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

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

                string fieldTitle = "Isännöitsijä FBA";
                if (!list.Fields.Cast<SPField>().Any(f => f.Title == fieldTitle))
                {
                    string internalName = list.Fields.Add(fieldTitle, SPFieldType.User, false);
                    addFieldIntoDefaultView(list, internalName);
                }
            }
        }

        private void addFieldIntoDefaultView(SPList list, string internalName)
        {
            var field = list.Fields.Cast<SPField>().FirstOrDefault(i => i.InternalName == internalName || i.StaticName == internalName);
            if (field == null)
            {
                return;
            }

            try
            {
                var view = list.DefaultView;
                var viewFields = view.ViewFields;
                viewFields.Add(field);
                view.Update();
            }
            catch (Exception x)
            {
                error("Exception occured: {0}\n{1}", x.Message);
            }
        }

        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 });
            }
        }
    }
}