OnTime.cs

using System;
using System.Threading.Tasks;
using System.Xml;
using Waher.Content;
using Waher.Persistence.Attributes;
using Waher.Service.IoTBroker.StateMachines.Model.Attributes;
 
namespace Waher.Service.IoTBroker.StateMachines.Model.Events
{
    public class OnTime : TimedEventNode
    {
        private ScriptableTimeSpanAttribute value;
 
        public OnTime()
            : base()
        {
        }
 
        [DefaultValueNull]
        public string ValueDefinition
        {
            get => this.value?.Definition;
            set => this.value = new ScriptableTimeSpanAttribute(value, this);
        }
 
        public override string LocalName => nameof(OnTime);
 
        public override IStateMachineNode Create()
        {
            return new OnTime();
        }
 
        public override Task Parse(XmlElement Xml)
        {
            this.value = new ScriptableTimeSpanAttribute(Xml.InnerText, this);
 
            return base.Parse(Xml);
        }
 
        public override async Task<EventTimepoint> GetEventTimepoint(EvaluationArguments Arguments)
        {
            if (this.value is null)
                return new EventTimepoint();
            else
            {
                TimeSpan TS = await this.value.Evaluate(Arguments.Variables);
                DateTime Now = DateTime.Now;
                DateTime TP = Now.Date.Add(TS);
 
                if (TP < Now)
                    TP = TP.AddDays(Math.Ceiling(Now.Subtract(TP).TotalDays));
 
                return new EventTimepoint(Now, TP, everyDay);
            }
        }
 
        private static readonly Duration everyDay = Duration.FromDays(1);
 
        public override string Label => this.value.Definition;
    }
}