package main

import (
	"sort"
	"testing"
)

// A combiner sums two amplifiers and commands nothing, so "combined" operation
// is really two amplifiers that must be kept in the same state. Leaving one in
// OPERATE while the other sits in STANDBY is exactly what must not happen —
// the combiner would then see power on one input only.
func TestAmpTargets(t *testing.T) {
	a := &App{}
	a.ampInsts = map[string]*ampInst{"left": {}, "right": {}, "third": {}}

	// Unlinked: only the amplifier that was clicked.
	if got := a.ampTargets("left", false); len(got) != 1 || got[0] != "left" {
		t.Errorf("unlinked = %v, want just [left]", got)
	}

	// Linked: every running amplifier, and the one clicked FIRST — a partial
	// failure should still have done what the operator asked before it stopped.

	got := a.ampTargets("right", true)
	if len(got) != 3 {
		t.Fatalf("linked = %v, want all three", got)
	}
	if got[0] != "right" {
		t.Errorf("clicked amplifier is %q, want it first", got[0])
	}
	rest := append([]string{}, got[1:]...)
	sort.Strings(rest)
	if rest[0] != "left" || rest[1] != "third" {
		t.Errorf("rest = %v, want the other two", rest)
	}
}