package audit

import (
	"context"
	"strconv"

	"gorm.io/gorm"

	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/pkg/auditcontext"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
)

// WriteRefundChannelResult 在调用方事务内写入渠道原路退款的调用、恢复与异常事实。
//
// 主资源固定为退款单，渠道原路退款事实作为引用资源；快照只记录业务标识、金额、状态与
// 结构化失败分类，不记录商户密钥、渠道报文或客户收款信息原文。摘要由调用方提供，
// 必须为不含凭证与渠道报文的简短中文说明。
//
// 渠道调用与恢复都由后台任务触发，因此操作者固定为系统任务；审计上下文提供了更具体的
// 操作者标识时沿用，避免任务未装配审计上下文时审计被拒绝并连带回滚业务事务。
func (w *Writer) WriteRefundChannelResult(ctx context.Context, tx *gorm.DB, refund *model.RefundRequest, action, message string) error {
	if refund == nil || refund.ID == 0 || refund.RefundNo == "" {
		return errors.New(errors.CodeInvalidParam, "退款渠道审计资源不完整")
	}
	summary := message
	if summary == "" {
		summary = "渠道原路退款结果更新"
	}
	refundID := strconv.FormatUint(uint64(refund.ID), 10)
	actorID, actorName := constants.AuditActorIDRefundChannel, "退款渠道原路退款任务"
	if linkage := auditcontext.From(ctx); linkage.ActorID != "" {
		actorID = linkage.ActorID
		if linkage.ActorName != "" {
			actorName = linkage.ActorName
		}
	}
	resources := refundChannelResources(refund, refundID, summary)
	// 用 AppendAndGet 而非 Append：渠道调用与恢复的审计属于「要求成功必达」的事实，
	// 必须与业务事实同事务原子提交，失败时向调用方显式返回错误。
	if _, err := w.AppendAndGet(ctx, tx, AppendInput{
		ActionCode: action, Summary: summary,
		Actor:  ActorInput{Kind: constants.AuditActorSystemTask, ID: actorID, Name: actorName},
		Source: constants.AuditSourceWorker, ScopeType: constants.AuditScopePlatform,
		Result: constants.AuditResultSuccess, CorrelationID: refund.RefundNo, Resources: resources,
	}); err != nil {
		return errors.Wrap(errors.CodeDatabaseError, err, "写入退款渠道审计失败")
	}
	return nil
}

// refundChannelResources 构造退款渠道审计资源：退款单为主资源，渠道原路退款事实为引用资源。
func refundChannelResources(refund *model.RefundRequest, refundID, summary string) []ResourceInput {
	return []ResourceInput{
		{
			Type: constants.AuditResourceRefund, ID: &refundID, Key: refund.RefundNo, DisplayName: refund.RefundNo,
			Relation: constants.AuditResourceRelationPrimary, Role: constants.AuditResourceRoleRefundTarget,
			IdentitySnapshot: map[string]any{
				"id": refund.ID, "refund_no": refund.RefundNo, "method": refund.Method,
				"frozen_actual_received_amount": refund.FrozenActualReceivedAmount,
				"requested_refund_amount":       refund.RequestedRefundAmount,
				"approved_refund_amount":        refund.ApprovedRefundAmount,
				"status":                        refund.Status,
				"channel_refund_status":         refund.ChannelRefundStatus,
				"channel_refund_no":             refund.ChannelRefundNo,
				"channel_refund_request_no":     refund.ChannelRefundRequestNo,
				"channel_refund_amount":         refund.ChannelRefundAmount,
				"failure_reason":                refund.FailureReason,
				"anomaly_flag":                  refund.AnomalyFlag,
			},
			AfterData:         channelRefundState(refund),
			SubjectVisibility: constants.AuditSubjectResult, SubjectSummary: summary,
		},
		{
			Type: constants.AuditResourceRefundChannelRefund, ID: &refundID, Key: refund.RefundNo,
			DisplayName: "渠道原路退款 " + refund.RefundNo,
			Relation:    constants.AuditResourceRelationReference, Role: constants.AuditResourceRoleRefundChannelRefund,
			IdentitySnapshot: map[string]any{
				"id": refund.ID, "refund_no": refund.RefundNo,
				"channel_refund_status":     refund.ChannelRefundStatus,
				"channel_refund_no":         refund.ChannelRefundNo,
				"channel_refund_request_no": refund.ChannelRefundRequestNo,
				"channel_refund_amount":     refund.ChannelRefundAmount,
				"failure_reason":            refund.FailureReason,
				"anomaly_flag":              refund.AnomalyFlag,
			},
		},
	}
}

// channelRefundState 构造渠道原路退款状态快照，只包含状态与结构化失败分类。
func channelRefundState(refund *model.RefundRequest) map[string]any {
	state := map[string]any{
		"status":                refund.Status,
		"channel_refund_status": refund.ChannelRefundStatus,
		"channel_refund_amount": refund.ChannelRefundAmount,
		"failure_reason":        refund.FailureReason,
		"anomaly_flag":          refund.AnomalyFlag,
	}
	if refund.ChannelRefundedAt != nil {
		state["channel_refunded_at"] = *refund.ChannelRefundedAt
	}
	return state
}