using UnityEngine;

namespace InterfaceOff.WorldScene
{
    public class PortalManager : MonoBehaviour
    {
        [Header("References")]
        [SerializeField] GameObject m_OtherPortal;
        [SerializeField] Camera m_PlayerCamera;

        [Header("Set References")]
        [SerializeField] GameObject m_CameraPrefab;
        [SerializeField] MeshRenderer[] m_Renderers;
        [SerializeField] Transform m_PlayerPoint;

        // Private variables //

        PortalManager m_OtherManager;
        [SerializeField] PortalCamera m_PortalCamera;

        // Gets the other end of the portal
        public PortalManager Linked() => m_OtherManager;

        // Gets the location of the player relative to the portal
        public Vector3 PlayerOffset() => m_PlayerPoint.localPosition;

        // Start is called before the first frame update
        void Start()
        {
            // Validates that it is a portal
            m_OtherManager = m_OtherPortal.GetComponentInChildren<PortalManager>();
            if (m_OtherManager == null)
            {
                Debug.LogError("OtherPortal was not valid portal");
                return;
            }

            // Creates the camera in top-level heirachry and stores the PortalCamera script
            GameObject cam = Instantiate(m_CameraPrefab, transform.root.parent);
            m_PortalCamera = cam.GetComponentInChildren<PortalCamera>();

            // Initialises the camera so it renders to the portal and not the screen
            m_PortalCamera.InitCamera(m_Renderers, this, transform.parent.localEulerAngles * 2.0f);
        }

        void LateUpdate() => m_PlayerPoint.position = m_PlayerCamera.transform.position;

        // When something enters the portal
        private void OnTriggerEnter(Collider other)
        {
            // Changing the state if it is not the player will cause issues
            if (!other.CompareTag("Player"))
            {
                return;
            }

            // Calculates if the player is going towards the portal
            Vector3 difference = m_PlayerCamera.transform.position - transform.position;
            PlayerController.SetPos(m_OtherManager.transform.position + difference - new Vector3(0, 1.0f, 0));
        }
    }
}