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

using System.Collections.Generic;
using System.Threading.Tasks;
using FluentAssertions;
using Squidex.Domain.Apps.Core.Contents;
using Squidex.Domain.Apps.Core.Schemas;
using Squidex.Domain.Apps.Core.TestHelpers;
using Squidex.Infrastructure;
using Squidex.Infrastructure.Collections;
using Squidex.Infrastructure.Json.Objects;
using Xunit;

namespace Squidex.Domain.Apps.Core.Operations.ValidateContent
{
    public class ComponentFieldTests : IClassFixture<TranslationsFixture>
    {
        private readonly DomainId schemaId1 = DomainId.NewGuid();
        private readonly DomainId schemaId2 = DomainId.NewGuid();
        private readonly List<string> errors = new List<string>();

        [Fact]
        public void Should_instantiate_field()
        {
            var (_, sut, _) = Field(new ComponentFieldProperties());

            Assert.Equal("myComponent", sut.Name);
        }

        [Fact]
        public async Task Should_not_add_error_if_component_is_null_and_valid()
        {
            var (_, sut, components) = Field(new ComponentFieldProperties { SchemaId = schemaId1 });

            await sut.ValidateAsync(null, errors, components: components);

            Assert.Empty(errors);
        }

        [Fact]
        public async Task Should_not_add_error_if_component_is_valid()
        {
            var (id, sut, components) = Field(new ComponentFieldProperties { SchemaId = schemaId1 });

            await sut.ValidateAsync(CreateValue(id.ToString(), "componentField", 1), errors, components: components);

            Assert.Empty(errors);
        }

        [Fact]
        public async Task Should_add_error_if_component_is_required()
        {
            var (_, sut, components) = Field(new ComponentFieldProperties { SchemaId = schemaId1, IsRequired = true });

            await sut.ValidateAsync(null, errors, components: components);

            errors.Should().BeEquivalentTo(
                new[] { "Field is required." });
        }

        [Fact]
        public async Task Should_add_error_if_component_value_is_required()
        {
            var (id, sut, components) = Field(new ComponentFieldProperties { SchemaId = schemaId1, IsRequired = true }, true);

            await sut.ValidateAsync(CreateValue(id.ToString(), "componentField", null), errors, components: components);

            errors.Should().BeEquivalentTo(
                new[] { "componentField: Field is required." });
        }

        [Fact]
        public async Task Should_add_error_if_value_is_not_valid()
        {
            var (_, sut, components) = Field(new ComponentFieldProperties { SchemaId = schemaId1 });

            await sut.ValidateAsync(JsonValue.Create("Invalid"), errors, components: components);

            errors.Should().BeEquivalentTo(
                new[] { "Invalid json object, expected object with 'schemaId' field." });
        }

        [Fact]
        public async Task Should_add_error_if_value_has_no_discriminator()
        {
            var (_, sut, components) = Field(new ComponentFieldProperties { SchemaIds = ImmutableList.Create(schemaId1, schemaId2) });

            await sut.ValidateAsync(CreateValue(null, "field", 1), errors, components: components);

            errors.Should().BeEquivalentTo(
                new[] { "Invalid component. No 'schemaId' field found." });
        }

        [Fact]
        public async Task Should_add_error_if_value_has_invalid_discriminator_format()
        {
            var (_, sut, components) = Field(new ComponentFieldProperties { SchemaId = schemaId1 });

            await sut.ValidateAsync(CreateValue("invalid", "field", 1), errors, components: components);

            errors.Should().BeEquivalentTo(
                new[] { "Invalid component. Cannot find schema." });
        }

        [Fact]
        public async Task Should_add_error_if_value_has_invalid_discriminator_schema()
        {
            var (_, sut, components) = Field(new ComponentFieldProperties { SchemaId = schemaId2 });

            await sut.ValidateAsync(CreateValue(schemaId1.ToString(), "field", 1), errors, components: components);

            errors.Should().BeEquivalentTo(
                new[] { "Invalid component. Cannot find schema." });
        }

        [Fact]
        public async Task Should_resolve_schema_id_from_name()
        {
            var (_, sut, components) = Field(new ComponentFieldProperties { SchemaId = schemaId1 });

            var value = CreateValue("my-component", "componentField", 1, "schemaName");

            await sut.ValidateAsync(value, errors, components: components);

            Assert.Empty(errors);
            Assert.Equal(value[Component.Discriminator].ToString(), schemaId1.ToString());
        }

        [Fact]
        public async Task Should_resolve_schema_from_single_component()
        {
            var (_, sut, components) = Field(new ComponentFieldProperties { SchemaId = schemaId1 });

            var value = CreateValue(null, "componentField", 1);

            await sut.ValidateAsync(value, errors, components: components);

            Assert.Empty(errors);
            Assert.Equal(value[Component.Discriminator].ToString(), schemaId1.ToString());
        }

        private static JsonObject CreateValue(string? type, string key, object? value, string? discriminator = null)
        {
            var obj = JsonValue.Object();

            if (type != null)
            {
                discriminator ??= Component.Discriminator;

                obj[discriminator] = JsonValue.Create(type);
            }

            obj.Add(key, value);

            return obj;
        }

        private (DomainId, RootField<ComponentFieldProperties>, ResolvedComponents) Field(ComponentFieldProperties properties, bool isRequired = false)
        {
            var schema =
                new Schema("my-component")
                    .AddNumber(1, "componentField", Partitioning.Invariant,
                        new NumberFieldProperties { IsRequired = isRequired });

            var field = Fields.Component(1, "myComponent", Partitioning.Invariant, properties);

            var components = new ResolvedComponents(new Dictionary<DomainId, Schema>
            {
                [schemaId1] = schema,
                [schemaId2] = schema,
            });

            return (schemaId1, field, components);
        }
    }
}