using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PegLegIoEnemyController : MonoBehaviour {
    [SerializeField] AudioClip ouch;
    [SerializeField] int health = 5;
    [SerializeField] float hurtTime = 0.5f;
    [SerializeField] int points = 100;
    [SerializeField] int hitPoints = 10;
    [SerializeField] int healthBlinkThreshold = 0;
    [SerializeField] int healthGlitterThreshold = 0;
    [SerializeField] GameObject deathExplosion;
    [SerializeField] GameObject scoreObject;

    Animator animator;
    AudioSource audioSource;
    PLIGameController game;
    SpriteRenderer spriteRenderer;

    bool isHurting = false;
    bool isAnimated = true;

    // Start is called before the first frame update
    void Start()
    {
        game = GameObject.FindGameObjectWithTag("PegLegIoGame").GetComponent<PLIGameController>();
        animator = GetComponent<Animator>();
        audioSource = game.GetComponent<AudioSource>();
        spriteRenderer = GetComponent<SpriteRenderer>();
        StartCoroutine(Blink());
        if (animator == null || !animator.isActiveAndEnabled) isAnimated = false;
    }

    public void Hurt(int damage, bool overrideIFrame = false) {
        StartCoroutine(HurtCoroutine(damage, overrideIFrame));
    }

    IEnumerator OneBlink() {
        spriteRenderer.color = Color.red;
        yield return new WaitForSeconds(0.05f);
        spriteRenderer.color = Color.white;
    }

    IEnumerator Blink() {
        int blinkCounter = 0;
        const int maxBlink = 2; // divisor for super-fast blink speed
        while (true) {
            if (health < healthBlinkThreshold) {
                blinkCounter = (blinkCounter + 1) % maxBlink;
                if (health < healthGlitterThreshold
                    || blinkCounter == 0) {
                    StartCoroutine(OneBlink());
                }
            }
            yield return new WaitForSeconds(0.2f);
        }
    }

    public IEnumerator HurtCoroutine(int damage, bool overrideIFrame) {
        if (!isHurting || overrideIFrame) {
            audioSource.PlayOneShot(ouch);
            if (isAnimated) animator.SetBool("isHurting", true);
            health -= damage;
            game.Score(hitPoints);
            if (health < 1) {
                Die();
            } else {
                isHurting = true;
                yield return new WaitForSeconds(hurtTime);
                isHurting = false;
                if (isAnimated) animator.SetBool("isHurting", false);
            }
        }
    }

    void Die() {
        GameObject e = Instantiate(deathExplosion);
        GameObject s = Instantiate(scoreObject);
        e.transform.position = transform.position;
        s.transform.position = transform.position;
        s.GetComponent<TMPro.TextMeshPro>().SetText(points.ToString());
        Destroy(gameObject);
        game.Score(points);
    }

    // Update is called once per frame
    void Update()
    {
    }
}