using System;
using InABox.Core;

namespace Comal.Classes
{
    [UserTracking(typeof(Qualification))]
    public class EmployeeQualification : Entity, IRemotable, IPersistent, IManyToMany<Employee, Qualification>, ILicense<HumanResourcesLicense>,
        IExportable, IImportable
    {
        [EditorSequence(0)]
        [EntityRelationship(DeleteAction.Cascade)]
        public EmployeeLink Employee { get; set; }

        [EditorSequence(1)]
        [EntityRelationship(DeleteAction.Cascade)]
        public QualificationLink Qualification { get; set; }

        [EditorSequence(2)]
        public string QualificationNumber { get; set; }

        [DateEditor]
        [EditorSequence(3)]
        public DateTime Qualified { get; set; }

        [DateEditor]
        [EditorSequence(4)]
        public DateTime Expiry { get; set; }

        [EditorSequence(5)]
        public ImageDocumentLink FrontPhoto { get; set; }

        [EditorSequence(6)]
        public ImageDocumentLink BackPhoto { get; set; }

        [TimestampEditor]
        [EditorSequence(7)]
        public DateTime Verified { get; set; }

        protected override void DoPropertyChanged(string name, object? before, object? after)
        {
            base.DoPropertyChanged(name, before, after);
            if (name.Equals(nameof(Qualified)))
                Expiry = CalculateExpiry((DateTime)after, Qualification.Renewal, Qualification.Period, Expiry);
        }

        public DateTime CalculateExpiry(DateTime start, QualificationRenewal renewal, int period, DateTime expiry)
        {
            if (renewal == QualificationRenewal.Permanent)
                return DateTime.MaxValue;

            if (renewal == QualificationRenewal.Days)
                return start.AddDays(period);

            if (renewal == QualificationRenewal.Weeks)
                return start.AddDays(period * 7);

            if (renewal == QualificationRenewal.Months)
                return start.AddMonths(period);

            if (renewal == QualificationRenewal.Years)
                return start.AddYears(period);

            return expiry.Equals(DateTime.MaxValue) || expiry.Equals(DateTime.MinValue) ? DateTime.Today : expiry;
        }
    }
}