using System;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Threading;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Publishing;
using Microsoft.SharePoint.Utilities;
using Microsoft.SharePoint.WebPartPages;
using Taloyhtio.CondoUpdate.Common;
using Taloyhtio.WhatsNewWebpart;
using WebPart = System.Web.UI.WebControls.WebParts.WebPart;

namespace CondoUpdate.ResponsiveLayout.CondoSiteConfigureWebParts
{
    public class UpdaterImpl:ICondoUpdater
    {
        public event EventHandler<LogEventArgs> OnNotify;
        public void Update(object args)
        {
            string url = args as string;

            if (string.IsNullOrEmpty(url))
            {
                this.warn("Url is empty");
                return;
            }
            
            try
            {
                this.updateImpl(url);
            }
            catch (Exception x)
            {
                this.error("Error occured during updating of Condo '{0}':\n{1}\n{2}", url, x.Message, x.StackTrace);
            }
        }

        private void updateImpl(string url)
        {
            configureWebParts(url);
        }

        private void configureWebParts(string url)
        {
            PublishingWeb pweb = null;
            try
            {
                SPSecurity.RunWithElevatedPrivileges(() =>
                {
                    using (var site = new SPSite(url))
                    {
                        using (var web = site.OpenWeb())
                        {
                            if (web == null)
                            {
                                return;
                            }
                            Thread.CurrentThread.CurrentUICulture = new CultureInfo((int) web.Language);
                            bool condoAllowUnsafeUpdates = web.AllowUnsafeUpdates;
                            web.AllowUnsafeUpdates = true;

                            pweb = PublishingWeb.GetPublishingWeb(web);
                            if (pweb == null || pweb.DefaultPage == null ||
                                string.IsNullOrEmpty(pweb.DefaultPage.ServerRelativeUrl))
                            {
                                this.warn("Publishing web of '{0}' is null. It will be ignored", url);
                                return;
                            }

                            var file = pweb.DefaultPage;
                            if (file == null)
                            {
                                this.error("Start page is null. Site won't be updated");
                                return;
                            }

                            if (file.CheckOutType == SPFile.SPCheckOutType.None)
                            {
                                file.CheckOut();
                            }
                            else
                            {
                                file.UndoCheckOut();
                                file.CheckOut();
                            }

                            using (var manager = file.GetLimitedWebPartManager(PersonalizationScope.Shared))
                            {
                                if (manager == null)
                                {
                                    file.UndoCheckOut();
                                    this.error("Web part manager is null. Site won't be updated");
                                    return;
                                }

                                if (manager.WebParts != null)
                                {
                                    if (!manager.WebParts.Cast<WebPart>()
                                            .Any(wp => wp.Title.ToLower().Equals("uusimmat päivitykset")) &&
                                        !manager.WebParts.Cast<WebPart>()
                                            .Any(wp => wp.Title.ToLower().Equals("ilmoitustaulu")) &&
                                        !manager.WebParts.Cast<WebPart>()
                                            .Any(wp => wp.Title.ToLower().Equals("isännöitsijä tiedottaa – asukastiedotteet"))
                                        )
                                    {
                                        file.UndoCheckOut();
                                        this.error("Web parts are already configured. Site won't be updated");
                                        return;
                                    }
                                    foreach (WebPart wp in manager.WebParts)
                                    {
                                        if (wp.Title.ToLower().Equals("uusimmat päivitykset"))
                                        {
                                            wp.Title = "Uutta palvelussa";
                                            var whatsNew = wp as WhatsNewWebpart;
                                            if (whatsNew != null)
                                            {
                                                whatsNew.MaxItems = 15;
                                                whatsNew.ShowTime = false;
                                            }
                                            manager.SaveChanges(wp);
                                        }

                                        if (wp.Title.ToLower().Equals("ilmoitustaulu"))
                                        {
                                            wp.Title = "Talon Ilmoitustaulu";
                                            manager.SaveChanges(wp);
                                        }

                                        if (wp.Title.ToLower().Equals("isännöitsijä tiedottaa – asukastiedotteet"))
                                        {
                                            wp.Title = "Isännöitsijä tiedottaa";
                                            manager.SaveChanges(wp);
                                        }

                                    }
                                }
                                file.Update();
                                file.CheckIn("Updated Condo site webparts");
                                if (file.Item.ParentList.EnableMinorVersions)
                                {
                                    file.Publish("Updated Condo site webparts");
                                }
                                if (file.Item.ParentList.EnableModeration)
                                {
                                    file.Approve("Updated Condo site webparts");
                                }
                            }
                            web.AllowUnsafeUpdates = condoAllowUnsafeUpdates;
                        }
                    }
                });
            }
            catch (Exception ex)
            {
                if (pweb != null)
                {
                    this.error("Error occured when update web part on '{0}' site:\n{1}\n{2}", pweb.Web.Url, ex.Message,
                        ex.StackTrace);

                    var file = pweb.DefaultPage;
                    if (file.CheckOutType != SPFile.SPCheckOutType.None)
                    {
                        file.UndoCheckOut();
                    }
                }
            }
        }
        
        private void warn(string msg, params object[] args)
        {
            this.notify(LogLevel.Warn, msg, args);
        }

        private void error(string msg, params object[] args)
        {
            this.notify(LogLevel.Error, msg, args);
        }

        private void notify(LogLevel level, string msg, params object[] args)
        {
            this.notify(level, string.Format(msg, args));
        }

        private void notify(LogLevel level, string msg)
        {
            if (this.OnNotify != null)
            {
                this.OnNotify(this, new LogEventArgs { LogLevel = level, Message = msg });
            }
        }
    }
}