package vault

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

func TestSaveLoadRoundTrip(t *testing.T) {
	dir := t.TempDir()
	v, err := Open(dir)
	if err != nil {
		t.Fatalf("open: %v", err)
	}
	secret := []byte(`{"cookies":"session=abc","token":"xyz"}`)
	if err = v.Save("acc-1", secret); err != nil {
		t.Fatalf("save: %v", err)
	}
	// 文件不应包含明文
	raw, _ := os.ReadFile(filepath.Join(dir, "vault.enc"))
	if stringContains(string(raw), "session=abc") {
		t.Fatal("vault file must not contain plaintext")
	}
	got, err := v.Load("acc-1")
	if err != nil {
		t.Fatalf("load: %v", err)
	}
	if string(got) != string(secret) {
		t.Fatalf("roundtrip mismatch: %s vs %s", got, secret)
	}
}

func TestReopenPersists(t *testing.T) {
	dir := t.TempDir()
	v1, _ := Open(dir)
	_ = v1.Save("acc-2", []byte("data-2"))
	v2, err := Open(dir)
	if err != nil {
		t.Fatalf("reopen: %v", err)
	}
	got, err := v2.Load("acc-2")
	if err != nil || string(got) != "data-2" {
		t.Fatalf("reopen mismatch: %s %v", got, err)
	}
}

func TestTamperFails(t *testing.T) {
	dir := t.TempDir()
	v, _ := Open(dir)
	_ = v.Save("acc-3", []byte("data-3"))
	path := filepath.Join(dir, "vault.enc")
	raw, _ := os.ReadFile(path)
	raw[len(raw)/2] ^= 0xff
	_ = os.WriteFile(path, raw, 0o600)
	if _, err := v.Load("acc-3"); err == nil {
		t.Fatal("tampered ciphertext should fail auth")
	}
}

func TestDelete(t *testing.T) {
	dir := t.TempDir()
	v, _ := Open(dir)
	_ = v.Save("acc-4", []byte("d4"))
	if err := v.Delete("acc-4"); err != nil {
		t.Fatalf("delete: %v", err)
	}
	if _, err := v.Load("acc-4"); err == nil {
		t.Fatal("deleted entry should not load")
	}
}

func stringContains(s, sub string) bool {
	return len(s) >= len(sub) && indexOf(s, sub) >= 0
}

func indexOf(s, sub string) int {
	for i := 0; i+len(sub) <= len(s); i++ {
		if s[i:i+len(sub)] == sub {
			return i
		}
	}
	return -1
}