/**************************************************************************
 *                                                                        *
 *  File:        DocumentManager.cs                                       *
 *  Copyright:   (c) 2008-2010, Florin Leon                               *
 *  E-mail:      fleon@cs.tuiasi.ro                                       *
 *  Website:     http://florinleon.byethost24.com/lab_ip.htm              *
 *  Description: Secret documents application with Protection Proxy.      *
 *               The Protection Proxy (Software Engineering lab 9)        *
 *                                                                        *
 *  This code and information is provided "as is" without warranty of     *
 *  any kind, either expressed or implied, including but not limited      *
 *  to the implied warranties of merchantability or fitness for a         *
 *  particular purpose. You are free to use this source code in your      *
 *  applications as long as the original copyright notice is included.    *
 *                                                                        *
 **************************************************************************/

using System;
using System.Collections.Generic;
using System.IO;
using static ProtectionProxy.ProxyDocumentManager;

namespace ProtectionProxy
{
    public class ProxyDocumentManager : IDocumentManager
    {
        private RealDocumentManager _realDocumentManager;
        private List<User> _users;
        private List<string> _levels;
        private const string Path = "Secure\\";

        public struct User
        {
            public readonly string Name;
            public readonly string PassHash;
            public readonly int AccessLevel;

            public User(string name, string passHash, int accessLevel)
            {
                Name = name;
                PassHash = passHash;
                AccessLevel = accessLevel;
            }
        }

        public ProxyDocumentManager()
        {
            _levels = new List<string>();
            StreamReader sr = new StreamReader(Path + "niveluri.txt");
            string[] lvls = sr.ReadToEnd().Split(" \t\r\n".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
            sr.Close();

            for (int i = 0; i < lvls.Length; i++)
                _levels.Add(lvls[i]);

            _users = new List<User>();
            sr = new StreamReader(Path + "utilizatori.txt");
            while (sr.Peek() != -1)
            {
                string[] toks = sr.ReadLine().Split('\t');
                User user = new User(toks[0], toks[1], Convert.ToInt32(toks[2]));
                _users.Add(user);
            }
            sr.Close();
        }

        #region IDocumentManager Members
         public bool Login(string username,string password)
        {
            bool ok = false;
            string hashPass = Cryptography.HashString(password);
            foreach(User u in _users)
            {
                if(u.Name==username && u.PassHash==hashPass)
                {
                    ok = true;
                    _realDocumentManager = new RealDocumentManager(u.AccessLevel);
                }
            }
            return ok;
        }

        public List<string> GetDocumentList()
        {

        }


        public string GetDocument(string documentName, string encryptionPassword)
        {
            string encrypt = _realDocumentManager.GetDocument(documentName, encryptionPassword);
            string decript = Cryptography.Decrypt(encrypt, encryptionPassword);
            return decript;
        }

        #endregion IDocumentManager Members
    }



}