package mysqldao

import (
	"context"

	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/global"
	"git.lzcwy.cn/zhengchiliu/zt-closet-backend/internal/mysqlmodel"
	"gorm.io/gorm"
	"gorm.io/gorm/clause"
)

// QuotaDao 用户配额数据访问
type QuotaDao struct {
	db *gorm.DB
}

// NewQuotaDao 创建配额 DAO
func NewQuotaDao() *QuotaDao {
	return &QuotaDao{db: global.MysqlEngine}
}

// QuotaCreate 创建配额记录
func (d *QuotaDao) QuotaCreate(ctx context.Context, quota *mysqlmodel.Quota) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaCreate")
	defer span.End()

	if err := d.db.WithContext(ctx).Create(quota).Error; err != nil {
		span.RecordError(err)
		return err
	}
	return nil
}

// QuotaIncreaseUsed 原子增加已用量（扣减配额），剩余不足时返回 false。
// 已废弃：仅改数值不写流水，存在账实不符风险；新代码请使用 QuotaConsumeWithFlow。
func (d *QuotaDao) QuotaIncreaseUsed(ctx context.Context, userID int64, quotaType int8, n int64) (bool, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaIncreaseUsed")
	defer span.End()

	res := d.db.WithContext(ctx).Model(&mysqlmodel.Quota{}).
		Where("user_id = ? AND quota_type = ? AND used + ? <= total", userID, quotaType, n).
		UpdateColumn("used", gorm.Expr("used + ?", n))
	if res.Error != nil {
		span.RecordError(res.Error)
		return false, res.Error
	}
	return res.RowsAffected > 0, nil
}

// QuotaDecreaseUsed 原子减少已用量（回退配额），已用量不足时返回 false。
// 已废弃：仅改数值不写流水，存在账实不符风险；新代码请使用 QuotaRefundWithFlow。
func (d *QuotaDao) QuotaDecreaseUsed(ctx context.Context, userID int64, quotaType int8, n int64) (bool, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaDecreaseUsed")
	defer span.End()

	res := d.db.WithContext(ctx).Model(&mysqlmodel.Quota{}).
		Where("user_id = ? AND quota_type = ? AND used >= ?", userID, quotaType, n).
		UpdateColumn("used", gorm.Expr("used - ?", n))
	if res.Error != nil {
		span.RecordError(res.Error)
		return false, res.Error
	}
	return res.RowsAffected > 0, nil
}

// QuotaConsumeWithFlow 事务内扣减配额并写流水，保证数值变更与流水强一致。
// 条件更新不满足（额度不足）返回 (false, nil)；其余错误（含流水写入失败整体回滚）返回 error。
func (d *QuotaDao) QuotaConsumeWithFlow(ctx context.Context, userID int64, quotaType int8, n int64, flow *mysqlmodel.QuotaFlowLog) (bool, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaConsumeWithFlow")
	defer span.End()

	var ok bool
	err := d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		res := tx.Model(&mysqlmodel.Quota{}).
			Where("user_id = ? AND quota_type = ? AND used + ? <= total", userID, quotaType, n).
			UpdateColumn("used", gorm.Expr("used + ?", n))
		if res.Error != nil {
			return res.Error
		}
		if res.RowsAffected == 0 {
			return nil // 额度不足，无变更。
		}
		ok = true

		// 回读真实值填充流水 old/new。
		var cur mysqlmodel.Quota
		if err := tx.Where("user_id = ? AND quota_type = ?", userID, quotaType).First(&cur).Error; err != nil {
			return err
		}
		remain := cur.Total - cur.Used
		flow.OldValue = remain + n
		flow.NewValue = remain

		// 写流水（失败则整个事务回滚，扣减一并撤销）。
		ensureFlowOrderNo(flow)
		return tx.Create(flow).Error
	})
	if err != nil {
		span.RecordError(err)
		return false, err
	}
	return ok, nil
}

// QuotaRefundWithFlow 事务内回退配额并写流水，保证数值变更与流水强一致。
// 条件更新不满足（已用量不足/重复回退）返回 (false, nil)；其余错误（含流水失败回滚）返回 error。
func (d *QuotaDao) QuotaRefundWithFlow(ctx context.Context, userID int64, quotaType int8, n int64, flow *mysqlmodel.QuotaFlowLog) (bool, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaRefundWithFlow")
	defer span.End()

	var ok bool
	err := d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		res := tx.Model(&mysqlmodel.Quota{}).
			Where("user_id = ? AND quota_type = ? AND used >= ?", userID, quotaType, n).
			UpdateColumn("used", gorm.Expr("used - ?", n))
		if res.Error != nil {
			return res.Error
		}
		if res.RowsAffected == 0 {
			return nil // 已用量不足，无变更。
		}
		ok = true

		// 回读真实值填充流水 old/new。
		var cur mysqlmodel.Quota
		if err := tx.Where("user_id = ? AND quota_type = ?", userID, quotaType).First(&cur).Error; err != nil {
			return err
		}
		remain := cur.Total - cur.Used
		flow.OldValue = remain - n
		flow.NewValue = remain

		// 写流水（失败则整个事务回滚，回退一并撤销）。
		ensureFlowOrderNo(flow)
		return tx.Create(flow).Error
	})
	if err != nil {
		span.RecordError(err)
		return false, err
	}
	return ok, nil
}

// QuotaInitWithFlow 事务内初始化配额并写流水。
// 依赖 uk_user_quota 唯一索引（OnConflict DoNothing）实现并发安全幂等：已存在则跳过且不写流水。
func (d *QuotaDao) QuotaInitWithFlow(ctx context.Context, userID int64, quotaType int8, total int64, flow *mysqlmodel.QuotaFlowLog) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaInitWithFlow")
	defer span.End()

	return d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		q := &mysqlmodel.Quota{
			UserID:    userID,
			QuotaType: quotaType,
			Total:     total,
			Used:      0,
		}
		res := tx.Clauses(clause.OnConflict{
			Columns:   []clause.Column{{Name: "user_id"}, {Name: "quota_type"}},
			DoNothing: true,
		}).Create(q)
		if res.Error != nil {
			return res.Error
		}
		if res.RowsAffected == 0 {
			return nil // 已存在，幂等跳过。
		}

		// 回读真实值填充流水 old/new。
		var cur mysqlmodel.Quota
		if err := tx.Where("user_id = ? AND quota_type = ?", userID, quotaType).First(&cur).Error; err != nil {
			return err
		}
		remain := cur.Total - cur.Used
		flow.OldValue = remain - total
		flow.NewValue = remain

		// 写流水（失败则整个事务回滚，初始化一并撤销）。
		ensureFlowOrderNo(flow)
		return tx.Create(flow).Error
	})
}

// ensureFlowOrderNo 流水联合唯一索引 (order_no, quota_type, change_type) 的兜底：
// 消费/回退/初始化流水无业务订单号时（order_no 为空串），MySQL 唯一索引将空串视为相同值，
// 第二条同类流水会 1062 冲突。此处用流水自身 UUID 填充 order_no 保证唯一，不影响
// 购买/退款类幂等流水（其 order_no 非空，直接沿用业务订单号）。
func ensureFlowOrderNo(flow *mysqlmodel.QuotaFlowLog) {
	if flow != nil && flow.OrderNo == "" {
		flow.OrderNo = flow.QuotaFlowUUID
	}
}

// QuotaGrantIdempotent 幂等发放额度：事务内先累加 total（不存在则创建，存在则累加），
// 回读真实值后写流水；流水唯一索引（order_no+quota_type+change_type）冲突时事务回滚，
// 调用方据此识别为「已发放」从而幂等。
func (d *QuotaDao) QuotaGrantIdempotent(ctx context.Context, userID int64, quotaType int8, n int64, flow *mysqlmodel.QuotaFlowLog) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaGrantIdempotent")
	defer span.End()

	return d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		// 1. 累加 total（记录不存在则创建，存在则原子累加）。
		q := &mysqlmodel.Quota{
			UserID:    userID,
			QuotaType: quotaType,
			Total:     n,
			Used:      0,
		}
		if err := tx.Clauses(clause.OnConflict{
			Columns:   []clause.Column{{Name: "user_id"}, {Name: "quota_type"}},
			DoUpdates: clause.Assignments(map[string]interface{}{"total": gorm.Expr("total + ?", n)}),
		}).Create(q).Error; err != nil {
			return err
		}

		// 2. 回读真实值填充流水 old/new。
		var cur mysqlmodel.Quota
		if err := tx.Where("user_id = ? AND quota_type = ?", userID, quotaType).First(&cur).Error; err != nil {
			return err
		}
		remain := cur.Total - cur.Used
		flow.OldValue = remain - n
		flow.NewValue = remain

		// 3. 写流水（唯一索引冲突会回滚整个事务，保证不重复发放）。
		return tx.Create(flow).Error
	})
}

// QuotaRevokeIdempotent 幂等回退额度（退款回收）：事务内先扣减 total（GREATEST 保证 total 不低于 used，
// 即已用部分不回退），回读真实值后写回退流水；流水唯一索引（order_no+quota_type+change_type）冲突时
// 事务回滚，调用方据此识别为「已回退」从而幂等。
func (d *QuotaDao) QuotaRevokeIdempotent(ctx context.Context, userID int64, quotaType int8, n int64, flow *mysqlmodel.QuotaFlowLog) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaRevokeIdempotent")
	defer span.End()

	return d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		// 1. 扣减 total（GREATEST(used, total - n) 保证 total >= used）。
		res := tx.Model(&mysqlmodel.Quota{}).
			Where("user_id = ? AND quota_type = ?", userID, quotaType).
			UpdateColumn("total", gorm.Expr("GREATEST(used, total - ?)", n))
		if res.Error != nil {
			return res.Error
		}

		// 2. 回读真实值填充流水 old/new。
		var cur mysqlmodel.Quota
		if err := tx.Where("user_id = ? AND quota_type = ?", userID, quotaType).First(&cur).Error; err != nil {
			return err
		}
		remain := cur.Total - cur.Used
		flow.OldValue = remain + n
		flow.NewValue = remain

		// 3. 写回退流水（唯一索引冲突回滚整个事务，保证不重复回退）。
		return tx.Create(flow).Error
	})
}

// QuotaGetByUserIDAndType 查询用户某类配额
func (d *QuotaDao) QuotaGetByUserIDAndType(ctx context.Context, userID int64, quotaType int8) (*mysqlmodel.Quota, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaGetByUserIDAndType")
	defer span.End()

	var quota mysqlmodel.Quota
	if err := d.db.WithContext(ctx).Where("user_id = ? AND quota_type = ?", userID, quotaType).First(&quota).Error; err != nil {
		span.RecordError(err)
		return nil, err
	}
	return &quota, nil
}

// QuotaListByUserID 查询用户的所有配额
func (d *QuotaDao) QuotaListByUserID(ctx context.Context, userID int64) ([]mysqlmodel.Quota, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaListByUserID")
	defer span.End()

	var quotas []mysqlmodel.Quota
	if err := d.db.WithContext(ctx).Where("user_id = ?", userID).Find(&quotas).Error; err != nil {
		span.RecordError(err)
		return nil, err
	}
	return quotas, nil
}

// UserDailyUsageDao 每日使用计数数据访问
type UserDailyUsageDao struct {
	db *gorm.DB
}

// NewUserDailyUsageDao 创建每日使用计数 DAO
func NewUserDailyUsageDao() *UserDailyUsageDao {
	return &UserDailyUsageDao{db: global.MysqlEngine}
}

// UserDailyUsageCreate 创建每日使用计数
func (d *UserDailyUsageDao) UserDailyUsageCreate(ctx context.Context, usage *mysqlmodel.UserDailyUsage) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.UserDailyUsageCreate")
	defer span.End()

	if err := d.db.WithContext(ctx).Create(usage).Error; err != nil {
		span.RecordError(err)
		return err
	}
	return nil
}

// UserDailyUsageIncrementAI 当日AI推荐次数 +1
func (d *UserDailyUsageDao) UserDailyUsageIncrementAI(ctx context.Context, userID int64, statDate int64) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.UserDailyUsageIncrementAI")
	defer span.End()

	if err := d.db.WithContext(ctx).Model(&mysqlmodel.UserDailyUsage{}).
		Where("user_id = ? AND stat_date = ?", userID, statDate).
		UpdateColumn("ai_recommend_count", gorm.Expr("ai_recommend_count + ?", 1)).Error; err != nil {
		span.RecordError(err)
		return err
	}
	return nil
}

// UserDailyUsageIncrementOutfitShare 当日社区分享次数 +1
func (d *UserDailyUsageDao) UserDailyUsageIncrementOutfitShare(ctx context.Context, userID int64, statDate int64) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.UserDailyUsageIncrementOutfitShare")
	defer span.End()

	if err := d.db.WithContext(ctx).Model(&mysqlmodel.UserDailyUsage{}).
		Where("user_id = ? AND stat_date = ?", userID, statDate).
		UpdateColumn("outfit_share_count", gorm.Expr("outfit_share_count + ?", 1)).Error; err != nil {
		span.RecordError(err)
		return err
	}
	return nil
}

// UserDailyUsageIncrementClosetShare 当日衣柜分享次数 +1
func (d *UserDailyUsageDao) UserDailyUsageIncrementClosetShare(ctx context.Context, userID int64, statDate int64) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.UserDailyUsageIncrementClosetShare")
	defer span.End()

	if err := d.db.WithContext(ctx).Model(&mysqlmodel.UserDailyUsage{}).
		Where("user_id = ? AND stat_date = ?", userID, statDate).
		UpdateColumn("closet_share_count", gorm.Expr("closet_share_count + ?", 1)).Error; err != nil {
		span.RecordError(err)
		return err
	}
	return nil
}

// UserDailyUsageAdjust 原子调整每日使用量；正数使用 upsert，负数保证不低于 0。
func (d *UserDailyUsageDao) UserDailyUsageAdjust(ctx context.Context, userID, statDate int64, quotaType int8, delta int64) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.UserDailyUsageAdjust")
	defer span.End()
	column := ""
	switch quotaType {
	case 2:
		column = "ai_recommend_count"
	case 3:
		column = "outfit_share_count"
	case 4:
		column = "closet_share_count"
	default:
		return nil
	}
	var err error
	if delta > 0 {
		usage := &mysqlmodel.UserDailyUsage{UserID: userID, StatDate: statDate}
		switch quotaType {
		case 2:
			usage.AIRecommendCount = delta
		case 3:
			usage.OutfitShareCount = delta
		case 4:
			usage.ClosetShareCount = delta
		}
		err = d.db.WithContext(ctx).Clauses(clause.OnConflict{
			Columns:   []clause.Column{{Name: "user_id"}, {Name: "stat_date"}},
			DoUpdates: clause.Assignments(map[string]any{column: gorm.Expr(column+" + ?", delta)}),
		}).Create(usage).Error
	} else if delta < 0 {
		err = d.db.WithContext(ctx).Model(&mysqlmodel.UserDailyUsage{}).
			Where("user_id = ? AND stat_date = ?", userID, statDate).
			UpdateColumn(column, gorm.Expr("GREATEST(0, "+column+" + ?)", delta)).Error
	}
	if err != nil {
		span.RecordError(err)
	}
	return err
}

// UserDailyUsageConsume 以 MySQL 为权威账本原子预占每日额度，避免 Redis 丢键后重复消费。
func (d *UserDailyUsageDao) UserDailyUsageConsume(ctx context.Context, userID, statDate int64, quotaType int8, n, limit int64) (bool, error) {
	column := ""
	switch quotaType {
	case 2:
		column = "ai_recommend_count"
	case 3:
		column = "outfit_share_count"
	case 4:
		column = "closet_share_count"
	default:
		return false, nil
	}
	var consumed bool
	err := d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		usage := &mysqlmodel.UserDailyUsage{UserID: userID, StatDate: statDate}
		if err := tx.Clauses(clause.OnConflict{
			Columns: []clause.Column{{Name: "user_id"}, {Name: "stat_date"}}, DoNothing: true,
		}).Create(usage).Error; err != nil {
			return err
		}
		res := tx.Model(&mysqlmodel.UserDailyUsage{}).
			Where("user_id = ? AND stat_date = ? AND "+column+" + ? <= ?", userID, statDate, n, limit).
			UpdateColumn(column, gorm.Expr(column+" + ?", n))
		if res.Error != nil {
			return res.Error
		}
		consumed = res.RowsAffected > 0
		return nil
	})
	return consumed, err
}

// UserDailyUsageGetByUserIDAndDate 查询用户某日使用计数
func (d *UserDailyUsageDao) UserDailyUsageGetByUserIDAndDate(ctx context.Context, userID int64, statDate int64) (*mysqlmodel.UserDailyUsage, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.UserDailyUsageGetByUserIDAndDate")
	defer span.End()

	var usage mysqlmodel.UserDailyUsage
	if err := d.db.WithContext(ctx).Where("user_id = ? AND stat_date = ?", userID, statDate).First(&usage).Error; err != nil {
		span.RecordError(err)
		return nil, err
	}
	return &usage, nil
}

// QuotaFlowLogDao 配额流水数据访问
type QuotaFlowLogDao struct {
	db *gorm.DB
}

// NewQuotaFlowLogDao 创建配额流水 DAO
func NewQuotaFlowLogDao() *QuotaFlowLogDao {
	return &QuotaFlowLogDao{db: global.MysqlEngine}
}

// QuotaFlowLogCreate 创建配额流水
func (d *QuotaFlowLogDao) QuotaFlowLogCreate(ctx context.Context, log *mysqlmodel.QuotaFlowLog) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaFlowLogCreate")
	defer span.End()

	if err := d.db.WithContext(ctx).Create(log).Error; err != nil {
		span.RecordError(err)
		return err
	}
	return nil
}

// QuotaFlowLogExistsByOrderNoAndType 判断指定订单+额度类型是否已有发放流水（补偿重试幂等判断）。
func (d *QuotaFlowLogDao) QuotaFlowLogExistsByOrderNoAndType(ctx context.Context, orderNo string, quotaType int8) (bool, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaFlowLogExistsByOrderNoAndType")
	defer span.End()

	var count int64
	if err := d.db.WithContext(ctx).Model(&mysqlmodel.QuotaFlowLog{}).
		Where("order_no = ? AND quota_type = ?", orderNo, quotaType).
		Count(&count).Error; err != nil {
		span.RecordError(err)
		return false, err
	}
	return count > 0, nil
}

// QuotaFlowLogListByUserID 分页查询用户配额流水（quotaType 为 0 不筛选）
func (d *QuotaFlowLogDao) QuotaFlowLogListByUserID(ctx context.Context, userID int64, quotaType int8, page, pageSize int) ([]mysqlmodel.QuotaFlowLog, int64, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaFlowLogListByUserID")
	defer span.End()

	var list []mysqlmodel.QuotaFlowLog
	var total int64
	q := d.db.WithContext(ctx).Model(&mysqlmodel.QuotaFlowLog{}).Where("user_id = ?", userID)
	if quotaType != 0 {
		q = q.Where("quota_type = ?", quotaType)
	}
	if err := q.Count(&total).Error; err != nil {
		span.RecordError(err)
		return nil, 0, err
	}
	if err := q.Offset((page - 1) * pageSize).Limit(pageSize).Order("id DESC").Find(&list).Error; err != nil {
		span.RecordError(err)
		return nil, 0, err
	}
	return list, total, nil
}

// QuotaGrantDao 额度凭证数据访问（有有效期赠送额度）。
type QuotaGrantDao struct {
	db *gorm.DB
}

// NewQuotaGrantDao 创建额度凭证 DAO。
func NewQuotaGrantDao() *QuotaGrantDao {
	return &QuotaGrantDao{db: global.MysqlEngine}
}

// QuotaGrantCreateWithFlow 事务内创建额度凭证并写发放流水（购买赠送/活动赠送）。
// 返回值 created 表示本次是否新建了凭证：依赖 uk_grant_ref_type(ref_id, quota_type) 唯一索引实现幂等，
// 凭证已存在时返回 (false, nil) 且不写流水，避免重复回调/补偿重试重复记账
// （流水侧另有 (order_no, quota_type, change_type) 唯一索引兜底）。
func (d *QuotaGrantDao) QuotaGrantCreateWithFlow(ctx context.Context, grant *mysqlmodel.QuotaGrant, flow *mysqlmodel.QuotaFlowLog) (bool, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaGrantCreateWithFlow")
	defer span.End()

	created := false
	err := d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		res := tx.Clauses(clause.OnConflict{
			Columns:   []clause.Column{{Name: "ref_id"}, {Name: "quota_type"}},
			DoNothing: true,
		}).Create(grant)
		if res.Error != nil {
			return res.Error
		}
		if res.RowsAffected == 0 {
			return nil // 凭证已存在：幂等跳过，不重复写流水。
		}
		created = true
		ensureFlowOrderNo(flow)
		return tx.Create(flow).Error
	})
	if err != nil {
		span.RecordError(err)
		return false, err
	}
	return created, nil
}

// AdRewardGrantCreateWithFlow 在用户行锁内执行每日限额、事件幂等、凭证与流水原子写入。
func (d *QuotaGrantDao) AdRewardGrantCreateWithFlow(ctx context.Context, grant *mysqlmodel.QuotaGrant, flow *mysqlmodel.QuotaFlowLog, dayStart, dayEnd int64, maxClaims int) (bool, error) {
	created := false
	err := d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		var user mysqlmodel.User
		if err := tx.Select("id").Clauses(clause.Locking{Strength: "UPDATE"}).Where("id = ?", grant.UserID).First(&user).Error; err != nil {
			return err
		}
		var count int64
		if err := tx.Model(&mysqlmodel.QuotaGrant{}).Where("user_id = ? AND quota_type = ? AND source = ? AND created_at >= ? AND created_at < ?", grant.UserID, grant.QuotaType, grant.Source, dayStart, dayEnd).Count(&count).Error; err != nil {
			return err
		}
		if count >= int64(maxClaims) {
			return nil
		}
		res := tx.Clauses(clause.OnConflict{Columns: []clause.Column{{Name: "ref_id"}, {Name: "quota_type"}}, DoNothing: true}).Create(grant)
		if res.Error != nil || res.RowsAffected == 0 {
			return res.Error
		}
		ensureFlowOrderNo(flow)
		if err := tx.Create(flow).Error; err != nil {
			return err
		}
		created = true
		return nil
	})
	return created, err
}

// QuotaGrantListByUserIDAndType 查询用户某类型全部凭证（未删除）。
// 按到期时间升序（expire_time=0 表示跟随 VIP，排最后），配合「先到期先用」扣减策略。
func (d *QuotaGrantDao) QuotaGrantListByUserIDAndType(ctx context.Context, userID int64, quotaType int8) ([]mysqlmodel.QuotaGrant, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaGrantListByUserIDAndType")
	defer span.End()

	var list []mysqlmodel.QuotaGrant
	if err := d.db.WithContext(ctx).
		Where("user_id = ? AND quota_type = ?", userID, quotaType).
		Order("CASE WHEN expire_time = 0 THEN 1 ELSE 0 END ASC").
		Order("expire_time ASC").
		Find(&list).Error; err != nil {
		span.RecordError(err)
		return nil, err
	}
	return list, nil
}

// QuotaGrantConsume 条件扣减单条凭证已用量（used + n <= amount），返回是否扣减成功。
// 用于 Cos 永久额度凭证维度的扣减，避免并发超扣。
func (d *QuotaGrantDao) QuotaGrantConsume(ctx context.Context, grantID int64, n int64) (bool, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaGrantConsume")
	defer span.End()

	res := d.db.WithContext(ctx).Model(&mysqlmodel.QuotaGrant{}).
		Where("id = ? AND used + ? <= amount", grantID, n).
		UpdateColumn("used", gorm.Expr("used + ?", n))
	if res.Error != nil {
		span.RecordError(res.Error)
		return false, res.Error
	}
	return res.RowsAffected > 0, nil
}

// QuotaGrantListByRefID 查询某关联ID（订单号/广告记录ID）下未删除的额度凭证。
func (d *QuotaGrantDao) QuotaGrantListByRefID(ctx context.Context, refID string) ([]mysqlmodel.QuotaGrant, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaGrantListByRefID")
	defer span.End()

	var list []mysqlmodel.QuotaGrant
	if err := d.db.WithContext(ctx).Where("ref_id = ?", refID).Find(&list).Error; err != nil {
		span.RecordError(err)
		return nil, err
	}
	return list, nil
}

// QuotaGrantInvalidateByRefIDWithFlows 事务内按关联ID软删除凭证，并写「退款回收」流水。
// 凭证软删除后不再计入有效额度；已用部分不追回，故流水变更量由调用方按 (amount - used) 记负数。
// 凭证失效与流水同事务，保证「额度被回收」与「额度明细」一致。
func (d *QuotaGrantDao) QuotaGrantInvalidateByRefIDWithFlows(ctx context.Context, refID string, flows []*mysqlmodel.QuotaFlowLog) error {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaGrantInvalidateByRefIDWithFlows")
	defer span.End()

	return d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		if err := tx.Where("ref_id = ?", refID).Delete(&mysqlmodel.QuotaGrant{}).Error; err != nil {
			return err
		}
		for _, f := range flows {
			ensureFlowOrderNo(f)
			if err := tx.Create(f).Error; err != nil {
				return err
			}
		}
		return nil
	})
}

// QuotaGrantExistsByRefIDAndType 判断凭证是否已存在（广告激励防重复领取）。
func (d *QuotaGrantDao) QuotaGrantExistsByRefIDAndType(ctx context.Context, refID string, quotaType int8) (bool, error) {
	ctx, span := global.Tracer.Start(ctx, "mysqldao.QuotaGrantExistsByRefIDAndType")
	defer span.End()

	var count int64
	if err := d.db.WithContext(ctx).Model(&mysqlmodel.QuotaGrant{}).
		Where("ref_id = ? AND quota_type = ?", refID, quotaType).
		Count(&count).Error; err != nil {
		span.RecordError(err)
		return false, err
	}
	return count > 0, nil
}