task36

using System;
using System.Collections.Generic;
using System.Threading;

public class Program
{
    public static void Main()
    {
        int sleepTime = 1000;
        Aquarium aquarium = new Aquarium();
        bool isLive = true;

        while(isLive)
        {
            aquarium.Update();
            isLive = aquarium.IsLive();
            Thread.Sleep(sleepTime);
        }
    }
}

public class Aquarium
{
    private List<Fish> _fishes;
    private Random _random;
    private long _years;

    private int _lifeAmountMinimum = 15;
    private int _lifeAmountMaximum = 80;
    private int _lifeDecreasePerIterationMinimum = 1;
    private int _lifeDecreasePerIterationMaximum = 5;
    private string[] _names =
    {
        "Char", "Guppy", "Rainbowfish", "Arapaima", "Sea butterfly",
        "Clown fish", "Surgeonfish", "Squid", "Tuna", "Suckerfish"
    };

    public Aquarium()
    {
        _random = new Random();
        _fishes = new List<Fish>();
        _years = 1;
        CreateFishes();
    }

    public void Update()
    {
        Console.Clear();
        PrintFishes();
        ReadKeys();
        DecreaseLife();
        ++_years;
    }

    public bool IsLive()
    {
        if (_fishes.Count > 0)
        {
            Console.WriteLine("Still live");
            return true;
        }
        else
        {
            Console.ForegroundColor = ConsoleColor.Red;
            Console.WriteLine("†††FISHES DEAD†††");
            return false;
        }
    }

    private void CreateFishes()
    {
        for (int i = 0, amountFishes = 2; i < amountFishes; ++i)
            AddFish();
    }

    private void AddFish()
    {
        int nameIndex = _random.Next(_names.Length);
        int life = _random.Next(_lifeAmountMinimum, _lifeAmountMaximum);
        int lifeDecreasePerIteration = _random.Next(_lifeDecreasePerIterationMinimum, _lifeDecreasePerIterationMaximum);

        _fishes.Add(new Fish(_names[nameIndex], life, lifeDecreasePerIteration));
    }

    private void RemoveFish(int index)
    {
        _fishes.RemoveAt(index);
    }

    private void DecreaseLife()
    {
        for (int i = 0; i < _fishes.Count; ++i)
        {
            _fishes[i].DecreaseLife();

            if (_fishes[i].IsDead())
                RemoveFish(i);
        }
    }

    private void PrintFishes()
    {
        Console.WriteLine($"Year : {_years}");
        Console.WriteLine($"Amount of fishes : {_fishes.Count}");
        Console.WriteLine($"\nInput to number : ");
        Console.WriteLine($"0. Add Fish.");
        Console.WriteLine($"1. Remove Fish.");
        Console.WriteLine("\n Fishes : ");

        for (int i = 0; i < _fishes.Count; ++i)
            Console.WriteLine($"{i}.\n{_fishes[i]}");
    }

    private void ReadKeys()
    {
        if (Console.KeyAvailable)
        {
            ConsoleKey key = Console.ReadKey(true).Key;

            if (key.Equals(ConsoleKey.D0))
            {
                AddFish();
            }
            else if (key.Equals(ConsoleKey.D1))
            {
                int index = InputIndex();
                RemoveFish(index);
            }
        }
    }

    private int InputIndex()
    {
        Console.Clear();
        Console.WriteLine($"Amount of fishes : {_fishes.Count}");

        bool isParse = false;
        int result = 0;

        do
        {
            Console.WriteLine("Please input a index of fish : ");
            isParse = int.TryParse(Console.ReadLine(), out result);
        }
        while (isParse != true);

        return result;
    }
}

public class Fish
{
    private string _name;
    private int _life;
    private int _lifeDecreasePerIteration;

    public Fish(string name, int life, int lifeDecreasePerIteration)
    {
        _name = name;
        _life = life;
        _lifeDecreasePerIteration = lifeDecreasePerIteration;
    }

    public void DecreaseLife()
    {
        _life -= _lifeDecreasePerIteration;
    }

    public bool IsDead()
    {
        return _life <= 0;
    }

    public override string ToString()
    {
        string result = "";
        result += "Name fish : " + _name + ".\n";
        result += "Age to live : " + _life + ".\n";
        return result;
    }
}