package station

import (
	"errors"
	"io/fs"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestMissingHomeDoesNotCreateConfig(t *testing.T) {
	orig := userHomeDir
	t.Cleanup(func() { userHomeDir = orig })
	userHomeDir = func() (string, error) {
		return "", errors.New("no home")
	}

	path := filepath.Join(t.TempDir(), "lab.json")
	_, err := New(Options{ConfigPath: path})
	if err == nil || !strings.HasPrefix(err.Error(), "config path:") {
		t.Fatalf("New() error = %v, want a config path failure", err)
	}
	if _, statErr := os.Stat(path); !errors.Is(statErr, fs.ErrNotExist) {
		t.Fatalf("stat = %v, want the file absent", statErr)
	}
}

func TestMissingHomeDoesNotRewriteConfig(t *testing.T) {
	orig := userHomeDir
	t.Cleanup(func() { userHomeDir = orig })
	userHomeDir = func() (string, error) {
		return "", errors.New("no home")
	}

	path := filepath.Join(t.TempDir(), "lab.json")
	original := []byte("{\"host\":\"127.0.0.1\",\"port\":5308,\"callsign\":\"DL1ABC\",\"authKey\":\"key\",\"talkGroup\":20}\n")
	if err := os.WriteFile(path, original, 0o640); err != nil {
		t.Fatal(err)
	}
	_, err := New(Options{ConfigPath: path})
	if err == nil || !strings.HasPrefix(err.Error(), "config path:") {
		t.Fatalf("New() error = %v, want a config path failure", err)
	}
	got, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if string(got) != string(original) {
		t.Fatalf("file = %q, want %q", got, original)
	}
}