package handlers_test

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"

	"erp-mvp/core-service/internal/api/handlers"
	"erp-mvp/core-service/internal/models"
)

// MockOperationsService мок для OperationsService
type MockOperationsService struct {
	mock.Mock
}

func (m *MockOperationsService) PlaceItem(ctx context.Context, orgID uuid.UUID, req *models.PlaceItemRequest) (*models.ItemPlacement, error) {
	args := m.Called(ctx, orgID, req)
	return args.Get(0).(*models.ItemPlacement), args.Error(1)
}

func (m *MockOperationsService) MoveItem(ctx context.Context, placementID uuid.UUID, newLocationID uuid.UUID, orgID uuid.UUID) error {
	args := m.Called(ctx, placementID, newLocationID, orgID)
	return args.Error(0)
}

func (m *MockOperationsService) GetItemPlacements(ctx context.Context, itemID uuid.UUID, orgID uuid.UUID) ([]*models.ItemPlacement, error) {
	args := m.Called(ctx, itemID, orgID)
	return args.Get(0).([]*models.ItemPlacement), args.Error(1)
}

func (m *MockOperationsService) GetLocationPlacements(ctx context.Context, locationID uuid.UUID, orgID uuid.UUID) ([]*models.ItemPlacement, error) {
	args := m.Called(ctx, locationID, orgID)
	return args.Get(0).([]*models.ItemPlacement), args.Error(1)
}

func (m *MockOperationsService) UpdateQuantity(ctx context.Context, placementID uuid.UUID, quantity int, orgID uuid.UUID) error {
	args := m.Called(ctx, placementID, quantity, orgID)
	return args.Error(0)
}

func (m *MockOperationsService) DeletePlacement(ctx context.Context, placementID uuid.UUID, orgID uuid.UUID) error {
	args := m.Called(ctx, placementID, orgID)
	return args.Error(0)
}

func (m *MockOperationsService) Search(ctx context.Context, orgID uuid.UUID, req *models.SearchRequest) (*models.SearchResponse, error) {
	args := m.Called(ctx, orgID, req)
	return args.Get(0).(*models.SearchResponse), args.Error(1)
}



// TestNewOperationsHandler тестирует создание OperationsHandler
func TestNewOperationsHandler(t *testing.T) {
	// Arrange
	mockService := &MockOperationsService{}

	// Act
	handler := handlers.NewOperationsHandler(mockService)

	// Assert
	assert.NotNil(t, handler)
}

// TestOperationsHandler_PlaceItem_Success тестирует успешное размещение товара
func TestOperationsHandler_PlaceItem_Success(t *testing.T) {
	// Arrange
	gin.SetMode(gin.TestMode)

	mockOperationsService := &MockOperationsService{}
	handler := handlers.NewOperationsHandler(mockOperationsService)

	orgID := uuid.New()
	itemID := uuid.New()
	locationID := uuid.New()
	placementID := uuid.New()

	placeReq := &models.PlaceItemRequest{
		ItemID:     itemID,
		LocationID: locationID,
		Quantity:   10,
	}

	expectedPlacement := &models.ItemPlacement{
		ID:             placementID,
		OrganizationID: orgID,
		ItemID:         itemID,
		LocationID:     locationID,
		Quantity:       10,
	}

	mockOperationsService.On("PlaceItem", mock.Anything, orgID, placeReq).Return(expectedPlacement, nil)

	router := gin.New()
	router.POST("/operations/place", func(c *gin.Context) {
		setClaims(c, orgID)
		handler.PlaceItem(c)
	})

	reqBody, _ := json.Marshal(placeReq)

	// Act
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/operations/place", bytes.NewBuffer(reqBody))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	// Assert
	assert.Equal(t, http.StatusCreated, w.Code)

	var response models.ItemPlacement
	err := json.Unmarshal(w.Body.Bytes(), &response)
	assert.NoError(t, err)
	assert.Equal(t, itemID, response.ItemID)
	assert.Equal(t, locationID, response.LocationID)
	assert.Equal(t, 10, response.Quantity)

	mockOperationsService.AssertExpectations(t)
}

// TestOperationsHandler_PlaceItem_ValidationError тестирует ошибку валидации при размещении товара
func TestOperationsHandler_PlaceItem_ValidationError(t *testing.T) {
	// Arrange
	gin.SetMode(gin.TestMode)

	mockOperationsService := &MockOperationsService{}
	handler := handlers.NewOperationsHandler(mockOperationsService)

	orgID := uuid.New()

	// Невалидный запрос (отрицательное количество)
	invalidReq := map[string]interface{}{
		"item_id":     uuid.New().String(),
		"location_id": uuid.New().String(),
		"quantity":    -5, // Отрицательное количество
	}

	router := gin.New()
	router.POST("/operations/place", func(c *gin.Context) {
		setClaims(c, orgID)
		handler.PlaceItem(c)
	})

	reqBody, _ := json.Marshal(invalidReq)

	// Act
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("POST", "/operations/place", bytes.NewBuffer(reqBody))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	// Assert
	assert.Equal(t, http.StatusBadRequest, w.Code)

	mockOperationsService.AssertNotCalled(t, "PlaceItem")
}

// TestOperationsHandler_MoveItem_Success тестирует успешное перемещение товара
func TestOperationsHandler_MoveItem_Success(t *testing.T) {
	// Arrange
	gin.SetMode(gin.TestMode)

	mockOperationsService := &MockOperationsService{}
	handler := handlers.NewOperationsHandler(mockOperationsService)

	orgID := uuid.New()
	placementID := uuid.New()
	newLocationID := uuid.New()

	moveReq := map[string]interface{}{
		"new_location_id": newLocationID.String(),
	}

	mockOperationsService.On("MoveItem", mock.Anything, placementID, newLocationID, orgID).Return(nil)

	router := gin.New()
	router.PUT("/operations/move/:id", func(c *gin.Context) {
		setClaims(c, orgID)
		handler.MoveItem(c)
	})

	reqBody, _ := json.Marshal(moveReq)

	// Act
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("PUT", "/operations/move/"+placementID.String(), bytes.NewBuffer(reqBody))
	req.Header.Set("Content-Type", "application/json")
	router.ServeHTTP(w, req)

	// Assert
	assert.Equal(t, http.StatusOK, w.Code)

	var response map[string]string
	err := json.Unmarshal(w.Body.Bytes(), &response)
	assert.NoError(t, err)
	assert.Equal(t, "Item moved successfully", response["message"])

	mockOperationsService.AssertExpectations(t)
}

// TestOperationsHandler_GetItemPlacements_Success тестирует успешное получение размещений товара
func TestOperationsHandler_GetItemPlacements_Success(t *testing.T) {
	// Arrange
	gin.SetMode(gin.TestMode)

	mockOperationsService := &MockOperationsService{}
	handler := handlers.NewOperationsHandler(mockOperationsService)

	orgID := uuid.New()
	itemID := uuid.New()
	expectedPlacements := []*models.ItemPlacement{
		{
			ID:             uuid.New(),
			OrganizationID: orgID,
			ItemID:         itemID,
			LocationID:     uuid.New(),
			Quantity:       5,
		},
		{
			ID:             uuid.New(),
			OrganizationID: orgID,
			ItemID:         itemID,
			LocationID:     uuid.New(),
			Quantity:       3,
		},
	}

	mockOperationsService.On("GetItemPlacements", mock.Anything, itemID, orgID).Return(expectedPlacements, nil)

	router := gin.New()
	router.GET("/operations/items/:item_id/placements", func(c *gin.Context) {
		setClaims(c, orgID)
		handler.GetItemPlacements(c)
	})

	// Act
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/operations/items/"+itemID.String()+"/placements", nil)
	router.ServeHTTP(w, req)

	// Assert
	assert.Equal(t, http.StatusOK, w.Code)

	var response []*models.ItemPlacement
	err := json.Unmarshal(w.Body.Bytes(), &response)
	assert.NoError(t, err)
	assert.Len(t, response, 2)
	assert.Equal(t, itemID, response[0].ItemID)
	assert.Equal(t, itemID, response[1].ItemID)

	mockOperationsService.AssertExpectations(t)
}

// TestOperationsHandler_Search_Success тестирует успешный поиск
func TestOperationsHandler_Search_Success(t *testing.T) {
	// Arrange
	gin.SetMode(gin.TestMode)

	mockOperationsService := &MockOperationsService{}
	handler := handlers.NewOperationsHandler(mockOperationsService)

	orgID := uuid.New()
	expectedResponse := &models.SearchResponse{
		Items: []*models.ItemWithLocation{
			{
				Item: models.Item{
					ID:             uuid.New(),
					OrganizationID: orgID,
					Name:           "Test Item",
					Description:    "Test Description",
					Category:       "electronics",
				},
				Location: models.StorageLocation{
					ID:             uuid.New(),
					OrganizationID: orgID,
					Name:           "Test Location",
					Address:        "Test Address",
					Type:           "warehouse",
				},
				Quantity: 5,
			},
		},
		TotalCount: 1,
	}

	mockOperationsService.On("Search", mock.Anything, orgID, mock.AnythingOfType("*models.SearchRequest")).Return(expectedResponse, nil)

	router := gin.New()
	router.GET("/operations/search", func(c *gin.Context) {
		setClaims(c, orgID)
		handler.Search(c)
	})

	// Act
	w := httptest.NewRecorder()
	req, _ := http.NewRequest("GET", "/operations/search?q=test", nil)
	router.ServeHTTP(w, req)

	// Assert
	assert.Equal(t, http.StatusOK, w.Code)

	var response models.SearchResponse
	err := json.Unmarshal(w.Body.Bytes(), &response)
	assert.NoError(t, err)
	assert.Len(t, response.Items, 1)
	assert.Equal(t, "Test Item", response.Items[0].Item.Name)
	assert.Equal(t, 1, response.TotalCount)

	mockOperationsService.AssertExpectations(t)
}