package services

import (
	"errors"
	"fmt"
	"platform/pkg/u"
	"platform/web/core"
	m "platform/web/models"
	q "platform/web/queries"
	"time"

	"github.com/shopspring/decimal"
	"golang.org/x/crypto/bcrypt"
	"gorm.io/gen/field"
	"gorm.io/gorm"
)

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) UpdateBalanceByAdmin(user *m.User, newBalance decimal.Decimal, adminId *int32) error {
	if user == nil {
		return core.NewServErr("用户不存在")
	}

	amount := newBalance.Sub(user.Balance)
	if amount.IsZero() {
		return nil
	}

	return q.Q.Transaction(func(q *q.Query) error {
		return s.UpdateBalance(q, user, amount, "管理员修改余额", adminId, nil)
	})
}

func (s *userService) UpdateBalance(q *q.Query, user *m.User, amount decimal.Decimal, remark string, adminId *int32, billId *int32) error {
	balance := user.Balance.Add(amount)
	if balance.IsNegative() {
		return core.NewServErr("用户余额不足")
	}

	// 更新余额
	_, 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)
	}

	// 新增动账记录
	err = q.BalanceActivity.Create(&m.BalanceActivity{
		UserID:      user.ID,
		AdminID:     adminId,
		BillID:      billId,
		Amount:      amount.StringFixed(2),
		BalancePrev: user.Balance.StringFixed(2),
		BalanceCurr: balance.StringFixed(2),
		Remark:      &remark,
	})
	if err != nil {
		return core.NewServErr("新增动账记录失败", 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, amount,
		nil, nil,
	}, nil
}

// CreateByAdmin 管理员创建用户的数据
func (s *userService) CreateByAdmin(data CreateUserByAdminData) error {
	var hashedPwd *string
	if data.Password != nil {
		hash, err := bcrypt.GenerateFromPassword([]byte(*data.Password), bcrypt.DefaultCost)
		if err != nil {
			return core.NewServErr("密码加密失败", err)
		}
		hashedPwd = u.P(string(hash))
	}

	source := m.UserSourceAdd
	err := q.User.Create(&m.User{
		Phone:         data.Phone,
		AdminID:       data.AdminID,
		DiscountID:    data.DiscountID,
		Username:      data.Username,
		Email:         data.Email,
		Password:      hashedPwd,
		Source:        &source,
		Avatar:        data.Avatar,
		Status:        u.Else(data.Status, m.UserStatusEnabled),
		ContactQQ:     data.ContactQQ,
		ContactWechat: data.ContactWechat,
	})
	if errors.Is(err, gorm.ErrDuplicatedKey) {
		return core.NewBizErr("账号已存在，请检查手机号/用户名/邮箱是否重复")
	}
	if err != nil {
		return err
	}

	return nil
}

type CreateUserByAdminData struct {
	Phone         string        `json:"phone" validate:"required"`
	AdminID       *int32        `json:"admin_id"`
	DiscountID    *int32        `json:"discount_id"`
	Username      *string       `json:"username"`
	Email         *string       `json:"email"`
	Password      *string       `json:"password"`
	Avatar        *string       `json:"avatar"`
	Status        *m.UserStatus `json:"status"`
	ContactQQ     *string       `json:"contact_qq"`
	ContactWechat *string       `json:"contact_wechat"`
}

// UpdateByAdmin 管理员更新用户的数据
func (s *userService) UpdateByAdmin(data UpdateUserByAdminData) error {
	do := make([]field.AssignExpr, 0)

	if data.Phone != nil {
		do = append(do, q.User.Phone.Value(*data.Phone))
	}
	if data.AdminID != nil {
		do = append(do, q.User.AdminID.Value(*data.AdminID))
	}
	if data.DiscountID != nil {
		do = append(do, q.User.DiscountID.Value(*data.DiscountID))
	}
	if data.Username != nil {
		do = append(do, q.User.Username.Value(*data.Username))
	}
	if data.Email != nil {
		do = append(do, q.User.Email.Value(*data.Email))
	}
	if data.Password != nil {
		hash, err := bcrypt.GenerateFromPassword([]byte(*data.Password), bcrypt.DefaultCost)
		if err != nil {
			return core.NewServErr("密码加密失败", err)
		}
		do = append(do, q.User.Password.Value(string(hash)))
	}
	if data.Name != nil {
		do = append(do, q.User.Name.Value(*data.Name))
	}
	if data.Avatar != nil {
		do = append(do, q.User.Avatar.Value(*data.Avatar))
	}
	if data.Status != nil {
		do = append(do, q.User.Status.Value(int(*data.Status)))
	}
	if data.IDType != nil {
		do = append(do, q.User.IDType.Value(int(*data.IDType)))
	}
	if data.IDNo != nil {
		do = append(do, q.User.IDNo.Value(*data.IDNo))
	}
	if data.IDToken != nil {
		do = append(do, q.User.IDToken.Value(*data.IDToken))
	}
	if data.ContactQQ != nil {
		do = append(do, q.User.ContactQQ.Value(*data.ContactQQ))
	}
	if data.ContactWechat != nil {
		do = append(do, q.User.ContactWechat.Value(*data.ContactWechat))
	}

	if len(do) == 0 {
		return nil
	}

	_, err := q.User.Where(q.User.ID.Eq(data.ID)).UpdateSimple(do...)
	if errors.Is(err, gorm.ErrDuplicatedKey) {
		return core.NewBizErr("账号已存在，请检查手机号/用户名/邮箱是否重复")
	}

	return err
}

type UpdateUserByAdminData struct {
	ID            int32         `json:"id" validate:"required"`
	Phone         *string       `json:"phone"`
	AdminID       *int32        `json:"admin_id"`
	DiscountID    *int32        `json:"discount_id"`
	Username      *string       `json:"username"`
	Email         *string       `json:"email"`
	Password      *string       `json:"password"`
	Name          *string       `json:"name"`
	Avatar        *string       `json:"avatar"`
	Status        *m.UserStatus `json:"status"`
	IDType        *m.UserIDType `json:"id_type"`
	IDNo          *string       `json:"id_no"`
	IDToken       *string       `json:"id_token"`
	ContactQQ     *string       `json:"contact_qq"`
	ContactWechat *string       `json:"contact_wechat"`
}

func (s *userService) RemoveByAdmin(id int32) error {
	_, err := q.User.Where(q.User.ID.Eq(id)).UpdateColumn(q.User.DeletedAt, time.Now())
	return err
}