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

public class JustMove : MonoBehaviour {
  public List<Vector2> points = new List<Vector2>();

  [Range(0.0001f, 4.0000f)]
  public float speedPerSecond = 0.3f;

  public bool startAtPoint0 = true;
  public bool autostart = false;
  public bool loop = true;
  private bool running = false;

  private Rigidbody2D rb;

  public void Begin() {
    running = true;
  }
  void Start() {
    rb = GetComponent<Rigidbody2D>();
    if(startAtPoint0) {
      transform.position = new Vector3(points[0].x, points[0].y, transform.position.z);
    }
    if(autostart) {
      Begin();
    }
  }
  void FixedUpdate() {
    if(running && points.Count > 0) {
      Vector2 p = points[0];
      if(Vector2.Distance(p,new Vector2(transform.position.x, transform.position.y)) < speedPerSecond * Time.fixedDeltaTime) {
        points.RemoveAt(0);
        if(loop) {
          points.Add(p);
        }
        p = points[0];
      }
      Vector2 targetDirection = (p - new Vector2(transform.position.x, transform.position.y)).normalized;
      rb.velocity = targetDirection * speedPerSecond;
    }
  }
  void OnDrawGizmos() {
    Gizmos.color = Color.yellow;
    Gizmos.DrawLine(transform.position, points[0]);
    for(int i = 1;i < points.Count;i++) {
      Gizmos.DrawLine(points[i-1], points[i]);
    }
    Gizmos.DrawLine(points[points.Count - 1], points[0]);
  }
}