package repository

import (
	"context"
	"errors"

	"github.com/cloudprint/cloudprint-backend/internal/model"
	"gorm.io/gorm"
)

type UserRepository struct {
	db *gorm.DB
}

func NewUserRepository(db *gorm.DB) *UserRepository {
	return &UserRepository{db: db}
}

func (r *UserRepository) Create(ctx context.Context, user *model.User) error {
	return r.db.WithContext(ctx).Create(user).Error
}

func (r *UserRepository) GetByID(ctx context.Context, id int32) (*model.User, error) {
	var user model.User
	err := r.db.WithContext(ctx).First(&user, id).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, nil
		}
		return nil, err
	}
	return &user, nil
}

func (r *UserRepository) GetByOpenid(ctx context.Context, openid string) (*model.User, error) {
	var user model.User
	err := r.db.WithContext(ctx).Where("openid = ?", openid).First(&user).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, nil
		}
		return nil, err
	}
	return &user, nil
}

func (r *UserRepository) Update(ctx context.Context, user *model.User) error {
	return r.db.WithContext(ctx).Save(user).Error
}

func (r *UserRepository) UpdateBalance(ctx context.Context, userID int32, balance float64) error {
	return r.db.WithContext(ctx).Model(&model.User{}).Where("id = ?", userID).Update("balance", balance).Error
}

func (r *UserRepository) DeductBalance(ctx context.Context, userID int32, amount float64) error {
	return r.db.WithContext(ctx).Model(&model.User{}).
		Where("id = ? AND balance >= ?", userID, amount).
		Update("balance", gorm.Expr("balance - ?", amount)).Error
}

func (r *UserRepository) AddBalance(ctx context.Context, userID int32, amount float64) error {
	return r.db.WithContext(ctx).Model(&model.User{}).Where("id = ?", userID).
		Update("balance", gorm.Expr("balance + ?", amount)).Error
}