using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using ScrewTurn.Wiki.PluginFramework;

namespace ScrewTurn.Wiki {

	public partial class PageListBuilder : System.Web.UI.UserControl {

		protected void Page_Load(object sender, EventArgs e) {
			if(!Page.IsPostBack) {
				CurrentProvider = Settings.DefaultPagesProvider;
			}
		}

		/// <summary>
		/// Gets or sets the current namespace.
		/// </summary>
		public string CurrentNamespace {
			get { return ViewState["CN"] as string; }
			set { ViewState["CN"] = value; }
		}

		/// <summary>
		/// Gets or sets the current provider.
		/// </summary>
		public string CurrentProvider {
			get { return ViewState["CP"] as string; }
			set {
				ViewState["CP"] = value;
				ResetControl();
			}
		}

		/// <summary>
		/// Gets or the selected pages.
		/// </summary>
		public IList<string> SelectedPages {
			get {
				List<string> result = new List<string>(lstPages.Items.Count);
				
				foreach(ListItem item in lstPages.Items) {
					result.Add(item.Value);
				}

				return result;
			}
		}

		/// <summary>
		/// Resets the editor.
		/// </summary>
		public void ResetControl() {
			txtPageName.Text = "";
			lstAvailablePage.Items.Clear();
			btnAddPage.Enabled = false;
			lstPages.Items.Clear();
			btnRemove.Enabled = false;
		}

		protected void btnSearch_Click(object sender, EventArgs e) {
			lstAvailablePage.Items.Clear();
			btnAddPage.Enabled = false;

			txtPageName.Text = txtPageName.Text.Trim();

			if(txtPageName.Text.Length == 0) return;

			PageInfo[] pages = SearchTools.SearchSimilarPages(txtPageName.Text, CurrentNamespace);

			string cp = CurrentProvider;

			foreach(PageInfo page in
				from p in pages
				where p.Provider.GetType().FullName == cp
				select p) {

				// Filter pages already in the list
				bool found = false;
				foreach(ListItem item in lstPages.Items) {
					if(item.Value == page.FullName) {
						found = true;
						break;
					}
				}

				if(!found) {
					PageContent content = Content.GetPageContent(page, false);
					lstAvailablePage.Items.Add(new ListItem(FormattingPipeline.PrepareTitle(content.Title, false, FormattingContext.Other, page), page.FullName));
				}
			}

			btnAddPage.Enabled = lstAvailablePage.Items.Count > 0;
		}

		protected void btnAddPage_Click(object sender, EventArgs e) {
			PageInfo page = Pages.FindPage(lstAvailablePage.SelectedValue);
			PageContent content = Content.GetPageContent(page, false);

			lstPages.Items.Add(new ListItem(FormattingPipeline.PrepareTitle(content.Title, false, FormattingContext.Other, page), page.FullName));

			lstAvailablePage.Items.RemoveAt(lstAvailablePage.SelectedIndex);
			btnAddPage.Enabled = lstAvailablePage.Items.Count > 0;
		}

		protected void lstPages_SelectedIndexChanged(object sender, EventArgs e) {
			btnRemove.Enabled = lstPages.SelectedIndex != -1;
		}

		protected void btnRemove_Click(object sender, EventArgs e) {
			lstPages.Items.RemoveAt(lstPages.SelectedIndex);
			lstPages.SelectedIndex = -1;
			btnRemove.Enabled = false;
		}

	}

}