cirnogodot/Scripts/Actors/Destructible3D.cs

using System;
using System.Linq;
using Cirno.Scripts.Controllers;
using Cirno.Scripts.Resources;
using Cirno.Scripts.Resources.Loot;
using Cirno.Scripts.Utils;
using Cirno.Scripts.Weapons;
using Godot;
using Godot.Collections;

namespace Cirno.Scripts.Actors;

[Tool]
public partial class Destructible3D : StaticBody3D, IDestructible
{
    [Export] public bool Indestructible { get; protected set; }
    [Export] public float Health { get; protected set; } = 1f;

    [Export] public PackedScene DebrisScene { get; set; }

    [Export] public PackedScene ExplosionParticles { get; set; }
    [Export] public BulletResource ExplosionData { get; set; }

    [Export] public BulletOwner BulletGroup { get; set; } = BulletOwner.None;
    [Export] public Array<DamageResistance> DamageResistances { get; set; } = [];

    [ExportCategory("On Death Activation")]
    [Export]
    public ActivationType ActivationType { get; protected set; } = ActivationType.Toggle;

    [Export] public Node Target { get; private set; }
    [Export] public string TargetGroup { get; protected set; }

    [ExportCategory("Loot Drops")]
    [Export] public Array<LootDrop> LootDrops { get; set; } = [];
    /// <summary>Radius of the circle in which dropped items are scattered uniformly.</summary>
    [Export] public float LootScatterRadius { get; set; } = 1.0f;
    /// <summary>Initial upward speed applied to each dropped item so it pops up before falling.</summary>
    [Export] public float LootLaunchUpSpeed { get; set; } = 3.0f;

    [Signal]
    public delegate void ExplodedEventHandler();

    private float _currentHealth = 0f;
    private bool _isDestroyed = false;
    private readonly RandomNumberGenerator _rng = new();

    public override void _Ready()
    {
        _currentHealth = Health;
    }

    public virtual void _func_godot_apply_properties(Dictionary<string, Variant> props)
    {
        SetProperties(props);
    }

    protected void SetProperties(Dictionary<string, Variant> props)
    {
        if (props.TryGetValue("target", out var target))
        {
            TargetGroup = target.AsString();
        }


        if (props.TryGetValue("activationtype", out var type))
        {
            var stringType = type.AsString();
            var t = Enum.TryParse(stringType, true, out ActivationType activationType);
            if (t)
            {
                ActivationType = activationType;
            }
        }

        if (props.TryGetValue("indestructible", out var indestructible))
        {
            var ind = indestructible.AsBool();
            Indestructible = ind;
        }

        if (props.TryGetValue("health", out var health))
        {
            var h = health.AsSingle();
            Health = h;
        }
    }

    private void Explode()
    {
        //ApplyExplosionDamage();
        EmitSignal(SignalName.Exploded, this, _currentHealth);
        ActivateOnDeath();
        CreateExplosion();
        CreateParticles();
        CreateDebris();
        DropLoot();

        QueueFree();

        //GameManager.Instance.RebakeNavigation();
        //GameManager.Instance.RecalculateTilemap(this.GlobalPosition);
    }

    private void ActivateOnDeath()
    {
        if (Target is IActivable node)
        {
            node.Activate(ActivationType);
        }

        if (!string.IsNullOrWhiteSpace(TargetGroup))
        {
            ActivationHelper.UseTargets(this, TargetGroup, ActivationType);
        }
    }

    private void CreateExplosion()
    {
        if (ExplosionData == null) return;

        var explosion = PoolingManager.Instance.SpawnBullet<Bullet3D>(ExplosionData);
        explosion.GlobalPosition = this.GlobalPosition;

        explosion.Speed = 0;

        explosion.Initialize(ExplosionData.MakeBullet(new Vector2(this.GlobalPosition.X, this.GlobalPosition.Y)));
    }

    private void CreateDebris()
    {
        if (DebrisScene == null) return;
        this.CreateSibling<Destructible3D>(DebrisScene);
    }

    private void CreateParticles()
    {
        if (ExplosionParticles == null)
        {
            return;
        }

        var particle = this.CreateSibling<GpuParticles3D>(ExplosionParticles);
        if (particle == null) return;

        particle.Emitting = true;
    }

    private void DropLoot()
    {
        LootDropHelper.SpawnDrops(LootDrops, this, GlobalPosition, LootScatterRadius, LootLaunchUpSpeed, _rng);
    }


    public void Hit(float damage, DamageType damageType = DamageType.Neutral)
    {
        if (_isDestroyed || Indestructible) return;

        var dmg = DamageResistances.Aggregate(damage,
            (current, resistance) => current * resistance.CalculateDamage(current, damageType));

        _currentHealth -= dmg;
        if (_currentHealth > 0) return;
        _isDestroyed = true;
        Explode();
    }

    public bool IsDestroyed()
    {
        return _isDestroyed;
    }
}