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

namespace Comal.Classes
{
    [UserTracking(typeof(Qualification))]
    public class JobQualificationCount : CoreAggregate<JobQualification, JobEmployeeQualification, Guid>
    {
        public override Expression<Func<JobEmployeeQualification, Guid>> Aggregate => x => x.ID;

        public override Dictionary<Expression<Func<JobEmployeeQualification, object>>, Expression<Func<JobQualification, object>>> Links =>
            new Dictionary<Expression<Func<JobEmployeeQualification, object>>, Expression<Func<JobQualification, object>>>()
            {
                { JobEmployeeQualification => JobEmployeeQualification.Required.ID, JobQualification => JobQualification.ID }
            };

        public override AggregateCalculation Calculation => AggregateCalculation.Count;

        public override Filter<JobEmployeeQualification> Filter
        {
            get
            {
                var start = new Filter<JobEmployeeQualification>(x => x.Available.Employee.StartDate).IsEqualTo(DateTime.MinValue)
                    .Or(x => x.Available.Employee.StartDate).IsLessThanOrEqualTo(DateTime.Today);
                var finish = new Filter<JobEmployeeQualification>(x => x.Available.Employee.FinishDate).IsEqualTo(DateTime.MinValue)
                    .Or(x => x.Available.Employee.FinishDate).IsGreaterThanOrEqualTo(DateTime.Today);
                var expiry = new Filter<JobEmployeeQualification>(x => x.Available.Expiry).IsGreaterThanOrEqualTo(DateTime.Today);
                var result = expiry.And(start).And(finish);
                return result;
            }
        }
    }

    [UserTracking(typeof(Qualification))]
    public class JobQualification : Entity, IRemotable, IPersistent, IManyToMany<Job, Qualification>, ILicense<ProjectManagementLicense>
    {
        [EntityRelationship(DeleteAction.Cascade)]
        public JobLink Job { get; set; }

        [EntityRelationship(DeleteAction.Cascade)]
        public QualificationLink Qualification { get; set; }

        [CheckBoxEditor]
        public bool Required { get; set; }

        [IntegerEditor(Visible = Visible.Default, Editable = Editable.Disabled)]
        [Aggregate(typeof(JobQualificationCount))]
        public int Count { get; set; }
    }
}