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#region

/* -----------------------------------------------------------------------

 * <copyright file="PreferencesViewModel.cs" company="GRNet">

 * 

 * Copyright 2011-2012 GRNET S.A. All rights reserved.

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 * Redistribution and use in source and binary forms, with or

 * without modification, are permitted provided that the following

 * conditions are met:

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 *      copyright notice, this list of conditions and the following

 *      disclaimer.

 *

 *   2. Redistributions in binary form must reproduce the above

 *      copyright notice, this list of conditions and the following

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 *

 * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

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 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

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#endregion

using System.Collections.Concurrent;

using System.Collections.Generic;

using System.Collections.Specialized;

using System.ComponentModel.Composition;

using System.Diagnostics;

using System.IO;

using System.Net;

using System.Reflection;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Forms;

using Caliburn.Micro;

using Pithos.Client.WPF.Configuration;

using Pithos.Client.WPF.Properties;

using Pithos.Client.WPF.SelectiveSynch;

using Pithos.Client.WPF.Utils;

using Pithos.Core;

using Pithos.Interfaces;

using System;

using System.Linq;

using Pithos.Network;

using MessageBox = System.Windows.MessageBox;

using Screen = Caliburn.Micro.Screen;

namespace Pithos.Client.WPF.Preferences

{

    /// <summary>

    /// The preferences screen displays user and account settings and updates the PithosMonitor

    /// classes when account settings change.

    /// </summary>

    /// <remarks>

    /// The class is a single ViewModel for all Preferences tabs. It can be broken in separate

    /// ViewModels, one for each tab.

    /// </remarks>

    [Export, PartCreationPolicy(CreationPolicy.Shared)]

    public class PreferencesViewModel : Screen

    {

        private readonly IEventAggregator _events;

        //Logging in the Pithos client is provided by log4net

        private static readonly log4net.ILog Log = log4net.LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private PithosSettings _settings;

        public PithosSettings Settings

        {

            get { return _settings; }

            set

            {

                _settings = value;

                NotifyOfPropertyChange(()=>Settings);

            }

        }

        private ObservableConcurrentCollection<AccountViewModel> _accounts;

        public ObservableConcurrentCollection<AccountViewModel> Accounts

        {

            get { return _accounts; }

            set 

            { 

                _accounts = value;

                NotifyOfPropertyChange(()=>Accounts);

            }

        }

        public bool StartOnSystemStartup { get; set; }

        public ShellViewModel Shell { get;  set; }

        //ShellExtensionController _extensionController=new ShellExtensionController();

        public PreferencesViewModel(IWindowManager windowManager, IEventAggregator events, ShellViewModel shell, PithosSettings settings, string currentTab)

        {

            // ReSharper disable DoNotCallOverridableMethodsInConstructor

            //Caliburn.Micro uses DisplayName for the view's title

            DisplayName = "Pithos+ Preferences";

            // ReSharper restore DoNotCallOverridableMethodsInConstructor

            _windowManager = windowManager;

            _events = events;

            Shell = shell;

            Settings=settings;

            Accounts = new ObservableConcurrentCollection<AccountViewModel>();

            if (settings.Accounts == null)

            {

                settings.Accounts=new AccountsCollection();

                settings.Save();

            }

            var accountVMs = from account in settings.Accounts

                             select new AccountViewModel(account);

            Accounts.AddFromEnumerable(accountVMs);

            var startupPath = Environment.GetFolderPath(Environment.SpecialFolder.Startup);

            _shortcutPath = Path.Combine(startupPath, "Pithos.lnk");

            StartOnSystemStartup = File.Exists(_shortcutPath);

            SelectedTab = currentTab;

        }

        private string _selectedTab="General";

        public string SelectedTab

        {

            get { return _selectedTab; }

            set

            {

                _selectedTab = value??"General";

                NotifyOfPropertyChange(()=>SelectedTab);

                NotifyOfPropertyChange(() => AccountTabSelected);

            }

        }

        public bool AccountTabSelected

        {

            get { return _selectedTab == "AccountTab"; }

        }

        #region Preferences Properties

        private bool _noProxy;

        public bool NoProxy

        {

            get { return _noProxy; }

            set

            {

                _noProxy = value;

                NotifyOfPropertyChange(()=>NoProxy);

            }

        }

        private bool _defaultProxy;

        public bool DefaultProxy

        {

            get { return _defaultProxy; }

            set

            {

                _defaultProxy = value;

                NotifyOfPropertyChange(() => DefaultProxy);

            }

        }

        private bool _manualProxy;

        public bool ManualProxy

        {

            get { return _manualProxy; }

            set

            {

                _manualProxy = value;

                NotifyOfPropertyChange(() => ManualProxy);

            }

        }

        #endregion

        public int StartupDelay

        {

            get { return (int) Settings.StartupDelay.TotalMinutes; }

            set

            {

                if (value<0)

                    throw new ArgumentOutOfRangeException("value",Resources.PreferencesViewModel_StartupDelay_Greater_or_equal_to_0);

                Settings.StartupDelay = TimeSpan.FromMinutes(value);

                NotifyOfPropertyChange(()=>StartupDelay);

            }

        }

        #region Commands

        public bool CanSelectiveSyncFolders

        {

            get { return CurrentAccount != null; }

        }

        public void SelectiveSyncFolders()

        {

            //var monitor = Shell.Monitors[CurrentAccount.AccountKey];

            var model = new SelectiveSynchViewModel(/*monitor,*/_events,CurrentAccount.Account,CurrentAccount.ApiKey);

            if (_windowManager.ShowDialog(model) == true)

            {

            }

        }

       /* private bool _networkTracing;

        public bool NetworkTracing

        {

            get { return _networkTracing; }

            set

            {

                _networkTracing = value;

            }

        }*/

        public void RefreshApiKey()

        {

            //_events.Publish(new Notification { Title = "Authorization failed", Message = "Your API Key has probably expired. You will be directed to a page where you can renew it", Level = TraceLevel.Error });

            if (CurrentAccount == null)

                return;

            try

            {

                var name = CurrentAccount.AccountName;

                var loginUri = new Uri(new Uri(CurrentAccount.ServerUrl), "login");

                var credentials = PithosAccount.RetrieveCredentials(loginUri.ToString(),name);

                if (credentials==null)

                    return;

                //The server will return credentials for a different account, not just the current account

                //We need to find the correct account first

                var account = Accounts.First(act => act.AccountName == credentials.UserName && act.ServerUrl == CurrentAccount.ServerUrl);

                account.ApiKey = credentials.Password;                

                account.IsExpired = false;

                Settings.Save();

                TaskEx.Delay(10000).ContinueWith(_ =>Shell.MonitorAccount(account.Account));

                NotifyOfPropertyChange(() => Accounts);

            }

            catch (AggregateException exc)

            {

                string message = String.Format("API Key retrieval failed");

                Log.Error(message, exc.InnerException);

                _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });

            }

            catch (Exception exc)

            {

                string message = String.Format("API Key retrieval failed");

                Log.Error(message, exc);

                _events.Publish(new Notification { Title = "Authorization failed", Message = message, Level = TraceLevel.Error });

            }

        }

        public void OpenLogPath()

        {

            Shell.OpenLogPath();

        }

        public void OpenLogConsole()

        {

            var logView=IoC.Get<LogConsole.LogConsoleViewModel>();            

            _windowManager.ShowWindow(logView);

        }

        public void SaveChanges()

        {

            DoSave();

            TryClose(true);

        }

        public void RejectChanges()

        {

            Settings.Reload();

            TryClose(false);

        }

        public void ApplyChanges()

        {

            DoSave();

        }

        private void DoSave()

        {

            //SetStartupMode();            

            //Ensure we save the settings changes first

            foreach (var account in _accountsToRemove)

            {

                Settings.Accounts.Remove(account);

            }

            foreach (var account in _accountsToAdd)

            {

                Settings.Accounts.Add(account);    

            }

            Settings.Save();

            try

            {

                foreach (var account in _accountsToRemove)

                {

                    Shell.RemoveMonitor(account.ServerUrl, account.AccountName);

                    Shell.RemoveAccountFromDatabase(account);

                }

                foreach (var account in Settings.Accounts)

                {

                    Shell.MonitorAccount(account);

                }

            }                

            finally

            {

                _accountsToRemove.Clear();

                _accountsToAdd.Clear();

            }

            NotifyOfPropertyChange(()=>Settings);

            if (IgnoreCertificateErrors)

                ServicePointManager.ServerCertificateValidationCallback= (sender,certificate,chain,errors)=> true;

            else

            {

                ServicePointManager.ServerCertificateValidationCallback = null;

            }

        }

     /*   public void ChangePithosFolder()

        {

            var browser = new FolderBrowserDialog();

            browser.SelectedPath = Settings.PithosPath;

            var result = browser.ShowDialog((IWin32Window)GetView());

            if (result == DialogResult.OK)

            {

                var newPath = browser.SelectedPath;

                var accountName = CurrentAccount.AccountName;

                var monitor = Shell.Monitors[accountName];

                monitor.Stop();

                Shell.Monitors.Remove(accountName);

                Directory.Move(Settings.PithosPath, newPath);

                Settings.PithosPath = newPath;

                Settings.Save();

                Shell.MonitorAccount(CurrentAccount);

                NotifyOfPropertyChange(() => Settings);                

            }

        }

*/

        readonly List<AccountSettings> _accountsToAdd=new List<AccountSettings>();

       public void AddAccount()

       {

           var wizard = new AddAccountViewModel();

           if (_windowManager.ShowDialog(wizard) == true)

           {

               string selectedPath = wizard.AccountPath;

               var initialRootPath = wizard.ShouldCreateOkeanosFolder?

                   Path.Combine(selectedPath, "Okeanos")

                   :selectedPath;

               var actualRootPath= initialRootPath;

               if (wizard.ShouldCreateOkeanosFolder)

               {

                   int attempt = 1;

                   while (Directory.Exists(actualRootPath) || File.Exists(actualRootPath))

                   {

                       actualRootPath = String.Format("{0} {1}", initialRootPath, attempt++);

                   }

               }

               var account = Accounts.FirstOrDefault(act => act.AccountName == wizard.AccountName && act.ServerUrl == wizard.CurrentServer);

               if (account != null)

               {

                   if (MessageBox.Show("The account you specified already exists. Do you want to update it?", "The account exists") == MessageBoxResult.Yes)

                   {

                       account.ApiKey = wizard.Token;

                       account.IsExpired = false;

                       CurrentAccount = account;

                   }

               }

               else

               {

                   var newAccount = new AccountSettings

                                        {

                                            AccountName = wizard.AccountName,

                                            ServerUrl = wizard.CurrentServer,

                                            ApiKey = wizard.Token,

                                            RootPath = actualRootPath,

                                            IsActive = wizard.IsAccountActive,

                                        };

                   var client = new CloudFilesClient(newAccount.AccountName, newAccount.ApiKey)

                                    {

                                        AuthenticationUrl = newAccount.ServerUrl, UsePithos = true

                                    };

                   client.Authenticate();

                   var dirs = (from container in client.ListContainers(newAccount.AccountName)

                               from dir in client.ListObjects(newAccount.AccountName, container.Name)

                               where container.Name != "trash"

                               select dir)

                               .ToTree()

                               .Select(d=>d.Uri.ToString())

                               .ToArray();

                   newAccount.SelectiveFolders.AddRange(dirs);

                   //TODO:Add the "pithos" container as a default selection                   

                   _accountsToAdd.Add(newAccount);

                   var accountVm = new AccountViewModel(newAccount);

                   (Accounts as IProducerConsumerCollection<AccountViewModel>).TryAdd(accountVm);

                   CurrentAccount = accountVm;

               }

               NotifyOfPropertyChange(() => Accounts);

               NotifyOfPropertyChange(() => Settings);   

           }

       }

/*

        public void AddPithosAccount()

       {

            var credentials=PithosAccount.RetrieveCredentials(null);

            if (credentials == null)

                return;

            var account = Settings.Accounts.FirstOrDefault(act => act.AccountName == credentials.UserName);

            var accountVM = new AccountViewModel(account);

            if (account == null)

            {

                account=new AccountSettings{

                    AccountName=credentials.UserName,

                    ApiKey=credentials.Password

                };

                Settings.Accounts.Add(account);

                accountVM = new AccountViewModel(account);

                (Accounts as IProducerConsumerCollection<AccountViewModel>).TryAdd(accountVM);

            }

            else

            {

                account.ApiKey=credentials.Password;

            }

            //SelectedAccountIndex= Settings.Accounts.IndexOf(account);

            CurrentAccount = accountVM;

            NotifyOfPropertyChange(() => Accounts);

            NotifyOfPropertyChange(()=>Settings);                       

       }

*/

        readonly List<AccountSettings> _accountsToRemove = new List<AccountSettings>();

        public void RemoveAccount()

        {

            Accounts.TryRemove(CurrentAccount);

            _accountsToRemove.Add(CurrentAccount.Account);

            CurrentAccount = null;

            NotifyOfPropertyChange(() => Accounts);

            //NotifyOfPropertyChange("Settings.Accounts");

        }

        public bool CanRemoveAccount

        {

            get { return (CurrentAccount != null); }

        }

        public bool CanClearAccountCache

        {

            get { return (CurrentAccount != null); }

        }

        public void ClearAccountCache()

        {

            if (MessageBoxResult.Yes == MessageBox.Show("You are about to delete all partially downloaded files from the account's cache.\n" +

                            " You will have to download all partially downloaded data again\n" +

                            "This change can not be undone\n\n" +

            "Do you wish to delete all partially downloaded data?", "Warning! Clearing account cache",

                            MessageBoxButton.YesNo,MessageBoxImage.Question,MessageBoxResult.No))

            {

                var cachePath = Path.Combine(CurrentAccount.RootPath, FolderConstants.CacheFolder);

                var dir = new DirectoryInfo(cachePath);

                //The file may not exist if we just created the account

                if (!dir.Exists)

                    return;

                dir.EnumerateFiles().Apply(file=>file.Delete());

                dir.EnumerateDirectories().Apply(folder => folder.Delete(true));

            }

        }

        public bool ExtensionsActivated

        {

            get { return Settings.ExtensionsActivated; }

            set

            {

                if (Settings.ExtensionsActivated == value)

                    return;

                Settings.ExtensionsActivated = value;

/*

                if (value)

                    _extensionController.RegisterExtensions();

                else

                {

                    _extensionController.UnregisterExtensions();

                }

*/

                NotifyOfPropertyChange(() => ExtensionsActivated);

            }

        }

        public bool DebugLoggingEnabled

        {

            get { return Settings.DebugLoggingEnabled; }

            set { 

                Settings.DebugLoggingEnabled = value;

                NotifyOfPropertyChange(()=>DebugLoggingEnabled);

            }

        }

        public bool IgnoreCertificateErrors

        {

            get { return Settings.IgnoreCertificateErrors; }

            set {

                Settings.IgnoreCertificateErrors = value;

                NotifyOfPropertyChange(() => IgnoreCertificateErrors);

            }

        }

        #endregion

       /* private int _selectedAccountIndex;

        public int SelectedAccountIndex

        {

            get { return _selectedAccountIndex; }

            set

            {

                //var accountCount=Settings.Accounts.Count;

                //if (accountCount == 0)

                //    return;

                //if (0 <= value && value < accountCount)

                //    _selectedAccountIndex = value;

                //else

                //    _selectedAccountIndex = 0;

                _selectedAccountIndex = value;

                NotifyOfPropertyChange(() => CurrentAccount);

                NotifyOfPropertyChange(() => CanRemoveAccount);

                NotifyOfPropertyChange(()=>SelectedAccountIndex);

            }

        }*/

        private AccountViewModel _currentAccount;

        private readonly IWindowManager _windowManager;

        private readonly string _shortcutPath;

        public AccountViewModel CurrentAccount

        {

            get { return _currentAccount; }

            set

            {

                _currentAccount = value;

                NotifyOfPropertyChange(()=>CurrentAccount);

                NotifyOfPropertyChange(() => CanRemoveAccount);

                NotifyOfPropertyChange(() => CanSelectiveSyncFolders);

                NotifyOfPropertyChange(() => CanMoveAccountFolder);

                NotifyOfPropertyChange(() => CanClearAccountCache);

            }

        }

/*

        public AccountSettings CurrentAccount

        {

            get {

                if (0 <= SelectedAccountIndex && SelectedAccountIndex < Settings.Accounts.Count)                    

                    return Settings.Accounts[SelectedAccountIndex];

                return null;

            }

        }

*/

        public bool CanMoveAccountFolder

        {

            get { return CurrentAccount != null; }

        }

    public void MoveAccountFolder()

    {

        using (var dlg = new FolderBrowserDialog())

        {

            var currentFolder = CurrentAccount.RootPath;

            dlg.SelectedPath = currentFolder;

            //Ask the user to select a folder

            //Note: We need a parent window here, which we retrieve with GetView            

            var view = (Window)GetView();            

            if (DialogResult.OK != dlg.ShowDialog(new Wpf32Window(view)))

                return;            

            var newPath= dlg.SelectedPath;                

            //Find the account's monitor and stop it

            PithosMonitor monitor;

            if (Shell.Monitors.TryGetValue(CurrentAccount.AccountKey, out monitor))

            {

                monitor.Stop();

                var oldPath = monitor.RootPath;

                //The old directory may not exist eg. if we create an account for the first time

                if (Directory.Exists(oldPath))

                {

                    //If it does, do the move

                    //Now Create all of the directories

                    foreach (string dirPath in Directory.EnumerateDirectories(oldPath, "*",

                                                           SearchOption.AllDirectories))

                        Directory.CreateDirectory(dirPath.Replace(oldPath, newPath));

                    //Copy all the files

                    foreach (string newFilePath in Directory.EnumerateFiles(oldPath, "*.*",

                                                                            SearchOption.AllDirectories))

                        File.Copy(newFilePath, newFilePath.Replace(oldPath, newPath));

                    Log.InfoFormat("Deleting account folder {0}",oldPath);

                    Directory.Delete(oldPath, true);

                    //We also need to change the path of the existing file states

                    monitor.MoveFileStates(oldPath, newPath);

                }

            }

            //Replace the old rootpath with the new

            CurrentAccount.RootPath = newPath;

            //TODO: This will save all settings changes. Too coarse grained, need to fix at a later date

            Settings.Save();            

            //And start the monitor on the new RootPath            

            if (monitor != null)

            {

                monitor.RootPath = newPath;

                if (CurrentAccount.IsActive)

                    monitor.Start();

            }

            else

                Shell.MonitorAccount(CurrentAccount.Account);

            //Finally, notify that the Settings, CurrentAccount have changed

            NotifyOfPropertyChange(() => CurrentAccount);

            NotifyOfPropertyChange(() => Settings);

        }

    }

    }

}