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

public class HeroInfoUI : MonoBehaviour
{
    protected GameObject target;
    protected BattleParticipant battleParticipant;
    public Text nameText;
    public Image healthBarBgImage;
    public Image healthBarFgImage;
    public Text hpText;
    public GameObject blockGroup;
    public Text blockText;
    public StatusUI statusUI;

    private int renderedHP = -1;
    private int renderedMaxHP = -1;
    private int renderedBlock = -1;
    private Camera mainCamera;

    private static Color HIGH_HP_COLOR = new Color(0f, 0.8f, 0f);
    private static Color MED_HP_COLOR = new Color(0.8f, 0.8f, 0f);
    private static Color LOW_HP_COLOR = new Color(0.8f, 0f, 0f);

    public void Init(GameObject sprite, BattleParticipant battleParticipant) {
        this.target = sprite;
        this.battleParticipant = battleParticipant;

        this.statusUI.Init(battleParticipant);
    }

    // Start is called before the first frame update
    void Start()
    {
        this.mainCamera = Camera.main;
        this.nameText.text = this.battleParticipant.GetDisplayName();
    }

    // Update is called once per frame
    void Update()
    {
        if (!battleParticipant.IsAlive()) {
            this.gameObject.SetActive(false);
        }

        Vector3 targetPos = this.mainCamera.WorldToScreenPoint(target.transform.position);
        transform.position = targetPos;

        int hp = this.battleParticipant.GetHP();
        int maxHP = this.battleParticipant.GetMaxHP();

        if (this.renderedHP != hp || this.renderedMaxHP != maxHP) {
            this.renderedHP = hp;
            this.renderedMaxHP = maxHP;

            float percentage = ((float) hp) / maxHP;
            this.healthBarFgImage.fillAmount = percentage;
            if (percentage >= 0.66) {
                this.healthBarFgImage.color = HIGH_HP_COLOR;
            } else if (percentage >= 0.33) {
                this.healthBarFgImage.color = MED_HP_COLOR;
            } else {
                this.healthBarFgImage.color = LOW_HP_COLOR;
            }
            this.hpText.text = "" + hp + " / " + maxHP;
        }

        int block = this.battleParticipant.GetBlock();
        if (this.renderedBlock != block) {
            this.renderedBlock = block;
            if (block == 0) {
                this.blockGroup.SetActive(false);
            } else {
                this.blockGroup.SetActive(true);
                this.blockText.text = "" + block;
            }
        }
    }
}