package model

import (
	"context"
	"git.noahlan.cn/northlan/ntools-go/gorm-zero/gormx"
	"github.com/pkg/errors"
	"gorm.io/gorm"
	"gorm.io/plugin/optimisticlock"
	"live-service/common/nerr"
)

var _ UserCoinModel = (*customUserCoinModel)(nil)

type (
	// UserCoinModel is an interface to be customized, add more methods here,
	// and implement the added methods in customUserCoinModel.
	UserCoinModel interface {
		userCoinModel
		// ChangeCoin 用户弹币变动
		ChangeCoin(ctx context.Context, tx *gorm.DB, userId int64, change int64) (int64, error)
	}

	customUserCoinModel struct {
		*defaultUserCoinModel
	}
)

// NewUserCoinModel returns a model for the database table.
func NewUserCoinModel(conn *gorm.DB) UserCoinModel {
	return &customUserCoinModel{
		defaultUserCoinModel: newUserCoinModel(conn),
	}
}

func (m *customUserCoinModel) updateCoin(ctx context.Context, tx *gorm.DB, coin *UserCoin) error {
	if coin.Coin < 0 {
		return errors.New("无法将弹币更新至负数")
	}
	db := gormx.WithTx(ctx, m.DB, tx)

	result := db.Model(&coin).Updates(&UserCoin{Coin: coin.Coin, Version: optimisticlock.Version{Int64: 1}})
	return gormx.WrapUpdateErr(result.Error, result.RowsAffected)
}

func (m *customUserCoinModel) ChangeCoin(ctx context.Context, tx *gorm.DB, userId int64, change int64) (int64, error) {
	resp := change
	err := gormx.WithRetry(VersionRetryCount, func() error {
		return m.Transact(tx, func(tx *gorm.DB) error {
			data, err := m.FindOne(ctx, tx, userId)
			if err != nil {
				if errors.Is(err, ErrNotFound) {
					if change < 0 {
						return nerr.NewError(nerr.UserCoinNotEnoughErr, "用户弹币不足")
					}
					// 用户积分记录不存在,进行插入
					if err = m.Insert(ctx, tx, &UserCoin{
						UserId: userId,
						Coin:   change,
					}); err != nil {
						return nerr.NewError(nerr.NewUserCoinErr, "新建用户弹币记录失败")
					}
					return nil
				} else {
					return nerr.NewError(nerr.GetUserCoinErr, "获取当前用户弹币失败")
				}
			}
			if data.Coin+change < 0 {
				return nerr.NewError(nerr.UserCoinNotEnoughErr, "用户弹币不足")
			}
			data.Coin += change
			if err = m.updateCoin(ctx, tx, data); err != nil {
				if errors.Is(err, gormx.ErrRowsAffectedZero) {
					return err
				}
				return nerr.NewError(nerr.UpdateUserCoinErr, "更新用户弹币失败")
			}
			resp = data.Coin
			return nil
		})
	}, func(err error) bool {
		return errors.Is(err, gormx.ErrRowsAffectedZero)
	})
	return resp, err
}