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

namespace CondoUpdate.TargetResponsibleUserFieldToGroup
{
    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))
            {
                var web = site.RootWeb;
                string listTitle = "Sivustot";
                var list = web.Lists.Cast<SPList>().FirstOrDefault(l => string.Compare(l.Title, listTitle, true) == 0);
                if (list == null)
                {
                    warn("List '{0}' not found", listTitle);
                    return;
                }

                string fieldTitle = "Isännöitsijä";
                var field = list.Fields.Cast<SPField>().FirstOrDefault(f => f.Title == fieldTitle) as SPFieldUser;
                if (field == null)
                {
                    warn("Field '{0}' not found", fieldTitle);
                    return;
                }

                string groupName = string.Format("{0} - Isännöitsijät", site.RootWeb.Title);
                var group = site.RootWeb.SiteGroups.Cast<SPGroup>().FirstOrDefault(g => string.Compare(g.Name, groupName, true) == 0);
                if (group == null)
                {
                    warn("Group '{0}' not found", groupName);
                    return;
                }

                field.SelectionMode = SPFieldUserSelectionMode.PeopleOnly;
                field.SelectionGroup = group.ID;
                field.Update();
            }
        }

        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 });
            }
        }
    }
}