/*  
	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at
	
	http://www.apache.org/licenses/LICENSE-2.0
	
	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.
*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using System.IO.IsolatedStorage;
using System.Windows.Resources;
using System.Windows.Interop;
using System.Runtime.Serialization.Json;
using System.IO;
using System.ComponentModel;
using System.Xml.Linq;
using WP7CordovaClassLib.Cordova.Commands;
using System.Diagnostics;
using System.Text;
using WP7CordovaClassLib.Cordova;
using System.Threading;
using Microsoft.Phone.Shell;


namespace WP7CordovaClassLib
{
    public partial class CordovaView : UserControl
    {
       
        /// <summary>
        /// Indicates whether web control has been loaded and no additional initialization is needed.
        /// Prevents data clearing during page transitions.
        /// </summary>
        private bool IsBrowserInitialized = false;
        
        /// <summary>
        /// Set when the user attaches a back button handler inside the WebBrowser
        /// </summary>
        private bool OverrideBackButton = false;

        /// <summary>
        /// Used for keeping track of our history
        /// </summary>
        private Stack<Uri> history = new Stack<Uri>();
        private bool IsBackButtonPressed = false;


        private static string AppRoot = "/app/";


        /// <summary>
        /// Handles native api calls
        /// </summary>
        private NativeExecution nativeExecution;

        protected DOMStorageHelper domStorageHelper;
        protected OrientationHelper orientationHelper;

        public System.Windows.Controls.Grid _LayoutRoot
        {
            get
            {
                return ((System.Windows.Controls.Grid)(this.FindName("LayoutRoot")));
            }
        }

        public WebBrowser Browser
        {
            get
            {
                return CordovaBrowser;
            }
        }

        /*
         * Setting StartPageUri only has an effect if called before the view is loaded.
         **/
        protected Uri _startPageUri = null;
        public Uri StartPageUri
        {
            get
            {
                if (_startPageUri == null)
                {
                    // default
                    return new Uri( AppRoot + "www/index.html", UriKind.Relative);                    
                }
                else
                {
                    return _startPageUri;
                }
            }
            set
            {
                if (!this.IsBrowserInitialized)
                {
                    _startPageUri = value;
                }
            }
        }

        public CordovaView()
        {
            
            InitializeComponent();

            if (DesignerProperties.IsInDesignTool)
            {
                return;
            }


            StartupMode mode = PhoneApplicationService.Current.StartupMode;

            if (mode == StartupMode.Launch)
            {
                PhoneApplicationService service = PhoneApplicationService.Current;
                service.Activated += new EventHandler<Microsoft.Phone.Shell.ActivatedEventArgs>(AppActivated);
                service.Launching += new EventHandler<LaunchingEventArgs>(AppLaunching);
                service.Deactivated += new EventHandler<DeactivatedEventArgs>(AppDeactivated);
                service.Closing += new EventHandler<ClosingEventArgs>(AppClosing);
            }
            else
            {

            }

            // initializes native execution logic
            this.nativeExecution = new NativeExecution(ref this.CordovaBrowser);
        }

        
        void AppClosing(object sender, ClosingEventArgs e)
        {
            Debug.WriteLine("AppClosing");
        }

        void AppDeactivated(object sender, DeactivatedEventArgs e)
        {
            Debug.WriteLine("AppDeactivated");

            try
            {
                CordovaBrowser.InvokeScript("CordovaCommandResult", new string[] { "pause" });
            }
            catch (Exception)
            {
                Debug.WriteLine("Pause event error");
            } 
        }

        void AppLaunching(object sender, LaunchingEventArgs e)
        {
            Debug.WriteLine("AppLaunching");
        }

        void AppActivated(object sender, Microsoft.Phone.Shell.ActivatedEventArgs e)
        {
            Debug.WriteLine("AppActivated");
            try
            {
                CordovaBrowser.InvokeScript("CordovaCommandResult", new string[] { "resume" });
            }
            catch (Exception)
            {
                Debug.WriteLine("Resume event error");
            }  
        }

        void GapBrowser_Loaded(object sender, RoutedEventArgs e)
        {
            if (DesignerProperties.IsInDesignTool)
            {
                return;
            }

            // prevents refreshing web control to initial state during pages transitions
            if (this.IsBrowserInitialized) return;

            this.domStorageHelper = new DOMStorageHelper(this.CordovaBrowser);

            try
            {

                // Before we possibly clean the ISO-Store, we need to grab our generated UUID, so we can rewrite it after.
                string deviceUUID = "";

                using (IsolatedStorageFile appStorage = IsolatedStorageFile.GetUserStoreForApplication())
                {
                    try
                    {
                        IsolatedStorageFileStream fileStream = new IsolatedStorageFileStream("DeviceID.txt", FileMode.Open, FileAccess.Read, appStorage);

                        using (StreamReader reader = new StreamReader(fileStream))
                        {
                            deviceUUID = reader.ReadLine();
                        }
                    }
                    catch (Exception /*ex*/)
                    {
                        deviceUUID = Guid.NewGuid().ToString();
                    }

                    Debug.WriteLine("Updating IsolatedStorage for APP:DeviceID :: " + deviceUUID);
                    IsolatedStorageFileStream file = new IsolatedStorageFileStream("DeviceID.txt", FileMode.Create, FileAccess.Write, appStorage);
                    using (StreamWriter writeFile = new StreamWriter(file))
                    {
                        writeFile.WriteLine(deviceUUID);
                        writeFile.Close();
                    }
   
                }

                StreamResourceInfo streamInfo = Application.GetResourceStream(new Uri("CordovaSourceDictionary.xml", UriKind.Relative));

                if (streamInfo != null)
                {
                    StreamReader sr = new StreamReader(streamInfo.Stream);
                    //This will Read Keys Collection for the xml file

                    XDocument document = XDocument.Parse(sr.ReadToEnd());

                    var files = from results in document.Descendants("FilePath")
                                 select new
                                 {
                                     path =  (string)results.Attribute("Value")
                                 };
                    StreamResourceInfo fileResourceStreamInfo;

                    using (IsolatedStorageFile appStorage = IsolatedStorageFile.GetUserStoreForApplication())
                    {

                        foreach (var file in files)
                        {
                            fileResourceStreamInfo = Application.GetResourceStream(new Uri(file.path, UriKind.Relative));

                            if (fileResourceStreamInfo != null)
                            {
                                using (BinaryReader br = new BinaryReader(fileResourceStreamInfo.Stream))
                                {
                                    byte[] data = br.ReadBytes((int)fileResourceStreamInfo.Stream.Length);

                                    string strBaseDir = AppRoot + file.path.Substring(0, file.path.LastIndexOf(System.IO.Path.DirectorySeparatorChar));

                                    if(!appStorage.DirectoryExists(strBaseDir))
                                    {
                                        //Debug.WriteLine("Creating Directory :: " + strBaseDir);
                                        appStorage.CreateDirectory(strBaseDir);
                                    }

                                    // This will truncate/overwrite an existing file, or 
                                    using (IsolatedStorageFileStream outFile = appStorage.OpenFile(AppRoot + file.path, FileMode.Create))
                                    {
                                        Debug.WriteLine("Writing data for " + AppRoot + file.path + " and length = " + data.Length);
                                        using (var writer = new BinaryWriter(outFile))
                                        {
                                            writer.Write(data);
                                        }
                                    }
                                }
                            }
                            else
                            {
                                Debug.WriteLine("Failed to write file :: " + file.path + " did you forget to add it to the project?");
                            }
                        }
                    }
                }

                CordovaBrowser.Navigate(StartPageUri);
                IsBrowserInitialized = true;
                AttachHardwareButtonHandlers();
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Exception in GapBrowser_Loaded :: {0}", ex.Message);
            }
        }

        void AttachHardwareButtonHandlers()
        {
            PhoneApplicationFrame frame = Application.Current.RootVisual as PhoneApplicationFrame;
            if (frame != null)
            {
                PhoneApplicationPage page = frame.Content as PhoneApplicationPage;
                 
                if (page != null)
                {
                    page.BackKeyPress += new EventHandler<CancelEventArgs>(page_BackKeyPress);

                    this.orientationHelper = new OrientationHelper(this.CordovaBrowser, page); 

                }
            }
        }

        void page_BackKeyPress(object sender, CancelEventArgs e)
        {
            if (OverrideBackButton)
            {
                try
                {
                    CordovaBrowser.InvokeScript("CordovaCommandResult", new string[] { "backbutton" });
                    e.Cancel = true;
                }
                catch (Exception ex)
                {
                    Console.WriteLine("Exception while invoking backbutton into cordova view: " + ex.Message);
                }
            }
            else
            {
                if (history.Count > 1)
                {
                    history.Pop();
                    Uri next = history.Peek();
                    IsBackButtonPressed = true;
                    CordovaBrowser.Navigate(next);
                    e.Cancel = true;
                }
            }
        }

        void GapBrowser_LoadCompleted(object sender, System.Windows.Navigation.NavigationEventArgs e)
        {
            this.CordovaBrowser.Opacity = 1;

            string nativeReady = "(function(){ cordova.require('cordova/channel').onNativeReady.fire()})();";

            try
            {
                CordovaBrowser.InvokeScript("execScript", new string[] { nativeReady });
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Error calling js to fire nativeReady event :: " + ex.Message);
            }
        }


        void GapBrowser_Navigating(object sender, NavigatingEventArgs e)
        {
            if (!IsBackButtonPressed)
            {
                history.Push(e.Uri);
            }
            else
            {
                IsBackButtonPressed = false;
            }

            Debug.WriteLine("GapBrowser_Navigating to :: " + e.Uri.ToString());
            // TODO: tell any running plugins to stop doing what they are doing.
            // TODO: check whitelist / blacklist
            // NOTE: Navigation can be cancelled by setting :        e.Cancel = true;


        }

        /*
         *  This method does the work of routing commands
         *  NotifyEventArgs.Value contains a string passed from JS 
         *  If the command already exists in our map, we will just attempt to call the method(action) specified, and pass the args along
         *  Otherwise, we create a new instance of the command, add it to the map, and call it ...
         *  This method may also receive JS error messages caught by window.onerror, in any case where the commandStr does not appear to be a valid command
         *  it is simply output to the debugger output, and the method returns.
         * 
         **/
        void GapBrowser_ScriptNotify(object sender, NotifyEventArgs e)
        {
            string commandStr = e.Value;

            Debug.WriteLine("ScriptNotify::" + commandStr);

            // DOMStorage/Local OR DOMStorage/Session
            if (commandStr.IndexOf("DOMStorage") == 0)
            {
                this.domStorageHelper.HandleStorageCommand(commandStr);
                return;
            }
            else if (commandStr.IndexOf("Orientation") == 0)
            {
                this.orientationHelper.HandleCommand(commandStr);
                return;
            }

            CordovaCommandCall commandCallParams = CordovaCommandCall.Parse(commandStr);
            
            if (commandCallParams == null)
            {
                // ERROR
                Debug.WriteLine("ScriptNotify :: " + commandStr);
            }
            else if (commandCallParams.Service == "CoreEvents")
            {
                switch (commandCallParams.Action.ToLower())
                {
                    case "overridebackbutton":
                        string args = commandCallParams.Args;
                        this.OverrideBackButton = (args != null && args.Length > 0 && args == "true");
                        break;
                }
            }
            else
            {
                //Debug.WriteLine("ProcessCommand :: " + commandStr);
                this.nativeExecution.ProcessCommand(commandCallParams);
            }
        }

        private void GapBrowser_Unloaded(object sender, RoutedEventArgs e)
        {

        }

        private void GapBrowser_NavigationFailed(object sender, System.Windows.Navigation.NavigationFailedEventArgs e)
        {
            Debug.WriteLine("GapBrowser_NavigationFailed :: " + e.Uri.ToString());
        }

        private void GapBrowser_Navigated(object sender, System.Windows.Navigation.NavigationEventArgs e)
        {
            Debug.WriteLine("GapBrowser_Navigated :: " + e.Uri.ToString());
        }

       
    }
}