using Unity.Cinemachine;
using UnityEngine;

namespace NightclubArcadia.Cinematics
{
    /// <summary>
    /// Proxy transform the follow camera tracks. Combines player follow,
    /// POI bias, manual pan offset, and distance bias.
    /// </summary>
    public sealed class CameraRigAnchor : MonoBehaviour
    {
        [SerializeField] Transform followTarget;
        [SerializeField] CinemachinePositionComposer composer;
        [SerializeField] float followSmoothTime = 0.12f;
        [SerializeField] float distanceSmoothTime = 0.8f;

        float defaultCameraDistance = 10f;
        float distanceVelocity;
        Vector3 followVelocity;

        public Vector3 PoiBias { get; set; }
        public Vector3 ManualPanOffset { get; set; }
        public float DistanceBias { get; set; }

        public Transform FollowTarget => followTarget;

        void Start()
        {
            if (composer == null)
            {
                composer = FindFirstObjectByType<CinemachinePositionComposer>();
            }

            if (composer != null)
            {
                defaultCameraDistance = composer.CameraDistance;
            }
        }

        void LateUpdate()
        {
            if (followTarget == null)
            {
                return;
            }

            var targetPosition = followTarget.position + PoiBias + ManualPanOffset;
            transform.position = Vector3.SmoothDamp(
                transform.position,
                targetPosition,
                ref followVelocity,
                followSmoothTime);

            if (composer != null)
            {
                var targetDistance = defaultCameraDistance + DistanceBias;
                composer.CameraDistance = Mathf.SmoothDamp(
                    composer.CameraDistance,
                    targetDistance,
                    ref distanceVelocity,
                    distanceSmoothTime);
            }
        }

        public void Nudge(Vector3 worldDelta)
        {
            ManualPanOffset += worldDelta;
        }

        public void ClampManualPan(float maxDistance)
        {
            if (followTarget == null)
            {
                return;
            }

            var offset = ManualPanOffset;
            offset.y = 0f;
            if (offset.magnitude > maxDistance)
            {
                ManualPanOffset = offset.normalized * maxDistance;
            }
        }
    }
}