using System;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

namespace BronzeMonkey.GeneralTaskList
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class TaskListIndex : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.LinkButton lnkAdd;
		protected System.Web.UI.WebControls.LinkButton lnkRefresh;
		protected System.Web.UI.WebControls.DataGrid DataGrid1;
		protected System.Web.UI.WebControls.DropDownList cboTaskLists;
	
		//Our web service
		private TaskList tl = new TaskList();
		protected System.Web.UI.WebControls.LinkButton lnkLogOff;
		protected System.Web.UI.WebControls.LinkButton lnkMyPreferences;
		protected System.Web.UI.HtmlControls.HtmlGenericControl AdministrativeTasksHeader;
		protected System.Web.UI.HtmlControls.HtmlTable AdministrativeTasksTable;
		protected System.Web.UI.HtmlControls.HtmlImage imgManageTaskLists;
		protected System.Web.UI.HtmlControls.HtmlAnchor lnkManageTaskLists;
		protected System.Web.UI.HtmlControls.HtmlImage imgManageUsers;
		protected System.Web.UI.HtmlControls.HtmlAnchor lnkManageUsers;
		protected System.Web.UI.HtmlControls.HtmlImage imgManageApplication;
    protected System.Web.UI.HtmlControls.HtmlImage imgManageNotification;
    protected System.Web.UI.HtmlControls.HtmlAnchor lnkManageNotification;
		protected System.Web.UI.HtmlControls.HtmlAnchor lnkManageApplication;

		private UserInformation CurrentUser = new UserInformation();

		private void Page_Load(object sender, System.EventArgs e)
		{
			// Put user code to initialize the page here
			if (Session["CurrentUser"] == null) 
				Response.Redirect("login.aspx");
			else
				CurrentUser = (UserInformation)Session["CurrentUser"];

			if (!Page.IsPostBack)
			{
				CacheFontTagsForTaskSummary();
				LoadTaskListDropDown(cboTaskLists);
				DetermineMenusToShow();
				ShowTaskList(Convert.ToInt32(cboTaskLists.SelectedItem.Value));
			}
		}


		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.lnkAdd.Click += new System.EventHandler(this.lnkAdd_Click);
			this.lnkRefresh.Click += new System.EventHandler(this.lnkRefresh_Click);
			this.lnkMyPreferences.Click += new System.EventHandler(this.lnkMyPreferences_Click);
			this.lnkLogOff.Click += new System.EventHandler(this.lnkLogOff_Click);
			this.cboTaskLists.SelectedIndexChanged += new System.EventHandler(this.cboTaskLists_SelectedIndexChanged);
			this.DataGrid1.ItemCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_ItemCommand);
			this.DataGrid1.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid1_PageIndexChanged);
			this.DataGrid1.CancelCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_CancelCommand);
			this.DataGrid1.EditCommand += new System.Web.UI.WebControls.DataGridCommandEventHandler(this.DataGrid1_EditCommand);
			this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
			this.DataGrid1.SelectedIndexChanged += new System.EventHandler(this.DataGrid1_SelectedIndexChanged);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void DetermineMenusToShow()
		{
			lnkManageTaskLists.Visible = CurrentUser.IsManager; imgManageTaskLists.Visible = CurrentUser.IsManager;
			lnkManageUsers.Visible = CurrentUser.IsAdministrator; imgManageUsers.Visible = CurrentUser.IsAdministrator;
			lnkManageApplication.Visible = CurrentUser.IsAdministrator; imgManageApplication.Visible = CurrentUser.IsAdministrator;
      lnkManageNotification.Visible = CurrentUser.IsAdministrator; imgManageNotification.Visible = CurrentUser.IsAdministrator;

			AdministrativeTasksTable.Visible = false;
			AdministrativeTasksHeader.Visible = false;

			if (CurrentUser.IsManager || CurrentUser.IsAdministrator)
			{
				AdministrativeTasksTable.Visible = true;
				AdministrativeTasksHeader.Visible = true;
			}
		}

		private void LoadTaskListDropDown(DropDownList cboTaskLists)
		{
			SqlDataReader dr = tl.GetUserTaskLists(CurrentUser, CurrentUser.UserID);

			cboTaskLists.Items.Clear();

			while (dr.Read())
			{
				cboTaskLists.Items.Add(new ListItem(dr["TaskListName"].ToString(), dr["TaskListID"].ToString()));
			}
			
			cboTaskLists.SelectedIndex = -1;
			if (Session["TaskListID"] != null)
			{
				if (cboTaskLists.Items.FindByValue(Session["TaskListID"].ToString()) != null)	
					cboTaskLists.Items.FindByValue(Session["TaskListID"].ToString()).Selected = true;
			}
			else
			{
				//Get the startup task list
				int TaskListIDToShow;
				
				TaskListIDToShow = tl.GetStartupTaskListID(CurrentUser);

				if (cboTaskLists.Items.FindByValue(TaskListIDToShow.ToString()) != null)
					cboTaskLists.Items.FindByValue(TaskListIDToShow.ToString()).Selected = true;
			}
			if (cboTaskLists.SelectedItem.Value != String.Empty) Session["TaskListID"] = Convert.ToInt32(cboTaskLists.SelectedItem.Value);
		}

		/// <summary>
		/// Retrieve a list of the font tags that we flag our task summary headers with, and cache them
		/// in Session[].  We do this so that we can draw the fonts appropriately when building the grid, and
		/// we can do it dynamically by changing the text in the TaskListStatus table in the database.
		/// The usercontrol TaskSummary.ascx uses the Session value Session["StatusFontFlagsCollection"] to
		/// render the fonts on the grid.
		/// </summary>
		private void CacheFontTagsForTaskSummary()
		{
			NameValueCollection StatusFontFlags = new NameValueCollection();
		
			SqlDataReader dr = tl.GetStatusList(CurrentUser);
			while (dr.Read())
			{
				StatusFontFlags.Add(dr["Description"].ToString(), dr["FontFlags"].ToString());
			}
			Session["StatusFontFlagsCollection"] = StatusFontFlags;
		}

		/// <summary>
		/// Retrieves a list of the status codes in the database, and uses them to populate
		/// a drop-down list.  This gets executed when a user clicks the "View" button.
		/// </summary>
		/// <param name="StatusList">The DropDownList to populate with Status Codes.</param>
		private void LoadStatusList(DropDownList StatusList)
		{
			SqlDataReader dr = tl.GetStatusList(CurrentUser);
			while (dr.Read())
			{
				StatusList.Items.Add(new ListItem(dr["Description"].ToString(), dr["Value"].ToString()));
			}
		}

		private void LoadCategoryList(DropDownList CategoryList)
		{
			SqlDataReader dr = tl.GetCategoryList(CurrentUser);
			while( dr.Read() )
			{
				CategoryList.Items.Add(new ListItem(dr["Description"].ToString(), dr["CategoryID"].ToString()));
			}
		}

		/// <summary>
		/// Retrieves a task list and displays it on the DataGrid by using the DataGrid's
		/// DataBinding functionality.
		/// </summary>
		/// <param name="TaskListID">The Task List to retrieve</param>
		private void ShowTaskList(int TaskListID)
		{
			if (TaskListID == 0) return;

			int PreviousPageIndex = DataGrid1.CurrentPageIndex;
			DataGrid1.CurrentPageIndex = 0;
			DataSet ds = tl.GetTaskList(CurrentUser, TaskListID);
			DataView dv = ds.Tables[0].DefaultView;

			if (Session["TaskListSort"] != null) dv.Sort = Session["TaskListSort"].ToString();
			
			string NumberOfItemsToDisplay = tl.GetNumberOfItemsToDisplayPerPage(CurrentUser);
			
			if (NumberOfItemsToDisplay == "All" && dv.Count > 0)
				DataGrid1.PageSize = dv.Count;
			else if(NumberOfItemsToDisplay != "All" && dv.Count > 0)
				DataGrid1.PageSize = Convert.ToInt32(NumberOfItemsToDisplay);
			else
				DataGrid1.PageSize = 20; // default if there are no items to display.

			DataGrid1.DataSource = dv;
			DataGrid1.DataBind();
			DataGrid1.Columns[1].Visible = false;

			if (DataGrid1.PageCount == 1)
				DataGrid1.PagerStyle.Visible = false;
			else
				DataGrid1.PagerStyle.Visible = true;

			if (PreviousPageIndex > (DataGrid1.PageCount - 1))