using System;
using UnityEngine;
using UnityEngine.Events;

namespace DamageVolumeSystem
{
    [Icon("Assets/Scripts/DamageVolumeSystem/Icon/HealthData.png")]
    public class HealthData : MonoBehaviour
    {
        public int defaultHealth = 5000;
        public int maxHealth = 5000;

        public UnityEvent<Damage> onAid = new();
        public UnityEvent<Damage> onHurt = new();
        public UnityEvent onDead = new();
    
        private int _health;

        public int Health
        {
            get => _health;
            set
            {
                var offset = value - _health;
                var offsetAbs = Mathf.Abs(offset);
                switch (offset)
                {
                    case > 0:
                        Aid(new Damage
                        {
                            Group = 12,
                            Force = offsetAbs,
                            Direction = Vector3.zero
                        });
                        return;
                    case < 0:
                        Hurt(new Damage
                        {
                            Group = 12,
                            Force = offsetAbs,
                            Direction = Vector3.zero
                        });
                        break;
                }
            }
        }

        private void Start()
        {
            _health = defaultHealth;
        }

        private void Reset()
        {
            var newHealth = Mathf.Clamp(defaultHealth, 0, maxHealth);
            SetHealth(newHealth);
        }

        public void Aid(Damage damage)
        {
            AddHealth(damage.Force);
            onAid.Invoke(damage);
        }

        public void Hurt(Damage damage)
        {
            ReduceHealth(damage.Force);
            onHurt.Invoke(damage);

            if (_health <= 0)
                onDead.Invoke();
        }
        
        public static HealthData operator +(HealthData a, Damage b)
        {
            a.Aid(b);
            return a;
        }
        
        public static HealthData operator -(HealthData a, Damage b)
        {
            a.Hurt(b);
            return a;
        }

        private void SetHealth(int newHealth)
            => _health = Mathf.Clamp(newHealth, 0, maxHealth);
        
        private void AddHealth(int newHealth)
            => _health = Mathf.Clamp(_health + newHealth, 0, maxHealth);
        
        private void ReduceHealth(int newHealth)
            => _health = Mathf.Clamp(_health - newHealth, 0, maxHealth);
    }
}