package handler

import (
	"context"
	"testing"

	"git.logidex.ru/fakz9/logidex-id/internal/api/user/domain"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
)

// MockUserService implements service.UserService
type MockUserService struct {
	mock.Mock
}

func (m *MockUserService) GetUserByPhoneNumber(ctx context.Context, phoneNumber string) (*domain.User, error) {
	args := m.Called(ctx, phoneNumber)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(*domain.User), args.Error(1)
}

func (m *MockUserService) GetUserByUuid(ctx context.Context, uuid string) (*domain.User, error) {
	args := m.Called(ctx, uuid)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(*domain.User), args.Error(1)
}

func (m *MockUserService) CreateUser(ctx context.Context, phoneNumber string) (*domain.User, error) {
	args := m.Called(ctx, phoneNumber)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(*domain.User), args.Error(1)
}

func (m *MockUserService) VerifyUser(ctx context.Context, uuid string) (*domain.User, error) {
	args := m.Called(ctx, uuid)
	if args.Get(0) == nil {
		return nil, args.Error(1)
	}
	return args.Get(0).(*domain.User), args.Error(1)
}

func TestNewUserHandler(t *testing.T) {
	mockService := &MockUserService{}
	handler := NewUserHandler(mockService)

	assert.NotNil(t, handler)
	assert.Equal(t, mockService, handler.service)
	assert.Implements(t, (*StrictServerInterface)(nil), handler)
}

func TestUserHandler_GetUserById(t *testing.T) {
	tests := []struct {
		name           string
		userId         string
		setupMock      func(*MockUserService)
		expectedStatus int
		expectError    bool
		expectedMsg    string
	}{
		{
			name:   "successful user retrieval",
			userId: "123e4567-e89b-12d3-a456-426614174000",
			setupMock: func(m *MockUserService) {
				user := &domain.User{
					Uuid:        "123e4567-e89b-12d3-a456-426614174000",
					PhoneNumber: "+79161234567",
				}
				m.On("GetUserByUuid", mock.Anything, "123e4567-e89b-12d3-a456-426614174000").
					Return(user, nil).Once()
			},
			expectedStatus: 200, // Fixed copier bug
			expectError:    false,
		},
		{
			name:   "user not found",
			userId: "nonexistent-uuid",
			setupMock: func(m *MockUserService) {
				m.On("GetUserByUuid", mock.Anything, "nonexistent-uuid").
					Return(nil, domain.ErrUserNotFound{PhoneNumber: "nonexistent-uuid"}).Once()
			},
			expectedStatus: 404,
			expectError:    true,
			expectedMsg:    "User not found with phone number: nonexistent-uuid",
		},
		{
			name:   "service error",
			userId: "error-uuid",
			setupMock: func(m *MockUserService) {
				m.On("GetUserByUuid", mock.Anything, "error-uuid").
					Return(nil, assert.AnError).Once()
			},
			expectedStatus: 404,
			expectError:    true,
			expectedMsg:    assert.AnError.Error(),
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			mockService := &MockUserService{}
			handler := &UserHandler{service: mockService}
			ctx := context.Background()

			tt.setupMock(mockService)

			request := GetUserByIdRequestObject{
				UserId: tt.userId,
			}

			result, err := handler.GetUserById(ctx, request)

			assert.NoError(t, err) // Handler should not return errors, only response objects

			if tt.expectedStatus == 200 {
				response, ok := result.(GetUserById200JSONResponse)
				assert.True(t, ok, "Expected 200 response type")
				_ = response // Just to avoid unused variable error
			} else {
				response, ok := result.(GetUserById404JSONResponse)
				assert.True(t, ok, "Expected 404 response type")
				assert.Equal(t, tt.expectedMsg, response.Message)
				_ = response // Use the variable to avoid unused error
			}

			mockService.AssertExpectations(t)
		})
	}
}

func TestUserHandler_CreateUser(t *testing.T) {
	mockService := &MockUserService{}
	handler := &UserHandler{service: mockService}
	ctx := context.Background()

	t.Run("create user not implemented", func(t *testing.T) {
		request := CreateUserRequestObject{}

		// This should panic as per the current implementation
		assert.Panics(t, func() {
			_, _ = handler.CreateUser(ctx, request)
		}, "CreateUser should panic as it's not implemented")
	})
}

func TestUserHandler_EdgeCases(t *testing.T) {
	t.Run("empty user ID should be handled gracefully", func(t *testing.T) {
		mockService := &MockUserService{}
		handler := &UserHandler{service: mockService}
		ctx := context.Background()

		mockService.On("GetUserByUuid", mock.Anything, "").
			Return(nil, domain.ErrUserNotFound{PhoneNumber: ""}).Once()

		request := GetUserByIdRequestObject{
			UserId: "",
		}

		result, err := handler.GetUserById(ctx, request)

		assert.NoError(t, err)
		response, ok := result.(GetUserById404JSONResponse)
		assert.True(t, ok)
		assert.Contains(t, response.Message, "User not found")

		mockService.AssertExpectations(t)
	})

	t.Run("special characters in user ID", func(t *testing.T) {
		mockService := &MockUserService{}
		handler := &UserHandler{service: mockService}
		ctx := context.Background()

		specialUserId := "user@#$%^&*()"

		mockService.On("GetUserByUuid", mock.Anything, specialUserId).
			Return(nil, domain.ErrUserNotFound{PhoneNumber: specialUserId}).Once()

		request := GetUserByIdRequestObject{
			UserId: specialUserId,
		}

		result, err := handler.GetUserById(ctx, request)

		assert.NoError(t, err)
		response, ok := result.(GetUserById404JSONResponse)
		assert.True(t, ok)
		_ = response // Use the variable to avoid unused error

		mockService.AssertExpectations(t)
	})
}