using System;
using System.Threading.Tasks;
using Babushka.scripts.CSharp.Common.Util;
using Godot;

namespace Babushka.scripts.CSharp.Common.Fight;

public abstract class FighterAction
{
    public class TargetSelection
    {
        // ReSharper disable once MemberHidesStaticFromOuterClass
        public static readonly TargetSelection Skip = new() { skipTargetSelection = () => true };
        public Func<bool> skipTargetSelection = () => false;
    }
    
    public abstract class FighterActionDetail
    {
        public abstract bool DetailComplete();
    }

    private bool _abort = false;

    #region Shortcuts

    protected static FightWorld.FightHappeningData HappeningData =>
        FightWorld.Instance.fightHappeningData ?? throw new NoFightHappeningException();

    #endregion

    /// <summary>
    /// Executes the data modification for the action. This must happen instantly and not via a coroutines or callbacks.
    /// To get a multiple hit effect for one action, use appropriate Visual Manipulation functions in AnimateAction.
    /// </summary>
    public virtual void ExecuteAction()
    {
    }

    /// <summary>
    /// Returns a way to determine, when an action animation is done
    /// </summary>
    /// <returns>
    /// A variant that can be <c>float</c> or <c>Func&lt;bool&gt;</c>.<br/>
    /// When the return type is <c>float</c>, the animation will take the return value amount of seconds.<br/>
    /// When the return type is <c>Func&lt;bool&gt;</c>, the animation will be done, when the function returns true.
    /// </returns>
    public abstract Variant<float, Func<bool>> GetAnimationEnd();

    /// <summary>
    /// Animates the action.
    /// </summary>
    public virtual async Task AnimateAction()
    {
    }

    public void MarkAbort()
    {
        _abort = true;
    }

    public bool MarkedForAbort()
    {
        return _abort;
    }

    public abstract FighterActionDetail? NeededDetail();

    public class Skip : FighterAction
    {
        public override Variant<float, Func<bool>> GetAnimationEnd()
        {
            return 0f;
        }

        public override FighterActionDetail? NeededDetail()
        {
            return null;
        }
    }
}