using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Windows.Input;
using RGBController2.Commands;
using RGBController2.ViewModels.Tabs;
using RGBController2.ViewModels.Dialogs;
using System.ComponentModel;
using System.Windows;
using System.Xml;

namespace RGBController2.ViewModels
{
    class MainViewModel
    {
        private readonly ObservableCollection<Tab> _tabs;
        public ICommand NewTabCommand { get; }
        public static ICollection<Tab> Tabs { get; set; }

        public MainViewModel()
        {
            NewTabCommand = new ActionCommand(p => NewTab());

            _tabs = new ObservableCollection<Tab>();
            _tabs.CollectionChanged += Tabs_CollectionChanged;

            Tabs = _tabs;

            // Check here that the config file exists

            // Load the config file
            using (XmlReader reader = XmlReader.Create("config.xml"))
            {
                string name = "";
                string type = "";
                while (reader.Read())
                {
                    if (reader.IsStartElement())
                    {
                        //return only when you have START tag  
                        switch (reader.Name.ToString())
                        {
                            case "name":
                                name = reader.ReadString();
                                break;
                            case "type":
                                type = reader.ReadString();
                                break;
                        }
                    }
                    // Create the tab here
                    if (name != "" && type != "")
                    {
                        switch(type)
                        {
                            case "arduino":
                                _tabs.Add(new ArduinoTab(name));
                                break;
                            case "cue":
                                _tabs.Add(new CueDeviceTab(name));
                                break;
                        }

                        name = "";
                        type = "";
                    }
                }
            }
        }

        private void Tabs_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            ITab tab;

            switch (e.Action)
            {
                case NotifyCollectionChangedAction.Add:
                    tab = (ITab) e.NewItems[0];
                    tab.CloseRequested += OnTabCloseRequested;
                    break;
                case NotifyCollectionChangedAction.Remove:
                    tab = (ITab) e.OldItems[0];
                    tab.CloseRequested -= OnTabCloseRequested;
                    break;
            }
          
        }

        private void OnTabCloseRequested(object sender, EventArgs e)
        {
            Tabs.Remove((Tab) sender);
        }

        private void NewTab()
        {
            // Open the add tab dialog
            var dialog = new NewTabDialogViewModel();
            dialog.ShowDialogWindow();

            // Use the results from the dialog when creating the new tab
            if (dialog.Success)
            {
                switch(dialog.SelectedDeviceType)
                {
                    case 0: // Arduino
                        Tabs.Add(new ArduinoTab(dialog.DeviceName));
                        break;
                    case 1:
                        Tabs.Add(new CueDeviceTab(dialog.DeviceName));
                        break;
                }
            }
        }

        /// <summary>
        /// This function is called when the application is closed.
        /// This allows the configuration to be saved to disk.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void OnWindowClosing(object sender, CancelEventArgs e)
        {
            // ToDo - Save the config to disk
            // This may need to be saved somwhere better, for now we will just save it
            // with the executable
            XmlWriter xmlWriter = XmlWriter.Create("config.xml");
            xmlWriter.WriteStartDocument();

            xmlWriter.WriteStartElement("tabs");
            xmlWriter.WriteAttributeString("count", Tabs.Count.ToString());
            foreach (var tab in Tabs)
            {
                xmlWriter.WriteStartElement("tab");
                xmlWriter.WriteStartElement("name");
                xmlWriter.WriteString(tab.Name);
                xmlWriter.WriteEndElement();

                switch (tab.TabType)
                {
                    case Tab.tabType.Arduino:
                        xmlWriter.WriteStartElement("type");
                        xmlWriter.WriteString("arduino");
                        xmlWriter.WriteEndElement();
                        break;
                    case Tab.tabType.CUE:
                        xmlWriter.WriteStartElement("type");
                        xmlWriter.WriteString("cue");
                        xmlWriter.WriteEndElement();
                        break;
                }
                xmlWriter.WriteEndElement();
            }

            xmlWriter.WriteEndDocument();
            xmlWriter.Close();


        }

    }
}