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

public class CameraFollow : MonoBehaviour
{
    [SerializeField] private GameEventListener_RiftPlayer onPlayerSpawned;
    [Space]
    public bool SpectatorMode = false;
    public bool SmoothMovement = false;
    [SerializeField] private Vector3 offset;
    [SerializeField] private Vector3 rotationEuler;
    [SerializeField] private bool HasCutsceneAnimation;

    public List<GameObject> players = new List<GameObject>();

    private float zDistance;
    private GameObject firstInRace;

    private Vector3 startingPos;
    private Quaternion startingRot;

    private bool isReady = false;

    Animator anim;

    // Shake variables
    private float shakeDuration = 0f;
    private float shakeMagnitude = 0.05f;
    private float shakeDamping = 1f;
    private Vector3 shakeOffset = Vector3.zero;

    private void Awake()
    {
        startingPos = this.transform.position;
        startingRot = this.transform.rotation;
        onPlayerSpawned.Response.AddListener(OnPlayerSpawned);

        if (HasCutsceneAnimation)
            anim = GetComponent<Animator>();
    }

    void Update()
    {
        if (!isReady) return;

        if (SpectatorMode)
        {
            zDistance = 0f;
            for (int i = players.Count - 1; i >= 0; i--)
            {
                if (players[i] == null)
                {
                    players.RemoveAt(i);
                    continue;
                }

                if (players[i].transform.position.z - this.transform.position.z > zDistance)
                {
                    zDistance = players[i].transform.position.z - this.transform.position.z;
                    firstInRace = players[i];
                }
            }
        }

        if (firstInRace == null) return;

        // Screen shake logic
        if (shakeDuration > 0f)
        {
            shakeOffset = Random.insideUnitSphere * shakeMagnitude;
            shakeDuration -= Time.deltaTime * shakeDamping;
        }
        else
        {
            shakeOffset = Vector3.zero;
            shakeDuration = 0f;
        }

        Vector3 targetPosition = firstInRace.transform.position + offset + shakeOffset;

        if (SmoothMovement)
            this.transform.position = Vector3.Lerp(this.transform.position, targetPosition, Time.deltaTime);
        else
            this.transform.position = targetPosition;

        this.transform.rotation = Quaternion.Euler(rotationEuler);
    }

    public void OnPlayerSpawned(RiftPlayer photonView)
    {
        players.Add(photonView.gameObject);

        if (SpectatorMode) return;

        firstInRace = photonView.gameObject;

        if (!HasCutsceneAnimation)
            isReady = true;
    }

    public void OnCameraAnimationEnded()
    {
        anim.enabled = false;
        isReady = true;
    }

    /// <summary>
    /// Call this to trigger a subtle screen shake.
    /// </summary>
    public void Shake(float duration = 0.2f, float magnitude = 0.05f)
    {
        shakeDuration = duration;
        shakeMagnitude = magnitude;
    }
}