using UnityEngine;

namespace AfterHours.Shop
{
    /// <summary>
    /// Rein kosmetisches, nicht genetzwertes Flug-Visual für ein Stück Ware,
    /// das vom Karton ins Regal wandert. Jeder Peer erzeugt seine eigene
    /// Instanz (ausgelöst über PlayerCarry.PlayFlightRpc) – keine
    /// Server-Autorität nötig, der eigentliche Bestand ist längst per
    /// NetworkVariable synchron.
    /// </summary>
    public sealed class FlyingPackage : MonoBehaviour
    {
        private const float ArcHeight = 0.35f;

        private Vector3 _start;
        private Vector3 _end;
        private Quaternion _startRotation;
        private Quaternion _endRotation;
        private float _duration;
        private float _elapsed;

        public static void Spawn(GameObject prefab, Vector3 start, Vector3 end, Quaternion endRotation, float duration)
        {
            if (prefab == null) return;

            var instance = Instantiate(prefab, start, Quaternion.identity);
            var flight = instance.AddComponent<FlyingPackage>();
            flight.Init(start, end, endRotation, duration);
        }

        private void Init(Vector3 start, Vector3 end, Quaternion endRotation, float duration)
        {
            _start = start;
            _end = end;
            _startRotation = transform.rotation;
            _endRotation = endRotation;
            _duration = Mathf.Max(0.05f, duration);
        }

        private void Update()
        {
            _elapsed += Time.deltaTime;
            float t = Mathf.Clamp01(_elapsed / _duration);

            Vector3 flat = Vector3.Lerp(_start, _end, t);
            float arc = ArcHeight * Mathf.Sin(t * Mathf.PI);
            transform.position = flat + Vector3.up * arc;
            transform.rotation = Quaternion.Slerp(_startRotation, _endRotation, t);

            if (t >= 1f) Destroy(gameObject);
        }
    }
}