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

namespace Babushka.scripts.CSharp.Common.Fight;

public class FighterFormation
{
    private readonly List<FightWorld.Fighter?> _fighters;

    public FighterFormation(int slots = 3)
    {
        _fighters = [];
        for (var i = 0; i < slots; i++)
        {
            _fighters.Add(null);
        }
    }

    public FightWorld.Fighter? GetFighterAtPosition(int position)
    {
        Debug.Assert(position >= 0, "position>=0");
        Debug.Assert(position < _fighters.Count, "position does not exist");

        return _fighters[position];
    }

    public void SetFighterAtPosition(int position, FightWorld.Fighter value)
    {
        Debug.Assert(position >= 0, "position>=0");
        Debug.Assert(position < _fighters.Count, "position does not exist");

        _fighters[position] = value;
    }

    public bool ContainsFighter(FightWorld.Fighter fighter)
    {
        return _fighters.Contains(fighter);
    }

    public int GetFirstEmptySlot()
    {
        for (var i = 0; i < _fighters.Count; i++)
        {
            if (_fighters[i] == null)
                return i;
        }

        return -1;
    }

    public int GetEmptySlotCount()
    {
        return _fighters.Count(fighter => fighter == null);
    }
}