using Microsoft.SharePoint;
using Microsoft.SharePoint.Publishing;
using Microsoft.SharePoint.WebPartPages;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Taloyhtio.CondoUpdate.Common;
using System.Web.UI.WebControls.WebParts;
using WebPart = System.Web.UI.WebControls.WebParts.WebPart;

namespace CondoUpdate.DoclibSort
{
    public class UpdaterImpl : ICondoUpdater
    {
        private const string WEBPART_TITLE = "Tiedostot";
        private const string WEBPART_TITLE_ALT = "Asiakirjat";
        private const string WEBPART_TITLE_ENG = "Documents";
        private const string SORT_BY_MODIFIED = "<FieldRef Name=\"Modified\" Ascending=\"FALSE\"/>";
        private const string SORT_BY_FILENAME = "<FieldRef Name=\"FileLeafRef\" Ascending=\"TRUE\"/>";
        private string[] webTitles = { "Asukkaille", "Osakkaille", "Hallitukselle" };

        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)
        {
            try
            {
                SPSecurity.RunWithElevatedPrivileges(() =>
                {
                    using (var site = new SPSite(url))
                    {
                        using (var web = site.OpenWeb())
                        {
                            if (web == null)
                            {
                                return;
                            }

                            foreach (var subsite in webTitles)
                            {
                                try
                                {
                                    var subWeb = web.Webs.FirstOrDefault(w => w.Title.StartsWith(subsite));
                                    if (subWeb == null)
                                    {
                                        this.warn("subite '{0}' doesn't exist. It will be ignored", subsite);
                                        continue;
                                    }
                                    if (!PublishingWeb.IsPublishingWeb(subWeb))
                                    {
                                        this.warn("site '{0}' is not publishing web. It will be ignored", subWeb.Url);
                                        continue;
                                    }
                                    var pweb = PublishingWeb.GetPublishingWeb(subWeb);
                                    var file = pweb.DefaultPage;
                                    if (file == null)
                                    {
                                        this.error("Start page is null. Site won't be updated");
                                        continue;
                                    }
                                    if (file.CheckOutType != SPFile.SPCheckOutType.None)
                                    {
                                        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();
                                            continue;
                                        }
                                        bool changed = false;
                                        var webParts = webPartManager.WebParts;
                                        if (webParts != null)
                                        {
                                            foreach (WebPart wp in webParts)
                                            {
                                                if (wp.Title.Equals(WEBPART_TITLE) || wp.Title.Equals(WEBPART_TITLE_ALT) || wp.Title.Equals(WEBPART_TITLE_ENG))
                                                {
                                                    var view = ((XsltListViewWebPart)wp).View;
                                                    string xml = view.GetViewXml();
                                                    if (xml.Contains(SORT_BY_MODIFIED))
                                                    {
                                                        xml = xml.Replace(SORT_BY_MODIFIED, SORT_BY_FILENAME);
                                                        view.SetViewXml(xml);
                                                        view.Update();
                                                        webPartManager.SaveChanges(wp);
                                                        changed = true;
                                                    }
                                                    else
                                                    {
                                                        this.warn("sort by modified date not found. ignore");
                                                    }
                                                    break;
                                                }
                                            }
                                        }
                                        if (!changed)
                                        {
                                            file.UndoCheckOut();
                                            return;
                                        }
                                        file.Update();
                                        file.CheckIn("set sort order for documents webpart");
                                        if (file.Item.ParentList.EnableMinorVersions)
                                        {
                                            file.Publish("set sort order for documents webpart");
                                        }
                                        if (file.Item.ParentList.EnableModeration)
                                        {
                                            file.Approve("set sort order for documents webpart");
                                        }
                                    }
                                }
                                catch (Exception ex)
                                {
                                    error("error occured when trying to get Hallitukselle web error: {0} {1}", ex.Message, ex.StackTrace);
                                    return;
                                }

                            }

                        }
                    }
                });
            }
            catch (Exception ex)
            {
                this.error("Error occured during updating of Condo :\n{0}\n{1}", ex.Message, ex.StackTrace);
            }
        }

        #region notify
        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
    }
}