using System.Collections.Generic;
using Moq;
using NUnit.Framework;
using Umbraco.Cms.Core.Cache;
using Umbraco.Cms.Core.Models;
using Umbraco.Cms.Core.PropertyEditors;

namespace Umbraco.Cms.Tests.UnitTests.Umbraco.Core.Cache
{
    [TestFixture]
    public class ValueEditorCacheTests
    {

        [Test]
        public void Caches_ValueEditor()
        {
            var sut = new ValueEditorCache();

            var dataEditor = new FakeDataEditor("TestEditor");
            IDataType dataType = CreateDataTypeMock(1).Object;

            // Request the same value editor twice
            IDataValueEditor firstEditor = sut.GetValueEditor(dataEditor, dataType);
            IDataValueEditor secondEditor = sut.GetValueEditor(dataEditor, dataType);

            Assert.Multiple(() =>
            {
                Assert.AreSame(firstEditor, secondEditor);
                Assert.AreEqual(1, dataEditor.ValueEditorCount, "GetValueEditor invoked more than once.");
            });
        }

        [Test]
        public void Different_Data_Editors_Returns_Different_Value_Editors()
        {
            var sut = new ValueEditorCache();

            var dataEditor1 = new FakeDataEditor("Editor1");
            var dataEditor2 = new FakeDataEditor("Editor2");
            IDataType dataType = CreateDataTypeMock(1).Object;

            IDataValueEditor firstEditor = sut.GetValueEditor(dataEditor1, dataType);
            IDataValueEditor secondEditor = sut.GetValueEditor(dataEditor2, dataType);

            Assert.AreNotSame(firstEditor, secondEditor);
        }

        [Test]
        public void Different_Data_Types_Returns_Different_Value_Editors()
        {
            var sut = new ValueEditorCache();
            var dataEditor = new FakeDataEditor("Editor");
            IDataType dataType1 = CreateDataTypeMock(1).Object;
            IDataType dataType2 = CreateDataTypeMock(2).Object;

            IDataValueEditor firstEditor = sut.GetValueEditor(dataEditor, dataType1);
            IDataValueEditor secondEditor = sut.GetValueEditor(dataEditor, dataType2);

            Assert.AreNotSame(firstEditor, secondEditor);
        }

        [Test]
        public void Clear_Cache_Removes_Specific_Editors()
        {
            var sut = new ValueEditorCache();

            var dataEditor1 = new FakeDataEditor("Editor 1");
            var dataEditor2 = new FakeDataEditor("Editor 2");

            IDataType dataType1 = CreateDataTypeMock(1).Object;
            IDataType dataType2 = CreateDataTypeMock(2).Object;

            // Load the editors into cache
            IDataValueEditor editor1DataType1 = sut.GetValueEditor(dataEditor1, dataType1);
            IDataValueEditor editor1Datatype2 = sut.GetValueEditor(dataEditor1, dataType2);
            IDataValueEditor editor2DataType1 = sut.GetValueEditor(dataEditor2, dataType1);
            IDataValueEditor editor2Datatype2 = sut.GetValueEditor(dataEditor2, dataType2);

            sut.ClearCache(new []{dataType1.Id});

            // New value editor objects should be created after it's cleared
            Assert.AreNotSame(editor1DataType1, sut.GetValueEditor(dataEditor1, dataType1), "Value editor was not cleared from cache");
            Assert.AreNotSame(editor2DataType1, sut.GetValueEditor(dataEditor2, dataType1), "Value editor was not cleared from cache");

            // But the value editors for data type 2 should be the same
            Assert.AreSame(editor1Datatype2, sut.GetValueEditor(dataEditor1, dataType2), "Too many editors was cleared from cache");
            Assert.AreSame(editor2Datatype2, sut.GetValueEditor(dataEditor2, dataType2), "Too many editors was cleared from cache");
        }


        private Mock<IDataType> CreateDataTypeMock(int id)
        {
            var mock = new Mock<IDataType>();
            mock.Setup(x => x.Id).Returns(id);
            return mock;
        }

        /// <summary>
        /// A fake IDataEditor
        /// </summary>
        /// <remarks>
        /// This is necessary to ensure that different objects are returned from GetValueEditor
        /// </remarks>
        private class FakeDataEditor : IDataEditor
        {
            public FakeDataEditor(string alias)
            {
                Alias = alias;
            }

            public string Alias { get; }
            public EditorType Type { get; }
            public string Name { get; }
            public string Icon { get; }
            public string Group { get; }
            public bool IsDeprecated { get; }

            public IDataValueEditor GetValueEditor()
            {
                ValueEditorCount++;
                return Mock.Of<IDataValueEditor>();
            }
            public IDataValueEditor GetValueEditor(object configuration) => GetValueEditor();

            public IDictionary<string, object> DefaultConfiguration { get; }
            public IConfigurationEditor GetConfigurationEditor() => throw new System.NotImplementedException();

            public IPropertyIndexValueFactory PropertyIndexValueFactory { get; }

            public int ValueEditorCount;
        }
    }
}