package basic

import (
	"context"
	"time"

	"bsm/full/module/finance/wallet/internal/excode"
	"bsm/full/module/finance/wallet/internal/impl"
	"bsm/full/module/finance/wallet/internal/models"
	pb "bsm/full/module/finance/wallet/pb"
	"git.apinb.com/bsm-sdk/core/errcode"
	"git.apinb.com/bsm-sdk/core/printer"
	"git.apinb.com/bsm-sdk/core/service"
	"git.apinb.com/bsm-sdk/core/utils"
	"git.apinb.com/bsm-sdk/core/vars"
	"gorm.io/gorm"
)

// 申请提现
// 在同一事务内先原子扣减余额/可提现余额，再写入提现单与流水，
// 并通过条件更新（balance >= amount）保证余额不足时不会生成提现单，避免重复提交超额提现。
func ApplyCash(ctx context.Context, in *pb.ApplyCashRequest) (reply *pb.StatusReply, err error) {
	auth, ok := service.ParseMetaCtx(ctx, nil)
	if ok != nil {
		return nil, ok
	}

	if in.Amount <= 0 || in.Channel == 0 {
		return nil, errcode.ErrInvalidArgument
	}
	// 提现渠道仅支持 1:微信 2:支付宝 3:银行卡
	if in.Channel != 1 && in.Channel != 2 && in.Channel != 3 {
		return nil, excode.ErrPayChannel
	}

	myWallet, err := models.GetWalletByPassportIdentity(auth.ID, auth.Identity)
	if err != nil {
		printer.Error(err.Error())
		return nil, errcode.ErrDB
	}

	// cashNo 同时作为提现单幂等键与内部流水号
	cashNo := utils.UUID()

	err = impl.DBService.Transaction(func(tx *gorm.DB) error {
		// 条件更新：余额与可提现余额均充足且钱包未禁用时才扣减
		res := tx.Model(&models.WalletBasic{}).
			Where("identity = ? AND status <> -1 AND balance >= ? AND withdrawal_balance >= ?", myWallet.Identity, in.Amount, in.Amount).
			UpdateColumns(map[string]interface{}{
				"balance":            gorm.Expr("balance - ?", in.Amount),
				"withdrawal_balance": gorm.Expr("withdrawal_balance - ?", in.Amount),
			})
		if res.Error != nil {
			return res.Error
		}
		if res.RowsAffected == 0 {
			return excode.ErrBalanceNotEnough
		}

		// 生成提现单
		data := &models.WalletApplyCash{
			WalletIdentity: myWallet.Identity,
			CashNo:         cashNo,
			Amount:         in.Amount,
			Channel:        int8(in.Channel),
			Remark:         in.Remark,
		}
		data.Identity = utils.UUID()
		data.PassportID = auth.ID
		data.PassportIdentity = auth.Identity
		if err := tx.Create(data).Error; err != nil {
			return err
		}

		// 同一事务内写入提现流水
		record := &models.WalletRecord{
			WalletIdentity: myWallet.Identity,
			TransType:      -1,     // 支出
			InTradeNo:      cashNo, // 内部流水号
			Money:          in.Amount,
			TradeType:      2, // 提现
			PayChannel:     int8(in.Channel),
			PayType:        "CASH", // 提现
			Remark:         in.Remark,
		}
		record.Identity = utils.UUID()
		record.PassportID = auth.ID
		record.PassportIdentity = auth.Identity
		models.FillRecordYmd(record)
		return tx.Create(record).Error
	})
	if err != nil {
		if err == excode.ErrBalanceNotEnough {
			return nil, excode.ErrBalanceNotEnough
		}
		printer.Error(err.Error())
		return nil, errcode.ErrDB
	}

	return &pb.StatusReply{
		Message: vars.OK,
		Timeseq: time.Now().UnixMilli(),
	}, nil
}