// ==========================================================================
//  Squidex Headless CMS
// ==========================================================================
//  Copyright (c) Squidex UG (haftungsbeschränkt)
//  All rights reserved. Licensed under the MIT license.
// ==========================================================================

using System.Collections.Generic;
using Squidex.Domain.Apps.Core.Apps;
using Squidex.Domain.Apps.Entities.Apps.Commands;
using Squidex.Domain.Apps.Entities.TestHelpers;
using Squidex.Infrastructure;
using Squidex.Infrastructure.Validation;
using Xunit;

namespace Squidex.Domain.Apps.Entities.Apps.Guards
{
    public class GuardAppLanguagesTests
    {
        private readonly LanguagesConfig languages = LanguagesConfig.English.Set(Language.DE);

        [Fact]
        public void CanAddLanguage_should_throw_exception_if_language_is_null()
        {
            var command = new AddLanguage();

            ValidationAssert.Throws(() => GuardAppLanguages.CanAdd(languages, command),
                new ValidationError("Language code is required.", "Language"));
        }

        [Fact]
        public void CanAddLanguage_should_throw_exception_if_language_already_added()
        {
            var command = new AddLanguage { Language = Language.EN };

            ValidationAssert.Throws(() => GuardAppLanguages.CanAdd(languages, command),
                new ValidationError("Language has already been added."));
        }

        [Fact]
        public void CanAddLanguage_should_not_throw_exception_if_language_valid()
        {
            var command = new AddLanguage { Language = Language.IT };

            GuardAppLanguages.CanAdd(languages, command);
        }

        [Fact]
        public void CanRemoveLanguage_should_throw_exception_if_language_is_null()
        {
            var command = new RemoveLanguage();

            ValidationAssert.Throws(() => GuardAppLanguages.CanRemove(languages, command),
                new ValidationError("Language code is required.", "Language"));
        }

        [Fact]
        public void CanRemoveLanguage_should_throw_exception_if_language_not_found()
        {
            var command = new RemoveLanguage { Language = Language.IT };

            Assert.Throws<DomainObjectNotFoundException>(() => GuardAppLanguages.CanRemove(languages, command));
        }

        [Fact]
        public void CanRemoveLanguage_should_throw_exception_if_language_is_master()
        {
            var command = new RemoveLanguage { Language = Language.EN };

            ValidationAssert.Throws(() => GuardAppLanguages.CanRemove(languages, command),
                new ValidationError("Master language cannot be removed."));
        }

        [Fact]
        public void CanRemoveLanguage_should_not_throw_exception_if_language_is_valid()
        {
            var command = new RemoveLanguage { Language = Language.DE };

            GuardAppLanguages.CanRemove(languages, command);
        }

        [Fact]
        public void CanUpdateLanguage_should_throw_exception_if_language_is_null()
        {
            var command = new UpdateLanguage();

            ValidationAssert.Throws(() => GuardAppLanguages.CanUpdate(languages, command),
                new ValidationError("Language code is required.", "Language"));
        }

        [Fact]
        public void CanUpdateLanguage_should_throw_exception_if_language_is_optional_and_master()
        {
            var command = new UpdateLanguage { Language = Language.EN, IsOptional = true };

            ValidationAssert.Throws(() => GuardAppLanguages.CanUpdate(languages, command),
                new ValidationError("Master language cannot be made optional.", "IsMaster"));
        }

        [Fact]
        public void CanUpdateLanguage_should_throw_exception_if_fallback_language_defined_and_master()
        {
            var command = new UpdateLanguage { Language = Language.EN, Fallback = new List<Language> { Language.DE } };

            ValidationAssert.Throws(() => GuardAppLanguages.CanUpdate(languages, command),
                new ValidationError("Master language cannot have fallback languages.", "Fallback"));
        }

        [Fact]
        public void CanUpdateLanguage_should_throw_exception_if_language_has_invalid_fallback()
        {
            var command = new UpdateLanguage { Language = Language.DE, Fallback = new List<Language> { Language.IT } };

            ValidationAssert.Throws(() => GuardAppLanguages.CanUpdate(languages, command),
                new ValidationError("App does not have fallback language 'Italian'.", "Fallback"));
        }

        [Fact]
        public void CanUpdateLanguage_should_throw_exception_if_not_found()
        {
            var command = new UpdateLanguage { Language = Language.IT };

            Assert.Throws<DomainObjectNotFoundException>(() => GuardAppLanguages.CanUpdate(languages, command));
        }

        [Fact]
        public void CanUpdateLanguage_should_not_throw_exception_if_language_is_valid()
        {
            var command = new UpdateLanguage { Language = Language.DE, Fallback = new List<Language> { Language.EN } };

            GuardAppLanguages.CanUpdate(languages, command);
        }
    }
}