using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading;
using System.Xml.Serialization;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using SPSolutions.Serialization;
using Taloyhtio.CondoUpdate.Common;

namespace CondoUpdate.RemoveAlerts
{
    public class SiteInfo
    {
        public string Url { get; set; }
        public string Prefix { get; set; }
    }

    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 web = site.OpenWeb())
                {
                    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.removeAlerts(web);
                    this.removeAlertsFromPMC(site, web);
                }
            }
        }

        private void removeAlerts(SPWeb web)
        {
            var alertIds = web.Alerts.Cast<SPAlert>().Select(a => a.ID).ToList();
            foreach (Guid alertId in alertIds)
            {
                web.Alerts.Delete(alertId);
            }

            foreach (SPWeb subWeb in web.Webs)
            {
                this.removeAlerts(subWeb);
            }
        }

        private void removeAlertsFromPMC(SPSite site, SPWeb condo)
        {
            var rootWeb = site.RootWeb;
            var alertIds = new List<Guid>();
            var alerts = rootWeb.Alerts.Cast<SPAlert>().ToList();
            foreach (var alert in alerts)
            {
                var alertGroups = getAlertTargetGroups(alert);
                if (alertGroups.Count == 0)
                {
                    continue;
                }

                if (alertGroups.Any(g => g.ToLower().StartsWith(condo.Title.ToLower())))
                {
                    alertIds.Add(alert.ID);
                }
            }

            foreach (Guid alertId in alertIds)
            {
                rootWeb.Alerts.Delete(alertId);
            }
        }

        private List<string> getAlertTargetGroups(SPAlert alert)
        {
            try
            {
                if (alert == null)
                {
                    return new List<string>();
                }
                var list = new List<string>();
                if (alert.Properties.ContainsKey("AlertGroups") && (alert.Properties["AlertGroups"] != null))
                {
                    string str = alert.Properties["AlertGroups"];
                    if (!string.IsNullOrEmpty(str))
                    {
                        var groupNames = SerializationUtil.Deserialize<string[]>(str);
                        if ((groupNames != null) && (groupNames.Length > 0))
                        {
                            list.AddRange(groupNames);
                        }
                    }
                }
                return list;
            }
            catch (Exception x)
            {
                return new List<string>();
            }
        }

        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 });
            }
        }
    }
}