using System;
using System.Linq.Expressions;
using InABox.Core;

namespace Comal.Classes
{
    /// <summary>
    ///     An EquipmentAssignment represents an anticipated booking for an equipment item, much like a diary entry
    ///     <exclude />
    /// </summary>
    [UserTracking("Assignments")]
    [Caption("Assignments")]
    public class EquipmentAssignment : Entity, IPersistent, IRemotable, INumericAutoIncrement<EquipmentAssignment>, IOneToMany<Equipment>, IOneToMany<Job>,
        ILicense<SchedulingControlLicense>, IOneToMany<Invoice>, IJobScopedItem
    {
        [IntegerEditor(Editable = Editable.Hidden)]
        [EditorSequence(1)]
        public int Number { get; set; }

        [DateEditor]
        [EditorSequence(2)]
        public DateTime Date { get; set; }

        [EntityRelationship(DeleteAction.Cascade)]
        [EditorSequence(3)]
        public EquipmentLink Equipment { get; set; }
        
        [MemoEditor]
        [EditorSequence(6)]
        public string Description { get; set; }
        
        [EditorSequence(9)]
        public JobLink JobLink { get; set; }
        
        [EditorSequence(10)]
        public JobScopeLink JobScope { get; set; }
        
        [EditorSequence(11)]
        [CoreTimeEditor]
        public TimeBlock Booked { get; set; }

        [EditorSequence(12)]
        [CoreTimeEditor]
        public TimeBlock Actual { get; set; }
        
        [TimestampEditor]
        [RequiredColumn]
        [EditorSequence(13)]
        public DateTime Completed { get; set; }
        
        [EditorSequence("Processing",1)]
        public ActualCharge Charge { get; set; }
        
        [TimestampEditor]
        [EditorSequence("Processing",2)]
        public DateTime Processed { get; set; }
        
        [NullEditor]
        [EntityRelationship(DeleteAction.SetNull)]
        public InvoiceLink Invoice { get; set; }
        
        
        public Expression<Func<EquipmentAssignment, int>> AutoIncrementField()
        {
            return x => x.Number;
        }

        public Filter<EquipmentAssignment> AutoIncrementFilter()
        {
            return null;
        }
        
        public static TimeSpan EffectiveTime(TimeSpan actual, TimeSpan booked) => actual.Ticks != 0L ? actual : booked; 

        public TimeSpan EffectiveStartTime()
        {
            return EffectiveTime(Actual.Start, Booked.Start);
        }
        public DateTime EffectiveStart()
        {
            return Date.Add(EffectiveStartTime());
        }

        public TimeSpan EffectiveFinishTime()
        {
            // If we have an actual finish, always use that
            // otherwise use EffectiveStart() + booked.duration
            return EffectiveTime(
                    Actual.Finish,
                    EffectiveTime(Actual.Start, Booked.Start)
                        .Add(Booked.Duration)
                );
        }
        public DateTime EffectiveFinish()
        {
            return Date.Add(
                EffectiveFinishTime()
            );
        }
        
        static EquipmentAssignment()
        {
            //LinkedProperties.Register<EquipmentAssignment, ActivityCharge, bool>(ass => ass.Equi.Charge, chg => chg.Chargeable, ass => ass.Charge.Chargeable);
            Classes.JobScope.LinkScopeProperties<EquipmentAssignment>();
        }
        
    }

}