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

public class ComboTextBehavior : MonoBehaviour
{
    private static Vector2 SpawningRelativePosition
    {
        get
        {
            return new Vector2(0.0f, -160.0f);
        }
    }

    private static Vector2 FadeoutRelativePosition
    {
        get
        {
            return new Vector2(0.0f, -60.0f);
        }
    }

    private const float Lifetime = 0.8f;
    private const float FadeinThreshold = 0.1f;

    private float Age = 0.0f;

    // Start is called before the first frame update
    void Start()
    {
        gameObject.GetComponent<TextMeshProUGUI>().color = new Color(1.0f, 1.0f, 1.0f, 0.0f);
        gameObject.GetComponent<RectTransform>().anchorMin = new Vector2(0.5f, 1.0f);
        gameObject.GetComponent<RectTransform>().anchorMax = new Vector2(0.5f, 1.0f);
    }

    // Update is called once per frame
    void Update()
    {
        Age += Time.deltaTime;

        if (Age > Lifetime)
        {
            Destroy(gameObject);
        }
        else
        {
            float currentAlpha = (Age < FadeinThreshold) ? Mathf.InverseLerp(0.0f, FadeinThreshold, Age) : Mathf.InverseLerp(Lifetime, FadeinThreshold, Age);
            gameObject.GetComponent<TextMeshProUGUI>().color = new Color(1.0f, 1.0f, 1.0f, currentAlpha);
            float scale = Mathf.Lerp(1.0f, 1.5f, currentAlpha);
            gameObject.transform.localScale = new Vector3(scale, scale, scale);
            float currentPosAlpha = Mathf.InverseLerp(0.0f, Lifetime, Age);
            float PosY = Mathf.Lerp(SpawningRelativePosition.y, FadeoutRelativePosition.y, currentPosAlpha);
            gameObject.GetComponent<RectTransform>().anchoredPosition = new Vector2(SpawningRelativePosition.x, PosY);
        }
    }

    // set the number of combo for display
    public void SetComboNumber(int num)
    {
        gameObject.GetComponent<TextMeshProUGUI>().text = "Combo × " + num;
    }
}