public sealed class GameState
{
    public static readonly Lazy<GameState> _instance = new Lazy<GameState>(() => new GameState());
    private GameState() {}
    public static GameState Instance
    {
        get {return _instance.Value;}
    }

    public List<Character> heros = new List<Character>();
    public List<Character> monsters = new List<Character>();
    public List<Character> heroRemove = new List<Character>();
    public List<Character> monsterRemove = new List<Character>();
    public List<Item> heroInventory = new List<Item>();
    public int currentRound = 1;
    public bool gameOver = false;
    public bool herosAIControl = false;
    public bool monstersAIControl = true;
    public bool lastRound = false;
    public int heroPotionsAvailable = 5;
    public int monsterPotionsAvailable = 2;
    public bool BowIsEquippedBy = false;
    public bool SwordIsEquippedBy = false;
    
    //Menu menu = new Menu();

    public void Run()
    {
        Sword heroSword = new Sword();
        Bow bow = new Bow();
        VinFletcher vin = new VinFletcher();
        heroInventory.Add(heroSword);
        heroInventory.Add(bow);
        heros.Add(vin);
        Rounds(currentRound);
        while (gameOver == false)
        {
            int action;
            GameOver();
            if (gameOver == true)
            {
                return;
            }
            if (heros.Any())
            {
                foreach (Character hero in heros)
                {
                    BeginHeroTurn:
                    hero.isTurn = true;
                    Console.Clear();
                    DisplayStatus();
                    if (GameState.Instance.herosAIControl == false)
                    {
                        Menu.BuildMenu(hero);
                    }
                    action = Actions.Instance.GetAction(hero);
                    bool actionPerformed = Actions.Instance.DoAction(hero, action);
                    if (actionPerformed == true)
                    {
                        Console.Clear();
                        DisplayStatus();
                        CheckDead();
                        foreach (Character monster in monsterRemove)
                        {
                            monsters.Remove(monster);
                        }
                        hero.isTurn = false;
                    }
                    else
                    {
                        goto BeginHeroTurn;
                    }
                    if (!monsters.Any())
                    {
                        break;
                    }
                }
            }
            if (monsters.Any() && heros.Any())
            {
                foreach (Character monster in monsters)
                {
                    monster.isTurn = true;
                    Console.Clear();
                    DisplayStatus();
                    if (GameState.Instance.monstersAIControl == false)
                    {
                        Menu.BuildMenu(monster);
                    }
                    action = Actions.Instance.GetAction(monster);
                    Actions.Instance.DoAction(monster, action);
                    Console.Clear();
                    DisplayStatus();
                    CheckDead();
                    foreach (Character hero in heroRemove)
                    {
                        heros.Remove(hero);
                    }
                    if (!heros.Any())
                    {
                        break;
                    }
                    monster.isTurn = false;
                }
            }
        }
    }

    public void DisplayStatus()
    {
        Console.WriteLine("================================= BATTLE =================================");
        foreach (Character hero in GameState.Instance.heros)
        {
            if (hero.isTurn == true)
            {
                Console.ForegroundColor = ConsoleColor.Cyan;
            }
            Console.WriteLine($"{hero.name, -20}    HP: {hero.currentHP}/{hero.maxHP}");
            Console.ForegroundColor = ConsoleColor.White;
        Console.WriteLine("----------------------------------- VS -----------------------------------");
        }
        foreach (Character monster in GameState.Instance.monsters)
        {
            if (monster.isTurn == true)
            {
                Console.ForegroundColor = ConsoleColor.Red;
            }
            if (monster.name == "The Uncoded One")
            {
                Console.WriteLine($"{monster.name, 59}      HP: {monster.currentHP, 2}/{monster.maxHP, -2}");
                Console.ForegroundColor = ConsoleColor.White;
            }
            else
            {
                Console.WriteLine($"{monster.name, 59}        HP: {monster.currentHP}/{monster.maxHP, -2}");
                Console.ForegroundColor = ConsoleColor.White;
            }
        }
    }

    public void CheckDead()
    {
        foreach (Character hero in heros)
        {
            if (hero.currentHP <= 0)
            {
                hero.dead = true;
                heroRemove.Add(hero);
            }
        }

        foreach (Character monster in monsters)
        {
            if (monster.currentHP <= 0)
            {
                monster.dead = true;
                monsterRemove.Add(monster);
            }
        }
    }

    public void GameOver()
    {
        if (currentRound == 3)
        {
            lastRound = true;
        }
        if (!heros.Any())
        {
            gameOver = true;
            MonstersWin();
            return;
        }
        if (!monsters.Any() && lastRound == false)
        {
            currentRound++;
            Console.WriteLine($"Round {currentRound}");
            Rounds(currentRound);
            return;
        }
        if (!monsters.Any() && lastRound == true)
        {
            gameOver = true;
            HerosWin();
            return;
        }
    }

    public void Rounds(int currentRound)
    {
        if (currentRound == 1)
        {
            Skeleton skeleton1 = new Skeleton();
            monsters.Add(skeleton1);
        }
        if (currentRound == 2)
        {
            Console.Clear();
            ColoredConsole.WriteLine("You are victorious in your first battle!", ConsoleColor.Green);
            Thread.Sleep(1500);
            ColoredConsole.WriteLine("\nAs you make your way deeper into the Uncoded One's fortress" 
                    + "\nmore enemies appear to block your way to defeat their master...", ConsoleColor.Cyan);
            Console.WriteLine("\n\nPress Enter to continue...");
            Console.ReadLine();
            Skeleton skeleton1 = new Skeleton();
            Skeleton skeleton2 = new Skeleton();
            Amarok amarok1 = new Amarok();
            monsters.AddRange(skeleton1, skeleton2, amarok1);
        }
        if (currentRound == 3)
        {
            Console.Clear();
            ColoredConsole.WriteLine("You have completed the second battle in your assualt on the"
                    + " Uncoded One's fortress!", ConsoleColor.Green);
            Thread.Sleep(1500);
            ColoredConsole.WriteLine("\nAs you move deeper into the fortress, you come upon two great"
                    + "\nsteel doors set into a wall of stone. You push open the doors, and" 
                    + "\nfind yourself in the Uncoded One's throne room. The Uncoded One stands"
                    + "\nfrom his throne of blackened steel and hisses, \"You have finally"
                    + "\nappeared before me True Programmer. Now you will die, and the world"
                    + "\nwill be mine!\"", ConsoleColor.Cyan);
            Console.WriteLine("\n\nPress Enter to continue...");
            Console.ReadLine();
            Amarok amarok1 = new Amarok();
            Amarok amarok2 = new Amarok();
            Skeleton skeleton1 = new Skeleton();
            Skeleton skeleton2 = new Skeleton();
            Skeleton skeleton3 = new Skeleton();
            UncodedOne uncodedOne = new UncodedOne();
            monsters.AddRange(skeleton1, skeleton2, skeleton3, amarok1, amarok2, uncodedOne);
        }
    }

    public void HerosWin()
    {
        Console.Clear();
        Thread.Sleep(1500);
        ColoredConsole.WriteLine("As you strike the Uncoded One down, the sky brightens and the"
                + " miasma\nsurrounding his dark fortress begins to lift...\n\n", ConsoleColor.Cyan);
        ColoredConsole.Write("You are ", ConsoleColor.Cyan);
        ColoredConsole.WriteLine("VICTORIOUS!\n\n", ConsoleColor.Green);
        ColoredConsole.WriteLine("True Programming has been brough back to the lands, and"
                + " the people\ncan now improve their lives through the various arts of code you\n"
                + "have helped restore...", ConsoleColor.Cyan);
        Console.WriteLine("\nPress Enter to exit your final challenge, True Programmer!");
        Console.ReadLine();
    }

    public void MonstersWin()
    {
        Console.Clear();
        Thread.Sleep(1500);
        ColoredConsole.WriteLine("You have been brutally struck down by the Uncoded One and his evil\n"
                + "minions. This is a devastating loss for the all the people whom you have helped...\n"
                + "The Uncoded One will now reign supreme in unchecked war against the entire land, and\n"
                + "\nTrue Programming may forever be lost...", ConsoleColor.Red);
        Console.ReadLine();
    }
}