// Fenrir console screen reader.
// Copyright (c) 2026 Storm Dragon
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.

package sound

import (
	"fmt"
	"strings"
)

type Options struct {
	Driver string
	Device string
	Volume float64
}

type Driver struct {
	ID, Label string
	open      func(*Service, string) error
}

// Drivers is the shared startup, validation and form registry. PipeWire uses
// its PulseAudio service; explicit selections never switch drivers on failure.
func Drivers() []Driver {
	return []Driver{{ID: "pulse", Label: "PulseAudio", open: open_pulse}, {ID: "alsa", Label: "ALSA", open: open_alsa}}
}

func Find_driver(id string) (Driver, error) {
	for _, driver := range Drivers() {
		if driver.ID == id {
			return driver, nil
		}
	}
	return Driver{}, fmt.Errorf("unknown sound driver %q", id)
}

func Validate_selection(driver, device string) error {
	if _, err := Find_driver(driver); err != nil {
		return err
	}
	if strings.TrimSpace(device) == "" || strings.ContainsAny(device, "\x00\r\n") {
		return fmt.Errorf("sound device must be a nonempty ALSA PCM name")
	}
	return nil
}