package config

import (
	"os"
	"path/filepath"
	"testing"
)

func TestLoadDefaultsAndCRFClamp(t *testing.T) {
	tmp := t.TempDir()
	t.Setenv("APPDATA", tmp)
	t.Setenv("XDG_CONFIG_HOME", tmp)

	cfg := Default()
	if cfg.DefaultCRF != 20 || cfg.DefaultPreset != "slow" || cfg.Language != "ru" {
		t.Fatalf("unexpected defaults: %+v", cfg)
	}

	cfg.DefaultCRF = 99
	if err := Save(cfg); err != nil {
		t.Fatalf("save failed: %v", err)
	}
	loaded := Load()
	if loaded.DefaultCRF != 20 {
		t.Fatalf("expected invalid CRF 99 to reset to 20, got %d", loaded.DefaultCRF)
	}

	// CRF 0 (lossless) must be preserved
	cfg.DefaultCRF = 0
	if err := Save(cfg); err != nil {
		t.Fatalf("save CRF 0 failed: %v", err)
	}
	loadedZero := Load()
	if loadedZero.DefaultCRF != 0 {
		t.Fatalf("expected CRF 0 to be preserved, got %d", loadedZero.DefaultCRF)
	}

	path, _ := ConfigPath()
	if _, err := os.Stat(filepath.Clean(path)); err != nil {
		t.Fatalf("config file missing: %v", err)
	}
}