using System.Collections.Generic;
using System.Linq;
using Godot;
using SupaLidlGame.Characters;
using SupaLidlGame.Items;

namespace SupaLidlGame.BoundingBoxes
{
    public partial class Hitbox : BoundingBox
    {
        private HashSet<BoundingBox> _ignoreList = new HashSet<BoundingBox>();

        [Signal]
        public delegate void HitEventHandler(BoundingBox box);

        [Export]
        public float Damage { get; set; }

        private bool _isDisabled = false;

        /// <summary>
        /// Getter/setter for the CollisionShape2D's Disabled property.
        /// </summary>
        [Export]
        public bool IsDisabled
        {
            get => _collisionShape.Disabled;
            set
            {
                _isDisabled = value;
                if (_collisionShape is not null)
                {
                    _collisionShape.Disabled = value;
                    if (value)
                    {
                        DamageStartTime = Time.GetTicksMsec();
                    }
                }
            }
        }

        [Export]
        public float Knockback { get; set; }

        public Character Inflictor { get; set; }

        public ulong DamageStartTime { get; set; }

        private CollisionShape2D _collisionShape;

        private bool _isParrying = false;

        public override void _Ready()
        {
            _collisionShape = GetNode<CollisionShape2D>("CollisionShape2D");
            IsDisabled = _isDisabled; // sets _collisionShape.Disabled
        }

        private bool ShouldParry(Hitbox box)
        {
            Node parent = GetParent<Node>();

            // if this hitbox does not even belong to a weapon, skip
            if (parent is not Weapon)
            {
                return false;
            }

            var weapon = parent as Weapon;

            // if we hit a hitbox, we can parry if it can be parried
            if (box.GetParent<Node>() is Weapon other)
            {
                return weapon.IsParryable && other.IsParryable;
            }

            return false;
        }

        public void _on_area_entered(Area2D area)
        {
            if (area is BoundingBox box)
            {
                // we don't want to hurt teammates
                if (Faction != box.Faction)
                {
                    if (!_ignoreList.Contains(box))
                    {
                        _ignoreList.Add(box);
                        EmitSignal(SignalName.Hit, box);
                    }
                }
            }
        }

        public void ResetIgnoreList() => _ignoreList.Clear();

        public bool HasHit(BoundingBox box) => _ignoreList.Contains(box);

        public HashSet<BoundingBox> Hits
        {
            get => _ignoreList;
        }
    }
}