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.AddSiteCollectionAdmin
{
    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)
        {
            SPSecurity.RunWithElevatedPrivileges(
                () =>
                    {                        
                        using (var siteDefault = new SPSite(url))
                        {
                            using (var site = new SPSite(siteDefault.ID, SPUrlZone.Extranet))
                            {
                                using (var web = site.OpenWeb())
                                {
                                    //this.info("Web url is '{0}'", web.Url);

                                    web.AllowUnsafeUpdates = true;
                                    HttpRequest request = new HttpRequest("", web.Url, "");
                                    HttpContext.Current = new HttpContext(request, new HttpResponse(new StringWriter()));
                                    HttpContext.Current.Items["HttpHandlerSPWeb"] = web;

                                    string key = "userToSiteCollectionAdmin";
                                    string userName = ConfigurationManager.AppSettings[key];
                                    if (string.IsNullOrEmpty(userName))
                                    {
                                        this.error("User name is not specified in '{0}' app setting", key);
                                        return;
                                    }

                                    var user = web.EnsureUser(userName);
                                    if (user == null)
                                    {
                                        this.error("User not found for site '{0}'", site.Url);
                                        return;
                                    }
                                    if (user.IsSiteAdmin)
                                    {
                                        this.info("");
                                        return;
                                    }
                                    user.IsSiteAdmin = true;
                                    user.Update();

                                    HttpContext.Current.Items["HttpHandlerSPWeb"] = null;
                                    HttpContext.Current = null;
                                }
                            }
                        }
                    });
        }

        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 });
            }
        }
    }
}