using System;
using System.Linq;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Utilities;
using SPSolutions;
using SPSolutions.SharePoint.Alerts;
using Taloyhtio.CondoUpdate.Common;

namespace CondoUpdate.ChangeImmediateAlertsToSummaryAlerts
{
    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)
        {
            // condo
            fixList(url + "/asukkaille", "/Documents");
            fixList(url + "/osakkaille", "/Documents");
            fixList(url + "/hallitukselle", "/Documents");
            // company
//            fixList(url, "/Documents");
//            fixList(url, "/Lists/Asiakirjojen%20lhetys%20tilitoimistolle");
//            fixList(url, "/Tuntilistat%20ja%20verokortit");
        }

        private void fixList(string webUrl, string listUrl, bool reportErrorIfListNotExists = true)
        {
            //log("Check list '{0}' in web '{1}'", listUrl, webUrl);
            using (var site = new SPSite(webUrl))
            {
                using (var web = site.OpenWeb())
                {
                    SPList list = null;
                    try
                    {
                        string url = SPUrlUtility.CombineUrl(webUrl, listUrl);
                        list = web.GetList(url);
                    }
                    catch
                    {
                    }

                    if (list == null)
                    {
                        if (reportErrorIfListNotExists)
                        {
                            error("List '{0}' can't be found", listUrl);
                        }
                        return;
                    }

                    // get first alert from list (normally in all lists affected by alert creation tool there is only 1 alert)
                    var alert = this.getFirstListAlert(web, list);
                    if (alert == null)
                    {
                        //log("There are no alerts in the list");
                        return;
                    }

                    // get alert template from this list
                    var alertTemplate = alert.AlertTemplate;
                    if (alertTemplate == null)
                    {
                        error("Alert's alert template is null (list '{0}')", listUrl);
                        return;
                    }

                    if (!isCustom(alertTemplate))
                    {
                        error("Alert template '{0}' is not custom (list '{1}')", alertTemplate.DisplayName, listUrl);
                        return;
                    }

                    if (this.isDailySummaryAlert(alert))
                    {
                        // it is already summary alert
                        return;
                    }

                    EnsureAlertProperty(alert, AlertManagerConstants.MAKE_DAILY_SUMMARY_FROM_IMMEDIATE_PROPERTY_BAG_KEY, true);
                    alert.Update();
                }
            }
        }

        private bool isDailySummaryAlert(SPAlert alert)
        {
            if (alert == null || alert.Properties == null ||
                !alert.Properties.ContainsKey(AlertManagerConstants.MAKE_DAILY_SUMMARY_FROM_IMMEDIATE_PROPERTY_BAG_KEY))
            {
                return false;
            }

            bool result = false;
            if (!bool.TryParse(alert.Properties[AlertManagerConstants.MAKE_DAILY_SUMMARY_FROM_IMMEDIATE_PROPERTY_BAG_KEY], out result))
            {
                return false;
            }
            return result;
        }

        // copy of SPSolutions.SharePoint.Alerts.SPAlertUtil.EnsureAlertProperty
//        public static void EnsureAlertProperty(SPAlert alert, string propertyName, string propertyValue)
//        {
//            if (alert.Properties.ContainsKey(propertyName))
//            {
//                alert.Properties[propertyName] = propertyValue;
//                return;
//            }
//            alert.Properties.Add(propertyName, propertyValue);
//        }
        public static void EnsureAlertProperty(SPAlert alert, string propertyName, object propertyValue)
        {
            SPAlertUtil.EnsureAlertProperty(alert, propertyName, propertyValue.ToString());
        }

        private SPAlert getFirstListAlert(SPWeb web, SPList list)
        {
            var alerts = web.Alerts.Cast<SPAlert>();
            return alerts.FirstOrDefault(a => a.ListID == list.ID);
        }

        // This is copy of Alert template's AlertTemplateManager.IsCustom property implementation
        private bool isCustom(SPAlertTemplate t)
        {
            return (((t.Properties["Custom"] != null) && (t.Properties["Custom"] is string)) && (((string)t.Properties["Custom"]) == SPAlertTemplateUtil.CustomAlertTemplateIdentifier));
        }

        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 });
            }
        }
    }
}