using System;
using System.Collections.Generic;
using System.Linq;
using InternshipSystem.Core.Entity.Internship;
using InternshipSystem.Core.UglyOrmArtifacts;

namespace InternshipSystem.Core
{
    public class Edition
    {
        public Guid Id { get; set; }
        public DateTime EditionStart { get; set; }
        public DateTime EditionFinish { get; set; }
        public DateTime ReportingStart { get; set; }
        public Course Course { get; set; }
        public List<Internship> Internships { get; set; }
        public List<EditionSubject> AvailableSubjects { get; set; }
        public List<EditionInternshipType> AvailableInternshipTypes { get; set; }

        public bool IsOpen => EditionFinish < DateTime.Today;
        
        public Edition CreateEdition(DateTime start, DateTime end, DateTime reportingStart)
        {
            return new Edition
            {
                EditionStart = start,
                EditionFinish = end,
                ReportingStart = reportingStart
            };
        }

        public void RegisterInternship(Student student)
        {
            if (Internships.Any(i => i.Student.Id == student.Id))
            {
                throw new ArgumentException("error.registration.already_registered");
            }
            
            var internship = Internship.CreateStudentsInternship(student);
            
            Internships.Add(internship);
        }

        public bool IsDateDuringEdition(DateTime start, DateTime end)
        {
            return start >= EditionStart && end <= EditionFinish;
        }

        public bool IsTypeAvailable(InternshipType internshipType)
        {
            return AvailableInternshipTypes.Any(e => e.InternshipType == internshipType);
        }

        public bool AreSubjectsAvailable(IEnumerable<long> internshipSubjects)
        {
            return internshipSubjects.All(s => AvailableSubjects.Any(su => su.InternshipSubjectId == s));
        }
    }
}