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

public class PGem : MonoBehaviour
{
    [SerializeField]
    private float m_maxSpeed;

    [SerializeField]
    private float m_pickRadius;

    [SerializeField]
    private int m_gemCount;

    private bool m_flying;

    private Vector2 m_refVel;

    public float GemSpawnLifeTime;

    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        PHomePlayer playerUnit = PHomeGameMode.main.PlayerUnit;
        if (!m_flying)
        {
            if (playerUnit.HasPickMagnet)
            {
                m_flying = true;
            }
            else
            {
                Vector2 playerPos = playerUnit.transform.position;
                Vector2 gemPos = transform.position;
                if (Vector2.Distance(playerPos, gemPos) < playerUnit.PickRadius)
                {
                    m_flying = true;
                }
            }
        }

        // Fly to player
        if (m_flying && playerUnit != null)
        {
            Vector3 oldPos = transform.position;

            Vector2 curPos = transform.position;
            Vector2 targetPos = playerUnit.transform.position;

            Vector2 offset = targetPos - curPos;
            if (offset.magnitude < m_pickRadius)
            {
                PickGem(playerUnit);
                return;
            }

            Vector2 newPos = Vector2.SmoothDamp(curPos, targetPos, ref m_refVel, 0.2f);
            oldPos.x = newPos.x;
            oldPos.y = newPos.y;
            transform.position = oldPos;
        }
    }

    private void PickGem(PHomePlayer playerUnit)
    {
        PHomeGameMode.main.AddGem(playerUnit, m_gemCount);
        AudioManager.instance.PlaySingleSound(AudioManager.instance.GemCollect);
        Destroy(gameObject);
    }
}