package repo

import (
    "database/sql"
    "errors"

    "golang.org/x/crypto/bcrypt"
)

type User struct {
    ID           int64
    Name         string
    PasswordHash string
}

func GetUserByName(db *sql.DB, name string) (*User, error) {
    u := &User{}
    err := db.QueryRow("SELECT id, name, password_hash FROM users WHERE name = ?", name).Scan(&u.ID, &u.Name, &u.PasswordHash)
    if err != nil {
        if errors.Is(err, sql.ErrNoRows) {
            return nil, nil
        }
        return nil, err
    }
    return u, nil
}

func CreateUser(db *sql.DB, name, password string) error {
    hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
    if err != nil {
        return err
    }
    _, err = db.Exec("INSERT INTO users(name, password_hash) VALUES(?, ?)", name, string(hash))
    return err
}

func CheckPassword(u *User, password string) bool {
    return bcrypt.CompareHashAndPassword([]byte(u.PasswordHash), []byte(password)) == nil
}