using Markdig;

using MfGames.Markdown.Extensions;
using MfGames.TestSetup;

using Xunit;
using Xunit.Abstractions;

namespace MfGames.Markdown.Tests;

/// <summary>
/// Tests the functionality of the WriteFiles().
/// </summary>
public class WikiLinkTest : TestBase<TestContext>
{
    public WikiLinkTest(ITestOutputHelper output)
        : base(output)
    {
    }

    [Fact]
    public void BareStringHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown.ToHtml(
            "This is text.",
            pipeline);

        Assert.Equal("<p>This is text.</p>\n", result);
    }

    [Fact]
    public void BlankStringHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown.ToHtml(
            "",
            pipeline);

        Assert.Equal("", result);
    }

    [Fact]
    public void LabeledWikiLinkHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown
            .ToHtml(
                "[[Test|Label]]",
                pipeline)
            .Replace("%5E", "^");

        Assert.Equal("<p><a href=\"^test$\">Label</a></p>\n", result);
    }

    [Fact]
    public void PossessiveLabeledWikiLinkHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown
            .ToHtml(
                "[[Test|Label]]'s",
                pipeline)
            .Replace("%5E", "^");

        Assert.Equal("<p><a href=\"^test$\">Label's</a></p>\n", result);
    }

    [Fact]
    public void PossessiveWikiLinkHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown
            .ToHtml(
                "[[Test]]'s",
                pipeline)
            .Replace("%5E", "^");

        Assert.Equal("<p><a href=\"^test$\">Test's</a></p>\n", result);
    }

    [Fact]
    public void PunctuationLabeledWikiLinkHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown
            .ToHtml(
                "[[Test|Label]].",
                pipeline)
            .Replace("%5E", "^");

        Assert.Equal("<p><a href=\"^test$\">Label</a>.</p>\n", result);
    }

    [Fact]
    public void PunctuationWikiLinkHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown
            .ToHtml(
                "[[Test]].",
                pipeline)
            .Replace("%5E", "^");

        Assert.Equal("<p><a href=\"^test$\">Test</a>.</p>\n", result);
    }

    [Fact]
    public void SentenceWikiLinkHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown
            .ToHtml(
                "This is a [[test]] of this system.",
                pipeline)
            .Replace("%5E", "^");

        Assert.Equal(
            "<p>This is a <a href=\"^test$\">test</a> of this system.</p>\n",
            result);
    }

    [Fact]
    public void SimpleWikiLinkHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown
            .ToHtml(
                "[[Test]]",
                pipeline)
            .Replace("%5E", "^");

        Assert.Equal("<p><a href=\"^test$\">Test</a></p>\n", result);
    }

    [Fact]
    public void StandardLinkHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown.ToHtml(
            "[Test](https://test/)",
            pipeline);

        Assert.Equal("<p><a href=\"https://test/\">Test</a></p>\n", result);
    }

    [Fact]
    public void TrailingLabeledWikiLinkHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown
            .ToHtml(
                "[[Test|Label]]s",
                pipeline)
            .Replace("%5E", "^");

        Assert.Equal("<p><a href=\"^test$\">Labels</a></p>\n", result);
    }

    [Fact]
    public void TrailingWikiLinkHtml()
    {
        MarkdownPipeline pipeline = CreatePipeline();
        string result = Markdig.Markdown
            .ToHtml(
                "[[Test]]s",
                pipeline)
            .Replace("%5E", "^");

        Assert.Equal("<p><a href=\"^test$\">Tests</a></p>\n", result);
    }

    private static MarkdownPipeline CreatePipeline()
    {
        WikiLinkOptions options = new()
        {
            GetUrl = (title) => string.Format(
                "^{0}$",
                title.ToLowerInvariant().Replace(" ", "-")),
        };

        MarkdownPipelineBuilder? builder = new MarkdownPipelineBuilder()
            .Use(new WikiLinkExtension(options));
        MarkdownPipeline? pipeline = builder.Build();

        return pipeline;
    }
}