package database

import (
	"backend/model"
	"encoding/json"
	"errors"
	"fmt"
	"os"
	"strings"

	"gorm.io/gorm"
)

func CreateUser(user *model.User) error {
	e := Db.Where(model.User{
		Username: user.Username,
	}).FirstOrCreate(&user).Error
	if e != nil {
		return e
	}
	return nil
}

func GetUserById(id string) (*model.User, error) {
	var user model.User
	e := Db.First(&user, "id = ?", id).Error
	if e != nil {
		if errors.Is(e, gorm.ErrRecordNotFound) {
			return nil, fmt.Errorf("user not found")
		}
		return nil, e
	}
	return &user, nil
}

func GetUserByUsername(username string) (*model.User, error) {
	var user model.User
	e := Db.First(&user, "username = ?", username).Error
	if e != nil {
		if errors.Is(e, gorm.ErrRecordNotFound) {
			return nil, fmt.Errorf("user not found")
		}
		return nil, e
	}
	return &user, nil
}

func DeleteUser(id string) error {
	var user model.User
	e := Db.First(&user, "id = ?", id).Error
	if e != nil {
		if errors.Is(e, gorm.ErrRecordNotFound) {
			return fmt.Errorf("user not found")
		}
		return e
	}
	e = Db.Unscoped().Delete(&user).Error
	if e != nil {
		if errors.Is(e, gorm.ErrRecordNotFound) {
			return fmt.Errorf("user not found")
		}
		return e
	}
	return nil
}

func GetUsersFromFile(filename string) []model.User {
	data, e := os.ReadFile(filename)
	if e != nil {
		panic(e)
	}
	decoder := json.NewDecoder(strings.NewReader(string(data)))
	var res []model.User
	decoder.Decode(&res)
	return res
}

func GetAllUsers() ([]model.User, error) {
	var users []model.User
	e := Db.Find(&users).Error
	if e != nil {
		return nil, e
	}
	return users, nil
}