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

public class DamageTextController : MonoBehaviour
{
    private TextMeshPro text;

    [SerializeField] public float holdTime = 1.0f;
    [SerializeField] public float fadeTime = 1.0f;
    [SerializeField] public float shakeTime = 1.0f;
    [SerializeField] public float shakeTick = 0.05f;
    [SerializeField] public float shakeTransposeX = 0.05f;
    [SerializeField] public float shakeTransposeY = 0f;

    private bool shouldShake = true;

    private Vector3 originalPosition;

    private void Awake() {
        text = transform.GetComponent<TextMeshPro>();
        originalPosition = transform.position;
    }

    public void Setup(int amount) {
        text.SetText(amount.ToString());
    }

    // Start is called before the first frame update
    void Start()
    {
        StartCoroutine("Shake");
        Invoke("StartFadeOut", holdTime);
        shouldShake = true;
        Invoke("StopShake", shakeTime);
        // Appear over other damage text.
        transform.SetAsLastSibling();
    }

    void StopShake() {
        shouldShake = false;
    }

    IEnumerator Shake() {
        while (shouldShake) {
            transform.position = new Vector2(originalPosition.x + shakeTransposeX * Random.Range(-1.0f, 1.0f),
                                             originalPosition.y + shakeTransposeY * Random.Range(-1.0f, 1.0f));
            yield return new WaitForSeconds(shakeTick);
        }
        transform.position = originalPosition;
    }

    public void StartFadeOut() {
        StartCoroutine("FadeOut");
    }

    IEnumerator FadeOut() {
        for (float i = fadeTime; i >= 0; i -= Time.deltaTime) {
            text.alpha = i / fadeTime;
            yield return null;
        }
        Destroy(gameObject);
    }
}