using Gremlin_BlazorServer.Data.EntityClasses;
using System.Diagnostics;
using System.Reflection;
using System.Text;

namespace Gremlin_BlazorServer.Services
{
	internal static class FileService
	{
		private static readonly Encoding defaultEncodingIfNoBom = Encoding.UTF8;

		public static string ReadResource(string name)
		{
			Assembly assembly = Assembly.GetExecutingAssembly();
			// Format: "{Namespace}.{Folder}.{filename}.{Extension}"
			string resourcePath = name.StartsWith(nameof(Gremlin_BlazorServer)) ? name : assembly.GetManifestResourceNames().Single(str => str.EndsWith(name));
			using Stream? stream = assembly.GetManifestResourceStream(resourcePath);
			if (stream == null) { return ""; }
			using StreamReader reader = new(stream);
			return reader.ReadToEnd();
		}

		public static Encoding GetEncoding(string fileName)
		{
			Stream fileStream = File.OpenRead(fileName);
			using StreamReader reader = new(fileStream, defaultEncodingIfNoBom, true);
			_ = reader.Peek();
			Encoding encoding = reader.CurrentEncoding;
			return encoding;
		}

		public static void WriteQuoteToTsv(string quoteContent, Quote quote)
		{
			string datei = $"{quote.Path}{Path.DirectorySeparatorChar}{quote.QuotationNumber}.tsv";
			FileInfo fileInfo = new(datei);
			if (fileInfo.Directory == null) return;
			if (!fileInfo.Directory.Exists)
			{
				try
				{
					Directory.CreateDirectory(fileInfo.DirectoryName ?? "");
				}
				catch (Exception ex)
				{
					Debug.WriteLine(ex);
				}
			}
			using StreamWriter writer = new(datei, false, Encoding.UTF8);
			{
				writer.WriteLine(quoteContent);
			}
		}

		public static void WriteTexFile(Quote quote)
		{
			string datei = $"{quote.Path}{Path.DirectorySeparatorChar}{quote.QuotationNumber}.tex";
			FileInfo fileInfo = new(datei);
			if (fileInfo.Directory == null) return;
			if (!fileInfo.Directory.Exists) { _ = Directory.CreateDirectory(fileInfo.DirectoryName ?? ""); }
			using StreamWriter writer = new(datei, false, Encoding.UTF8);
			{
				writer.WriteLine(quote.Tex);
			}
		}
	}
}