package hotkeys

import (
	"fmt"
	"path/filepath"
	"sync"
	"testing"
)

func TestSetBindingFileConcurrentUpdatesPreserveEveryBinding(t *testing.T) {
	path := filepath.Join(t.TempDir(), "input.conf")

	const updates = 24
	start := make(chan struct{})
	errs := make(chan error, updates)
	var wg sync.WaitGroup
	for i := 1; i <= updates; i++ {
		wg.Add(1)
		go func(i int) {
			defer wg.Done()
			<-start
			key := fmt.Sprintf("F%d", i)
			if _, err := SetBindingFile(path, key, fmt.Sprintf("seek %d", i), "", false); err != nil {
				errs <- err
			}
		}(i)
	}
	close(start)
	wg.Wait()
	close(errs)
	for err := range errs {
		t.Fatal(err)
	}

	conf, err := ReadInputConf(path)
	if err != nil {
		t.Fatal(err)
	}
	for i := 1; i <= updates; i++ {
		key := fmt.Sprintf("F%d", i)
		binding := FindBinding(conf, key)
		if binding == nil {
			t.Errorf("binding %s was lost", key)
			continue
		}
		if want := fmt.Sprintf("seek %d", i); binding.Command != want {
			t.Errorf("binding %s = %q, want %q", key, binding.Command, want)
		}
	}
}

func TestSetBindingFileConflictDoesNotOverwrite(t *testing.T) {
	path := filepath.Join(t.TempDir(), "input.conf")
	if _, err := SetBindingFile(path, "SPACE", "cycle pause", "", false); err != nil {
		t.Fatal(err)
	}
	existing, err := SetBindingFile(path, "SPACE", "cycle mute", "", false)
	if err != ErrBindingConflict {
		t.Fatalf("SetBindingFile conflict error = %v, want %v", err, ErrBindingConflict)
	}
	if existing == nil || existing.Command != "cycle pause" {
		t.Fatalf("existing binding = %#v, want cycle pause", existing)
	}
	conf, err := ReadInputConf(path)
	if err != nil {
		t.Fatal(err)
	}
	if got := FindBinding(conf, "SPACE"); got == nil || got.Command != "cycle pause" {
		t.Fatalf("conflict changed binding: %#v", got)
	}
}