using System.Collections.Generic;
using AfterHours.Core;
using AfterHours.Data;
using AfterHours.Shop;
using Unity.Netcode;
using UnityEngine;

namespace AfterHours.Economy
{
    /// <summary>
    /// Bestellungen beim Großhandel: Ware wird sofort bezahlt, trifft aber
    /// erst nach einer Lieferzeit in der passenden Lagerkiste ein. Nur Server.
    /// </summary>
    public sealed class SupplierService : NetworkBehaviour
    {
        public static SupplierService Instance { get; private set; }

        [SerializeField] private ProductCatalog _catalog;
        [SerializeField] private float _deliveryLeadHours = 4f;

        private readonly List<PurchaseOrder> _pending = new();

        private void Awake() => Instance = this;

        public override void OnNetworkDespawn()
        {
            if (Instance == this) Instance = null;
        }

        private void Update()
        {
            if (!IsServer || GameClock.Instance == null) return;

            float now = GameClock.Instance.TotalHours;
            for (int i = _pending.Count - 1; i >= 0; i--)
            {
                if (now < _pending[i].DeliveryTime) continue;

                Deliver(_pending[i]);
                _pending.RemoveAt(i);
            }
        }

        /// <summary>Server: Bestellung aufgeben. False, wenn Produkt unbekannt oder Geld nicht reicht.</summary>
        public bool PlaceOrder(int productId, int quantity)
        {
            if (!IsServer || quantity <= 0) return false;
            if (!_catalog.TryGet(productId, out var product)) return false;

            float cost = product.WholesalePrice * quantity;
            if (!ShopEconomy.Instance.TrySpend(cost)) return false;

            var order = new PurchaseOrder { DeliveryTime = GameClock.Instance.TotalHours + _deliveryLeadHours };
            order.Add(productId, quantity, product.WholesalePrice);
            _pending.Add(order);
            return true;
        }

        private void Deliver(PurchaseOrder order)
        {
            order.Delivered = true;

            foreach (var line in order.Lines)
            {
                var crate = StorageCrateRegistry.Instance.FindFor(line.ProductId);
                if (crate == null)
                {
                    Debug.LogWarning($"[SupplierService] Keine Lagerkiste für ProductId {line.ProductId} — Lieferung verworfen.");
                    continue;
                }
                crate.Restock(line.Quantity);
            }
        }
    }
}