using Microsoft.SharePoint;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Taloyhtio.CondoUpdate.Common;

namespace CondoUpdate.ResponsiveLayout.PmcMasterPage
{
    public class UpdaterImpl : ICondoUpdater
    {
        private const string CONDO_PREFIX = "as oy ";
        private const string CONDO_WEB_TEMPLATE_NAME = "TaloyhtioCondoSite";
        private const int CONDO_SITE_WEB_TEMPLATE_ID = 10101;
        private const short CONDO_WEB_CONFIGURATION = 0;

        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.RootWeb)
                {
                    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)
            {
                if (!IsCondo(subWeb))
                {
                    this.fixWeb(subWeb);
                }
            }
        }

        private void fixWeb(SPWeb web)
        {
            bool oldAllowUnsafe = web.AllowUnsafeUpdates;
            web.AllowUnsafeUpdates = true;

            // first, explicitly set new masterpages
            web.CustomMasterUrl = web.CustomMasterUrl.Replace(Path.GetFileName(web.CustomMasterUrl), "taloyhtio_responsive_layout.master");
            web.MasterUrl = web.MasterUrl.Replace(Path.GetFileName(web.MasterUrl), "taloyhtio_responsive_layout_system.master");
            web.AllProperties["__InheritsMasterUrl"] = "False";
            web.AllProperties["__InheritsCustomMasterUrl"] = "False";
            web.Update();

            // then force web to inherit masterpages
            web.AllProperties["__InheritsMasterUrl"] = "True";
            web.AllProperties["__InheritsCustomMasterUrl"] = "True";
            web.Update();
            web.AllowUnsafeUpdates = oldAllowUnsafe;
        }

        public static bool IsCondo(SPWeb web)
        {
            try
            {
                if (web == null)
                {
                    return false;
                }
                return web.Title.ToLower().StartsWith(CONDO_PREFIX) ||
                    (string.Compare(web.WebTemplate, CONDO_WEB_TEMPLATE_NAME, true) == 0 && web.WebTemplateId == CONDO_SITE_WEB_TEMPLATE_ID) && web.Configuration == CONDO_WEB_CONFIGURATION;
            }
            catch (Exception)
            {
                return false;
            }
        }

        #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
    }
}