package unit

import (
	"context"
	"errors"
	"testing"
	"time"

	"autostore/internal/application/commands"
	"autostore/internal/domain/entities"
	"autostore/internal/domain/specifications"
	"autostore/internal/domain/value_objects"
)

func createExpiredItem1() *entities.ItemEntity {
	expirationTime, _ := time.Parse(dateFormat, expiredDate)
	itemID, _ := value_objects.NewItemIDFromString("550e8400-e29b-41d4-a716-446655440001")
	userID, _ := value_objects.NewUserIDFromString("550e8400-e29b-41d4-a716-446655440003")
	expirationDate, _ := value_objects.NewExpirationDate(expirationTime)

	item, _ := entities.NewItem(itemID, "Expired Item 1", expirationDate, "http://example.com/order1", userID)
	return item
}

func createExpiredItem2() *entities.ItemEntity {
	expirationTime, _ := time.Parse(dateFormat, expiredDate)
	itemID, _ := value_objects.NewItemIDFromString("550e8400-e29b-41d4-a716-446655440002")
	userID, _ := value_objects.NewUserIDFromString("550e8400-e29b-41d4-a716-446655440004")
	expirationDate, _ := value_objects.NewExpirationDate(expirationTime)

	item, _ := entities.NewItem(itemID, "Expired Item 2", expirationDate, "http://example.com/order2", userID)
	return item
}

func createTestHandleExpiredItemsCommand() (*commands.HandleExpiredItemsCommand, *mockItemRepository, *mockOrderService, *mockTimeProvider, *specifications.ItemExpirationSpec, *mockLogger) {
	itemRepo := &mockItemRepository{}
	orderService := &mockOrderService{}
	timeProvider := &mockTimeProvider{
		nowFunc: func() time.Time {
			t, _ := time.Parse(dateFormat, mockedNow)
			return t
		},
	}
	expirationSpec := specifications.NewItemExpirationSpec()
	logger := &mockLogger{}

	cmd := commands.NewHandleExpiredItemsCommand(itemRepo, orderService, timeProvider, expirationSpec, logger)
	return cmd, itemRepo, orderService, timeProvider, expirationSpec, logger
}

func TestWhenNoExpiredItemsExistThenNoOrdersPlaced(t *testing.T) {
	// Given
	cmd, itemRepo, orderService, _, _, logger := createTestHandleExpiredItemsCommand()

	itemRepo.findWhereFunc = func(ctx context.Context, spec specifications.Specification[*entities.ItemEntity]) ([]*entities.ItemEntity, error) {
		return []*entities.ItemEntity{}, nil
	}

	orderCalled := false
	orderService.orderItemFunc = func(ctx context.Context, item *entities.ItemEntity) error {
		orderCalled = true
		return nil
	}

	deleteCalled := false
	itemRepo.deleteFunc = func(ctx context.Context, id value_objects.ItemID) error {
		deleteCalled = true
		return nil
	}

	// When
	err := cmd.Execute(context.Background())

	// Then
	if err != nil {
		t.Errorf("Expected no error, got %v", err)
	}
	if orderCalled {
		t.Error("Expected order service not to be called")
	}
	if deleteCalled {
		t.Error("Expected delete not to be called")
	}
	if len(logger.errorLogs) > 0 {
		t.Error("Expected no error logs")
	}
}

func TestWhenExpiredItemsExistThenOrdersPlacedAndItemsDeleted(t *testing.T) {
	// Given
	cmd, itemRepo, orderService, _, _, logger := createTestHandleExpiredItemsCommand()

	expiredItem1 := createExpiredItem1()
	expiredItem2 := createExpiredItem2()
	expiredItems := []*entities.ItemEntity{expiredItem1, expiredItem2}

	itemRepo.findWhereFunc = func(ctx context.Context, spec specifications.Specification[*entities.ItemEntity]) ([]*entities.ItemEntity, error) {
		return expiredItems, nil
	}

	orderCallCount := 0
	orderService.orderItemFunc = func(ctx context.Context, item *entities.ItemEntity) error {
		orderCallCount++
		return nil
	}

	deleteCallCount := 0
	itemRepo.deleteFunc = func(ctx context.Context, id value_objects.ItemID) error {
		deleteCallCount++
		return nil
	}

	// When
	err := cmd.Execute(context.Background())

	// Then
	if err != nil {
		t.Errorf("Expected no error, got %v", err)
	}
	if orderCallCount != 2 {
		t.Errorf("Expected order service to be called 2 times, got %d", orderCallCount)
	}
	if deleteCallCount != 2 {
		t.Errorf("Expected delete to be called 2 times, got %d", deleteCallCount)
	}
	if len(logger.errorLogs) > 0 {
		t.Error("Expected no error logs")
	}
}

func TestWhenOrderServiceFailsForOneItemThenErrorLoggedAndOtherItemProcessed(t *testing.T) {
	// Given
	cmd, itemRepo, orderService, _, _, logger := createTestHandleExpiredItemsCommand()

	expiredItem1 := createExpiredItem1()
	expiredItem2 := createExpiredItem2()
	expiredItems := []*entities.ItemEntity{expiredItem1, expiredItem2}

	itemRepo.findWhereFunc = func(ctx context.Context, spec specifications.Specification[*entities.ItemEntity]) ([]*entities.ItemEntity, error) {
		return expiredItems, nil
	}

	orderCallCount := 0
	orderService.orderItemFunc = func(ctx context.Context, item *entities.ItemEntity) error {
		orderCallCount++
		if orderCallCount == 1 {
			return errors.New("order service failed")
		}
		return nil
	}

	deleteCallCount := 0
	itemRepo.deleteFunc = func(ctx context.Context, id value_objects.ItemID) error {
		deleteCallCount++
		return nil
	}

	// When
	err := cmd.Execute(context.Background())

	// Then
	if err != nil {
		t.Errorf("Expected no error, got %v", err)
	}
	if orderCallCount != 2 {
		t.Errorf("Expected order service to be called 2 times, got %d", orderCallCount)
	}
	if deleteCallCount != 1 {
		t.Errorf("Expected delete to be called 1 time (only for successful order), got %d", deleteCallCount)
	}
	if len(logger.errorLogs) != 1 {
		t.Errorf("Expected 1 error log, got %d", len(logger.errorLogs))
	}
}

func TestWhenRepositoryFindThrowsErrorThenErrorReturned(t *testing.T) {
	// Given
	cmd, itemRepo, orderService, _, _, logger := createTestHandleExpiredItemsCommand()

	expectedError := errors.New("repository find error")
	itemRepo.findWhereFunc = func(ctx context.Context, spec specifications.Specification[*entities.ItemEntity]) ([]*entities.ItemEntity, error) {
		return nil, expectedError
	}

	orderCalled := false
	orderService.orderItemFunc = func(ctx context.Context, item *entities.ItemEntity) error {
		orderCalled = true
		return nil
	}

	// When
	err := cmd.Execute(context.Background())

	// Then
	if err == nil {
		t.Error("Expected error, got nil")
	}
	if orderCalled {
		t.Error("Expected order service not to be called")
	}
	if len(logger.errorLogs) != 1 {
		t.Errorf("Expected 1 error log, got %d", len(logger.errorLogs))
	}
}

func TestWhenRepositoryDeleteThrowsExceptionThenErrorLogged(t *testing.T) {
	// Given
	cmd, itemRepo, orderService, _, _, logger := createTestHandleExpiredItemsCommand()

	expiredItem1 := createExpiredItem1()
	expiredItems := []*entities.ItemEntity{expiredItem1}

	itemRepo.findWhereFunc = func(ctx context.Context, spec specifications.Specification[*entities.ItemEntity]) ([]*entities.ItemEntity, error) {
		return expiredItems, nil
	}

	orderService.orderItemFunc = func(ctx context.Context, item *entities.ItemEntity) error {
		return nil
	}

	expectedError := errors.New("delete failed")
	itemRepo.deleteFunc = func(ctx context.Context, id value_objects.ItemID) error {
		return expectedError
	}

	// When
	err := cmd.Execute(context.Background())

	// Then
	if err == nil {
		t.Error("Expected error, got nil")
	}
	if len(logger.errorLogs) != 1 {
		t.Errorf("Expected 1 error log, got %d", len(logger.errorLogs))
	}
}

func TestWhenTimeProviderThrowsErrorThenErrorReturned(t *testing.T) {
	// Given
	cmd, _, _, timeProvider, _, _ := createTestHandleExpiredItemsCommand()

	timeProvider.nowFunc = func() time.Time {
		panic("time provider error")
	}

	// When & Then
	defer func() {
		if r := recover(); r != nil {
			// Expected panic
		} else {
			t.Error("Expected panic when time provider fails")
		}
	}()

	cmd.Execute(context.Background())
}

func TestWhenAllOrderServicesFailThenAllErrorsLogged(t *testing.T) {
	// Given
	cmd, itemRepo, orderService, _, _, logger := createTestHandleExpiredItemsCommand()

	expiredItem1 := createExpiredItem1()
	expiredItem2 := createExpiredItem2()
	expiredItems := []*entities.ItemEntity{expiredItem1, expiredItem2}

	itemRepo.findWhereFunc = func(ctx context.Context, spec specifications.Specification[*entities.ItemEntity]) ([]*entities.ItemEntity, error) {
		return expiredItems, nil
	}

	orderService.orderItemFunc = func(ctx context.Context, item *entities.ItemEntity) error {
		return errors.New("order service failed")
	}

	deleteCalled := false
	itemRepo.deleteFunc = func(ctx context.Context, id value_objects.ItemID) error {
		deleteCalled = true
		return nil
	}

	// When
	err := cmd.Execute(context.Background())

	// Then
	if err != nil {
		t.Errorf("Expected no error, got %v", err)
	}
	if deleteCalled {
		t.Error("Expected delete not to be called when all orders fail")
	}
	if len(logger.errorLogs) != 2 {
		t.Errorf("Expected 2 error logs, got %d", len(logger.errorLogs))
	}
}