package distributionwithdrawal

import (
	"context"
	"crypto/rand"
	"math/big"
	"strings"
	"time"

	"github.com/bytedance/sonic"
	"github.com/google/uuid"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"

	approvalapp "github.com/break/junhong_cmp_fiber/internal/application/approval"
	distributiondomain "github.com/break/junhong_cmp_fiber/internal/domain/distribution"
	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/internal/store/postgres"
	"github.com/break/junhong_cmp_fiber/pkg/constants"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
	"github.com/break/junhong_cmp_fiber/pkg/middleware"
)

// WithdrawalPolicy 是提现申请使用的当前配置快照，由调用方从提现配置读取。
type WithdrawalPolicy struct {
	MinAmount            int64
	FeeRate              int64
	DailyWithdrawalLimit int
}

// WithdrawalInput 是提现申请或重提的规范化输入。
type WithdrawalInput struct {
	Amount           int64
	WithdrawalMethod string
	AccountName      string
	AccountNumber    string
	InvoiceKeys      []string
}

// WithdrawalResult 返回已原子保存的提现申请与审批尝试记录。
type WithdrawalResult struct {
	RequestID          uint
	WithdrawalNo       string
	AttemptID          uint
	AttemptNo          int
	Amount             int64
	Fee                int64
	FeeRate            int64
	ActualAmount       int64
	Status             int
	ApprovalInstanceID uint
	ApprovalStatus     int
	CreatedAt          time.Time
}

// WithdrawalService 创建与重提提现申请。
// 申请、审批尝试记录、审批实例与佣金钱包冻结在同一事务完成；
// 余额不足、资格无效或非本人代理时不创建申请、审批实例或任何冻结。
type WithdrawalService struct {
	db       *gorm.DB
	approval approvalapp.Port
	audit    AuditWriter
}

// NewWithdrawalService 创建提现申请用例。
func NewWithdrawalService(db *gorm.DB, approval approvalapp.Port, audit AuditWriter) *WithdrawalService {
	return &WithdrawalService{db: db, approval: approval, audit: audit}
}

// Create 为本人代理店铺创建提现申请。
func (s *WithdrawalService) Create(
	ctx context.Context,
	shopID uint,
	policy WithdrawalPolicy,
	input WithdrawalInput,
) (*WithdrawalResult, error) {
	if err := s.ensureReady(); err != nil {
		return nil, err
	}
	if err := ensureOwnAgentShop(ctx, shopID); err != nil {
		return nil, errors.New(errors.CodeForbidden, "仅可为本人店铺发起提现")
	}
	return s.submit(ctx, shopID, policy, nil, input)
}

// Resubmit 由本人代理修改金额、收款信息与本次发票后重提已被企业微信驳回的提现申请。
// 事务内先释放旧未结算尝试的冻结，再按新金额冻结；历史快照与审批结果不被覆盖。
func (s *WithdrawalService) Resubmit(
	ctx context.Context,
	requestID uint,
	policy WithdrawalPolicy,
	input WithdrawalInput,
) (*WithdrawalResult, error) {
	if err := s.ensureReady(); err != nil {
		return nil, err
	}
	if requestID == 0 {
		return nil, errors.New(errors.CodeNotFound, "提现申请不存在")
	}
	return s.submit(ctx, 0, policy, &requestID, input)
}

// ensureReady 校验依赖完整，缺失时失败关闭，避免绕过企业微信终审。
func (s *WithdrawalService) ensureReady() error {
	if s == nil || s.db == nil || s.approval == nil || s.audit == nil {
		return errors.New(errors.CodeServiceUnavailable, "提现申请能力尚未配置")
	}
	return nil
}

// submit 在同一事务内完成资格校验、钱包加锁冻结、写申请与审批尝试记录、创建审批实例。
func (s *WithdrawalService) submit(
	ctx context.Context,
	shopID uint,
	policy WithdrawalPolicy,
	resubmitRequestID *uint,
	input WithdrawalInput,
) (*WithdrawalResult, error) {
	submitter, err := currentSubmitter(ctx)
	if err != nil {
		return nil, err
	}
	if input.Amount <= 0 {
		return nil, errors.New(errors.CodeInvalidParam, "提现金额必须大于 0")
	}
	if policy.MinAmount > 0 && input.Amount < policy.MinAmount {
		return nil, errors.New(errors.CodeInvalidParam, "提现金额低于当前最低提现额度")
	}
	correlationID := "commission_withdrawal:" + uuid.NewString()
	preparation, err := s.approval.Prepare(ctx, approvalapp.PrepareRequest{
		BusinessType:       constants.ApprovalBusinessTypeCommissionWithdrawal,
		SubmitterAccountID: submitter.ID, CorrelationID: correlationID,
	})
	if err != nil {
		return nil, err
	}
	result := &WithdrawalResult{}
	err = s.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		var request *model.CommissionWithdrawalRequest
		if resubmitRequestID != nil {
			request, err = lockWithdrawalRequest(ctx, tx, *resubmitRequestID)
			if err != nil {
				return err
			}
			if request.ShopID != submitter.ShopID {
				return errors.New(errors.CodeNotFound, "提现申请不存在")
			}
			if request.Status != constants.WithdrawalStatusRejected {
				return errors.New(errors.CodeConflict, "仅已被驳回的提现申请可重提")
			}
			if request.ApprovalInstanceID == nil {
				return errors.New(errors.CodeConflict, "存量提现申请不支持企业微信重提")
			}
			// 重提先释放旧未结算尝试的冻结，避免产生第二笔冻结。
			if _, err := releaseUnsettledAttemptsForRequest(ctx, tx, request.ID); err != nil {
				return err
			}
			shopID = request.ShopID
		}
		if err := ensureOwnAgentShopForShopID(ctx, submitter, shopID); err != nil {
			return err
		}
		qualification, err := loadValidQualification(ctx, tx, shopID)
		if err != nil {
			return err
		}
		if err := validateWithdrawalInvoice(qualification, input.InvoiceKeys); err != nil {
			return err
		}
		if err := ensureDailyWithdrawalLimit(ctx, tx, shopID, policy.DailyWithdrawalLimit, resubmitRequestID == nil); err != nil {
			return err
		}
		wallet, err := lockCommissionWallet(ctx, tx, shopID)
		if err != nil {
			return err
		}
		fee := input.Amount * policy.FeeRate / 10000
		actualAmount := input.Amount - fee
		if err := freezeCommissionBalance(ctx, tx, wallet, input.Amount); err != nil {
			return err
		}
		accountInfo, err := marshalJSON(map[string]string{
			"account_name": input.AccountName, "account_number": input.AccountNumber,
		})
		if err != nil {
			return err
		}
		invoiceKeys, err := marshalJSON(normalizeInvoiceKeys(input.InvoiceKeys))
		if err != nil {
			return err
		}
		if request == nil {
			request = &model.CommissionWithdrawalRequest{
				WithdrawalNo:     generateWithdrawalNo(),
				ShopID:           shopID,
				AgentID:          submitter.ID,
				ApplicantID:      submitter.ID,
				Amount:           input.Amount,
				FeeRate:          policy.FeeRate,
				Fee:              fee,
				ActualAmount:     actualAmount,
				WithdrawalMethod: input.WithdrawalMethod,
				AccountInfo:      accountInfo,
				Status:           constants.WithdrawalStatusPending,
			}
			request.Creator = submitter.ID
			request.Updater = submitter.ID
			if err := tx.WithContext(ctx).Create(request).Error; err != nil {
				return errors.Wrap(errors.CodeDatabaseError, err, "创建提现申请失败")
			}
		} else {
			if err := updateWithdrawalRequestForResubmit(ctx, tx, request, input, policy, fee, actualAmount, accountInfo); err != nil {
				return err
			}
		}
		attemptNo, err := nextWithdrawalAttemptNo(ctx, tx, request.ID)
		if err != nil {
			return err
		}
		attempt := &model.CommissionWithdrawalRequestAttempt{
			RequestID: request.ID, AttemptNo: attemptNo,
			Amount: input.Amount, Fee: fee, FeeRate: policy.FeeRate, ActualAmount: actualAmount,
			WithdrawalMethod: input.WithdrawalMethod, AccountInfo: accountInfo,
			InvoiceKeys: invoiceKeys, SubmittedByAccountID: submitter.ID,
		}
		if err := tx.WithContext(ctx).Create(attempt).Error; err != nil {
			return errors.Wrap(errors.CodeDatabaseError, err, "创建提现审批尝试记录失败")
		}
		submitterSnapshot, requestSnapshot, err := approvalSnapshots(submitter.ID, submitter.Username,
			withdrawalApprovalForm(request, attempt, shopName(ctx, tx, shopID)))
		if err != nil {
			return err
		}
		reference, err := createApprovalInTx(ctx, tx, s.approval, preparation,
			constants.ApprovalBusinessTypeCommissionWithdrawal, attempt.ID, submitter.ID,
			submitterSnapshot, requestSnapshot, correlationID)
		if err != nil {
			return err
		}
		if err := attachWithdrawalAttemptInstance(ctx, tx, attempt, reference.InstanceID); err != nil {
			return err
		}
		if err := updateWithdrawalLatest(ctx, tx, request, attempt, reference.InstanceID); err != nil {
			return err
		}
		transaction, err := recordWithdrawalFreezeTransaction(ctx, tx, wallet, request, submitter.ID, input.Amount)
		if err != nil {
			return err
		}
		eventID, err := composeAuditEventID(
			"commission-withdrawal", uintText(request.ID), "attempt", intText(attempt.AttemptNo), "submit")
		if err != nil {
			return err
		}
		if err := s.audit.WriteDistributionWithdrawal(ctx, tx, AuditChange{
			EventID: eventID, ActionCode: constants.AuditActionCommissionWithdrawalAttemptSubmitted,
			Summary: withdrawalSubmitSummary(resubmitRequestID != nil), CorrelationID: correlationID,
			Withdrawal: request, Attempt: attempt, Wallet: wallet, Transaction: transaction,
			AfterData: withdrawalAuditSnapshot(request, attempt, wallet),
		}); err != nil {
			return err
		}
		result.RequestID = request.ID
		result.WithdrawalNo = request.WithdrawalNo
		result.AttemptID = attempt.ID
		result.AttemptNo = attempt.AttemptNo
		result.Amount = attempt.Amount
		result.Fee = attempt.Fee
		result.FeeRate = attempt.FeeRate
		result.ActualAmount = attempt.ActualAmount
		result.Status = request.Status
		result.ApprovalInstanceID = reference.InstanceID
		result.ApprovalStatus = reference.Status
		result.CreatedAt = request.CreatedAt
		return nil
	})
	if err != nil {
		// 失败审计必须可追溯：带上店铺（shopID 在手上），使审计恰好有一个主要资源。
		RecordFailure(ctx, s.db, s.audit, AuditChange{
			// 不手工构造 EventID：同一店铺的提现可被拒绝多次，手工 ID 会让后续拒绝被
			// event_id 唯一约束吞掉；由审计 Writer 生成唯一 evt_<uuid>。
			ActionCode: constants.AuditActionCommissionWithdrawalAttemptRejected,
			Summary:    "提交提现申请被拒绝", CorrelationID: correlationID,
			Shop: failureShopResolved(ctx, s.db, shopID, resubmitRequestID),
		}, err)
		return nil, err
	}
	return result, nil
}

// failureShopResolved 为失败审计解析店铺引用：优先用入参 shopID，
// Resubmit 场景下 shopID 为空则从提现申请行回查店铺，保证拒绝事实有可追溯的店铺主资源。
func failureShopResolved(ctx context.Context, db *gorm.DB, shopID uint, requestID *uint) *model.Shop {
	if shopID == 0 && requestID != nil {
		var request model.CommissionWithdrawalRequest
		if err := db.WithContext(ctx).Select("id", "shop_id").First(&request, *requestID).Error; err == nil {
			shopID = request.ShopID
		}
	}
	return failureShop(ctx, db, shopID)
}

// failureShop 为失败审计解析店铺引用；店铺查询失败时退回仅含 ID 的最小引用，
// 保证拒绝事实仍有可追溯的店铺主资源。
func failureShop(ctx context.Context, db *gorm.DB, shopID uint) *model.Shop {
	if shopID == 0 {
		return nil
	}
	if shop := loadShopOrNil(ctx, db, shopID); shop != nil {
		return shop
	}
	// gorm.Model 的 ID 是提升字段，无法在复合字面量中设置，这里显式赋值。
	minimal := &model.Shop{}
	minimal.ID = shopID
	return minimal
}

// withdrawalSubmitter 是发起提现的真实操作者。
type withdrawalSubmitter struct {
	ID       uint
	Username string
	ShopID   uint
}

// currentSubmitter 从上下文取当前代理账号与其店铺，未认证时拒绝。
func currentSubmitter(ctx context.Context) (withdrawalSubmitter, error) {
	accountID := middleware.GetUserIDFromContext(ctx)
	if accountID == 0 {
		return withdrawalSubmitter{}, errors.New(errors.CodeUnauthorized, "未授权访问")
	}
	shopID := middleware.GetShopIDFromContext(ctx)
	if shopID == 0 {
		return withdrawalSubmitter{}, errors.New(errors.CodeForbidden, "代理账号缺少店铺信息")
	}
	return withdrawalSubmitter{
		ID: accountID, Username: middleware.GetUsernameFromContext(ctx), ShopID: shopID,
	}, nil
}

// ensureOwnAgentShopForShopID 复核代理身份与店铺归属，越权与不存在返回同一结果。
func ensureOwnAgentShopForShopID(ctx context.Context, submitter withdrawalSubmitter, shopID uint) error {
	if shopID == 0 || shopID != submitter.ShopID {
		return errors.New(errors.CodeForbidden, "仅可为本人店铺发起提现")
	}
	if middleware.GetUserTypeFromContext(ctx) != constants.UserTypeAgent {
		return errors.New(errors.CodeForbidden, "仅可为本人店铺发起提现")
	}
	return nil
}

// loadValidQualification 读取当前有效的提现资料资格；缺失或已失效时拒绝提现申请。
func loadValidQualification(
	ctx context.Context,
	tx *gorm.DB,
	shopID uint,
) (*model.WithdrawalQualification, error) {
	var qualification model.WithdrawalQualification
	err := tx.WithContext(ctx).
		Where("shop_id = ? AND status = ?", shopID, constants.WithdrawalQualificationStatusApproved).
		First(&qualification).Error
	if err == gorm.ErrRecordNotFound {
		return nil, errors.New(errors.CodeInvalidStatus, "提现资料资格无效，请先完成资料审批")
	}
	if err != nil {
		return nil, errors.Wrap(errors.CodeDatabaseError, err, "查询有效提现资料资格失败")
	}
	var shop model.Shop
	if err := tx.WithContext(ctx).Select("id", "status").First(&shop, shopID).Error; err != nil {
		return nil, errors.New(errors.CodeInvalidStatus, "提现资料资格无效，请先完成资料审批")
	}
	if shop.Status != constants.ShopStatusEnabled {
		return nil, errors.New(errors.CodeInvalidStatus, "店铺已停用，提现资料资格已失效")
	}
	return &qualification, nil
}

// validateWithdrawalInvoice 校验申请级发票仅在企业主体且已登记发票资料时提交。
func validateWithdrawalInvoice(qualification *model.WithdrawalQualification, invoiceKeys []string) error {
	keys := normalizeInvoiceKeys(invoiceKeys)
	if len(keys) == 0 {
		return nil
	}
	if qualification.SubjectType != constants.WithdrawalQualificationSubjectTypeEnterprise {
		return errors.New(errors.CodeInvalidParam, "发票仅企业主体可提交")
	}
	if qualification.InvoiceSubjectCode == "" || qualification.InvoiceTitle == "" {
		return errors.New(errors.CodeInvalidParam, "有效提现资料资格未登记发票资料")
	}
	return nil
}

// normalizeInvoiceKeys 归一化发票对象键列表，去除空串。
func normalizeInvoiceKeys(keys []string) []string {
	result := make([]string, 0, len(keys))
	for _, key := range keys {
		if trimmed := strings.TrimSpace(key); trimmed != "" {
			result = append(result, trimmed)
		}
	}
	return result
}

// ensureDailyWithdrawalLimit 校验当日提现次数上限；重提不占用新的当日次数。
func ensureDailyWithdrawalLimit(
	ctx context.Context,
	tx *gorm.DB,
	shopID uint,
	limit int,
	countNewRequest bool,
) error {
	if !countNewRequest || limit <= 0 {
		return nil
	}
	today := time.Now().Format("2006-01-02")
	var todayCount int64
	if err := tx.WithContext(ctx).Model(&model.CommissionWithdrawalRequest{}).
		Where("shop_id = ? AND created_at >= ? AND created_at <= ?", shopID, today+" 00:00:00", today+" 23:59:59").
		Count(&todayCount).Error; err != nil {
		return errors.Wrap(errors.CodeDatabaseError, err, "查询当日提现次数失败")
	}
	if int(todayCount) >= limit {
		return errors.New(errors.CodeInvalidParam, "今日提现次数已达上限")
	}
	return nil
}

// lockWithdrawalRequest 以行锁读取提现申请，未找到返回稳定不存在错误。
func lockWithdrawalRequest(
	ctx context.Context,
	tx *gorm.DB,
	id uint,
) (*model.CommissionWithdrawalRequest, error) {
	var request model.CommissionWithdrawalRequest
	if err := tx.WithContext(ctx).Clauses(clause.Locking{Strength: "UPDATE"}).
		First(&request, id).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, errors.New(errors.CodeNotFound, "提现申请不存在")
		}
		return nil, errors.Wrap(errors.CodeDatabaseError, err, "锁定提现申请失败")
	}
	return &request, nil
}

// lockCommissionWallet 以行锁读取店铺佣金钱包。
func lockCommissionWallet(ctx context.Context, tx *gorm.DB, shopID uint) (*model.AgentWallet, error) {
	var wallet model.AgentWallet
	if err := tx.WithContext(ctx).Clauses(clause.Locking{Strength: "UPDATE"}).
		Where("shop_id = ? AND wallet_type = ?", shopID, constants.AgentWalletTypeCommission).
		First(&wallet).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			return nil, errors.New(errors.CodeNotFound, "店铺佣金钱包不存在")
		}
		return nil, errors.Wrap(errors.CodeDatabaseError, err, "锁定店铺佣金钱包失败")
	}
	return &wallet, nil
}

// freezeCommissionBalance 以条件更新冻结可提现余额，影响行数不为 1 时判定余额不足。
func freezeCommissionBalance(
	ctx context.Context,
	tx *gorm.DB,
	wallet *model.AgentWallet,
	amount int64,
) error {
	result := tx.WithContext(ctx).Model(&model.AgentWallet{}).
		Where("id = ? AND wallet_type = ? AND balance - frozen_balance >= ?",
			wallet.ID, constants.AgentWalletTypeCommission, amount).
		Updates(map[string]any{
			"frozen_balance": gorm.Expr("frozen_balance + ?", amount),
			"updated_at":     time.Now(),
		})
	if result.Error != nil {
		return errors.Wrap(errors.CodeDatabaseError, result.Error, "冻结可提现余额失败")
	}
	if result.RowsAffected != 1 {
		return errors.New(errors.CodeInsufficientBalance, "可提现余额不足或并发冲突，请稍后重试")
	}
	wallet.FrozenBalance += amount
	return nil
}

// releaseCommissionBalance 以条件更新释放冻结余额并返回释放是否发生。
// 释放金额取尝试记录事实，重复释放不会重复调整余额。
func releaseCommissionBalance(
	ctx context.Context,
	tx *gorm.DB,
	walletID uint,
	amount int64,
) (bool, error) {
	result := tx.WithContext(ctx).Model(&model.AgentWallet{}).
		Where("id = ? AND wallet_type = ? AND frozen_balance >= ?",
			walletID, constants.AgentWalletTypeCommission, amount).
		Updates(map[string]any{
			"frozen_balance": gorm.Expr("frozen_balance - ?", amount),
			"updated_at":     time.Now(),
		})
	if result.Error != nil {
		return false, errors.Wrap(errors.CodeDatabaseError, result.Error, "释放冻结余额失败")
	}
	return result.RowsAffected == 1, nil
}

// nextWithdrawalAttemptNo 返回该申请的下一条审批尝试序号；申请行已加锁，序号在同一事务内唯一。
func nextWithdrawalAttemptNo(ctx context.Context, tx *gorm.DB, requestID uint) (int, error) {
	var row struct {
		MaxAttemptNo int
	}
	if err := tx.WithContext(ctx).Model(&model.CommissionWithdrawalRequestAttempt{}).
		Select("COALESCE(MAX(attempt_no), 0) AS max_attempt_no").
		Where("request_id = ?", requestID).Scan(&row).Error; err != nil {
		return 0, errors.Wrap(errors.CodeDatabaseError, err, "查询提现审批尝试序号失败")
	}
	if row.MaxAttemptNo >= constants.WithdrawalAttemptMaxCount {
		return 0, errors.New(errors.CodeConflict, "提现重提次数已达上限，请联系平台处理")
	}
	return row.MaxAttemptNo + 1, nil
}

// updateWithdrawalRequestForResubmit 以已驳回状态条件更新申请为最新尝试的镜像。
func updateWithdrawalRequestForResubmit(
	ctx context.Context,
	tx *gorm.DB,
	request *model.CommissionWithdrawalRequest,
	input WithdrawalInput,
	policy WithdrawalPolicy,
	fee int64,
	actualAmount int64,
	accountInfo []byte,
) error {
	result := tx.WithContext(ctx).Model(&model.CommissionWithdrawalRequest{}).
		Where("id = ? AND status = ?", request.ID, constants.WithdrawalStatusRejected).
		Updates(map[string]any{
			"amount": input.Amount, "fee": fee, "fee_rate": policy.FeeRate, "actual_amount": actualAmount,
			"withdrawal_method": input.WithdrawalMethod, "account_info": accountInfo,
			"status": constants.WithdrawalStatusPending, "processed_at": nil,
			"reject_reason": "", "updater": request.ApplicantID,
		})
	if result.Error != nil {
		return errors.Wrap(errors.CodeDatabaseError, result.Error, "更新提现申请重提内容失败")
	}
	if result.RowsAffected != 1 {
		return errors.New(errors.CodeConflict, "提现申请状态已变化，请刷新后重试")
	}
	request.Amount = input.Amount
	request.Fee = fee
	request.FeeRate = policy.FeeRate
	request.ActualAmount = actualAmount
	request.WithdrawalMethod = input.WithdrawalMethod
	request.AccountInfo = accountInfo
	request.Status = constants.WithdrawalStatusPending
	request.ProcessedAt = nil
	request.RejectReason = ""
	return nil
}

// attachWithdrawalAttemptInstance 回写尝试记录关联的审批实例，写入一次后不可修改。
func attachWithdrawalAttemptInstance(
	ctx context.Context,
	tx *gorm.DB,
	attempt *model.CommissionWithdrawalRequestAttempt,
	instanceID uint,
) error {
	result := tx.WithContext(ctx).Model(&model.CommissionWithdrawalRequestAttempt{}).
		Where("id = ? AND approval_instance_id IS NULL", attempt.ID).
		Update("approval_instance_id", instanceID)
	if result.Error != nil {
		return errors.Wrap(errors.CodeDatabaseError, result.Error, "关联提现审批实例失败")
	}
	if result.RowsAffected != 1 {
		return errors.New(errors.CodeConflict, "提现审批实例关联已变化")
	}
	attempt.ApprovalInstanceID = &instanceID
	return nil
}

// updateWithdrawalLatest 回填申请的最新尝试与审批实例引用，仅用于列表投影。
func updateWithdrawalLatest(
	ctx context.Context,
	tx *gorm.DB,
	request *model.CommissionWithdrawalRequest,
	attempt *model.CommissionWithdrawalRequestAttempt,
	instanceID uint,
) error {
	updates := map[string]any{
		"latest_attempt_id": attempt.ID, "latest_approval_instance_id": instanceID,
	}
	if request.ApprovalInstanceID == nil {
		// 首次接入企业微信审批时记录稳定门禁标识，本地人工终审据此拒绝。
		updates["approval_instance_id"] = instanceID
	}
	result := tx.WithContext(ctx).Model(&model.CommissionWithdrawalRequest{}).
		Where("id = ?", request.ID).Updates(updates)
	if result.Error != nil {
		return errors.Wrap(errors.CodeDatabaseError, result.Error, "回填提现申请最新审批实例失败")
	}
	if result.RowsAffected != 1 {
		return errors.New(errors.CodeConflict, "提现申请最新审批实例回填已变化")
	}
	request.LatestAttemptID = attempt.ID
	request.LatestApprovalInstanceID = instanceID
	if request.ApprovalInstanceID == nil {
		request.ApprovalInstanceID = &instanceID
	}
	return nil
}

// recordWithdrawalFreezeTransaction 写入提现冻结钱包流水，金额为负且状态为处理中。
func recordWithdrawalFreezeTransaction(
	ctx context.Context,
	tx *gorm.DB,
	wallet *model.AgentWallet,
	request *model.CommissionWithdrawalRequest,
	operatorID uint,
	amount int64,
) (*model.AgentWalletTransaction, error) {
	remark := "提现冻结，单号：" + request.WithdrawalNo
	refType := constants.ReferenceTypeWithdrawal
	refID := request.ID
	transaction := &model.AgentWalletTransaction{
		AgentWalletID: wallet.ID, ShopID: request.ShopID, UserID: operatorID,
		TransactionType: constants.AgentTransactionTypeWithdrawal,
		Amount:          -amount,
		BalanceBefore:   wallet.Balance, BalanceAfter: wallet.Balance - amount,
		Status:        constants.TransactionStatusProcessing,
		ReferenceType: &refType, ReferenceID: &refID, Remark: &remark,
		Creator: operatorID, ShopIDTag: request.ShopID,
	}
	if err := tx.WithContext(ctx).Create(transaction).Error; err != nil {
		return nil, errors.Wrap(errors.CodeDatabaseError, err, "创建提现冻结钱包流水失败")
	}
	return transaction, nil
}

// shopName 读取店铺名称用于审批表单展示，缺失时留空。
func shopName(ctx context.Context, db *gorm.DB, shopID uint) string {
	var shop model.Shop
	if err := db.WithContext(ctx).Select("id", "shop_name").First(&shop, shopID).Error; err != nil {
		return ""
	}
	return shop.ShopName
}

// withdrawalApprovalForm 生成企业微信审批表单业务快照。
// 收款账号按原值写入供审批人核验，其他敏感内容不写入。
func withdrawalApprovalForm(
	request *model.CommissionWithdrawalRequest,
	attempt *model.CommissionWithdrawalRequestAttempt,
	shopNameValue string,
) map[string]any {
	accountName, accountNumber := decodeAccountInfo(attempt.AccountInfo)
	return map[string]any{
		constants.ApprovalFieldWithdrawalNo:            request.WithdrawalNo,
		constants.ApprovalFieldWithdrawalAttemptNo:     attempt.AttemptNo,
		constants.ApprovalFieldWithdrawalShopID:        request.ShopID,
		constants.ApprovalFieldWithdrawalShopName:      shopNameValue,
		constants.ApprovalFieldWithdrawalAmount:        formatAmountYuan(attempt.Amount),
		constants.ApprovalFieldWithdrawalAmountCent:    attempt.Amount,
		constants.ApprovalFieldWithdrawalFee:           formatAmountYuan(attempt.Fee),
		constants.ApprovalFieldWithdrawalActualAmount:  formatAmountYuan(attempt.ActualAmount),
		constants.ApprovalFieldWithdrawalMethod:        attempt.WithdrawalMethod,
		constants.ApprovalFieldWithdrawalAccountName:   accountName,
		constants.ApprovalFieldWithdrawalAccountNumber: accountNumber,
		constants.ApprovalFieldWithdrawalInvoiceKey:    decodeInvoiceKeys(attempt.InvoiceKeys),
	}
}

// decodeAccountInfo 解析收款账户信息快照，解析失败时留空。
func decodeAccountInfo(payload []byte) (string, string) {
	var info map[string]string
	if err := sonic.Unmarshal(payload, &info); err != nil {
		return "", ""
	}
	return info["account_name"], info["account_number"]
}

// decodeInvoiceKeys 解析发票对象键列表，解析失败时返回空列表。
func decodeInvoiceKeys(payload []byte) []string {
	var keys []string
	if err := sonic.Unmarshal(payload, &keys); err != nil {
		return []string{}
	}
	return keys
}

// withdrawalAuditSnapshot 生成提现审计快照，不含收款账号与发票内容。
func withdrawalAuditSnapshot(
	request *model.CommissionWithdrawalRequest,
	attempt *model.CommissionWithdrawalRequestAttempt,
	wallet *model.AgentWallet,
) map[string]any {
	snapshot := map[string]any{
		"id": request.ID, "withdrawal_no": request.WithdrawalNo, "shop_id": request.ShopID,
		"amount": attempt.Amount, "fee": attempt.Fee, "fee_rate": attempt.FeeRate,
		"actual_amount": attempt.ActualAmount, "withdrawal_method": attempt.WithdrawalMethod,
		"status": request.Status, "attempt_id": attempt.ID, "attempt_no": attempt.AttemptNo,
		"latest_approval_instance_id": request.LatestApprovalInstanceID,
		"anomaly_flag":                request.AnomalyFlag,
		"invoice_count":               len(decodeInvoiceKeys(attempt.InvoiceKeys)),
	}
	if wallet != nil {
		snapshot["wallet_id"] = wallet.ID
		snapshot["wallet_frozen_balance"] = wallet.FrozenBalance
	}
	return snapshot
}

// withdrawalSubmitSummary 区分首次提交与重提的审计摘要。
func withdrawalSubmitSummary(resubmit bool) string {
	if resubmit {
		return "重提佣金提现申请，已释放旧未结算冻结"
	}
	return "提交佣金提现申请并冻结可提现余额"
}

// ReleaseUnsettledAttemptsInTx 幂等释放指定店铺全部未结算的提现审批尝试冻结。
// 释放金额取 try.amount 事实，释放完成写入 released_at；已释放的尝试不会被重复释放。
// 供后续佣金回溯在扣减佣金余额前先释放冻结，返回本次实际释放金额合计。
func (s *WithdrawalService) ReleaseUnsettledAttemptsInTx(
	ctx context.Context,
	tx *gorm.DB,
	shopID uint,
) (int64, error) {
	if s == nil || s.db == nil || tx == nil || shopID == 0 {
		return 0, errors.New(errors.CodeInvalidParam, "提现冻结释放参数无效")
	}
	return releaseUnsettledAttempts(ctx, tx, shopID)
}

// releaseUnsettledAttemptsForRequest 在重提事务内释放指定申请的全部未结算尝试冻结。
func releaseUnsettledAttemptsForRequest(
	ctx context.Context,
	tx *gorm.DB,
	requestID uint,
) (int64, error) {
	return releaseUnsettledForRequests(ctx, tx, []uint{requestID})
}

// releaseUnsettledAttempts 释放指定店铺范围内未结算的提现审批尝试冻结。
// 全局加锁顺序固定为「申请 → 尝试 → 钱包」：本函数先锁申请行，再交由释放原语锁尝试行。
func releaseUnsettledAttempts(
	ctx context.Context,
	tx *gorm.DB,
	shopID uint,
) (int64, error) {
	var requestIDs []uint
	if err := tx.WithContext(ctx).Model(&model.CommissionWithdrawalRequest{}).
		Where("shop_id = ?", shopID).Order("id ASC").Pluck("id", &requestIDs).Error; err != nil {
		return 0, errors.Wrap(errors.CodeDatabaseError, err, "查询店铺提现申请失败")
	}
	return releaseUnsettledForRequests(ctx, tx, requestIDs)
}

// releaseUnsettledForRequests 通过共享释放原语释放尝试冻结并解冻钱包。
// 释放金额一律取尝试记录事实；原语的 released_at 条件更新保证重复调用不重复释放。
func releaseUnsettledForRequests(
	ctx context.Context,
	tx *gorm.DB,
	requestIDs []uint,
) (int64, error) {
	if len(requestIDs) == 0 {
		return 0, nil
	}
	requests := make(map[uint]*model.CommissionWithdrawalRequest, len(requestIDs))
	for _, requestID := range requestIDs {
		request, err := lockWithdrawalRequest(ctx, tx, requestID)
		if err != nil {
			return 0, err
		}
		requests[requestID] = request
	}
	now := time.Now().UTC()
	amounts, err := postgres.ReleaseUnsettledForRequestsInTx(ctx, tx, requestIDs, now)
	if err != nil {
		return 0, err
	}
	total := int64(0)
	for _, requestID := range requestIDs {
		amount, exists := amounts[requestID]
		if !exists || amount == 0 {
			continue
		}
		request := requests[requestID]
		wallet, err := lockCommissionWallet(ctx, tx, request.ShopID)
		if err != nil {
			return 0, err
		}
		ok, err := releaseCommissionBalance(ctx, tx, wallet.ID, amount)
		if err != nil {
			return 0, err
		}
		if !ok {
			return 0, errors.New(errors.CodeConflict, "提现冻结余额与尝试记录不一致，请人工核对")
		}
		total += amount
	}
	return total, nil
}

// generateWithdrawalNo 生成提现单号，格式：W + 时间戳 + 随机数。
func generateWithdrawalNo() string {
	return "W" + time.Now().Format("20060102150405") + randomDigits(6)
}

// randomDigits 生成指定位数的数字随机串，用于提现单号。
func randomDigits(length int) string {
	const digits = "0123456789"
	buf := make([]byte, 0, length)
	limit := big.NewInt(int64(len(digits)))
	for range length {
		value, err := rand.Int(rand.Reader, limit)
		if err != nil {
			return strings.Repeat("0", length)
		}
		buf = append(buf, digits[value.Int64()])
	}
	return string(buf)
}

// formatAmountYuan 将分金额格式化为元字符串，仅用于展示与审批表单。
func formatAmountYuan(amount int64) string {
	negative := amount < 0
	if negative {
		amount = -amount
	}
	value := distributiondomain.FormatCentYuan(amount)
	if negative {
		return "-" + value
	}
	return value
}