using System.Collections;
using UnityEngine;
using Random = UnityEngine.Random;

namespace InterfaceOff.WorldScene
{
    public class EnemyController : MonoBehaviour
    {
        [SerializeField] private PlayerController Player;
        [SerializeField] private int DeathIndex = 500;
        [SerializeField] private Rigidbody Body;
        [SerializeField] private GameObject RendererObject;
        [SerializeField] private GameObject ExplosionPrefab;
        [SerializeField] private LineRenderer BulletTracer;
        [SerializeField] private GameObject GunStart;
        [SerializeField] private GameObject Head;

        private Quaternion StartRotation;
        private Vector3 StartPosition;

        private bool StartedShooting;
        private bool WasAliveLastFrame;
        private bool Alive = true;

        private void Start()
        {
            StartPosition = transform.position;
            StartRotation = transform.rotation;

            Body.Sleep();
        }

        private void Update()
        {
            /* Updates the death state */
            WasAliveLastFrame = Alive;
            Alive = DeathIndex >= Player.FrameIndex;
            
            /* Checks if it is about to die or kill */
            if (DeathIndex == (Player.FrameIndex + 10) && !StartedShooting)
            {
                StartCoroutine(routine: ShootyShooty());
                StartedShooting = true;
            }

            /* Checks if it just died */
            if (!Alive && WasAliveLastFrame)
            {
                Body.WakeUp();
                Body.AddForce(Random.insideUnitSphere * 250);

                StartCoroutine(routine: Suicide());
            }

            if (Alive)
            {
                transform.position = StartPosition;
                transform.rotation = StartRotation;
                Body.velocity = Vector3.zero;
                
                RendererObject.SetActive(true);
                Body.Sleep();
            }
            
            /* Check for resurrection */
            if (Alive && !WasAliveLastFrame)
            {
                StartedShooting = false;
            }
        }

        private IEnumerator ShootyShooty()
        {
            BulletTracer.enabled = true;
            
            for (int i = 0; i < 10; i++)
            {
                BulletTracer.SetPosition(0, Head.transform.position);
                BulletTracer.SetPosition(1, Player.transform.position);
                BulletTracer.SetPosition(2, GunStart.transform.position);
                
                yield return new WaitForFixedUpdate();
            }

            BulletTracer.enabled = false;
        }

        private IEnumerator Suicide()
        {
            yield return new WaitForSeconds(1f);
            RendererObject.SetActive(false);
            
            GameObject explosionGoBoomBoom = Instantiate(ExplosionPrefab, transform);
            yield return new WaitForSeconds(1f);
            Destroy(explosionGoBoomBoom);
        }
    }
}