package services

import (
	"fmt"
	"platform/web/core"
	m "platform/web/models"
	q "platform/web/queries"

	"github.com/shopspring/decimal"
)

var User = &userService{}

type userService struct{}

func (s *userService) Get(q *q.Query, uid int32) (*m.User, error) {
	user, err := q.User.
		Where(q.User.ID.Eq(uid)).Take()
	if err != nil {
		return nil, core.NewServErr("查询用户失败", err)
	}
	return user, nil
}

func (s *userService) UpdateBalance(q *q.Query, user *m.User, amount decimal.Decimal) error {
	balance := user.Balance.Add(amount)
	if balance.IsNegative() {
		return core.NewServErr("用户余额不足")
	}

	_, err := q.User.
		Where(
			q.User.ID.Eq(user.ID),
			q.User.Balance.Eq(user.Balance),
		).
		UpdateSimple(
			q.User.Balance.Value(balance),
		)
	if err != nil {
		return core.NewServErr("更新用户余额失败", err)
	}

	return nil
}

func userBalanceKey(uid int32) string {
	return fmt.Sprintf("user:%d:balance", uid)
}

type UpdateBalanceData struct {
	Amount int `json:"amount"`
}

func (data *UpdateBalanceData) TradeDetail(user *m.User) (*TradeDetail, error) {
	amount := decimal.NewFromInt(int64(data.Amount)).Div(decimal.NewFromInt(100))
	return &TradeDetail{
		data,
		m.TradeTypeRecharge,
		fmt.Sprintf("账户充值 - %s元", amount.StringFixed(2)),
		amount, amount,
		nil, nil,
		nil, nil,
	}, nil
}