day20, example 2 first four steps pass

day20/pulsePropagation.go

@@ -10,8 +10,50 @@ import (
 func Run() int {
 	fmt.Println("hello from dya 20")
 
+	filename := "day20/example2"
+	modules := ReadModules(filename)
+	log.Print("got modules:\n", modules)
+
+	low, high := PropagateButtonPress(modules)
+	log.Printf("got low %d and high %d\n", low, high)
+	log.Print("modules after single button press:\n", modules)
+
 	return 0
 }
+
+func PropagateButtonPress(modules map[string]Module) (lowSignalsCount, highSignalsCount int) {
+	signals := []Signal{{From: "button", To: "broadcast", PulseType: LowPulse}}
+	lowSignalsCount += 1
+
+	for len(signals) > 0 {
+		curSignal := signals[0]
+		signals = signals[1:]
+
+		log.Printf("%s -%s-> %s", curSignal.From, curSignal.PulseType, curSignal.To)
+
+		receivingModule, found := modules[curSignal.To]
+		if !found {
+			panic(fmt.Sprintf("signal %+v can't find it's recepient\n", curSignal))
+		}
+
+		newSignals := receivingModule.Receive(curSignal)
+
+		// all newSignals will have same type
+		newSignalsAmount := len(newSignals)
+		if newSignalsAmount > 0 {
+			signals = append(signals, newSignals...)
+			someNewSignal := newSignals[0]
+			if someNewSignal.PulseType == HighPulse {
+				highSignalsCount += newSignalsAmount
+			} else {
+				lowSignalsCount += newSignalsAmount
+			}
+		}
+	}
+
+	return
+}
+
 // process sends single `low pulse` directly to "broadcast"
 
 func ReadModules(filename string) map[string]Module {
@@ -46,3 +88,12 @@ func ReadModules(filename string) map[string]Module {
 
 	return result
 }
+
+func InitStuffs(allModules map[string]Module) {
+	for _, module := range allModules {
+		if conjunction, ok := module.(*Conjunction); ok {
+			conjunction.RegisterInputs(allModules)
+		}
+	}
+
+}