记录审计资源，用于审批实例关联追踪。
func withdrawalAttemptResource(attempt *model.CommissionWithdrawalRequestAttempt) ResourceInput {
	id := strconv.FormatUint(uint64(attempt.ID), 10)
	instanceID := uint(0)
	if attempt.ApprovalInstanceID != nil {
		instanceID = *attempt.ApprovalInstanceID
	}
	return ResourceInput{
		Type: constants.AuditResourceCommissionWithdrawalAttempt, ID: &id, Key: id,
		DisplayName: "提现审批尝试 " + id,
		Relation:    constants.AuditResourceRelationReference,
		Role:        constants.AuditResourceRoleWithdrawalAttempt,
		IdentitySnapshot: map[string]any{
			"id": attempt.ID, "request_id": attempt.RequestID, "attempt_no": attempt.AttemptNo,
			"amount": attempt.Amount, "fee": attempt.Fee, "actual_amount": attempt.ActualAmount,
			"approval_instance_id": instanceID, "released_at": attempt.ReleasedAt,
		},
		SubjectVisibility: constants.AuditSubjectInternalOnly,
	}
}

// auditMetadata 提取审计元数据，避免与资源明细重复。
func auditMetadata(change distributionapp.AuditChange) map[string]any {
	metadata := map[string]any{}
	if change.Registration != nil {
		metadata["registration_status"] = change.Registration.Status
	}
	if change.Qualification != nil {
		metadata["qualification_status"] = change.Qualification.Status
		metadata["qualification_subject_type"] = change.Qualification.SubjectType
	}
	if change.Attempt != nil {
		metadata["attempt_no"] = change.Attempt.AttemptNo
		metadata["amount"] = change.Attempt.Amount
		metadata["fee"] = change.Attempt.Fee
		metadata["actual_amount"] = change.Attempt.ActualAmount
	}
	if change.Withdrawal != nil {
		metadata["withdrawal_status"] = change.Withdrawal.Status
		metadata["anomaly_flag"] = change.Withdrawal.AnomalyFlag
	}
	if change.CreatedShop != nil {
		metadata["created_shop_id"] = change.CreatedShop.ID
		if change.CreatedShop.DistributionCode != "" {
			metadata["distribution_code_masked"] =
				distributiondomain.MaskDistributionCode(change.CreatedShop.DistributionCode)
		}
	}
	if len(metadata) == 0 {
		return nil
	}
	return metadata
}