using System.Collections.Generic;
using ProjectM.Simulation;
using Unity.Entities;
using Unity.NetCode;
using UnityEngine;

namespace ProjectM.Client
{
    /// <summary>
    /// Client-side meta-purchase sender: a static enqueue (the Step-14 base meta-shop panel / execute_code) drained
    /// into <see cref="MetaSpendRequest"/> RPCs. Carries only the upgrade ID — the tier is server-computed and the
    /// server re-validates everything (Staging gate, class mask, MaxTier, prereq, Aether affordability), so a stale
    /// or forged request is simply dropped. A real QUEUE (unlike the single-slot boon pick) — two rapid clicks on
    /// two different shop rows must both arrive. Statics reset on play-enter (the stale-bridge hazard).
    /// </summary>
    [WorldSystemFilter(WorldSystemFilterFlags.ClientSimulation)]
    public partial class MetaSpendSendSystem : SystemBase
    {
        static readonly Queue<byte> s_Queue = new();

        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
        static void ResetStatics() => s_Queue.Clear();

        /// <summary>Queue a permanent-upgrade purchase by catalog id. The shop row click + execute_code drive this.</summary>
        public static void RequestPurchase(byte upgradeId) => s_Queue.Enqueue(upgradeId);

        protected override void OnCreate()
        {
            RequireForUpdate<NetworkId>();
        }

        protected override void OnUpdate()
        {
            while (s_Queue.Count > 0)
            {
                var req = EntityManager.CreateEntity(typeof(MetaSpendRequest), typeof(SendRpcCommandRequest));
                EntityManager.SetComponentData(req, new MetaSpendRequest { UpgradeId = s_Queue.Dequeue() });
            }
        }
    }
}