Disco.Services.JobActionExtensions.OnConvertHWarToHNWar C# (CSharp) Method

        public static void OnConvertHWarToHNWar(this Job j, DiscoDataContext Database)
        {
            if (!j.CanConvertHWarToHNWar())
                throw new InvalidOperationException("Convert HWar to HNWar was Denied");

            var techUser = UserService.CurrentUser;

            // Remove JobMetaWarranty
            if (j.JobMetaWarranty != null)
                Database.JobMetaWarranties.Remove(j.JobMetaWarranty);

            // Add JobMetaNonWarranty
            var metaHNWar = new JobMetaNonWarranty() { Job = j };
            Database.JobMetaNonWarranties.Add(metaHNWar);

            // Swap Job Sub Types
            List<string> jobSubTypes = j.JobSubTypes.Select(jst => jst.Id).ToList();
            j.JobSubTypes.Clear();
            foreach (var jst in Database.JobSubTypes.Where(i => i.JobTypeId == JobType.JobTypeIds.HNWar && jobSubTypes.Contains(i.Id)))
                j.JobSubTypes.Add(jst);

            // Add Components
            var components = Database.DeviceComponents.Include("JobSubTypes").Where(c => !c.DeviceModelId.HasValue || c.DeviceModelId == j.Device.DeviceModelId);
            var jobComponents = new List<DeviceComponent>();
            foreach (var component in components)
            {
                if (component.JobSubTypes.Count == 0)
                {
                    jobComponents.Add(component);
                }
                else
                {
                    foreach (var st in component.JobSubTypes)
                    {
                        foreach (var jst in j.JobSubTypes)
                        {
                            if (st.JobTypeId == jst.JobTypeId && st.Id == jst.Id)
                            {
                                jobComponents.Add(component);
                                break;
                            }
                        }
                        if (jobComponents.Contains(component))
                            break;
                    }
                }
            }
            foreach (var component in jobComponents)
            {
                Database.JobComponents.Add(new JobComponent()
                {
                    Job = j,
                    TechUserId = techUser.UserId,
                    Cost = component.Cost,
                    Description = component.Description
                });
            }

            // Write Log
            JobLog jobLog = new JobLog()
            {
                JobId = j.Id,
                TechUserId = techUser.UserId,
                Timestamp = DateTime.Now,
                Comments = string.Format("# Job Type Converted\r\nFrom: **{0}**\r\nTo: **{1}**", Database.JobTypes.Find(JobType.JobTypeIds.HWar), Database.JobTypes.Find(JobType.JobTypeIds.HNWar))
            };
            Database.JobLogs.Add(jobLog);

            j.JobTypeId = JobType.JobTypeIds.HNWar;
        }
        #endregion