package gocache

import (
	"os"
	"testing"
)

var mumlimit int64 = 1024 * 1024 * 1024
var bucketCount = 16

func TestNewKVStore(t *testing.T) {
	store := NewKVStore("test.db", mumlimit, bucketCount)
	if store == nil {
		t.Error("Expected a new KVStore instance, got nil")
	}
}

func TestPutAndGet(t *testing.T) {
	store := NewKVStore("test.db", mumlimit, bucketCount)
	store.Put("key1", "value1")
	value, exists := store.Get("key1")
	if !exists || value != "value1" {
		t.Error("Expected value 'value1' for key 'key1'")
	}
}

func TestDelete(t *testing.T) {
	store := NewKVStore("test.db", mumlimit, bucketCount)
	store.Put("key1", "value1")
	store.Delete("key1")
	_, exists := store.Get("key1")
	if exists {
		t.Error("Expected key 'key1' to be deleted")
	}
}

func TestSaveAndLoadFromFile(t *testing.T) {
	store := NewKVStore("test.db", mumlimit, bucketCount)
	store.Put("key1", "value1")
	err := store.SaveToFile()
	if err != nil {
		t.Error("Failed to save store to file")
	}

	newStore := NewKVStore("test.db", mumlimit, bucketCount)
	err = newStore.LoadFromFile()
	if err != nil {
		t.Error("Failed to load store from file")
	}

	value, exists := newStore.Get("key1")
	if !exists || value != "value1" {
		t.Error("Expected value 'value1' for key 'key1' after loading from file")
	}

	// Clean up
	os.Remove("test.db")
	os.Remove("test.db.log")
}

func TestLogOperation(t *testing.T) {
	store := NewKVStore("test.db", mumlimit, bucketCount)
	err := store.LogOperation("put", "key1", "value1")
	if err != nil {
		t.Error("Failed to log operation")
	}

	// Clean up
	os.Remove("test.db.log")
}

func TestTransaction(t *testing.T) {
	store := NewKVStore("test.db", mumlimit, bucketCount)
	store.BeginTransaction()
	store.PutInTransaction("key1", "value1")
	store.Commit()

	value, exists := store.Get("key1")
	if !exists || value != "value1" {
		t.Error("Expected value 'value1' for key 'key1' after commit")
	}

	store.BeginTransaction()
	store.PutInTransaction("key2", "value2")
	store.Rollback()

	_, exists = store.Get("key2")
	if exists {
		t.Error("Expected key 'key2' to be rolled back")
	}

	// 新增测试：验证事务中的PutInTransaction
	store.BeginTransaction()
	store.PutInTransaction("key3", "value3")
	value, exists = store.Get("key3")
	if !exists || value != "value3" {
		t.Error("Expected value 'value3' for key 'key3' during transaction")
	}
	store.Commit()

	value, exists = store.Get("key3")
	if !exists || value != "value3" {
		t.Error("Expected value 'value3' for key 'key3' after commit")
	}

	// Clean up
	os.Remove("test.db")
	os.Remove("test.db.log")
}