using System;
using Markdig;
using Markdig.SyntaxHighlighting;
using Website.Models;

namespace Website.ViewModels
{
	public class BlogPostViewModel
	{
		public BlogPostViewModel(BlogPost blogPost)
		{
			Title = blogPost.Title;
			Timestamp = FormatTimestamp(blogPost.Timestamp);
			Url = blogPost.Url;

			Content = Markdown.ToHtml(blogPost.Content, GetPipeline()).Trim();
		}

		string GetDaySuffix(int day) {
			switch (day) {
				case 1:
				case 21:
				case 31:
					return @"\s\t";
				case 2:
				case 22:
					return @"\n\d";
				case 3:
				case 23:
					return @"\r\d";
				default:
					return @"\t\h";
			}
		}

		private string FormatTimestamp(DateTime timestamp) {
			var suffix = GetDaySuffix(timestamp.Day);
			return timestamp.ToString($@"dddd \t\h\e d{suffix} \o\f MMMM yyyy");
		}

		protected MarkdownPipeline GetPipeline()=>new MarkdownPipelineBuilder()
				//.UseAdvancedExtensions()
				.UseAutoLinks()
				.UseSoftlineBreakAsHardlineBreak()
				.UseSyntaxHighlighting()
				.Build();

		public string Title { get; private set; }
		public string Content { get; protected set; }
		public string Timestamp { get; private set; }
		public string Url { get; private set; }
	}
}