using System;
using System.ComponentModel;
using System.Web.UI;
using BulletinX.Components;

namespace BulletinX.Controls
{
    public class Style : LiteralControl
    {
        [ DefaultValue( "screen" ) ]
        public virtual string Media
        {
            get
            {
                object state = ViewState[ "Media" ];
                if ( state != null )
                {
                    return (string)state;
                }
                return "screen";
            }
            set { ViewState[ "Media" ] = value; }
        }
        private string appliation = string.Empty;
        public string Application
        {
            get { return appliation; }
            set { appliation = value; }
        }
        public virtual String Href
        {
            get
            {
                string state = (string)ViewState[ "Href" ];
                if ( state != null )
                {
                    if ( state.StartsWith( "/" ) || state.StartsWith( "." ) || state.StartsWith( "~" ) || state.StartsWith( "http://" ) )
                    {
                        return ResolveUrl( state );
                    }
                    else
                    {
                        return ResolveUrl( "http://" + state );
                    }
                }
                else
                {
                    return "";
                }
            }
            set { ViewState[ "Href" ] = value; }
        }
        public virtual StyleFlags RelativePosition
        {
            get
            {
                Object state = ViewState[ "RelativePosition" ];
                if ( state != null )
                {
                    return (StyleFlags)Enum.Parse( typeof( StyleFlags ), state.ToString( ) );
                }
                else
                {
                    return StyleFlags.Unknown;
                }
            }
            set { ViewState[ "RelativePosition" ] = value; }
        }
        public virtual bool Enqueue
        {
            get
            {
                Object state = ViewState[ "Enqueue" ];
                if ( state != null )
                {
                    return bool.Parse( state.ToString( ) );
                }
                else
                {
                    return false;
                }
            }
            set { ViewState[ "Enqueue" ] = value; }
        }
        private const string linkFormat = "<link rel=\"stylesheet\" href=\"{0}\" type=\"text/css\" media=\"{1}\" />";
        protected override void OnPreRender( EventArgs e )
        {
            if ( Enqueue )
            {
                Head.AddStyle( Href, Media, RelativePosition );
            }
        }
        
        protected override void Render(HtmlTextWriter writer)
        {
            if(Enqueue)
                return;
            if (Href != null)
                writer.Write( linkFormat, Href, Media );
        }
    }
}