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

using System.Collections.Generic;
using System.Linq;
using FakeItEasy;
using Squidex.Domain.Apps.Core.Apps;
using Squidex.Domain.Apps.Core.Contents;
using Squidex.Domain.Apps.Core.ConvertContent;
using Squidex.Domain.Apps.Core.Schemas;
using Squidex.Infrastructure;
using Squidex.Infrastructure.Json.Objects;
using Xunit;

namespace Squidex.Domain.Apps.Core.Operations.ConvertContent
{
    public class FieldConvertersTests
    {
        private readonly IAssetUrlGenerator assetUrlGenerator = A.Fake<IAssetUrlGenerator>();
        private readonly LanguagesConfig languagesConfig = LanguagesConfig.English.Set(Language.DE);

        public FieldConvertersTests()
        {
            A.CallTo(() => assetUrlGenerator.GenerateUrl(A<string>.Ignored))
                .ReturnsLazily(ctx => $"url/to/{ctx.GetArgument<string>(0)}");
        }

        [Fact]
        public void Should_filter_for_value_conversion()
        {
            var field = Fields.String(1, "string", Partitioning.Invariant);

            var input =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Object());

            var actual = FieldConverters.ForValues((f, i) => Value.Unset)(input, field);

            var expected = new ContentFieldData();

            Assert.Equal(expected, actual);
        }

        [Fact]
        public void Should_convert_for_value_conversion()
        {
            var field = Fields.Json(1, "json", Partitioning.Invariant);

            var input =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Object());

            var actual = FieldConverters.ForValues(ValueConverters.EncodeJson(TestUtils.DefaultSerializer))(input, field);

            var expected =
                new ContentFieldData()
                    .AddValue("iv", "e30=");

            Assert.Equal(expected, actual);
        }

        [Fact]
        public void Should_convert_name_to_id()
        {
            var field =
                Fields.Array(1, "1", Partitioning.Invariant,
                    Fields.Number(1, "field1"),
                    Fields.Number(2, "field2").Hide());

            var input =
                new ContentFieldData()
                    .AddJsonValue(
                        JsonValue.Array(
                            JsonValue.Object()
                                .Add("field1", 100)
                                .Add("field2", 200)
                                .Add("invalid", 300)));

            var actual = FieldConverters.ForNestedName2Id(ValueConverters.ExcludeHidden())(input, field);

            var expected =
               new ContentFieldData()
                    .AddJsonValue(
                        JsonValue.Array(
                            JsonValue.Object()
                                .Add("1", 100)));

            Assert.Equal(expected, actual);
        }

        [Fact]
        public void Should_convert_name_to_name()
        {
            var field =
                Fields.Array(1, "1", Partitioning.Invariant,
                    Fields.Number(1, "field1"),
                    Fields.Number(2, "field2").Hide());

            var input =
                new ContentFieldData()
                    .AddJsonValue(
                        JsonValue.Array(
                            JsonValue.Object()
                                .Add("field1", 100)
                                .Add("field2", 200)
                                .Add("invalid", 300)));

            var actual = FieldConverters.ForNestedName2Name(ValueConverters.ExcludeHidden())(input, field);

            var expected =
                new ContentFieldData()
                    .AddJsonValue(
                        JsonValue.Array(
                            JsonValue.Object()
                                .Add("field1", 100)));

            Assert.Equal(expected, actual);
        }

        [Fact]
        public void Should_convert_id_to_id()
        {
            var field =
                Fields.Array(1, "1", Partitioning.Invariant,
                    Fields.Number(1, "field1"),
                    Fields.Number(2, "field2").Hide());

            var input =
               new ContentFieldData()
                    .AddValue("iv",
                        JsonValue.Array(
                            JsonValue.Object()
                                .Add("1", 100)
                                .Add("2", 200)
                                .Add("99", 300)));

            var actual = FieldConverters.ForNestedId2Id(ValueConverters.ExcludeHidden())(input, field);

            var expected =
               new ContentFieldData()
                    .AddValue("iv",
                        JsonValue.Array(
                            JsonValue.Object()
                                .Add("1", 100)));

            Assert.Equal(expected, actual);
        }

        [Fact]
        public void Should_convert_id_to_name()
        {
            var field =
                Fields.Array(1, "1", Partitioning.Invariant,
                    Fields.Number(1, "field1"),
                    Fields.Number(2, "field2").Hide());

            var input =
               new ContentFieldData()
                    .AddValue("iv",
                        JsonValue.Array(
                            JsonValue.Object()
                                .Add("1", 100)
                                .Add("2", 200)
                                .Add("99", 300)));

            var actual = FieldConverters.ForNestedId2Name(ValueConverters.ExcludeHidden())(input, field);

            var expected =
               new ContentFieldData()
                    .AddValue("iv",
                        JsonValue.Array(
                            JsonValue.Object()
                                .Add("field1", 100)));

            Assert.Equal(expected, actual);
        }

        [Fact]
        public void Should_return_same_values_when_excluding_changed_types_if_all_values_are_valid()
        {
            var field = Fields.Number(1, "number", Partitioning.Invariant);

            var source =
                new ContentFieldData()
                    .AddValue("en", null)
                    .AddValue("de", 1);

            var result = FieldConverters.ForValues(ValueConverters.ExcludeChangedTypes())(source, field);

            Assert.Same(source, result);
        }

        [Fact]
        public void Should_return_null_when_excluding_changed_types_if_any_value_is_invalid()
        {
            var field = Fields.Number(1, "number", Partitioning.Invariant);

            var source =
                new ContentFieldData()
                    .AddValue("en", "EN")
                    .AddValue("de", 0);

            var result = FieldConverters.ForValues(ValueConverters.ExcludeChangedTypes())(source, field);

            Assert.Null(result);
        }

        [Fact]
        public void Should_return_same_values_if_field_not_hidden()
        {
            var field = Fields.String(1, "string", Partitioning.Language);

            var source = new ContentFieldData();

            var result = FieldConverters.ExcludeHidden()(source, field);

            Assert.Same(source, result);
        }

        [Fact]
        public void Should_return_null_values_if_field_hidden()
        {
            var field = Fields.String(1, "string", Partitioning.Language);

            var source = new ContentFieldData();

            var result = FieldConverters.ExcludeHidden()(source, field.Hide());

            Assert.Null(result);
        }

        [Fact]
        public void Should_resolve_languages_and_cleanup_old_languages()
        {
            var field = Fields.String(1, "string", Partitioning.Language);

            var source =
                new ContentFieldData()
                    .AddValue("en", "EN")
                    .AddValue("it", "IT");

            var expected =
                new ContentFieldData()
                    .AddValue("en", "EN");

            var result = FieldConverters.ResolveLanguages(languagesConfig)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_resolve_languages_and_resolve_master_language_from_invariant()
        {
            var field = Fields.String(1, "string", Partitioning.Language);

            var source =
                new ContentFieldData()
                    .AddValue("iv", "A")
                    .AddValue("it", "B");

            var expected =
                new ContentFieldData()
                    .AddValue("en", "A");

            var result = FieldConverters.ResolveLanguages(languagesConfig)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_return_same_values_if_resolving_languages_from_invariant_field()
        {
            var field = Fields.String(1, "string", Partitioning.Invariant);

            var source = new ContentFieldData();

            var result = FieldConverters.ResolveLanguages(languagesConfig)(source, field);

            Assert.Same(source, result);
        }

        [Fact]
        public void Should_resolve_invariant_and_use_direct_value()
        {
            var field = Fields.String(1, "string", Partitioning.Invariant);

            var source =
                new ContentFieldData()
                    .AddValue("iv", "A")
                    .AddValue("it", "B");

            var expected =
                new ContentFieldData()
                    .AddValue("iv", "A");

            var result = FieldConverters.ResolveInvariant(languagesConfig)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_resolve_invariant_and_resolve_invariant_from_master_language()
        {
            var field = Fields.String(1, "string", Partitioning.Invariant);

            var source =
                new ContentFieldData()
                    .AddValue("de", "DE")
                    .AddValue("en", "EN");

            var expected =
                new ContentFieldData()
                    .AddValue("iv", "EN");

            var result = FieldConverters.ResolveInvariant(languagesConfig)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_resolve_invariant_and_resolve_invariant_from_first_language()
        {
            var field = Fields.String(1, "string", Partitioning.Invariant);

            var source =
                new ContentFieldData()
                    .AddValue("de", "DE")
                    .AddValue("it", "IT");

            var expected =
                new ContentFieldData()
                    .AddValue("iv", "DE");

            var result = FieldConverters.ResolveInvariant(languagesConfig)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_return_same_values_if_resolving_invariant_from_language_field()
        {
            var field = Fields.String(1, "string", Partitioning.Language);

            var source = new ContentFieldData();

            var result = FieldConverters.ResolveInvariant(languagesConfig)(source, field);

            Assert.Same(source, result);
        }

        [Fact]
        public void Should_return_language_from_fallback_if_found()
        {
            var field = Fields.String(1, "string", Partitioning.Language);

            var config =
                LanguagesConfig.English
                    .Set(Language.DE)
                    .Set(Language.IT)
                    .Set(Language.ES, false, Language.IT);

            var source =
                new ContentFieldData()
                    .AddValue("en", "EN")
                    .AddValue("it", "IT");

            var expected =
                new ContentFieldData()
                    .AddValue("en", "EN")
                    .AddValue("de", "EN")
                    .AddValue("it", "IT")
                    .AddValue("es", "IT");

            var result = FieldConverters.ResolveFallbackLanguages(config)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_not_return_value_if_master_is_missing()
        {
            var field = Fields.String(1, "string", Partitioning.Language);

            var source =
                new ContentFieldData()
                    .AddValue("de", "DE");

            var expected =
                new ContentFieldData()
                    .AddValue("de", "DE");

            var result = FieldConverters.ResolveFallbackLanguages(languagesConfig)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_filter_languages()
        {
            var field = Fields.String(1, "string", Partitioning.Language);

            var source =
                new ContentFieldData()
                    .AddValue("en", "EN")
                    .AddValue("de", "DE");

            var expected =
                new ContentFieldData()
                    .AddValue("de", "DE");

            var result = FieldConverters.FilterLanguages(languagesConfig, new[] { Language.DE })(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_return_master_language_if_languages_to_filter_are_invalid()
        {
            var field = Fields.String(1, "string", Partitioning.Language);

            var source =
                new ContentFieldData()
                    .AddValue("en", "EN")
                    .AddValue("de", "DE");

            var expected =
                new ContentFieldData()
                    .AddValue("en", "EN");

            var result = FieldConverters.FilterLanguages(languagesConfig, new[] { Language.CA })(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_return_same_values_if_resolving_fallback_languages_from_invariant_field()
        {
            var field = Fields.String(1, "string", Partitioning.Invariant);

            var source = new ContentFieldData();

            var result = FieldConverters.ResolveFallbackLanguages(languagesConfig)(source, field);

            Assert.Same(source, result);
        }

        [Fact]
        public void Should_return_same_values_if_filtered_languages_is_empty()
        {
            var field = Fields.String(1, "string", Partitioning.Language);

            var source = new ContentFieldData();

            var result = FieldConverters.FilterLanguages(languagesConfig, Enumerable.Empty<Language>())(source, field);

            Assert.Same(source, result);
        }

        [Fact]
        public void Should_return_same_values_if_filtering_languages_from_invariant_field()
        {
            var field = Fields.String(1, "string", Partitioning.Invariant);

            var source = new ContentFieldData();

            var result = FieldConverters.FilterLanguages(languagesConfig, null)(source, field);

            Assert.Same(source, result);
        }

        [Fact]
        public void Should_convert_asset_ids_to_urls()
        {
            var field = Fields.Assets(1, "assets", Partitioning.Invariant);

            var source =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array("1", "2"));

            var expected =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array("url/to/1", "url/to/2"));

            var result = FieldConverters.ResolveAssetUrls(new HashSet<string>(new[] { "assets" }), assetUrlGenerator)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_convert_nested_asset_ids_to_urls()
        {
            var field =
                Fields.Array(1, "array", Partitioning.Invariant,
                    Fields.Assets(1, "assets"));

            var source =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array(
                        JsonValue.Object()
                            .Add("assets", JsonValue.Array("1", "2"))));

            var expected =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array(
                        JsonValue.Object()
                            .Add("assets", JsonValue.Array("url/to/1", "url/to/2"))));

            var result = FieldConverters.ResolveAssetUrls(new HashSet<string>(new[] { "array.assets" }), assetUrlGenerator)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_convert_asset_ids_to_urls_for_wildcard_fields()
        {
            var field = Fields.Assets(1, "assets", Partitioning.Invariant);

            var source =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array("1", "2"));

            var expected =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array("url/to/1", "url/to/2"));

            var result = FieldConverters.ResolveAssetUrls(new HashSet<string>(new[] { "*" }), assetUrlGenerator)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_convert_nested_asset_ids_to_urls_for_wildcard_fields()
        {
            var field =
                Fields.Array(1, "array", Partitioning.Invariant,
                    Fields.Assets(1, "assets"));

            var source =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array(
                        JsonValue.Object()
                            .Add("assets", JsonValue.Array("1", "2"))));

            var expected =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array(
                        JsonValue.Object()
                            .Add("assets", JsonValue.Array("url/to/1", "url/to/2"))));

            var result = FieldConverters.ResolveAssetUrls(new HashSet<string>(new[] { "*" }), assetUrlGenerator)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_not_convert_asset_ids_to_urls_when_field_does_not_match()
        {
            var field = Fields.Assets(1, "assets", Partitioning.Invariant);

            var source =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array("1", "2"));

            var expected =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array("1", "2"));

            var result = FieldConverters.ResolveAssetUrls(new HashSet<string>(new[] { "other" }), assetUrlGenerator)(source, field);

            Assert.Equal(expected, result);
        }

        [Fact]
        public void Should_not_convert_asset_ids_to_urls_when_fields_is_null()
        {
            var field = Fields.Assets(1, "assets", Partitioning.Invariant);

            var source =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array("1", "2"));

            var expected =
                new ContentFieldData()
                    .AddJsonValue(JsonValue.Array("1", "2"));

            var result = FieldConverters.ResolveAssetUrls(null, assetUrlGenerator)(source, field);

            Assert.Equal(expected, result);
        }
    }
}