using System;
using System.Linq;
using System.Text.RegularExpressions;
using System.Web.UI.WebControls.WebParts;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Publishing;
using Microsoft.SharePoint.WebPartPages;
using Taloyhtio.CondoUpdate.Common;
using WebPart = System.Web.UI.WebControls.WebParts.WebPart;

namespace CondoUpdate.ChangeDiscussionBoardViewOnCompany
{
    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 company site '{0}':\n{1}\n{2}", url, x.Message, x.StackTrace);
            }
        }

        private void updateImpl(string url)
        {
            //this.info("Opening Condo '{0}'...", url);
            using (var site = new SPSite(url))
            {
                using (var web = site.OpenWeb())
                {
                    this.fixWebPart(web, url, "Keskustelu");
                }
            }
        }

        private void fixWebPart(SPWeb web, string url, string webPartTitle)
        {
            if (!web.Exists || string.Compare(web.Url, url, true) != 0)
            {
                this.warn("Site '{0}' doesn't exist. It will be ignored", url);
                return;
            }

            if (!PublishingWeb.IsPublishingWeb(web))
            {
                this.warn("Site '{0}' is not publishing web. It will be ignored", url);
                return;
            }
            var pweb = PublishingWeb.GetPublishingWeb(web);
            //this.info("Condo '{0}' was sucessfully opened", url);

            this.fixView(pweb);
        }

        private void fixView(PublishingWeb pweb)
        {
            try
            {
                //this.info("Get start page");
                var file = pweb.DefaultPage;
                if (file == null)
                {
                    this.error("Start page is null. Site won't be updated");
                    return;
                }
                
                if (file.CheckOutStatus == SPFile.SPCheckOutStatus.None)
                {
                    //this.info("Checkout start page");
                    file.CheckOut();
                }
                else
                {
                    // if file was checked out by another user, need undo check out and check in again in order to avoid errors
                    // when add web part
                    //this.info("Start page is already checked out. Undo previous check out and check out it again");
                    file.UndoCheckOut();
                    file.CheckOut();
                }

                var list = pweb.Web.Lists.Cast<SPList>().FirstOrDefault(l => l.Title == "Keskustelu" || l.Title == "Huomioitavaa ja kommentteja");
                if (list != null)
                {
                    // View element on the default.aspx creates hidden view with BaseViewID = 3
                    var view = list.Views.Cast<SPView>().LastOrDefault(v => v.BaseViewID == "3" && v.Hidden);
                    var ctId = new SPContentTypeId("0x012001");
                    if (view != null && view.ContentTypeId != ctId)
                    {
                        view.ContentTypeId = ctId;
                        view.Update();
                    }
                    else
                    {
                        this.warn("Hidden view of list '{0}' not found. View won't be changed", list.Title);
                    }
                }
                else
                {
                    this.warn("Lists 'Keskustelu' or 'Huomioitavaa ja kommentteja' not found. View won't be changed");
                }

                //this.info("Checkin file");
                file.Update();
                file.CheckIn("Change discussion board view");
                if (file.Item.ParentList.EnableMinorVersions)
                {
                    file.Publish("Change discussion board view");
                }
                //this.info("Web part was sucessfully updated");
            }
            catch (Exception x)
            {
                this.error("Error occured when update discussion list view on '{0}' site:\n{1}\n{2}", pweb.Web.Url, x.Message, x.StackTrace);
                var file = pweb.DefaultPage;
                if (file.CheckOutStatus != SPFile.SPCheckOutStatus.None)
                {
                    file.UndoCheckOut();
                }
            }
        }

        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 });
            }
        }
    }
}