using System;
using Codebot.Web;
using System.IO;
using System.Text.RegularExpressions;
using System.Text;
using System.Web.SessionState;

namespace Codebot.Lazarus.Web
{
    [DefaultPage("/templates/main.html", IsTemplate = true)]
    public class HomePage : Codebot.Web.PageHandler
    {
        #region Some utility functions to keep things clean
        protected string EditedTitleName
        {
            get
            {
                return MapPath("title." + Request.UserHostAddress + ".txt");
            }
        }

        protected string EditedContentName
        {
            get
            {
                return MapPath("home." + Request.UserHostAddress + ".txt");
            }
        }

        protected bool IsAdmin
        {
            get
            {
                var address = Request.UserHostAddress;
                return address.Equals("127.0.0.1") || address.StartsWith("192.168.1.");
            }
        }

        protected static bool SameText(string a, string b)
        {
            a = Regex.Replace(a, "\\b+", " ");
            b = Regex.Replace(b, "\\b+", " ");
            return a.Equals(b);
        }
        #endregion

        #region Action methods invoked by ajax calls on the client
        [MethodPage("title")]
        public void ActionTitle()
        {
            if (IsPost)
            {
                string edit = HtmlEscape(ReadStream().Trim());
                if (String.IsNullOrEmpty(edit))
                    return;
                string title = Title;
                if (!SameText(edit, title))
                {
                    string filename = EditedTitleName;
                    File.WriteAllText(filename, edit);
                }
            }
            else
                Write(EditedTitle);
        }

        [MethodPage("edit")]
        public void ActionEdit()
        {
            if (IsPost)
            {
                string edit = ReadStream().Trim();
                if (String.IsNullOrEmpty(edit))
                    return;
                string original = IncludeRead("home.html");
                if (!SameText(edit, original))
                    File.WriteAllText(EditedContentName, edit);
            }
            else
                Include("/templates/edit.html", true);
        }

        [MethodPage("original")]
        public void ActionOriginal()
        {
            Include("home.html");
        }

        [MethodPage("preview")]
        public void ActionPreview()
        {
            Write(Content);
        }

        [MethodPage("delete")]
        public void ActionDelete()
        {
            if (IsPost)
            {
                if (File.Exists(EditedTitleName))
                    File.Delete(EditedTitleName);
                if (File.Exists(EditedContentName))
                    File.Delete(EditedContentName);
            }
        }

        [MethodPage("apply")]
        public void ActionApply()
        {
            if (IsPost && IsAdmin)
            {
                string dest = MapPath("title.txt");
                string folder = Path.GetDirectoryName(dest);
                string stamp = DateTime.UtcNow.ToString("yyyyMMddHHmmss");
                if (File.Exists(EditedTitleName))
                {
                    if (File.Exists(dest))
                        File.Move(dest, Path.Combine(folder, "title." + stamp + ".txt"));
                    File.Move(EditedTitleName, dest);
                }
                dest = MapPath("home.html");
                if (File.Exists(EditedContentName))
                {
                    if (File.Exists(dest))
                        File.Move(dest, Path.Combine(folder, "home." + stamp + ".txt"));
                    File.Move(EditedContentName, dest);
                }
            }
        }
        #endregion

        #region Template properties
        public string BreadCrumb
        {
            get
            {
                string s = String.Empty;
                string current = MapPath("title.txt");
                string last = MapPath("/title.txt");
                while (true)
                {
                    string title = File.Exists(current) ? File.ReadAllText(current) : Settings.Read("defaults/title", "Title");
                    string path = Path.GetDirectoryName(current);
                    string id = String.Empty;
                    if (s.Length == 0)
                        id = "id =\"path\" ";
                    s = String.Format("<a {0}href=\"{1}\">{2}</a>", id, ReverseMapPath(path), title) + s;
                    if (current.Equals(last))
                        return s;
                    current = Path.GetDirectoryName(path);
                    current = Path.Combine(current, "title.txt");
                }
            }
        }

        public string EditedTitle
        {
            get
            {
                return File.Exists(EditedTitleName) ? HtmlEscape(File.ReadAllText(EditedTitleName)) : Title;
            }
        }

        public string Title
        {
            get
            {
                return File.Exists(MapPath("title.txt")) ? HtmlEscape(IncludeRead("title.txt")) : Settings.Read("defaults/title", "Title");
            }
        }

        public string Content
        {
            get
            {
                if (File.Exists(EditedContentName))
                    return File.ReadAllText(EditedContentName);
                else
                    return IncludeRead("home.html");
            }
        }

        public string EditorTools
        {
            get
            {
                string tools = IsAdmin ? "/templates/editor-tools-admin.html" : "/templates/editor-tools.html";
                return IncludeRead(tools);
            }
        }

        public string EscapedContent
        {
            get
            {
                return Content
                    .Replace("&lt;", "&amp;lt;")
                    .Replace("&gt;", "&amp;gt;")
                    .Replace("<", "&lt;")
                    .Replace(">", "&gt;");
            }
        }
        #endregion
    }
}