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

namespace Comal.Classes
{
    //public class DeliveryAssignments : CoreAggregate<Assignment, Delivery, Guid>
    //{
    //    public override Expression<Func<Delivery, Guid>> Aggregate => Delivery => Delivery.ID;
    //    //public Expression<Func<Delivery, Guid>> Link => x => x.Assignment.ID;
    //    public override AggregateCalculation Calculation => AggregateCalculation.Count;

    //    public override Dictionary<Expression<Func<Delivery, object>>, Expression<Func<Assignment, object>>> Links =>
    //        new Dictionary<Expression<Func<Delivery, object>>, Expression<Func<Assignment, object>>>
    //        {
    //            { Delivery => Delivery.Assignment.ID, x => x.ID }
    //        };
    //}

    /// <summary>
    ///     An assignment represents an anticipated booking for an employee, much like a diary entry
    ///     <exclude />
    /// </summary>
    [UserTracking("Assignments")]
    [Caption("Assignments")]
    public class Assignment : Entity, IPersistent, IRemotable, INumericAutoIncrement<Assignment>, IOneToMany<Employee>, IOneToMany<Job>,
        IOneToMany<Kanban>, ILicense<SchedulingControlLicense>, IJobActivity, IOneToMany<Invoice>
    {
        private bool bChanging;

        [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 EmployeeLink EmployeeLink { get; set; }

        [TextBoxEditor]
        [EditorSequence(4)]
        public string Title { get; set; }

        [MemoEditor]
        [EditorSequence(5)]
        public string Description { get; set; }

        [EditorSequence(6)]
        public AssignmentActivityLink ActivityLink { get; set; }

        [EditorSequence(7)]
        [EntityRelationship(DeleteAction.SetNull)]
        public KanbanLink Task { get; set; }

        [EditorSequence(8)]
        public JobLink JobLink { get; set; }

        [EditorSequence(9)]
        public JobITPLink ITP { get; set; }

        [NullEditor]
        [Obsolete("Replaced with Actual.Start", true)]
        public TimeSpan Start { get; set; }

        [NullEditor]
        [Obsolete("Replaced with Actual.Duration", true)]
        public TimeSpan Duration { get; set; }

        [NullEditor]
        [Obsolete("Replaced with Actual.Finish", true)]
        public TimeSpan Finish { get; set; }

        [EditorSequence(10)]
        [CoreTimeEditor]
        public CoreTime Booked { get; set; }

        [EditorSequence(11)]
        [CoreTimeEditor]
        public CoreTime Actual { get; set; }

        [TimestampEditor]
        [EditorSequence(12)]
        public DateTime Completed { get; set; }

        [TimestampEditor]
        [EditorSequence(13)]
        public DateTime Processed { get; set; }

        [NullEditor]
        [EntityRelationship(DeleteAction.Cascade)]
        public LeaveRequestLink LeaveRequestLink { get; set; }

        [NullEditor]
        public DeliveryLink Delivery { get; set; }

        [NullEditor]
        [EntityRelationship(DeleteAction.SetNull)]
        public InvoiceLink Invoice { get; set; }

        public Expression<Func<Assignment, int>> AutoIncrementField()
        {
            return x => x.Number;
        }

        public Filter<Assignment> AutoIncrementFilter()
        {
            return null;
        }


        protected override void Init()
        {
            base.Init();
            JobLink = new JobLink();
            ITP = new JobITPLink();
            EmployeeLink = new EmployeeLink();
            LeaveRequestLink = new LeaveRequestLink();
            ActivityLink = new AssignmentActivityLink();
            Invoice = new InvoiceLink();
            Delivery = new DeliveryLink();
            Task = new KanbanLink();
            Booked = new CoreTime();
            Actual = new CoreTime();
        }

        public DateTime EffectiveStart()
        {
            if (Actual.Start.Ticks != 0)
                return Date.Add(Actual.Start);
            else
                return Date.Add(Booked.Start);
        }

        public DateTime EffectiveFinish()
        {
            if (Actual.Finish.Ticks != 0)
                return Date.Add(Actual.Finish);
            else if (Actual.Start.Ticks != 0)
                return Date.Add(Actual.Start).Add(Booked.Duration);
            else
                return Date.Add(Booked.Finish);
        }
    }
}