C# Fundamentals - 03. ManOWar - Mid Exam 06.09.2020

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

namespace _06._09._2019___Mid_Exam
{
    class ManOWar
    {
        static void Main()
        {
            List<int> pirateShip = Console.ReadLine()
                                   .Split('>')
                                   .Select(int.Parse)
                                   .ToList();

            List<int> warShip = Console.ReadLine()
                                   .Split('>')
                                   .Select(int.Parse)
                                   .ToList();

            int maximumHealth = int.Parse(Console.ReadLine());

            string command = Console.ReadLine();
            while (command != "Retire")
            {
                string[] currentCommand = command.Split();
                string instruction = currentCommand[0];

                if (instruction == "Fire")
                {
                    int index = int.Parse(currentCommand[1]);
                    int dmg = int.Parse(currentCommand[2]);

                    if (0 <= index && index < warShip.Count)
                    {
                        warShip[index] -= dmg;
                        if (warShip[index] <= 0)
                        {
                            Console.WriteLine("You won! The enemy ship has sunken.");
                            return;
                        }
                    }
                }

                else if (instruction == "Defend")
                {
                    int startIndex = int.Parse(currentCommand[1]);
                    int endIndex = int.Parse(currentCommand[2]);
                    int dmg = int.Parse(currentCommand[3]);

                    bool isStartValid = 0 <= startIndex && startIndex < endIndex;
                    bool isEndValid = startIndex < endIndex && endIndex < pirateShip.Count;

                    if (isStartValid && isEndValid)
                    {
                        for (int i = startIndex; i <= endIndex; i++)
                        {
                            pirateShip[i] -= dmg;
                            if (pirateShip[i] <= 0)
                            {
                                Console.WriteLine("You lost! The pirate ship has sunken.");
                                return;
                            }
                        }
                    }
                }

                else if (instruction == "Repair")
                {
                    int index = int.Parse(currentCommand[1]);
                    int health = int.Parse(currentCommand[2]);

                    bool isIndexValid = 0 <= index && index < pirateShip.Count;

                    if (isIndexValid)
                    {
                        pirateShip[index] += health;
                        if (pirateShip[index] > maximumHealth)
                        {
                            pirateShip[index] = maximumHealth;
                        }
                    }
                }

                else if (instruction == "Status")
                {
                    int count = 0;
                    double needRepair = maximumHealth * 0.20;

                    for (int i = 0; i < pirateShip.Count; i++)
                    {
                        if (pirateShip[i] < needRepair)
                        {
                            count += 1;
                        }
                    }

                    Console.WriteLine($"{count} sections need repair.");
                }

                command = Console.ReadLine();
            }

            bool isStalemate = pirateShip.Count > 0 && warShip.Count > 0;

            if (isStalemate)
            {
                Console.WriteLine($"Pirate ship status: {pirateShip.Sum()}");
                Console.WriteLine($"Warship status: {warShip.Sum()}");
            }
        }
    }
}