using System;
using System.Linq;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using Taloyhtio.CondoUpdate.Common;

namespace CondoUpdate.AddResponsiblePropertyManagersGroup
{
    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())
                {
                    string groupName = getResponsiblePropertyManagersGroupName(web);
                    ensureSiteGroup(web, groupName);
                }
            }
        }

        private string getResponsiblePropertyManagersGroupName(SPWeb web)
        {
            return string.Format("{0} - Responsible accountants", web.Title);
        }

        private SPGroup ensureSiteGroup(SPWeb web, string groupName)
        {
            if (!isGroupExist(web, groupName))
            {
                web.SiteGroups.Add(groupName, web.SiteAdministrators[0], null, string.Empty);
            }

            return web.SiteGroups[groupName];
        }

        private static bool isGroupExist(SPWeb web, string groupName)
        {
            return web.SiteGroups.Cast<SPGroup>().Any(g => string.Compare(g.Name, groupName, true) == 0);
        }

        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 });
            }
        }
    }
}