package store

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

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestFileStore_NewFileStore(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)
	assert.NotNil(t, store)
	assert.Equal(t, filePath, store.filePath)
	assert.Equal(t, filepath.Join(tempDir, "chats"), store.chatDir)
}

func TestFileStore_SaveChat(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	chat := &Chat{
		Title: "Test Chat",
	}

	err = store.SaveChat(chat)
	require.NoError(t, err)
	assert.NotEqual(t, uuid.Nil, chat.ID)
	assert.False(t, chat.CreatedAt.IsZero())

	// Verify the file was created
	chatFile := filepath.Join(store.chatDir, chat.ID.String()+".json")
	_, err = os.Stat(chatFile)
	assert.NoError(t, err)
}

func TestFileStore_GetChat(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	// Create and save a chat
	chat := &Chat{
		Title: "Test Chat",
	}
	err = store.SaveChat(chat)
	require.NoError(t, err)

	// Retrieve the chat
	retrievedChat, err := store.GetChat(chat.ID)
	require.NoError(t, err)
	assert.Equal(t, chat.ID, retrievedChat.ID)
	assert.Equal(t, chat.Title, retrievedChat.Title)
}

func TestFileStore_GetChat_NotFound(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	_, err = store.GetChat(uuid.New())
	assert.ErrorIs(t, err, ErrChatNotFound)
}

func TestFileStore_DeleteChat(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	// Create and save a chat
	chat := &Chat{
		Title: "Test Chat",
	}
	err = store.SaveChat(chat)
	require.NoError(t, err)

	// Verify the file was created
	chatFile := filepath.Join(store.chatDir, chat.ID.String()+".json")
	_, err = os.Stat(chatFile)
	assert.NoError(t, err)

	// Delete the chat
	err = store.DeleteChat(chat.ID)
	require.NoError(t, err)

	// Verify the file was deleted
	_, err = os.Stat(chatFile)
	assert.True(t, os.IsNotExist(err))
}

func TestFileStore_DeleteChat_NotFound(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	err = store.DeleteChat(uuid.New())
	assert.ErrorIs(t, err, ErrChatNotFound)
}

func TestFileStore_ListChats(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	// Create and save multiple chats
	chat1 := &Chat{Title: "Chat 1"}
	chat2 := &Chat{Title: "Chat 2"}

	err = store.SaveChat(chat1)
	require.NoError(t, err)

	err = store.SaveChat(chat2)
	require.NoError(t, err)

	// List all chats
	chats, err := store.ListChats()
	require.NoError(t, err)
	assert.Len(t, chats, 2)
}

func TestFileStore_SaveChatMessage(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	// Create and save a chat
	chat := &Chat{Title: "Test Chat"}
	err = store.SaveChat(chat)
	require.NoError(t, err)

	// Create and save a message
	message := &Message{
		ChatID:  chat.ID,
		Role:    "user",
		Content: "Hello",
	}

	err = store.SaveChatMessage(message)
	require.NoError(t, err)
	assert.NotEqual(t, uuid.Nil, message.ID)
	assert.False(t, message.CreatedAt.IsZero())

	// Verify the chat file was updated
	chatFile := filepath.Join(store.chatDir, chat.ID.String()+".json")
	_, err = os.Stat(chatFile)
	assert.NoError(t, err)
}

func TestFileStore_SaveChatMessage_InvalidChatID(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	message := &Message{
		ChatID:  uuid.Nil,
		Role:    "user",
		Content: "Hello",
	}

	err = store.SaveChatMessage(message)
	assert.ErrorIs(t, err, ErrNilChatID)
}

func TestFileStore_SaveChatMessage_ChatNotFound(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	message := &Message{
		ChatID:  uuid.New(),
		Role:    "user",
		Content: "Hello",
	}

	err = store.SaveChatMessage(message)
	assert.ErrorIs(t, err, ErrChatNotFound)
}

func TestFileStore_SaveSettings(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	settings := &Settings{
		APIEndpoint:             "http://example.com",
		ImageEditSelector:       ".image-edit",
		ImageGenerationSelector: ".image-gen",
		TextGenerationSelector:  ".text-gen",
	}

	err = store.SaveSettings(settings)
	require.NoError(t, err)

	// Verify the settings file was created
	_, err = os.Stat(filePath)
	assert.NoError(t, err)
}

func TestFileStore_GetSettings(t *testing.T) {
	tempDir := t.TempDir()
	filePath := filepath.Join(tempDir, "test.json")

	store, err := NewFileStore(filePath)
	require.NoError(t, err)

	// Get settings when none exist
	settings, err := store.GetSettings()
	require.NoError(t, err)
	assert.NotNil(t, settings)

	// Set some settings
	settings = &Settings{
		APIEndpoint:             "http://example.com",
		ImageEditSelector:       ".image-edit",
		ImageGenerationSelector: ".image-gen",
		TextGenerationSelector:  ".text-gen",
	}
	err = store.SaveSettings(settings)
	require.NoError(t, err)

	// Get the settings
	settings, err = store.GetSettings()
	require.NoError(t, err)
	assert.Equal(t, "http://example.com", settings.APIEndpoint)
}