package files

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

func setupEnvDir(t *testing.T) string {
	t.Helper()
	dir := t.TempDir()
	files := []string{".env", ".env.local", ".env.production"}
	for _, f := range files {
		if err := os.WriteFile(filepath.Join(dir, f), []byte("KEY=val"), 0o644); err != nil {
			t.Fatal(err)
		}
	}
	// A file that should NOT be matched.
	if err := os.WriteFile(filepath.Join(dir, "env.txt"), []byte("not env"), 0o644); err != nil {
		t.Fatal(err)
	}
	// Skipped directory.
	nm := filepath.Join(dir, "node_modules")
	if err := os.MkdirAll(nm, 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(nm, ".env"), []byte("skip"), 0o644); err != nil {
		t.Fatal(err)
	}
	return dir
}

func TestFindEnvFiles_MatchesEnvPrefix(t *testing.T) {
	dir := setupEnvDir(t)
	found, err := FindEnvFiles(dir)
	if err != nil {
		t.Fatalf("FindEnvFiles: %v", err)
	}
	if len(found) != 3 {
		t.Errorf("found %d files, want 3: %v", len(found), found)
	}
}

func TestFindEnvFiles_SkipsNodeModules(t *testing.T) {
	dir := setupEnvDir(t)
	found, err := FindEnvFiles(dir)
	if err != nil {
		t.Fatalf("FindEnvFiles: %v", err)
	}
	for _, f := range found {
		if filepath.Dir(f) == filepath.Join(dir, "node_modules") {
			t.Errorf("node_modules .env should be skipped, got %s", f)
		}
	}
}

func TestLockEnvFiles_SetsReadOnly(t *testing.T) {
	dir := setupEnvDir(t)
	result, err := LockEnvFiles(dir)
	if err != nil {
		t.Fatalf("LockEnvFiles: %v", err)
	}
	if result.Total != 3 {
		t.Errorf("Total = %d, want 3", result.Total)
	}
	if len(result.Failed) != 0 {
		t.Errorf("unexpected failures: %v", result.Failed)
	}
	for _, p := range result.OK {
		info, err := os.Stat(p)
		if err != nil {
			t.Fatal(err)
		}
		if info.Mode()&0o222 != 0 {
			t.Errorf("file %s should be read-only, got mode %v", p, info.Mode())
		}
	}
}

func TestUnlockEnvFiles_SetsReadWrite(t *testing.T) {
	dir := setupEnvDir(t)
	if _, err := LockEnvFiles(dir); err != nil {
		t.Fatalf("LockEnvFiles: %v", err)
	}
	result, err := UnlockEnvFiles(dir)
	if err != nil {
		t.Fatalf("UnlockEnvFiles: %v", err)
	}
	if len(result.Failed) != 0 {
		t.Errorf("unexpected failures: %v", result.Failed)
	}
	for _, p := range result.OK {
		info, err := os.Stat(p)
		if err != nil {
			t.Fatal(err)
		}
		if info.Mode()&0o200 == 0 {
			t.Errorf("file %s should be writable, got mode %v", p, info.Mode())
		}
	}
}