using UnityEngine;
using UnityEngine.UI;
using TMPro;

public class GlucoseHUD : MonoBehaviour
{
    [Header("UI")]
    public Image fillBar;
    public TextMeshProUGUI percentageText;

    [Header("Colors")]
    public Color highRedColor = new Color(1f, 0.3f, 0.3f);   // >70% RED
    public Color lowRedColor  = new Color(1f, 0.3f, 0.3f);   // <33% RED
    public Color normalGreen  = new Color(0.5f, 1f, 0.2f);   // 60%~33%
    public Color midOrange    = new Color(1f, 0.6f, 0.2f);   // ORANGE：70–60% & 40–33%

    [Header("Blink Settings")]
    public float blinkSpeed = 5f;       // Blink speed
    public float blinkMin = 0.4f;       // min brightness
    public float blinkMax = 1.0f;       // max brightness

    void Update()
    {
        float g = GlucoseManager.Instance.glucose; // 0~1

        // fill amount
        fillBar.fillAmount = g;

        // percentage text
        percentageText.text = Mathf.RoundToInt(g * 216) + "mg/dl";

        // ---- color logic ----
        // high glucose RED
        if (g > 0.80f)
        {
            fillBar.color = highRedColor;
        }
        // high orange
        else if (g > 0.70f)
        {
            fillBar.color = midOrange;
        }
        // normal green
        else if (g > 0.40f)
        {
            fillBar.color = normalGreen;
        }
        // low orange
        else if (g > 0.33f)
        {
            fillBar.color = midOrange;
        }
        else
        {
            // ---- Danger Zone (<33%) → Blinking Red ----

            float t = (Mathf.Sin(Time.time * blinkSpeed) + 1f) / 2f; 
            float intensity = Mathf.Lerp(blinkMin, blinkMax, t);

            fillBar.color = lowRedColor * intensity