using System.Collections;
using Unity.Cinemachine;
using UnityEngine;
using NightclubArcadia.Core;

namespace NightclubArcadia.Cinematics
{
    /// <summary>
    /// Points a CinemachineCamera at the player once the player exists.
    ///
    /// Level cameras — the reveal cameras in particular — used to hold a serialized
    /// reference to the PlayerArmature. The player now lives in the Systems scene, so
    /// that reference cannot be serialized any more and has to be bound at runtime.
    /// </summary>
    [RequireComponent(typeof(CinemachineCamera))]
    public sealed class CinemachineFollowsPlayer : MonoBehaviour
    {
        [Tooltip("Also drive LookAt, not just Follow.")]
        [SerializeField] bool alsoLookAt;

        [Tooltip("Seconds to keep retrying while the Systems scene finishes loading.")]
        [SerializeField] float resolveTimeout = 5f;

        IEnumerator Start()
        {
            var cam = GetComponent<CinemachineCamera>();
            var deadline = Time.unscaledTime + resolveTimeout;

            while (SceneServices.Player == null && Time.unscaledTime < deadline)
            {
                yield return null;
            }

            var player = SceneServices.Player;
            if (player == null)
            {
                Debug.LogError($"[CinemachineFollowsPlayer] {name}: no object tagged Player appeared " +
                               $"within {resolveTimeout}s.", this);
                yield break;
            }

            cam.Follow = player;
            if (alsoLookAt)
            {
                cam.LookAt = player;
            }
        }
    }
}