using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SpaceStationRecruitment
{
    class SpaceStation
    {
        private Dictionary<string, Astronaut> data;
        public string Name { get; set; }
        public int Capacity { get; set; }
        public int Count
        {
            get
            {
                return this.data.Count;
            }
        }

        public SpaceStation(string name, int capacity)
        {
            this.Name = name;
            this.Capacity = capacity;
            this.data = new Dictionary<string, Astronaut>(capacity);
        }

        public void Add(Astronaut astronaut)
        {
            if (!data.ContainsKey(astronaut.Name) && data.Count < Capacity)
            {
                data.Add(astronaut.Name, astronaut);
            }
        }

        public bool Remove(string name)
        {
            if (data.ContainsKey(name))
            {
                data.Remove(name);
                return true;
            }
            return false;
        }

        public Astronaut GetOldestAstronaut()
        {
            return data.OrderByDescending(x => x.Value.Age).First().Value;
        }

        public Astronaut GetAstronaut(string name)
        {
            if (data.ContainsKey(name))
            {
                return data[name];
            }
            return null;
        }

        public string Report()
        {
            StringBuilder sb = new StringBuilder();
            sb.AppendLine($"Astronauts working at Space Station {this.Name}:");
            foreach (var astronaut in data)
            {
                sb.AppendLine(astronaut.Value.ToString());
            }
            return sb.ToString().TrimEnd();
        }
    }
}