// /**
//  * 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 System.Collections.Generic;
using ln.http.mime;

namespace ln.http
{
    public class FileSystemRouter : IDisposable
    {
        private string _rootPath;
        public String RootPath
        {
            get => _rootPath;
            private set
            {
                _rootPath = Path.GetFullPath(value);
            }
        }

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

        private HttpServer _httpServer;
        
        public FileSystemRouter(HttpServer httpServer, string path)
        {
            _httpServer = httpServer;
            httpServer?.AddRouter(this.Route);
            
            if (!Directory.Exists(path))
                throw new FileNotFoundException();

            RootPath = path;
            Console.Error.WriteLine("FileSystemRouter created ({0})", RootPath);

            AddIndex("index.html");
            AddIndex("index.htm");
        }
        public FileSystemRouter(string path)
            :this(null, path)
        {
        }

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

        public bool Route(HttpContext httpContext)
        {
            string finalPath = httpContext.RoutableUri.Length > 0 ? Path.Combine(RootPath, httpContext.RoutableUri.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)
                {
                    httpContext.Response = new HttpResponse(httpContext.Request, new FileStream(finalPath, FileMode.Open, FileAccess.Read));
                    httpContext.Response.SetHeader("content-type", MimeTypeMap.GetMimeType(Path.GetExtension(finalPath)));
                    return true;
                }
            }
            return false;
        }

        public void Dispose()
        {
            _httpServer?.RemoveRouter(this.Route);
            _httpServer = null;
        }
    }

}