using AfterHours.Data;
using AfterHours.Interaction;
using AfterHours.Networking;
using Unity.Netcode;
using UnityEngine;

namespace AfterHours.Shop
{
    /// <summary>
    /// Lagerkiste im Backroom: hält Nachschub einer einzigen Produktsorte.
    /// Spieler nehmen daraus in die Hände auf und tragen die Ware zum Regal
    /// (siehe ShelfSlot.Interact).
    /// </summary>
    public sealed class StorageCrate : NetworkBehaviour, IInteractable
    {
        [SerializeField] private ProductCatalog _catalog;
        [SerializeField] private int _productId = -1;
        [SerializeField] private int _startingQuantity = 200;

        private readonly NetworkVariable<int> _quantity = new(0);

        public int ProductId => _productId;
        public int Quantity => _quantity.Value;
        public bool IsEmpty => _quantity.Value <= 0;

        public override void OnNetworkSpawn()
        {
            if (!IsServer) return;

            _quantity.Value = _startingQuantity;
            StorageCrateRegistry.Instance.Register(this);
        }

        public override void OnNetworkDespawn()
        {
            if (IsServer) StorageCrateRegistry.Instance.Unregister(this);
        }

        public string GetPrompt(ulong clientId)
        {
            var product = _catalog.Get(_productId);
            string name = product != null ? product.DisplayName : "?";
            return IsEmpty ? $"{name} — Lager leer" : $"{name} nehmen — {_quantity.Value} im Lager";
        }

        /// <summary>Server: Spieler nimmt Ware in die Hände auf.</summary>
        public void Interact(NetworkObject actor)
        {
            if (!IsServer || IsEmpty) return;
            if (!actor.TryGetComponent<PlayerHands>(out var hands)) return;

            int want = Mathf.Min(_quantity.Value, PlayerHands.MaxCarry);
            int taken = hands.TryTake(_productId, want);
            _quantity.Value -= taken;
        }

        /// <summary>Server: Lieferung trifft ein.</summary>
        public void Restock(int quantity)
        {
            if (!IsServer || quantity <= 0) return;
            _quantity.Value += quantity;
        }
    }
}