using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections.Specialized;
//using System.Data.SqlClient;
namespace CoreSavingLibrary
{
    public class DynamicallyTemplatedGridViewHandler : ITemplate
    {
        #region data memebers

        ListItemType ItemType;
        string FieldName;
        string InfoType;

        #endregion

        #region constructor

        public DynamicallyTemplatedGridViewHandler(ListItemType item_type, string field_name, string info_type)
        {
            ItemType = item_type;
            FieldName = field_name;
            InfoType = info_type;
        }

        #endregion

        #region Methods

        public void InstantiateIn(System.Web.UI.Control Container)
        {
            switch (ItemType)
            {
                case ListItemType.Header:
                    Literal header_ltrl = new Literal();
                    header_ltrl.Text = "<b>" + FieldName + "</b>";
                    Container.Controls.Add(header_ltrl);
                    break;
                case ListItemType.Item:
                    switch (InfoType)
                    {
                        case "Command":
                            ImageButton edit_button = new ImageButton();
                            edit_button.ID = "edit_button";
                            edit_button.ImageUrl = "/" + WebUtil.coreURI + "/" + WebUtil.coreSubURI + "/Saving/Image/edit.gif";
                            edit_button.CommandName = "Edit";
                            edit_button.Click += new ImageClickEventHandler(edit_button_Click);
                            edit_button.ToolTip = "Edit";
                            Container.Controls.Add(edit_button);

                            ImageButton delete_button = new ImageButton();
                            delete_button.ID = "delete_button";
                            delete_button.ImageUrl = "/" + WebUtil.coreURI + "/" + WebUtil.coreSubURI + "/Saving/Image/delete.gif";
                            delete_button.CommandName = "Delete";
                            delete_button.ToolTip = "Delete";
                            delete_button.OnClientClick = "return confirm('Are you sure to delete the record?')";
                            Container.Controls.Add(delete_button);

                            /* Similarly add button for insert.
                             * It is important to know when 'insert' button is added 
                             * its CommandName is set to "Edit"  like that of 'edit' button 
                             * only because we want the GridView enter into Edit mode, 
                             * and this time we also want the text boxes for corresponding fields empty*/
                            ImageButton insert_button = new ImageButton();
                            insert_button.ID = "insert_button";
                            insert_button.ImageUrl = "/" + WebUtil.coreURI + "/" + WebUtil.coreSubURI + "/Saving/Image/insert.bmp";
                            insert_button.CommandName = "Edit";
                            insert_button.ToolTip = "Insert";
                            insert_button.Click += new ImageClickEventHandler(insert_button_Click);
                            Container.Controls.Add(insert_button);

                            break;

                        default:
                            Label field_lbl = new Label();
                            field_lbl.ID = FieldName;
                            field_lbl.Text = String.Empty; //we will bind it later through 'OnDataBinding' event
                            field_lbl.DataBinding += new EventHandler(OnDataBinding);
                            Container.Controls.Add(field_lbl);
                            break;

                    }
                    break;
                case ListItemType.EditItem:
                    if (InfoType == "Command")
                    {
                        ImageButton update_button = new ImageButton();
                        update_button.ID = "update_button";
                        update_button.CommandName = "Update";
                        update_button.ImageUrl = "/" + WebUtil.coreURI + "/" + WebUtil.coreSubURI + "/Saving/Image/update.gif";
                        if ((int)new Page().Session["InsertFlag"] == 1)
                            update_button.ToolTip = "Add";
                        else
                            update_button.ToolTip = "Update";
                        update_button.OnClientClick = "return confirm('Are you sure to update the record?')";
                        Container.Controls.Add(update_button);

                        ImageButton cancel_button = new ImageButton();
                        cancel_button.ImageUrl = "/" + WebUtil.coreURI + "/" + WebUtil.coreSubURI + "/Saving/Image/cancel.gif";
                        cancel_button.ID = "cancel_button";
                        cancel_button.CommandName = "Cancel";
                        cancel_button.ToolTip = "Cancel";
                        Container.Controls.Add(cancel_button);

                    }
                    else// for other 'non-command' i.e. the key and non key fields, bind textboxes with corresponding field values
                    {
                        TextBox field_txtbox = new TextBox();
                        field_txtbox.ID = FieldName;
                        field_txtbox.Text = String.Empty;
                        // if Inert is intended no need to bind it with text..keep them empty
                        if ((int)new Page().Session["InsertFlag"] == 0)
                            field_txtbox.DataBinding += new EventHandler(OnDataBinding);
                        Container.Controls.Add(field_txtbox);

                    }
                    break;

            }

        }

        #endregion

        #region Event Handlers

        //just sets the insert flag ON so that we ll be able to decide in OnRowUpdating event whether to insert or update
        protected void insert_button_Click(Object sender, EventArgs e)
        {
            new Page().Session["InsertFlag"] = 1;
        }
        //just sets the insert flag OFF so that we ll be able to decide in OnRowUpdating event whether to insert or update 
        protected void edit_button_Click(Object sender, EventArgs e)
        {
            new Page().Session["InsertFlag"] = 0;
        }

        private void OnDataBinding(object sender, EventArgs e)
        {

            object bound_value_obj = null;
            Control ctrl = (Control)sender;
            IDataItemContainer data_item_container = (IDataItemContainer)ctrl.NamingContainer;
            bound_value_obj = DataBinder.Eval(data_item_container.DataItem, FieldName);

            switch (ItemType)
            {
                case ListItemType.Item:
                    Label field_ltrl = (Label)sender;
                    field_ltrl.Text = bound_value_obj.ToString();

                    break;
                case ListItemType.EditItem:
                    TextBox field_txtbox = (TextBox)sender;
                    field_txtbox.Text = bound_value_obj.ToString();

                    break;
            }


        }

        #endregion


    }
}