using System;
using System.Collections.Generic;
using System.Linq;
using Zurnal.Presence

namespace Zurnal.Presence
{
    internal class UseCasePresence
    {
        private List<AttendanceRecord> attendanceRecords;

        public UseCasePresence(List<AttendanceRecord> attendanceRecords)
        {
            this.attendanceRecords = attendanceRecords;
        }

        public List<AttendanceRecord> GetAttendanceByGroup(string groupNumber)
        {
            return attendanceRecords.Where(record => record.GroupNumber == groupNumber).ToList();
        }

        public List<AttendanceRecord> GetAttendanceByGroupAndDate(string groupNumber, DateTime date)
        {
            return attendanceRecords.Where(record => record.GroupNumber == groupNumber && record.Date.Date == date.Date).ToList();
        }

        public void MarkUserAsAbsent(string groupNumber, int firstLesson, int lastLesson, DateTime date)
        {
            foreach (var lesson in Enumerable.Range(firstLesson, lastLesson - firstLesson + 1))
            {
                var record = attendanceRecords.FirstOrDefault(r => r.GroupNumber == groupNumber && r.LessonNumber == lesson && r.Date.Date == date.Date);
                if (record != null)
                {
                    record.IsPresent = false;
                }
            }
        }
    }
}