using System.Collections;
using UnityEngine;

// ReSharper disable once CheckNamespace
namespace BlueWaterProject
{
    public class CombatHealth : MonoBehaviour, IDamageable
    {
        // Components
        private SpriteRenderer flashWhiteSpriteRenderer;
        
        // Health
        [SerializeField] private int maxHp;
        [SerializeField] private int currentHp;
        [SerializeField] private float takeDamageCoolDown = 0.5f;
        
        // Variables
        private WaitForSeconds flashWhiteWaitTime;
        private bool enableTakeDamage = true;
        
        // Hashes
        private static readonly int IsHitHash = Shader.PropertyToID("_IsHit");
        
        // events
        public delegate void ChangedCurrentHp(int currentHp);
        public event ChangedCurrentHp OnChangedCurrentHp;

        // Unity events
        private void Start()
        {
            OnChangedCurrentHp += CombatUiManager.Inst.HeartHpUi.SetCurrentHp;
            
            flashWhiteWaitTime = new WaitForSeconds(takeDamageCoolDown * 0.1f);
            SetCurrentHp(maxHp);
        }

        private void OnDestroy()
        {
            if (CombatUiManager.Inst)
            {
                OnChangedCurrentHp -= CombatUiManager.Inst.HeartHpUi.SetCurrentHp;
            }
        }

        // Init
        public void InitComponent(SpriteRenderer spriteRenderer)
        {
            flashWhiteSpriteRenderer = spriteRenderer;
        }
        
        // Events methods
        public void HandleEnableTakeDamage() => enableTakeDamage = true;
        public void HandleDisableTakeDamage() => enableTakeDamage = false;

        // Methods
        public void TakeDamage(float attackerPower, Vector3? attackPos = null)
        {
            if (!enableTakeDamage) return;

            enableTakeDamage = false;
            var changeHp = Mathf.Max(currentHp - (int)attackerPower, 0);
            SetCurrentHp(changeHp);
            
            // 죽었는지 체크
            if (changeHp == 0f)
            {
                Die();
                return;
            }

            StartCoroutine(nameof(FlashWhiteCoroutine));
            StartCoroutine(Utils.CoolDown(takeDamageCoolDown, HandleEnableTakeDamage));
        }

        public void Die()
        {
            CombatUiManager.Inst.GameOverPopupUi.Open();
            Destroy(gameObject);
        }

        public float GetCurrentHp()
        {
            return currentHp;
        }

        private void SetCurrentHp(int value)
        {
            currentHp = value;
            OnChangedCurrentHp?.Invoke(value);
            
            if (currentHp <= 2)
            {
                CameraManager.Inst.CombatCamera.LowHpVignette();
            }
            else
            {
                CameraManager.Inst.CombatCamera.DefaultHpVignette();
            }
        }

        private void SetMaxHp()
        {
            SetCurrentHp(maxHp);
        }
        
        private IEnumerator FlashWhiteCoroutine()
        {
            for (var i = 0; i < 5; i++)
            {
                flashWhiteSpriteRenderer.material.SetInt(IsHitHash, 1);
                yield return flashWhiteWaitTime;
                flashWhiteSpriteRenderer.material.SetInt(IsHitHash, 0);
                yield return flashWhiteWaitTime;
            }
        }
    }
}