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

namespace Comal.Classes
{
    [Caption("Labour")]
    public class JobBillOfMaterialsActivity : Entity, IRemotable, IPersistent, IJobActivity, IOneToMany<Job>,
        IOneToMany<JobBillOfMaterials>, ISequenceable, ILicense<ProjectManagementLicense>,
        IProblems<ManagedProblem>
    {
        
        [NullEditor]
        public long Sequence { get; set; }
        
        [EntityRelationship(DeleteAction.Cascade)]
        [Editable(Editable.Hidden)]
        public JobLink JobLink { get; set; }
        
        [EntityRelationship(DeleteAction.Cascade)]
        [Editable(Editable.Hidden)]
        public JobBillOfMaterialsLink BillOfMaterials { get; set; }
        
        [EditorSequence(1)]
        [EntityRelationship(DeleteAction.SetNull)]
        [RequiredColumn]
        public AssignmentActivityLink ActivityLink { get; set; }
        
        [EditorSequence(2)]
        [RequiredColumn]
        [DurationEditor(Summary = Summary.Sum)]
        public TimeSpan Duration { get; set; }
        
        [EditorSequence(3)]
        [CurrencyEditor]
        public double HourlyCost { get; set; }

        [EditorSequence(4)]
        [CurrencyEditor(Summary = Summary.Sum)]
        public double TotalCost { get; set; }
        
        [EditorSequence(5)]
        [RequiredColumn]
        public JobScopeLink Scope { get; set; }
        
        private class JobITPLookup : LookupDefinitionGenerator<JobITP, JobBillOfMaterialsItem>
        {
            public override Filter<JobITP> DefineFilter(JobBillOfMaterialsItem[] items)
            {
                if (items.Length == 1)
                    return new Filter<JobITP>(x => x.Job.ID).IsEqualTo(items.First().Job.ID);
                return LookupFactory.DefineFilter<JobITP>();
            }

            public override Columns<JobBillOfMaterialsItem> DefineFilterColumns()
                => Columns.None<JobBillOfMaterialsItem>().Add(x => x.Job.ID);
        }
        [EditorSequence(6)]
        [EntityRelationship(DeleteAction.SetNull)]
        [LookupDefinition(typeof(JobITPLookup))]
        public JobITPLink ITP { get; set; }
        
        [EditorSequence("Issues", 1)]
        public ManagedProblem Problem { get; set; }
        
        private bool bChanging;
        
        protected override void DoPropertyChanged(string name, object? before, object? after)
        {
            if (bChanging)
                return;

            try
            {
                bChanging = true;

                if (name.Equals(nameof(Duration)) && after is TimeSpan duration)
                    TotalCost = HourlyCost * duration.TotalHours;
                
                else if (name.Equals(nameof(HourlyCost)) && after is double cost)
                    TotalCost = cost * Duration.TotalHours;

                else if (name.Equals(nameof(TotalCost)) && after is double total)
                {
                    if (Duration == TimeSpan.Zero)
                        Duration = TimeSpan.FromHours(1.0);
                    HourlyCost = total / Duration.TotalHours;
                }
            }
            finally
            {
                bChanging = false;
            }
            base.DoPropertyChanged(name, before, after);
        }


    }
}