using System;
using System.IO;
using System.Collections;
using System.Web.UI;
using System.Web.UI.WebControls;

using Newtonsoft.Json;

using FeedBuilder;

namespace Sample.Web.Controls
{
    public class RssReaderControl : CompositeControl, ICallbackEventHandler
    {
        private ITemplate itemTemplate;
        private String feedUrl;

        #region Support Types
        public class RssEntryData
        {
            private DateTime dateTime;
            private String title;
            private String link;

            public DateTime DateTime
            {
                get { return dateTime; }
                set { dateTime = value; }
            }

            public String Title
            {
                get { return title; }
                set { title = value; }
            }

            public String Link
            {
                get { return link; }
                set { link = value; }
            }

            public RssEntryData(DateTime dateTime, String title, String link)
            {
                this.DateTime = dateTime;
                this.Title = title;
                this.Link = link;
            }

            public RssEntryData()
            {
            }
        }

        public class TemplatedListItem : WebControl, IDataItemContainer
        {
            private RssEntryData data = new RssEntryData();
            private Int32 dataItemIndex;

            internal RssEntryData Data
            {
                get
                {
                    return data;
                }

                set
                {
                    data = value;
                }
            }

            #region IDataItemContainer Members

            public Object DataItem
            {
                get { return this.Data; }
            }

            public Int32 DataItemIndex
            {
                get
                {
                    return dataItemIndex;
                }

                set
                {
                    dataItemIndex = value;
                }
            }

            public Int32 DisplayIndex
            {
                get { return this.DataItemIndex; }
            }

            #endregion
        }

        [TemplateContainer(typeof(TemplatedListItem))]
        [PersistenceMode(PersistenceMode.InnerProperty)]
        public ITemplate ItemTemplate
        {
            get
            {
                return itemTemplate;
            }

            set
            {
                itemTemplate = value;
            }
        }

        public String FeedUrl
        {
            get
            {
                return feedUrl;
            }

            set
            {
                feedUrl = value;
            }
        }

        #endregion

        protected override void OnInit(EventArgs e)
        {
            Page.ClientScript.RegisterClientScriptResource(this.GetType(), "Sample.Resources.JavaScript.RssReaderControlCallback.js");
            base.OnInit(e);
        }

        protected override void RenderContents(HtmlTextWriter writer)
        {
            base.RenderContents(writer);
            if (!Page.IsCallback)
            {
                writer.RenderBeginTag(HtmlTextWriterTag.Span);
                writer.Write("Feed Address: ");
                writer.RenderEndTag();

                writer.AddAttribute(HtmlTextWriterAttribute.Id, this.ClientID + "_txtRssFeedAddress");
                writer.RenderBeginTag(HtmlTextWriterTag.Input);
                writer.RenderEndTag();

                writer.AddAttribute(HtmlTextWriterAttribute.Onclick, Page.ClientScript.GetCallbackEventReference(this, "document.getElementById('" + this.ClientID + "_txtRssFeedAddress').value", "Jampad.Sample.Web.RssReaderControl.getRssFeedCallback", "'" + this.ClientID + "_divResults'"));
                writer.AddAttribute(HtmlTextWriterAttribute.Type, "button");
                writer.AddAttribute(HtmlTextWriterAttribute.Value, "Get Feed");
                writer.RenderBeginTag(HtmlTextWriterTag.Input);
                writer.RenderEndTag();

                writer.AddAttribute(HtmlTextWriterAttribute.Id, this.ClientID + "_divResults");
                writer.RenderBeginTag(HtmlTextWriterTag.Div);
                writer.RenderEndTag();
            }
        }

        public String GetCallbackResult()
        {
            StringWriter sw = new StringWriter();
            HtmlTextWriter writer = new HtmlTextWriter(sw);
            this.RenderContents(writer);
            return sw.ToString();
        }

        public void RaiseCallbackEvent(String eventArgument)
        {
            AbstractReader reader = FeedReaderBuilder.Build(eventArgument);
            Int32 i = 0;
            if (this.ItemTemplate != null)
            {
                foreach (SimpleFeedEntry sfe in reader.GetEntryList())
                {
                    RssEntryData di = new RssEntryData(sfe.Date, sfe.Title, sfe.Link);
                    TemplatedListItem li = new TemplatedListItem();
                    li.Data = di;
                    li.DataItemIndex = ++i;
                    this.ItemTemplate.InstantiateIn(li);
                    Controls.Add(li);
                }
            }
            DataBind(false);
        }
    }
}