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

namespace CondoUpdate.ResponsiveLayout.OsakkailleConfigureWebParts
{
    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);
            ChangeGlobalNavigation(url);
        }

        private void ChangeGlobalNavigation(string url)
        {
            try
            {
                using (var site = new SPSite(url))
                {
                    using (var web = site.OpenWeb())
                    {
                        if (web == null) return;

                        if (!web.Exists)
                        {
                            return;
                        }
                        bool allowUnsafeUpdates = web.AllowUnsafeUpdates;
                        web.AllowUnsafeUpdates = true;
                        Thread.CurrentThread.CurrentUICulture = new CultureInfo((int) web.Language);
                        var pweb = PublishingWeb.GetPublishingWeb(web);
                        var globalNavigation = pweb.Navigation.GlobalNavigationNodes;

                        var osakkailleNode =
                            globalNavigation.Cast<SPNavigationNode>()
                                .FirstOrDefault(p => p.Title.StartsWith("Osakkaille"));
                        var asukkailleNode =
                            globalNavigation.Cast<SPNavigationNode>()
                                .FirstOrDefault(p => p.Title.StartsWith("Asukkaille"));
                        if (osakkailleNode == null)
                        {
                            var node = SPNavigationSiteMapNode.CreateSPNavigationNode("Osakkaille",
                                SPUrlUtility.CombineUrl(web.Url, "Osakkaille"), NodeTypes.Heading, globalNavigation);
                            var dt = DateTime.Now;
                            node.Properties["CreatedDate"] = dt;
                            node.Properties["LastModifiedDate"] = dt;
                            node.Properties["Description"] = "";
                            node.Properties["Target"] = "";
                            node.Properties["Taloyhtio"] = "1";
                            node.Update();
                            if (asukkailleNode != null)
                                node.Move(globalNavigation, asukkailleNode);
                        }
                        else
                        {
                            this.warn("'{0}' navigation node already exists", "Osakkaille");
                            if (asukkailleNode != null)
                                osakkailleNode.Move(globalNavigation, asukkailleNode);
                        }

                        web.Update();
                        web.AllowUnsafeUpdates = allowUnsafeUpdates;
                    }
                }
            }
            catch (Exception x)
            {
                this.error("Error occured when update condo global navigation on {0} error: {1} {2}", url, x.Message,
                    x.StackTrace);
            }
        }

        private void configureWebParts(string url)
        {
            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;
                            SPWeb landlordWeb;
                            try
                            {
                                landlordWeb = web.Webs.FirstOrDefault(w => w.Title.StartsWith("Osakkaille"));
                            }
                            catch (Exception ex)
                            {
                                error("error occured when tring to get Osakkaille web error: {0} {1}", ex.Message,
                                    ex.StackTrace);
                                return;
                            }

                            if (landlordWeb == null)
                            {
                                this.warn("Site '{0}' doesn't exist. It will be ignored", url);
                                return;
                            }
                            if (!PublishingWeb.IsPublishingWeb(landlordWeb))
                            {
                                this.warn("Site '{0}' is not publishing web. It will be ignored", url);
                                return;
                            }

                            bool allowUnsafeUpdates = landlordWeb.AllowUnsafeUpdates;
                            try
                            {
                                landlordWeb.AllowUnsafeUpdates = true;
                                var pweb = PublishingWeb.GetPublishingWeb(landlordWeb);
                                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;
                                }

                                string handlerUrl = SPUrlUtility.CombineUrl(landlordWeb.Url,
                                    "_layouts/15/Taloyhtio/CondoAutomation/LandlordsWebPartUpdateHandler.ashx");
                                string urlWithQuery = string.Format("{0}?condo={1}", handlerUrl, landlordWeb.ServerRelativeUrl);
                                var request = (HttpWebRequest)WebRequest.Create(urlWithQuery);
                                request.Credentials = CredentialCache.DefaultNetworkCredentials;
                                var response = (HttpWebResponse) request.GetResponse();
                                if (response.StatusCode != HttpStatusCode.OK)
                                {
                                    this.error("Error occured during webparts update");
                                }
                                
                            }
                            catch (Exception ex)
                            {
                                this.error("Error occured during updating of Condo :\n{0}\n{1}", ex.Message,
                                    ex.StackTrace);
                            }
                            finally
                            {
                                landlordWeb.AllowUnsafeUpdates = allowUnsafeUpdates;
                                web.AllowUnsafeUpdates = condoAllowUnsafeUpdates;
                            }
                        }
                    }
                });
            }
            catch (Exception ex)
            {
                this.error("Error occured during updating of Condo :\n{0}\n{1}", ex.Message, ex.StackTrace);
            }
        }

        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 });
            }
        }
    }
}