using System;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Net;
using System.Web;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Administration;
using Microsoft.SharePoint.Utilities;
using Taloyhtio.CondoUpdate.Common;

namespace CondoUpdate.AddonsTargeting
{
    public class UpdaterImpl : ICondoUpdater
    {
        public const string LIST_TITLE = "Lisäpalvelut";
        public const string FIELD_TARGET_GROUPS = "Kohderyhmät";
        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))
            {
                bool updateRootWeb = false;
                if (!string.IsNullOrEmpty(ConfigurationManager.AppSettings["updateRootWeb"]))
                {
                    updateRootWeb = bool.Parse(ConfigurationManager.AppSettings["updateRootWeb"]);
                }

                if (updateRootWeb)
                {
                    this.fixAddonsList(site.RootWeb);
                }
                else
                {
                    using (var web = site.OpenWeb())
                    {
                        this.fixAddonsList(web);
                    }
                }
            }
        }

        private void fixAddonsList(SPWeb web)
        {
            var list = web.Lists.Cast<SPList>().FirstOrDefault(l => l.Title == LIST_TITLE);
            if (list == null)
            {
                // list is not created yet => condo was not updated yet
                return;
            }

            var field = list.Fields.Cast<SPField>().FirstOrDefault(f => f.Title == FIELD_TARGET_GROUPS);
            if (field != null)
            {
                // field already exists
                return;
            }

            string groupsFieldId = list.Fields.Add(FIELD_TARGET_GROUPS, SPFieldType.User, false);
            list.Update();

            var groupsField = list.Fields.Cast<SPField>().FirstOrDefault(i => i.InternalName == groupsFieldId || i.StaticName == groupsFieldId) as SPFieldUser;
            if (groupsField == null)
            {
                throw new Exception(string.Format("Field '{0}' not found in the list '{1}'", FIELD_TARGET_GROUPS, LIST_TITLE));
            }

            groupsField.SelectionMode = SPFieldUserSelectionMode.PeopleAndGroups;
            groupsField.AllowMultipleValues = true;
            groupsField.Update();
            list.Update();

            var view = list.DefaultView;
            Action<string> addFieldToView = fieldTitle =>
            {
                if (string.IsNullOrEmpty(fieldTitle))
                {
                    return;
                }
                var f = list.Fields.Cast<SPField>().FirstOrDefault(i => i.Title == fieldTitle || i.StaticName == fieldTitle);
                if (f == null)
                {
                    return;
                }
                view.ViewFields.Add(f);
            };
            addFieldToView(FIELD_TARGET_GROUPS);
            view.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 });
            }
        }
    }
}