// /**
//  * File: FileSystemRouter.cs
//  * Author: haraldwolff
//  *
//  * This file and it's content is copyrighted by the Author and / or copyright holder.
//  * Any use wihtout proper permission is illegal and may lead to legal actions.
//  *
//  *
//  **/
using System;
using System.IO;
using ln.http.message;
using System.Collections.Generic;
namespace ln.http.router
{
    public class StaticRouter : IHttpRouter
    {
        public String RootPath { get; }

        List<string> indexNames = new List<string>();
        public String[] IndexNames => indexNames.ToArray();

        public StaticRouter(string path)
        {
            if (!Directory.Exists(path))
                throw new FileNotFoundException();

            RootPath = Path.GetFullPath(path);

            AddIndex("index.html");
            AddIndex("index.htm");
        }

        public void AddIndex(string indexName) => indexNames.Add(indexName);
        public void RemoveIndex(string indexName) => indexNames.Remove(indexName);

        public HttpResponse Route(HttpRoutingContext routingContext, HttpRequest httpRequest)
        {
            string finalPath = Path.Combine(RootPath, routingContext.Path.Substring(1));

            if (Directory.Exists(finalPath))
            {
                foreach (string indexName in indexNames)
                {
                    string indexFileName = Path.Combine(finalPath, indexName);
                    if (File.Exists(indexFileName))
                    {
                        finalPath = indexFileName;
                        break;
                    }
                }
            }

            if (File.Exists(finalPath))
            {
                lock (this)
                {
                    HttpResponse httpResponse = new HttpResponse(httpRequest, new FileStream(finalPath, FileMode.Open));
                    httpResponse.SetHeader("content-type", MimeTypeMap.GetMimeType(Path.GetExtension(finalPath)));
                    return httpResponse;
                }
            }
            return null;
        }
    }

}