using System.Collections;
using UnityEngine;

// ReSharper disable once CheckNamespace
namespace BlueWaterProject
{
    public class CombatHealth : MonoBehaviour, IDamageable
    {
        // Components
        private SpriteRenderer spriteRenderer;
        private HeartHpUi heartHpUi;
        private MaterialPropertyBlock propBlock;
        
        // Health
        [SerializeField] private int maxHp;
        [SerializeField] private int currentHp;

        // Interfaces
        private IDashable iDashable;
        
        // Variables
        private WaitForSeconds flashWhiteWaitTime;
        
        // 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()
        {
            heartHpUi = UiManager.Inst.CombatUi.HeartHpUi;
            iDashable = GetComponent<IDashable>();
            
            OnChangedCurrentHp += heartHpUi.SetCurrentHp;

            propBlock = new MaterialPropertyBlock();
            flashWhiteWaitTime = new WaitForSeconds(0.05f);
            SetCurrentHp(maxHp);
        }

        private void OnDestroy()
        {
            OnChangedCurrentHp -= heartHpUi.SetCurrentHp;
        }

        // Init
        public void InitComponent(SpriteRenderer spriteRenderer)
        {
            this.spriteRenderer = spriteRenderer;
        }

        // Methods
        public void TakeDamage(float attackerPower, Vector3? attackPos = null)
        {
            if (iDashable?.IsDashing == true) return;
            
            var changeHp = Mathf.Max(currentHp - (int)attackerPower, 0);
            SetCurrentHp(changeHp);
            
            // 죽었는지 체크
            if (changeHp == 0f)
            {
                Die();
                return;
            }
            
            if (changeHp <= 30f)
            {
                CameraManager.Inst.CombatCamera.LowHpVignette();
            }
            else
            {
                CameraManager.Inst.CombatCamera.StopLowHpVignette();
            }

            StartCoroutine(nameof(FlashWhiteCoroutine));
        }

        public void Die()
        {
            throw new System.NotImplementedException();
        }

        public float GetCurrentHp()
        {
            return currentHp;
        }

        private void SetCurrentHp(int value)
        {
            currentHp = value;
            OnChangedCurrentHp?.Invoke(value);
        }
        
        private IEnumerator FlashWhiteCoroutine()
        {
            for (var i = 0; i < 5; i++)
            {
                spriteRenderer.GetPropertyBlock(propBlock);
                propBlock.SetInt(IsHitHash, 1);
                spriteRenderer.SetPropertyBlock(propBlock);
                yield return flashWhiteWaitTime;
                propBlock.SetInt(IsHitHash, 0);
                spriteRenderer.SetPropertyBlock(propBlock);
                yield return flashWhiteWaitTime;
            }
        }
    }
}