package db

import "errors"

type Alias struct {
	Name    string
	Command string
}

func (db *DB) GetAlias(name string) (*Alias, error) {
	a := &Alias{}
	err := db.QueryRow("SELECT name, command FROM aliases WHERE name = ?", name).Scan(&a.Name, &a.Command)
	if err != nil {
		return nil, err
	}
	return a, nil
}

func (db *DB) SetAlias(name, command string) error {
	_, err := db.Exec(
		"INSERT INTO aliases (name, command) VALUES (?, ?) ON CONFLICT(name) DO UPDATE SET command = excluded.command",
		name, command,
	)
	return err
}

func (db *DB) DeleteAlias(name string) error {
	res, err := db.Exec("DELETE FROM aliases WHERE name = ?", name)
	if err != nil {
		return err
	}
	n, _ := res.RowsAffected()
	if n == 0 {
		return errors.New("alias not found")
	}
	return nil
}

func (db *DB) ListAliases() ([]*Alias, error) {
	rows, err := db.Query("SELECT name, command FROM aliases ORDER BY name")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var aliases []*Alias
	for rows.Next() {
		a := &Alias{}
		rows.Scan(&a.Name, &a.Command)
		aliases = append(aliases, a)
	}
	return aliases, nil
}