using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;

namespace Smartbeyond.WebControls
{
    /// <summary>
    /// Summary description for WebCustomControl1.
    /// </summary>
    [DefaultProperty("SelectedDate"),
        ToolboxData("<{0}:MonthYearPicker runat=server></{0}:MonthYearPicker>")]
    public class MonthYearPicker : System.Web.UI.WebControls.WebControl
    {

        [Bindable(true),
        Category("Appearance"),
        DefaultValue("")]
        public MonthYearPicker()
        {
            month = new DropDownList();
            year = new DropDownList();
            month.Items.Add(new ListItem("Select Month",""));
            month.Items.Add(new ListItem("January","1"));
            month.Items.Add(new ListItem("Febuary","2"));
            month.Items.Add(new ListItem("March","3"));
            month.Items.Add(new ListItem("April","4"));
            month.Items.Add(new ListItem("May","5"));
            month.Items.Add(new ListItem("June","6"));
            month.Items.Add(new ListItem("July","7"));
            month.Items.Add(new ListItem("August","8"));
            month.Items.Add(new ListItem("September","9"));
            month.Items.Add(new ListItem("October","10"));
            month.Items.Add(new ListItem("November","11"));
            month.Items.Add(new ListItem("December","12"));

            year.Items.Add(new ListItem("Select Year",""));
            for (int i = 1980; i <2010; i++)
            {
                year.Items.Add(new ListItem(Convert.ToString(i),Convert.ToString(i)));
            }

        }
        private DropDownList month;
        private DropDownList year;
        [Bindable(true),
        Category("SelectedDate"),
        Description("Gets or sets the date.")]
        public DateTime SelectedDate
        {
            get
            {
                DateTime selectedDate = new DateTime(00,01,01);
                if(year.SelectedValue != "" && month.SelectedValue != "") 
                {
                    selectedDate = new DateTime(Convert.ToInt32(year.SelectedValue), Convert.ToInt32(month.SelectedValue),01);
                }
                return selectedDate;
            }

            set
            {
                DateTime selectedDate = value;
                month.SelectedValue = Convert.ToString(selectedDate.Month);
                year.SelectedValue = Convert.ToString(selectedDate.Year);
            }
        }

        /// <summary>
        /// Render this control to the output parameter specified.
        /// </summary>
        /// <param name="output"> The HTML writer to write out to </param>
        protected override void Render(HtmlTextWriter output)
        {
            month.RenderControl(output);
            output.Write(" ");
            year.RenderControl(output);
        }

        protected override object SaveViewState()
        {

            object selectedDate = base.SaveViewState();
            if(year.SelectedValue != "" && month.SelectedValue != "") 
            {
                selectedDate = new DateTime(Convert.ToInt32(year.SelectedValue), Convert.ToInt32(month.SelectedValue),01);
            }
            return selectedDate;
        }
        protected override void LoadViewState(object savedState)
        {
            if (savedState == null) return;

            DateTime state = (DateTime) savedState;
            month.SelectedValue = Convert.ToString(state.Month);
            year.SelectedValue = Convert.ToString(state.Year);
        }
    }
}