//
//  dolmetschctl
//
//
//  Copyright (C) 2019 Christian Pointner <equinox@spreadspace.org>
//
//  This file is part of dolmetschctl.
//
//  dolmetschctl 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
//  any later version.
//
//  dolmetschctl 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 dolmetschctl. If not, see <http://www.gnu.org/licenses/>.
//

package main

import (
	"time"

	"spreadspace.org/dolmetschctl/pkg/mixer"
)

type Language string

type StateMachine struct {
	mixer        *mixer.Mixer
	selectLangCh chan Language
	quitCh       chan bool
	exitedCh     chan struct{}
}

func NewStateMachine(m *mixer.Mixer) (*StateMachine, error) {
	sm := &StateMachine{mixer: m}
	sm.selectLangCh = make(chan Language, 10)
	sm.quitCh = make(chan bool, 1)
	sm.exitedCh = make(chan struct{})
	return sm, nil
}

func (sm *StateMachine) selectLang(l Language) {
	sm.mixer.UnMute(0x24)
	sm.mixer.SetLevel(0x24, 42)
	time.Sleep(2 * time.Second)
	sm.mixer.Mute(0x24)
	sm.mixer.SetLevel(0x24, mixer.FaderLevel0db)
}

func (sm *StateMachine) run() {
	defer close(sm.exitedCh)

	for {
		select {
		case l := <-sm.selectLangCh:
			sm.selectLang(l)
		case <-sm.quitCh:
			return
		}
	}
}

func (sm *StateMachine) Start() {
	go sm.run()
}

func (sm *StateMachine) SelectLanguage(l Language) {
	sm.selectLangCh <- l
}

func (sm *StateMachine) Shutdown() {
	select {
	case sm.quitCh <- true:
	default:
	}
	<-sm.exitedCh
}