// Copyright (c) Umbraco.
// See LICENSE for more details.

using System.Text.Encodings.Web;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.ViewEngines;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Mvc.ViewFeatures.Buffers;
using Microsoft.Extensions.WebEncoders.Testing;
using Moq;
using NUnit.Framework;
using Umbraco.Extensions;

namespace Umbraco.Cms.Tests.UnitTests.Umbraco.Web.Common.Extensions
{
    [TestFixture]
    public class HtmlHelperExtensionMethodsTests
    {
        private const string SampleWithAnchorElement = "Hello world, this is some text <a href='blah'>with a link</a>";
        private const string SampleWithBoldAndAnchorElements = "Hello world, <b>this</b> is some text <a href='blah'>with a link</a>";

        [SetUp]
        public virtual void Initialize() =>

            // Create an empty HtmlHelper.
            _htmlHelper = new HtmlHelper(
                Mock.Of<IHtmlGenerator>(),
                Mock.Of<ICompositeViewEngine>(),
                Mock.Of<IModelMetadataProvider>(),
                Mock.Of<IViewBufferScope>(),
                new HtmlTestEncoder(),
                UrlEncoder.Default);

        private HtmlHelper _htmlHelper;

        [Test]
        public void Truncate_Simple()
        {
            var result = _htmlHelper.Truncate(SampleWithAnchorElement, 25).ToString();

            Assert.AreEqual("Hello world, this is some&hellip;", result);
        }

        [Test]
        public void When_Truncating_A_String_Ends_With_A_Space_We_Should_Trim_The_Space_Before_Appending_The_Ellipsis()
        {
            var result = _htmlHelper.Truncate(SampleWithAnchorElement, 26).ToString();

            Assert.AreEqual("Hello world, this is some&hellip;", result);
        }

        [Test]
        public void Truncate_Inside_Word()
        {
            var result = _htmlHelper.Truncate(SampleWithAnchorElement, 24).ToString();

            Assert.AreEqual("Hello world, this is som&hellip;", result);
        }

        [Test]
        public void Truncate_With_Tag()
        {
            var result = _htmlHelper.Truncate(SampleWithAnchorElement, 35).ToString();

            Assert.AreEqual("Hello world, this is some text <a href='blah'>with&hellip;</a>", result);
        }

        [Test]
        public void Truncate_By_Words()
        {
            var result = _htmlHelper.TruncateByWords(SampleWithAnchorElement, 4).ToString();

            Assert.AreEqual("Hello world, this is&hellip;", result);
        }

        [Test]
        public void Truncate_By_Words_With_Tag()
        {
            var result = _htmlHelper.TruncateByWords(SampleWithBoldAndAnchorElements, 4).ToString();

            Assert.AreEqual("Hello world, <b>this</b> is&hellip;", result);
        }

        [Test]
        public void Truncate_By_Words_Mid_Tag()
        {
            var result = _htmlHelper.TruncateByWords(SampleWithAnchorElement, 7).ToString();

            Assert.AreEqual("Hello world, this is some text <a href='blah'>with&hellip;</a>", result);
        }

        [Test]
        public void Strip_All_Html()
        {
            var result = _htmlHelper.StripHtml(SampleWithBoldAndAnchorElements, null).ToString();

            Assert.AreEqual("Hello world, this is some text with a link", result);
        }

        [Test]
        public void Strip_Specific_Html()
        {
            string[] tags = { "b" };

            var result = _htmlHelper.StripHtml(SampleWithBoldAndAnchorElements, tags).ToString();

            Assert.AreEqual(SampleWithAnchorElement, result);
        }

        [Test]
        public void Strip_Invalid_Html()
        {
            const string text = "Hello world, <bthis</b> is some text <a href='blah'>with a link</a>";

            var result = _htmlHelper.StripHtml(text).ToString();

            Assert.AreEqual("Hello world, is some text with a link", result);
        }
    }
}