package model

import (
	"errors"
	"fmt"
	"strings"

	"github.com/QuantumNous/new-api/common"
	"github.com/QuantumNous/new-api/logger"

	"github.com/shopspring/decimal"
	"gorm.io/gorm"
)

type TopUp struct {
	Id               int     `json:"id"`
	UserId           int     `json:"user_id" gorm:"index"`
	// Username 列表接口填充，关联 users.username，仅 JSON 输出，不参与持久化（不使用 omitempty，便于前端始终拿到字段）
	Username         string  `json:"username" gorm:"-"`
	Amount           int64   `json:"amount"`
	Money            float64 `json:"money"`
	TradeNo          string  `json:"trade_no" gorm:"unique;type:varchar(255);index"`
	PaymentMethod    string  `json:"payment_method" gorm:"type:varchar(50)"`
	CreateTime       int64   `json:"create_time"`
	CompleteTime     int64   `json:"complete_time"`
	Status           string  `json:"status"`
}

func (topUp *TopUp) Insert() error {
	var err error
	err = DB.Create(topUp).Error
	return err
}

func (topUp *TopUp) Update() error {
	var err error
	err = DB.Save(topUp).Error
	return err
}

// fillTopUpUsernamesWithDB 为充值记录批量填充关联用户名（管理员全平台列表与当前用户本人充值列表均使用）。
// 使用独立 Session 避免与同一事务上先查 top_ups 再查 users 时 GORM 语句状态串扰；Unscoped 以包含已软删除用户，保证历史订单仍能显示用户名。
func fillTopUpUsernamesWithDB(db *gorm.DB, topups []*TopUp) error {
	if len(topups) == 0 {
		return nil
	}
	idSet := make(map[int]struct{})
	for _, t := range topups {
		if t != nil && t.UserId > 0 {
			idSet[t.UserId] = struct{}{}
		}
	}
	if len(idSet) == 0 {
		return nil
	}
	ids := make([]int, 0, len(idSet))
	for id := range idSet {
		ids = append(ids, id)
	}
	type idName struct {
		Id       int    `gorm:"column:id"`
		Username string `gorm:"column:username"`
	}
	var rows []idName
	// NewDB: 与 TopUp 查询复用同一 *gorm.DB 时，避免 Statement 残留导致用户表查询异常
	q := db.Session(&gorm.Session{NewDB: true}).Unscoped().Model(&User{}).Select("id", "username").Where("id IN ?", ids)
	if err := q.Scan(&rows).Error; err != nil {
		return err
	}
	nameByID := make(map[int]string, len(rows))
	for i := range rows {
		nameByID[rows[i].Id] = rows[i].Username
	}
	for _, t := range topups {
		if t != nil {
			t.Username = nameByID[t.UserId]
		}
	}
	return nil
}

func GetTopUpById(id int) *TopUp {
	var topUp *TopUp
	var err error
	err = DB.Where("id = ?", id).First(&topUp).Error
	if err != nil {
		return nil
	}
	return topUp
}

func GetTopUpByTradeNo(tradeNo string) *TopUp {
	var topUp *TopUp
	var err error
	err = DB.Where("trade_no = ?", tradeNo).First(&topUp).Error
	if err != nil {
		return nil
	}
	return topUp
}

func Recharge(referenceId string, customerId string) (err error) {
	if referenceId == "" {
		return errors.New("未提供支付单号")
	}

	var quota float64
	topUp := &TopUp{}

	refCol := "`trade_no`"
	if common.UsingPostgreSQL {
		refCol = `"trade_no"`
	}

	err = DB.Transaction(func(tx *gorm.DB) error {
		err := tx.Set("gorm:query_option", "FOR UPDATE").Where(refCol+" = ?", referenceId).First(topUp).Error
		if err != nil {
			return errors.New("充值订单不存在")
		}

		if topUp.Status != common.TopUpStatusPending {
			return errors.New("充值订单状态错误")
		}

		topUp.CompleteTime = common.GetTimestamp()
		topUp.Status = common.TopUpStatusSuccess
		err = tx.Save(topUp).Error
		if err != nil {
			return err
		}

		quota = topUp.Money * common.QuotaPerUnit
		err = tx.Model(&User{}).Where("id = ?", topUp.UserId).Updates(map[string]interface{}{"stripe_customer": customerId, "quota": gorm.Expr("quota + ?", quota)}).Error
		if err != nil {
			return err
		}

		return nil
	})

	if err != nil {
		common.SysError("topup failed: " + err.Error())
		return errors.New("充值失败，请稍后重试")
	}

	RecordLog(topUp.UserId, LogTypeTopup, fmt.Sprintf("使用在线充值成功，充值金额: %v，支付金额：%d", logger.FormatQuota(int(quota)), topUp.Amount))

	ApplyAffiliateTopupReward(topUp.UserId, int(quota))
	return nil
}

// RechargeStripe 按 Stripe 回调完成充值，并在事务中校验渠道、金额和币种。
// 仅当订单为待支付且支付渠道为 stripe、回调金额与订单金额匹配、币种为 USD 时才会入账。
func RechargeStripe(referenceId string, customerId string, paidMoney float64, currency string) (err error) {
	if referenceId == "" {
		return errors.New("未提供支付单号")
	}
	if paidMoney <= 0 {
		return errors.New("无效的支付金额")
	}
	if strings.ToUpper(strings.TrimSpace(currency)) != "USD" {
		return errors.New("不支持的支付币种")
	}

	var quota float64
	topUp := &TopUp{}

	refCol := "`trade_no`"
	if common.UsingPostgreSQL {
		refCol = `"trade_no"`
	}

	err = DB.Transaction(func(tx *gorm.DB) error {
		err := tx.Set("gorm:query_option", "FOR UPDATE").Where(refCol+" = ?", referenceId).First(topUp).Error
		if err != nil {
			return errors.New("充值订单不存在")
		}
		if topUp.Status != common.TopUpStatusPending {
			return errors.New("充值订单状态错误")
		}
		if topUp.PaymentMethod != "stripe" {
			return fmt.Errorf("支付渠道不匹配: expect stripe, got %s", topUp.PaymentMethod)
		}

		expectedMoney := decimal.NewFromFloat(topUp.Money)
		actualMoney := decimal.NewFromFloat(paidMoney)
		diff := expectedMoney.Sub(actualMoney).Abs()
		// 允许 1 美分误差，兼容支付平台与本地浮点换算的微小偏差
		if diff.GreaterThan(decimal.NewFromFloat(0.01)) {
			return fmt.Errorf("支付金额不匹配: expect %s, got %s", expectedMoney.StringFixed(2), actualMoney.StringFixed(2))
		}

		topUp.CompleteTime = common.GetTimestamp()
		topUp.Status = common.TopUpStatusSuccess
		err = tx.Save(topUp).Error
		if err != nil {
			return err
		}

		quota = topUp.Money * common.QuotaPerUnit
		err = tx.Model(&User{}).Where("id = ?", topUp.UserId).Updates(map[string]interface{}{"stripe_customer": customerId, "quota": gorm.Expr("quota + ?", quota)}).Error
		if err != nil {
			return err
		}

		return nil
	})

	if err != nil {
		common.SysError(fmt.Sprintf("stripe topup verify failed, trade_no=%s, currency=%s, paid=%.2f, err=%s", referenceId, strings.ToUpper(strings.TrimSpace(currency)), paidMoney, err.Error()))
		return errors.New("充值失败，请稍后重试")
	}

	RecordLog(topUp.UserId, LogTypeTopup, fmt.Sprintf("使用在线充值成功，充值金额: %v，支付金额：%d", logger.FormatQuota(int(quota)), topUp.Amount))
	ApplyAffiliateTopupReward(topUp.UserId, int(quota))
	return nil
}

// topUpStatusFilterQuery 为充值列表查询追加 status 条件；空字符串或非法值不追加。
func topUpStatusFilterQuery(db *gorm.DB, status string) *gorm.DB {
	s := strings.TrimSpace(strings.ToLower(status))
	if s == "" {
		return db
	}
	switch s {
	case common.TopUpStatusPending, common.TopUpStatusSuccess, common.TopUpStatusFailed, common.TopUpStatusExpired:
		return db.Where("status = ?", s)
	default:
		return db
	}
}

// applyTopUpTradeNoLike 按订单号关键字模糊筛选 trade_no；keyword 为空时不追加条件。
func applyTopUpTradeNoLike(db *gorm.DB, keyword string) *gorm.DB {
	kw := strings.TrimSpace(keyword)
	if kw == "" {
		return db
	}
	like := "%%" + kw + "%%"
	return db.Where("trade_no LIKE ?", like)
}

// applyTopUpUsernameJoin 管理员全平台列表按用户名模糊筛选：INNER JOIN users（避免 IN 子查询在部分驱动下的兼容问题）。
func applyTopUpUsernameJoin(db *gorm.DB, usernameKeyword string) *gorm.DB {
	u := strings.TrimSpace(usernameKeyword)
	if u == "" {
		return db
	}
	like := "%%" + u + "%%"
	return db.Joins("INNER JOIN users ON users.id = top_ups.user_id AND users.username LIKE ?", like)
}

// GetUserTopUps 分页返回指定用户的充值订单；statusFilter、tradeNoKeyword 为空时不对对应维度筛选。
func GetUserTopUps(userId int, pageInfo *common.PageInfo, statusFilter, tradeNoKeyword string) (topups []*TopUp, total int64, err error) {
	// Start transaction
	tx := DB.Begin()
	if tx.Error != nil {
		return nil, 0, tx.Error
	}
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()

	userScope := func(db *gorm.DB) *gorm.DB {
		q := db.Where("user_id = ?", userId)
		q = topUpStatusFilterQuery(q, statusFilter)
		q = applyTopUpTradeNoLike(q, tradeNoKeyword)
		return q
	}

	// Get total count within transaction
	err = tx.Model(&TopUp{}).Scopes(userScope).Count(&total).Error
	if err != nil {
		tx.Rollback()
		return nil, 0, err
	}

	// Get paginated topups within same transaction
	err = tx.Model(&TopUp{}).Scopes(userScope).Order("id desc").Limit(pageInfo.GetPageSize()).Offset(pageInfo.GetStartIdx()).Find(&topups).Error
	if err != nil {
		tx.Rollback()
		return nil, 0, err
	}
	if err = fillTopUpUsernamesWithDB(tx, topups); err != nil {
		tx.Rollback()
		return nil, 0, err
	}

	// Commit transaction
	if err = tx.Commit().Error; err != nil {
		return nil, 0, err
	}

	return topups, total, nil
}

// GetAllTopUps 获取全平台的充值记录（管理员使用）；各筛选为空时不追加对应条件。
func GetAllTopUps(pageInfo *common.PageInfo, statusFilter, tradeNoKeyword, usernameKeyword string) (topups []*TopUp, total int64, err error) {
	tx := DB.Begin()
	if tx.Error != nil {
		return nil, 0, tx.Error
	}
	defer func() {
		if r := recover(); r != nil {
			tx.Rollback()
		}
	}()

	allScope := func(db *gorm.DB) *gorm.DB {
		q := topUpStatusFilterQuery(db, statusFilter)
		q = applyTopUpTradeNoLike(q, tradeNoKeyword)
		q = applyTopUpUsernameJoin(q, usernameKeyword)
		return q
	}

	if err = tx.Model(&TopUp{}).Scopes(allScope).Count(&total).Error; err != nil {
		tx.Rollback()
		return nil, 0, err
	}

	if err = tx.Model(&TopUp{}).Scopes(allScope).Order("id desc").Limit(pageInfo.GetPageSize()).Offset(pageInfo.GetStartIdx()).Find(&topups).Error; err != nil {
		tx.Rollback()
		return nil, 0, err
	}
	if err = fillTopUpUsernamesWithDB(tx, topups); err != nil {
		tx.Rollback()
		return nil, 0, err
	}

	if err = tx.Commit().Error; err != nil {
		return nil, 0, err
	}

	return topups, total, nil
}

// ManualCompleteTopUp 管理员手动完成订单并给用户充值。
// adminUsername 会写入使用日志详情，便于审计是谁执行了补单。
func ManualCompleteTopUp(tradeNo string, adminUsername string) error {
	if tradeNo == "" {
		return errors.New("未提供订单号")
	}

	refCol := "`trade_no`"
	if common.UsingPostgreSQL {
		refCol = `"trade_no"`
	}

	var userId int
	var quotaToAdd int
	var payMoney float64

	err := DB.Transaction(func(tx *gorm.DB) error {
		topUp := &TopUp{}
		// 行级锁，避免并发补单
		if err := tx.Set("gorm:query_option", "FOR UPDATE").Where(refCol+" = ?", tradeNo).First(topUp).Error; err != nil {
			return errors.New("充值订单不存在")
		}

		// 幂等处理：已成功直接返回
		if topUp.Status == common.TopUpStatusSuccess {
			return nil
		}

		if topUp.Status != common.TopUpStatusPending {
			return errors.New("订单状态不是待支付，无法补单")
		}

		// 计算应充值额度：
		// - Stripe 订单：Money 代表经分组倍率换算后的美元数量，直接 * QuotaPerUnit
		// - 其他订单（如易支付）：Amount 为美元数量，* QuotaPerUnit
		if topUp.PaymentMethod == "stripe" {
			dQuotaPerUnit := decimal.NewFromFloat(common.QuotaPerUnit)
			quotaToAdd = int(decimal.NewFromFloat(topUp.Money).Mul(dQuotaPerUnit).IntPart())
		} else {
			dAmount := decimal.NewFromInt(topUp.Amount)
			dQuotaPerUnit := decimal.NewFromFloat(common.QuotaPerUnit)
			quotaToAdd = int(dAmount.Mul(dQuotaPerUnit).IntPart())
		}
		if quotaToAdd <= 0 {
			return errors.New("无效的充值额度")
		}

		// 标记完成
		topUp.CompleteTime = common.GetTimestamp()
		topUp.Status = common.TopUpStatusSuccess
		if err := tx.Save(topUp).Error; err != nil {
			return err
		}

		// 增加用户额度（立即写库，保持一致性）
		if err := tx.Model(&User{}).Where("id = ?", topUp.UserId).Update("quota", gorm.Expr("quota + ?", quotaToAdd)).Error; err != nil {
			return err
		}

		userId = topUp.UserId
		payMoney = topUp.Money
		return nil
	})

	if err != nil {
		return err
	}

	// 事务外记录日志，避免阻塞
	if userId > 0 && quotaToAdd > 0 {
		operatorPrefix := "管理员"
		if adminUsername != "" {
			operatorPrefix = adminUsername
		}
		RecordLog(userId, LogTypeTopup, fmt.Sprintf("%s管理员补单成功，充值金额: %v，支付金额：%f", operatorPrefix, logger.FormatQuota(quotaToAdd), payMoney))
		ApplyAffiliateTopupReward(userId, quotaToAdd)
	}
	return nil
}
func RechargeCreem(referenceId string, customerEmail string, customerName string) (err error) {
	if referenceId == "" {
		return errors.New("未提供支付单号")
	}

	var quota int64
	topUp := &TopUp{}

	refCol := "`trade_no`"
	if common.UsingPostgreSQL {
		refCol = `"trade_no"`
	}

	err = DB.Transaction(func(tx *gorm.DB) error {
		err := tx.Set("gorm:query_option", "FOR UPDATE").Where(refCol+" = ?", referenceId).First(topUp).Error
		if err != nil {
			return errors.New("充值订单不存在")
		}

		if topUp.Status != common.TopUpStatusPending {
			return errors.New("充值订单状态错误")
		}

		topUp.CompleteTime = common.GetTimestamp()
		topUp.Status = common.TopUpStatusSuccess
		err = tx.Save(topUp).Error
		if err != nil {
			return err
		}

		// Creem 直接使用 Amount 作为充值额度（整数）
		quota = topUp.Amount

		// 构建更新字段，优先使用邮箱，如果邮箱为空则使用用户名
		updateFields := map[string]interface{}{
			"quota": gorm.Expr("quota + ?", quota),
		}

		// 如果有客户邮箱，尝试更新用户邮箱（仅当用户邮箱为空时）
		if customerEmail != "" {
			// 先检查用户当前邮箱是否为空
			var user User
			err = tx.Where("id = ?", topUp.UserId).First(&user).Error
			if err != nil {
				return err
			}

			// 如果用户邮箱为空，则更新为支付时使用的邮箱
			if user.Email == "" {
				updateFields["email"] = customerEmail
			}
		}

		err = tx.Model(&User{}).Where("id = ?", topUp.UserId).Updates(updateFields).Error
		if err != nil {
			return err
		}

		return nil
	})

	if err != nil {
		common.SysError("creem topup failed: " + err.Error())
		return errors.New("充值失败，请稍后重试")
	}

	RecordLog(topUp.UserId, LogTypeTopup, fmt.Sprintf("使用Creem充值成功，充值额度: %v，支付金额：%.2f", quota, topUp.Money))

	ApplyAffiliateTopupReward(topUp.UserId, int(quota))
	return nil
}

func RechargeWaffo(tradeNo string) (err error) {
	if tradeNo == "" {
		return errors.New("未提供支付单号")
	}

	var quotaToAdd int
	topUp := &TopUp{}

	refCol := "`trade_no`"
	if common.UsingPostgreSQL {
		refCol = `"trade_no"`
	}

	err = DB.Transaction(func(tx *gorm.DB) error {
		err := tx.Set("gorm:query_option", "FOR UPDATE").Where(refCol+" = ?", tradeNo).First(topUp).Error
		if err != nil {
			return errors.New("充值订单不存在")
		}

		if topUp.Status == common.TopUpStatusSuccess {
			return nil // 幂等：已成功直接返回
		}

		if topUp.Status != common.TopUpStatusPending {
			return errors.New("充值订单状态错误")
		}

		dAmount := decimal.NewFromInt(topUp.Amount)
		dQuotaPerUnit := decimal.NewFromFloat(common.QuotaPerUnit)
		quotaToAdd = int(dAmount.Mul(dQuotaPerUnit).IntPart())
		if quotaToAdd <= 0 {
			return errors.New("无效的充值额度")
		}

		topUp.CompleteTime = common.GetTimestamp()
		topUp.Status = common.TopUpStatusSuccess
		if err := tx.Save(topUp).Error; err != nil {
			return err
		}

		if err := tx.Model(&User{}).Where("id = ?", topUp.UserId).Update("quota", gorm.Expr("quota + ?", quotaToAdd)).Error; err != nil {
			return err
		}

		return nil
	})

	if err != nil {
		common.SysError("waffo topup failed: " + err.Error())
		return errors.New("充值失败，请稍后重试")
	}

	if quotaToAdd > 0 {
		RecordLog(topUp.UserId, LogTypeTopup, fmt.Sprintf("Waffo充值成功，充值额度: %v，支付金额: %.2f", logger.FormatQuota(quotaToAdd), topUp.Money))
		ApplyAffiliateTopupReward(topUp.UserId, quotaToAdd)
	}

	return nil
}