language selection now returns result

1 files changed, 79 insertions, 13 deletions

diff --git a/cmd/dolmetschctld/statemachine.go b/cmd/dolmetschctld/statemachine.go
index c388d24..2aba4bb 100644
--- a/cmd/dolmetschctld/statemachine.go
+++ b/cmd/dolmetschctld/statemachine.go
@@ -23,34 +23,92 @@
 package main
 
 import (
-	"time"
+	"errors"
+	"log"
 
 	"spreadspace.org/dolmetschctl/pkg/mixer"
 )
 
+type State int
+
+const (
+	StateNew = iota
+	StateSettling
+	StateSettled
+)
+
+func (s State) String() string {
+	switch s {
+	case StateNew:
+		return "new"
+	case StateSettling:
+		return "settling"
+	case StateSettled:
+		return "settled"
+	default:
+		return "unknown"
+	}
+}
+
 type Language string
 
+type LanguageChannels struct {
+	main  mixer.Channel
+	voice mixer.Channel
+}
+
+type selectLangRequest struct {
+	l        Language
+	resultCh chan error
+}
+
 type StateMachine struct {
 	mixer        *mixer.Mixer
-	selectLangCh chan Language
+	selectLangCh chan selectLangRequest
 	quitCh       chan bool
 	exitedCh     chan struct{}
+
+	languages map[Language]LanguageChannels
+
+	currentState State
+	currentLang  Language
+	targetLang   Language
 }
 
 func NewStateMachine(m *mixer.Mixer) (*StateMachine, error) {
 	sm := &StateMachine{mixer: m}
-	sm.selectLangCh = make(chan Language, 10)
+	sm.selectLangCh = make(chan selectLangRequest, 10)
 	sm.quitCh = make(chan bool, 1)
 	sm.exitedCh = make(chan struct{})
+
+	sm.languages = make(map[Language]LanguageChannels)
+	sm.languages["en"] = LanguageChannels{0x20, 0x24}
+	sm.languages["de"] = LanguageChannels{0x22, 0x25}
+
+	sm.currentState = StateNew
+	sm.currentLang = ""
+	sm.targetLang = ""
+
 	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) selectLang(l Language) error {
+	if l != "" {
+		if _, exists := sm.languages[l]; !exists {
+			return errors.New("language '" + string(l) + "' does not exist")
+		}
+	}
+	sm.targetLang = l
+	log.Printf("new target language: '%s'", sm.targetLang)
+	return nil
+}
+
+func (sm *StateMachine) reconcile() {
+	if sm.targetLang == sm.currentLang {
+		sm.currentState = StateSettled
+		return
+	}
+	sm.currentState = StateSettling
 }
 
 func (sm *StateMachine) run() {
@@ -58,11 +116,17 @@ func (sm *StateMachine) run() {
 
 	for {
 		select {
-		case l := <-sm.selectLangCh:
-			sm.selectLang(l)
+		case req := <-sm.selectLangCh:
+			req.resultCh <- sm.selectLang(req.l)
 		case <-sm.quitCh:
 			return
 		}
+
+		oldState := sm.currentState
+		sm.reconcile()
+		if oldState != sm.currentState {
+			log.Printf("new state: %s", sm.currentState)
+		}
 	}
 }
 
@@ -70,8 +134,10 @@ func (sm *StateMachine) Start() {
 	go sm.run()
 }
 
-func (sm *StateMachine) SelectLanguage(l Language) {
-	sm.selectLangCh <- l
+func (sm *StateMachine) SelectLanguage(l Language) error {
+	resultCh := make(chan error)
+	sm.selectLangCh <- selectLangRequest{l, resultCh}
+	return <-resultCh
 }
 
 func (sm *StateMachine) Shutdown() {