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using System;
using System.IO;
using System.Linq;
using System.Text;
using Markdig;
using Markdig.Renderers.Normalize;
using Markdig.Syntax;
using Markdig.Syntax.Inlines;
using Microsoft.AspNetCore.Mvc;
using Timeline.Controllers;
namespace Timeline.Services
{
public class MarkdownProcessor
{
public string Process(string text, Func<long, string> urlGenerator)
{
MarkdownDocument markdown = Markdown.Parse(text);
foreach (var link in markdown.Descendants().Where(e => e is LinkInline).Cast<LinkInline>())
{
if (int.TryParse(link.Url, out var dataIndex))
{
link.Url = urlGenerator(dataIndex);
}
}
var writer = new StringWriter();
NormalizeRenderer renderer = new NormalizeRenderer(writer);
renderer.Render(markdown);
return writer.ToString();
}
/// <summary>Convert data url to true url with post id.</summary>
public string Process(string text, IUrlHelper url, string timeline, long post)
{
return Process(
text,
dataIndex => url.ActionLink(
nameof(TimelinePostController.DataGet),
nameof(TimelinePostController)[0..^nameof(Controller).Length],
new { timeline, post, data_index = dataIndex }
)
);
}
public byte[] Process(byte[] data, IUrlHelper url, string timeline, long post)
{
return Encoding.UTF8.GetBytes(Process(Encoding.UTF8.GetString(data), url, timeline, post));
}
}
}
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