using Microsoft.WindowsAPICodePack.Taskbar;
using Client.Config;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using Client.Utils;
using System.IO;
using CefSharp;

namespace CMS_Client.View
{
    public partial class LoadingForm : Form
    {
        public const int TimerTest = 2000;
        private HttpWebRequest ConnTestRequest;
        private HttpWebResponse ConnTestResponse;
        private String ConnTestError;
        private Task ConnTask;

        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        #region WINDOW_START_&_BEHAVIOUR_METHOD

        //Constructor
        public LoadingForm()
        {
            InitializeComponent();
        }



        //OnLoad Method
        private void LoadingForm_Load(object sender, EventArgs e)
        {
            //Force on Desktop 1
            this.DesktopLocation = new Point((Screen.PrimaryScreen.Bounds.Width / 2) - (this.Width / 2), (Screen.PrimaryScreen.Bounds.Height / 2) - (this.Height / 2));
            
            //Start Backgroud Task
            ConnTask = Task.Run(() => BagroundWorker());

            //Setup product label
            if(Environment.Is64BitProcess)
                VersionLBL.Text = Application.ProductName + " V" + Application.ProductVersion + " - 64 Bit";
            else
                VersionLBL.Text = Application.ProductName + " V" + Application.ProductVersion + " - 32 Bit";
        }



        //Set the status & Messages Labels
        private void setStatus(String status, String Error)
        {
            //Invoke method if is needed or call the method in STD mode
            if (this.InvokeRequired)
            {
                this.Invoke((MethodInvoker)delegate () { StatusLBL.Text = status; });
                this.Invoke((MethodInvoker)delegate () { ErrorLBL.Text = Error; });
            }
            else
            {
                StatusLBL.Text = status;
                ErrorLBL.Text = Error;
            }
        }



        //Close the Window
        private void closeWindow()
        {
            //Invoke method if is needed or call the method in STD mode
            if (this.InvokeRequired)
                this.Invoke((MethodInvoker)delegate () { this.Close(); });
            else
                this.Close();
        }



        //Method used to add the shadow to the Window
        protected override CreateParams CreateParams
        {
            get
            {
                const int CS_DROPSHADOW = 0x20000;
                CreateParams cp = base.CreateParams;
                cp.ClassStyle |= CS_DROPSHADOW;
                return cp;
            }
        }

        #endregion

        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        #region CONNECTING_TASK_METHOD

        //Main Void of the background Task
        private void BagroundWorker()
        {
            //Show the loading state on the app ICON            
            this.Invoke((MethodInvoker)delegate () {TaskbarManager.Instance.SetProgressState(TaskbarProgressBarState.Indeterminate, this.Handle); });

            //Read the Configuration
            if (!readConfiguration())
                return;

            //try to Request  
            setStatus("Connecting to " + Config.ConnectionConfig.Url + "...", "");
            do { } while (!testConnection(new Uri(Config.ConnectionConfig.Url))) ;

            //Open Nc Window
            setStatus("Opening the NC Window... ", "");
            
            if (Config.VendorHmiConfig.Enabled)
                if (!OpenNcWindow())
                    return;
            
            //Setup The Browser
            if (!SetupBrowser())
                return;

            //Close the Window
            closeWindow();         
        }



        //Sub-Method used to SetupThe Browser Environment
        private bool SetupBrowser()
        {
            //Delete Browser Cache
            try
            {
                if (Config.ConnectionConfig.DeleteCahceFolderOnStartup && Directory.Exists(Constants.BROWSER_CACHE_FOLDER))
                {
                    setStatus("Deleting Browser Chache Folder...", "");
                    Directory.Delete(Constants.BROWSER_CACHE_FOLDER, true);
                }

            }
            catch (Exception E)
            {
                setStatus("Close the application!", E.Message);
                return false;
            }

            return true;
        }



        //Sub-Method used to read the configuration
        private bool readConfiguration()
        {   
            //Set the Status Variable
            setStatus("Reading Configuration...", "");

            //Read the Config
            try
            {
                ConfigController.ReadStartupConfig();
                setStatus("Configuration ok!", "");
                return true;
            }
            catch (Exception E)
            {
                setStatus("Close the application!", E.Message);
                return false;

            }
        }


        //Sub-Method used to test the connection
        private bool testConnection(Uri url)
        {
            Boolean Connected = false;

            //Try to connect
            try
            {
                ConnTestRequest = (HttpWebRequest)WebRequest.Create(url);
                ConnTestRequest.Timeout = (int)(TimerTest);
                ConnTestRequest.KeepAlive = false;
                ConnTestResponse = (HttpWebResponse)ConnTestRequest.GetResponse();
                ConnTestError = ConnTestResponse.StatusCode.ToString();
                Connected = (ConnTestResponse.StatusCode == HttpStatusCode.OK) ? true : false;
            }
            catch (WebException ex)
            {
                Connected = false;
                ConnTestError = ex.Status.ToString();
            }

            //Check if it's connected
            if (Connected)
            {
                setStatus("Connected!", "");
                return true;
            }
            else
            {
                setStatus("Retry connection to: " + Config.ConnectionConfig.Url, "Server not found (Error:" + ConnTestError + ")");
                return false;
            }
        }



        //Sub-Method used to open the NC Window
        private bool OpenNcWindow()
        {
            switch(NcWindow.StartNcWindow())
            {
                case 0: return true;

                case 1: {
                        setStatus("Close the application!", "NC Path not found: " + NcWindow.ProcessPath);
                        return false;
                        };

                case 2:
                    {
                        setStatus("Close the application!", "Unable to start the NC application: ");
                        return false;
                    };
            }
            return false;
        }


        #endregion

        ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
        #region CLOSE_BUTTON_BEHAVIUR

        //On click Method
        private void CloseLabel_Click(object sender, EventArgs e)
        {
            Environment.Exit(0);
        }



        //On Mouse Enter
        private void CloseLabel_MouseEnter(object sender, EventArgs e)
        {
            CloseLabel.ForeColor = Color.DarkRed;
        }



        //On Mouse Leave
        private void CloseLabel_MouseLeave(object sender, EventArgs e)
        {
            CloseLabel.ForeColor = Color.White;
        }
        #endregion
    }
}