package users

import "github.com/jmoiron/sqlx"

const usersCreate = `
CREATE TABLE users (
	id SERIAL,
	name text NOT NULL UNIQUE
);
`
const (
	addUserQuery    = `INSERT INTO users (name) VALUES ($1) RETURNING id;`
	getUserQuery    = `SELECT * FROM users WHERE name=$1;`
	updateUserQuery = `UPDATE users SET (name)=(:name);`
	deleteUseQuery  = `DELETE FROM users WHERE id=:id;`
)

// User represents an user
type User struct {
	ID   int
	Name string
}

// Get returns user with specified name
func Get(q sqlx.Queryer, name string) (*User, error) {
	u := &User{}
	err := q.QueryRowx(getUserQuery, name).StructScan(u)
	if err != nil {
		return nil, err
	}
	return u, nil
}

// Add user to database or raises an error
func (u *User) Add(q sqlx.Queryer) error {
	var id int
	err := q.QueryRowx(addUserQuery, u.Name).Scan(&id)
	if err != nil {
		return err
	}
	u.ID = id
	return nil
}

// Update user on database or raise an error
func (u *User) Update(ex *sqlx.DB) error {
	_, err := ex.NamedExec(updateUserQuery, u)
	if err != nil {
		return err
	}
	return nil
}

// Delete user from database or raise an error
func (u *User) Delete(ex *sqlx.DB) error {
	_, err := ex.NamedExec(deleteUseQuery, u)
	if err != nil {
		return err
	}
	return nil
}