using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Xml.Serialization;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using SPSolutions.SharePoint.Alerts;
using Taloyhtio.CondoUpdate.Common;
using Taloyhtio.CustomAlertHandler.CodeFiles;

namespace CondoUpdate.UpdateCondoAlerts
{
    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)
        {
            ensureMappingsListExists(url);
            // condo
            fixList(url, "/Lists/Ilmoitustaulu");
            fixList(url + "/asukkaille", "/Documents");
            fixList(url + "/osakkaille", "/Documents");
            fixList(url + "/Osakkaille", "/Lists/Osakastiedotteet");
            fixList(url + "/hallitukselle", "/Documents");
            fixList(url + "/Hallitukselle", "/Lists/Hallituksen%20tiedotteet");
            fixList(url + "/Hallitukselle", "/Lists/Kalenteri");
            fixList(url + "/Hallitukselle", "/Lists/Keskustelupalsta");
            // company
//            fixList(url, "/Lists/Ilmoitustaulu");
//            fixList(url, "/Documents");
//            fixList(url, "/Lists/Asiakirjojen%20lhetys%20tilitoimistolle");
//            fixList(url, "/Lists/Keskustelu");
//            fixList(url, "/Tuntilistat%20ja%20verokortit", false); // was added manually on company sites under /rp AC
        }

        private void ensureMappingsListExists(string webUrl)
        {
            using (var site = new SPSite(webUrl))
            {
                var web = site.RootWeb;
                var mappingList = web.Lists.Cast<SPList>().FirstOrDefault(l => l.Title == Constants.CUSTOM_ALERT_HANDLER_MAPPINGS_LIST);
                if (mappingList != null)
                {
                    return;
                }

                web.Features.Add(new Guid("8cc68f6e-e53a-4f16-baba-307b82d607fb"), true);
            }
        }

        private void fixList(string webUrl, string listUrl, bool reportErrorIfListNotExists = true)
        {
            //log("Check list '{0}' in web '{1}'", listUrl, webUrl);
            using (var site = new SPSite(webUrl))
            {
                using (var web = site.OpenWeb())
                {
                    SPList list = null;
                    try
                    {
                        string url = SPUrlUtility.CombineUrl(webUrl, listUrl);
                        list = web.GetList(url);
                    }
                    catch
                    {
                    }

                    if (list == null)
                    {
                        if (reportErrorIfListNotExists)
                        {
                            error("List '{0}' can't be found", listUrl);
                        }
                        return;
                    }

                    string msg;
//                    bool? alreadyActivated = AlertTemplateConfigurator.HasEnabledFromField(list, out msg);
//                    if (alreadyActivated != null && alreadyActivated.Value)
//                    {
//                        //log("Custom alert handler is already activated");
//                        return;
//                    }

                    // get first alert from list (normally in all lists affected by alert creation tool there is only 1 alert)
                    var alert = getFirstListAlert(web, list);
                    if (alert == null)
                    {
                        //log("There are no alerts in the list");
                        return;
                    }

                    // get alert template from this list
                    var alertTemplate = alert.AlertTemplate;
                    if (alertTemplate == null)
                    {
                        error("Alert's alert template is null (list '{0}')", listUrl);
                        return;
                    }

                    if (!isCustom(alertTemplate))
                    {
                        error("Alert template '{0}' is not custom (list '{1}')", alertTemplate.DisplayName, listUrl);
                        return;
                    }

                    // assign alert template
                    list.AlertTemplate = alertTemplate;
                    list.Update();
                    //log("List's alert template was set to '{0}'", alertTemplate.DisplayName);

                    if (!AlertTemplateConfigurator.ActivateCustomAlertHandlerOnList(list, true, out msg))
                    {
                        error("There was problem when activating custom alert handler: '{0}' (list '{1}')", msg, listUrl);
                        return;
                    }

                    //log("Custom alert handler was successfilly activated");
                }
            }
        }

        private static SPAlert getFirstListAlert(SPWeb web, SPList list)
        {
            var alerts = web.Alerts.Cast<SPAlert>();
            return alerts.FirstOrDefault(a => a.ListID == list.ID);
        }

        // This is copy of Alert template's AlertTemplateManager.IsCustom property implementation
        private static bool isCustom(SPAlertTemplate t)
        {
            return (((t.Properties["Custom"] != null) && (t.Properties["Custom"] is string)) && (((string)t.Properties["Custom"]) == SPAlertTemplateUtil.CustomAlertTemplateIdentifier));
        }

        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 });
            }
        }
    }
}