using System;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Web.UI.WebControls.WebParts;
using System.Xml;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Publishing;
using Taloyhtio.CondoUpdate.Common;
using WebPart = System.Web.UI.WebControls.WebParts.WebPart;

namespace CondoUpdate.ResponsiveLayout.CondoTalonIlmoitustauluWebPart
{
    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 condoWeb = site.OpenWeb())
                {
                    if (!condoWeb.Exists)
                    {
                        return;
                    }

                    if (!PublishingWeb.IsPublishingWeb(condoWeb))
                    {
                        return;
                    }
                    var pweb = PublishingWeb.GetPublishingWeb(condoWeb);
                    Thread.CurrentThread.CurrentUICulture = new CultureInfo((int)condoWeb.Language);
                    this.removeWebPart(pweb);
                    this.addWebPart(pweb);
                    
                }
            }
        }

        private void removeWebPart(PublishingWeb pWeb)
        {
            try 
            {
                var file = pWeb.DefaultPage;

                if (file.CheckOutType == SPFile.SPCheckOutType.None)
                {
                    file.CheckOut();
                }
                else
                {
                    // if file was checked out by another user, need undo check out and check in again in order to avoid errors
                    // when add web part
                    file.UndoCheckOut();
                    file.CheckOut();
                }
                using (var webPartManager = file.GetLimitedWebPartManager(PersonalizationScope.Shared))
                {
                    if (webPartManager == null)
                    {
                        this.error("Web part manager is null. Site won't be updated");
                        file.UndoCheckOut();
                        return;
                    }
                   
                    var webParts = webPartManager.WebParts;
                    if (webParts != null)
                    {
                        if (webParts.Cast<WebPart>().Any(wp => wp.Title == "Ilmoitustaulu"))
                        {
                            var webPart = webParts.Cast<WebPart>().First(wp => wp.Title == "Ilmoitustaulu");
                            webPartManager.DeleteWebPart(webPart);
                        }
                    }

                    file.Update();
                    file.CheckIn("Ilmoitustaulu is removed");
                    if (file.Item.ParentList.EnableMinorVersions)
                    {
                        file.Publish("Ilmoitustaulu is removed");
                    }
                    if (file.Item.ParentList.EnableModeration)
                    {
                        file.Approve("Ilmoitustaulu is removed");
                    }
                }
            }
            catch (Exception ex)
            {
                this.error("Error occured when remove web part from the '{0}' site:\n{1}\n{2}", pWeb.Url, ex.Message, ex.StackTrace);
                var file = pWeb.DefaultPage;
                if (file.CheckOutType != SPFile.SPCheckOutType.None)
                {
                    file.UndoCheckOut();
                }
            }
        }

        private void addWebPart(PublishingWeb pweb)
        {
            try
            {
                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
                {
                    // if file was checked out by another user, need undo check out and check in again in order to avoid errors
                    // when add web part
                    file.UndoCheckOut();
                    file.CheckOut();
                }
                using (var webPartManager = file.GetLimitedWebPartManager(PersonalizationScope.Shared))
                {
                    if (webPartManager == null)
                    {
                        this.error("Web part manager is null. Site won't be updated");
                        file.UndoCheckOut();
                        return;
                    }

                    bool alreadyExists = false;
                    var webParts = webPartManager.WebParts;
                    if (webParts != null)
                    {
                        if (webParts.Cast<WebPart>().Any(wp => wp.GetType().FullName == "Taloyhtio.CondoAutomation.BulletinBoardWebPart"))
                        {
                            this.warn("BulletinBoardWebPart already exist on start page. Site won't be updated");
                            alreadyExists = true;
                        }
                    }

                    if (alreadyExists)
                    {
                        file.UndoCheckOut();
                        return;
                    }


                    using (var fs = new MemoryStream(Encoding.UTF8.GetBytes(File.ReadAllText("BulletinBoardWebPart.webpart"))))
                    {
                        using (var reader = new XmlTextReader(fs))
                        {
                            string error;
                            WebPart wp = webPartManager.ImportWebPart(reader, out error);
                            if (wp == null)
                            {
                                this.error("Imported web part is null. Site '{0}' won't be updated. Error message: {1}", pweb.Web.Url, error);
                                file.UndoCheckOut();
                                return;
                            }
                            webPartManager.AddWebPart(wp, "LeftColumnZone", 1);
                            webPartManager.SaveChanges(wp);
                        }
                    }

                    file.Update();
                    file.CheckIn("BulletinBoardWebPart is added");
                    if (file.Item.ParentList.EnableMinorVersions)
                    {
                        file.Publish("BulletinBoardWebPart is added");
                    }
                    if (file.Item.ParentList.EnableModeration)
                    {
                        file.Approve("BulletinBoardWebPart is added");
                    }
                }
            }
            catch (Exception x)
            {
                this.error("Error occured when add web part to the '{0}' site:\n{1}\n{2}", pweb.Web.Url, x.Message, x.StackTrace);
                var file = pweb.DefaultPage;
                if (file.CheckOutType != SPFile.SPCheckOutType.None)
                {
                    file.UndoCheckOut();
                }
            }
        }

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

        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 });
            }
        }
    }
}