using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using WebControls.HLAdminService;
using Wintellect.PowerCollections;
using System.Collections;

namespace WebControls {
  // Class that implement the IComparer interface
  // this is taken to sort the list ascending
  class CompAsc : IComparer {
    // Implement the IComparable interface. 
    public int Compare(object obj1, object obj2) {
      ListItem a, b;
      a = (ListItem)obj1;
      b = (ListItem)obj2;
      
      return a.Text.CompareTo(b.Text);
    }
  }

  // Class that implement the IComparer interface
  // this is taken to sort the list descending
  class CompDsc : IComparer {
    public int Compare(object obj1, object obj2) {
      ListItem a, b;
      a = (ListItem)obj1;
      b = (ListItem)obj2;
      return b.Text.CompareTo(a.Text);
    }
  }

  public partial class OKBNamedItemList : System.Web.UI.UserControl {

    // delegate for the selectedIndexChanged
    public delegate void OKBSelectedIndexChangedDelegate(Object sender, EventArgs e);

    //event for the selected index changed
    public event OKBSelectedIndexChangedDelegate OKBSelectedIndexChanged;

    // global list of NAmedOKBItem the will show the items from this list
    public static IList<NamedOKBItem> namedOKBItemList;
    // enum to switch between the orderstate
    public enum orderState { ascending, descending }
    // orderstate variable
    public static orderState ordered;
    // List of the ItemList for the listcontrol
    public static ArrayList ItemsList;

    // selectedindex of the list
    private  int selectedIndex;

    // selectedvalue of the list
    private string selectedValue;

    /// <summary>
    /// is always executed on page load
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Page_Load(object sender, EventArgs e) {
      // if width or height not set, then set default width and height
      if (UCWidth == null) {
        UCWidth = "100%";
      }
      if (UCHeight == null) {
        UCHeight = "100%";
      }

      // set the size of the whole control
      this.Panel1.Width = new Unit(UCWidth);
      this.Panel1.Height = new Unit(UCHeight);

      // if the control is reload after any action
      if (IsPostBack) {
        // restore the data of the namedOKBITemList from viewstate
        namedOKBItemList = (IList<NamedOKBItem>)ViewState["namedOKBItemList"];
        // restore the data of the selected index from viewstate
        this.selectedIndex = (int)ViewState["selectedIndex"];
        // restore the data of the selected value from the viewstate
        this.selectedValue = (string)ViewState["selectedValue"];
        // restore the data of the selectedNamedOKBItem
        this.SelectedNamedOKBItem = (NamedOKBItem)ViewState["selectedNamedOKBItem"];
      } else {
        // default orderstate
        ordered = orderState.ascending;
        // default selectedindex
        this.selectedIndex = -1;
        // default selected value
        this.selectedValue = "";
        // store the settings in the viewstate
        ViewState["selectedIndex"] = this.selectedIndex;
        ViewState["selectedValue"] = this.selectedValue;
      }
    }

    /// <summary>
    /// set the datalist for this control
    /// it will take a List of NamedOKBItem
    /// and the control do all other for you
    /// </summary>
    /// <param name="okbList">list of NamedOKBItem</param>
    public void setNamedOKBItemList(IList<NamedOKBItem> okbList) {
      namedOKBItemList = okbList;
      // store it in the viewstate
      ViewState["namedOKBItemList"] = namedOKBItemList;
      // execute the fillItemList methode to fill the values and id's in the Listcontrol
      fillItemList();
    }

    // get the List of NamedOKBItem
    public IList<NamedOKBItem> getNamedOKBItemList() {
      return namedOKBItemList;
    }

    /// <summary>
    /// this methode take the List of NamedOKBItems and fill it in the Listcontrol
    /// 
    /// </summary>
    public void fillItemList() {
      // Comparer for the list
      IComparer comp = null;
      // allocate new ArrayList
      ItemsList = new ArrayList();
      // clear old Items from List Control
      lb_NamedOKBItems.Items.Clear();
      // choose between the orderstate
      if (ordered == orderState.ascending) {
        comp = new CompAsc();
      } else {
        comp = new CompDsc();
      }
      // fill the list
      if (namedOKBItemList != null) {
        foreach (NamedOKBItem noi in namedOKBItemList) {
          ListItem lItem = new ListItem(noi.Name, noi.Id.ToString());
          ItemsList.Add(lItem);
        }
        // sort with the right comparer
        ItemsList.Sort(comp);
      }
      foreach (ListItem li in ItemsList) {
        lb_NamedOKBItems.Items.Add(li);
      }
      // at last bind the data
      lb_NamedOKBItems.DataBind();
    }

    /// <summary>
    /// this is the methode that will called when the ascending button is clicked
    /// here the selected item will be stored in the global varaible
    /// after the sort the selecteditem will again marked as select
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void btn_Ascending_Click(object sender, EventArgs e) {
      ordered = orderState.ascending;
      ListItem selectedItem = null;
      if (namedOKBItemList != null) {
        if (lb_NamedOKBItems.SelectedIndex != -1) {
          selectedItem = lb_NamedOKBItems.SelectedItem;
          
        }
        fillItemList();
        if (selectedItem != null) {
          int index = lb_NamedOKBItems.Items.IndexOf(selectedItem);
          lb_NamedOKBItems.SelectedIndex = index;
        }
        
      }
    }


    /// <summary>
    /// this is the methode that will called when the descending button is clicked
    /// here the selected item will be stored in the global varaible
    /// after the sort the selecteditem will again marked as select
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void tn_Descending_Click(object sender, EventArgs e) {
      ordered = orderState.descending;
      ListItem selectedItem = null;
      if (namedOKBItemList != null) {
        if (lb_NamedOKBItems.SelectedIndex != -1) {
          selectedItem = lb_NamedOKBItems.SelectedItem;
        }
        fillItemList();
        if (selectedItem != null) {
          int index = lb_NamedOKBItems.Items.IndexOf(selectedItem);
          lb_NamedOKBItems.SelectedIndex = index;
        }
      }
      
    }

    /// <summary>
    /// this methode is called when the index is changed
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void lb_NamedOKBItems_SelectedIndexChanged(object sender, EventArgs e) {
      if (lb_NamedOKBItems.SelectedIndex == -1) {
        this.SelectedNamedOKBItem = null;
        
      } else {
        long id;
        long.TryParse(lb_NamedOKBItems.SelectedValue, out id);
        this.SelectedNamedOKBItem = namedOKBItemList.Where(x => x.Id == id).FirstOrDefault();
 
      }
      ViewState["selectedNamedOKBItem"] = this.SelectedNamedOKBItem;
      this.selectedIndex = lb_NamedOKBItems.SelectedIndex;
      this.selectedValue = lb_NamedOKBItems.SelectedValue;
      ViewState["selectedIndex"] = this.selectedIndex;
      ViewState["selectedValue"] = this.selectedValue;
      if (OKBSelectedIndexChanged != null) {
        OKBSelectedIndexChanged(this, EventArgs.Empty); 
      }
      
    }

    public NamedOKBItem SelectedNamedOKBItem { get; private set; }

    // prpoerties for the controlsize
    private string UCWidth;
    private string UCHeight;

    public string Width { get { return UCWidth; } set { UCWidth = value; } }
    public string Height { get { return UCHeight; } set { UCHeight = value; } }

  }
}