using Microsoft.SharePoint;
using Microsoft.SharePoint.Publishing;
using Microsoft.SharePoint.Utilities;
using System;
using System.Globalization;
using System.Linq;
using System.Threading;
using Taloyhtio.CondoUpdate.Common;

namespace CondoUpdate.ResponsiveLayout.SetDefaultPageLayout
{
    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)
        {
            using (var site = new SPSite(url))
            {
                using (var web = site.OpenWeb())
                {
                    if (!web.Exists)
                    {
                        this.warn("Web site '{0}' doesn't exist. It will be ignored", url);
                        return;
                    }

                    Thread.CurrentThread.CurrentUICulture = new CultureInfo((int)web.Language);

                    this.fixWebs(web);
                }
            }
        }

        private void fixWebs(SPWeb web)
        {
            this.fixWeb(web);
            foreach (SPWeb subWeb in web.Webs)
            {
                this.fixWebs(subWeb);
            }
        }

        private void fixWeb(SPWeb web)
        {
            this.notify(LogLevel.Info, "start fixWeb for '{0}'", web.ServerRelativeUrl);
            var pages = SPUtility.GetLocalizedString("$Resources:List_Pages_UrlName", "cmscore", web.RegionalSettings.LocaleId);
            if (!web.GetFolder(pages).Exists)
            {
                this.error("site '{0}' has no pages ('{1}') library, site pages will not be updated", web.Url, pages);
                return;
            }

            bool oldAllowUnsafe = web.AllowUnsafeUpdates;
            web.AllowUnsafeUpdates = true;

            var pweb = PublishingWeb.GetPublishingWeb(web);
            var layout = pweb.GetAvailablePageLayouts().FirstOrDefault(l => string.Compare(l.Name, "taloyhtio_responsive_layout.aspx", true) == 0);
            var layoutWide = pweb.GetAvailablePageLayouts().FirstOrDefault(l => string.Compare(l.Name, "taloyhtio_responsive_layout_wide.aspx", true) == 0);
            this.notify(LogLevel.Info, "layout available: {0}", layout != null);
            this.notify(LogLevel.Info, "wide layout available: {0}", layoutWide != null);
            foreach (var page in pweb.GetPublishingPages())
            {
                this.notify(LogLevel.Info, "processing page '{0}'", page.Name); 
                var file = pweb.PagesList.RootFolder.Files.Cast<SPFile>().FirstOrDefault(f => string.Compare(f.Name, page.Name, true) == 0);
                if (file == null)
                {
                    this.error("cannot access file '{0}', page layout will not be updated", page.Name);
                    continue;
                }

                bool invalidLayout = false;
                try
                {
                    if (page.Layout == null)
                    {
                        this.warn("page '{0}' has no layout, set responsive one", page.Name);
                        //this.warn("page '{0}' has no layout, ignore", page.Name);
                        //continue;
                    }
                    else
                    {
                        string layoutName = page.Layout.Name;
                        this.notify(LogLevel.Info, "page '{0}' has layout '{1}'", page.Name, layoutName);
                    }
                }
                catch (Exception)
                {
                    this.notify(LogLevel.Warn, "page '{0}' has invalid page layout, skip it", page.Name);
                    invalidLayout = true;
                    continue;
                }

                if (invalidLayout || page.Layout == null || page.Layout.Name.ToLower().Equals("taloyhtiolayout.aspx"))
                {
                    if (file.CheckOutType == SPFile.SPCheckOutType.None)
                    {
                        file.CheckOut();
                    }
                    else
                    {
                        file.UndoCheckOut();
                        file.CheckOut();
                    }
                    page.Layout = layout;
                    page.Update();
                    file.CheckIn("set page layout");
                    if (file.Item.ParentList.EnableMinorVersions)
                    {
                        file.Publish("set page layout");
                    }
                    if (file.Item.ParentList.EnableModeration)
                    {
                        file.Approve("set page layout");
                    }
                }
                else if (page.Layout.Name.ToLower().Equals("taloyhtiolayoutwide.aspx"))
                {
                    if (file.CheckOutType == SPFile.SPCheckOutType.None)
                    {
                        file.CheckOut();
                    }
                    else
                    {
                        file.UndoCheckOut();
                        file.CheckOut();
                    }
                    page.Layout = layoutWide;
                    page.Update();
                    file.CheckIn("set page layout");
                    if (file.Item.ParentList.EnableMinorVersions)
                    {
                        file.Publish("set page layout");
                    }
                    if (file.Item.ParentList.EnableModeration)
                    {
                        file.Approve("set page layout");
                    }
                }
            }
            //pweb.SetDefaultPageLayout(layout, true);
            //pweb.Update();
            this.notify(LogLevel.Info, "end fixWeb for '{0}'", web.ServerRelativeUrl);
        }

        #region notifier
        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 });
            }
        }
        #endregion
    }
}