using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Tango.BL;
using Tango.Core;
using Tango.PPC.Common.UpdatePackages;
using Tango.PPC.Shared.Updates;

namespace Tango.PPC.Packages.Auth2
{
    [PPCPackage(PackageType.Pre, "Applying Auth2 Patch", false)]
    public class Auth2 : ExtendedObject, IPPCPackage
    {
        public Task Run(PackageContext context)
        {
            return Task.Factory.StartNew(() =>
            {
                LogManager.Log("Starting Auth2 package procedure...");

                using (ObservablesContext db = ObservablesContext.CreateDefault())
                {
                    using (var transaction = db.Database.BeginTransaction())
                    {
                        LogManager.Log("Setting all jobs users to null...");
                        context.ReportProgress("Modifying jobs...");
                        db.Database.ExecuteSqlCommand("ALTER TABLE JOBS ALTER COLUMN USER_GUID VARCHAR(36) NULL");
                        db.Database.ExecuteSqlCommand("UPDATE JOBS SET USER_GUID = NULL");

                        Thread.Sleep(1000);

                        LogManager.Log("Setting all job runs users to null...");
                        context.ReportProgress("Modifying job runs...");
                        db.Database.ExecuteSqlCommand("UPDATE JOB_RUNS SET USER_GUID = NULL");

                        Thread.Sleep(1000);

                        LogManager.Log("Setting all events users to null...");
                        context.ReportProgress("Modifying events...");
                        db.Database.ExecuteSqlCommand("UPDATE MACHINES_EVENTS SET USER_GUID = NULL");

                        Thread.Sleep(1000);

                        LogManager.Log("Removing all users...");
                        context.ReportProgress("Modifying users...");
                        db.Database.ExecuteSqlCommand("DELETE FROM USERS");

                        Thread.Sleep(1000);

                        LogManager.Log("Removing redundant addresses...");
                        context.ReportProgress("Modifying addresses...");
                        db.Database.ExecuteSqlCommand(@"
DELETE ADDRESSES FROM ADDRESSES
FULL JOIN ORGANIZATIONS ON ORGANIZATIONS.ADDRESS_GUID = ADDRESSES.GUID
WHERE ORGANIZATIONS.ADDRESS_GUID IS NULL");

                        Thread.Sleep(1000);

                        LogManager.Log("Removing redundant contacts...");
                        context.ReportProgress("Modifying contacts...");
                        db.Database.ExecuteSqlCommand(@"
DELETE CONTACTS FROM CONTACTS
FULL JOIN ORGANIZATIONS ON ORGANIZATIONS.CONTACT_GUID = CONTACTS.GUID
WHERE ORGANIZATIONS.CONTACT_GUID IS NULL");

                        Thread.Sleep(1000);

                        LogManager.Log("Committing transaction...");
                        context.ReportProgress("Committing transaction...");
                        transaction.Commit();
                    }
                }

            });
        }
    }
}