using ProjectM.Simulation;
using Unity.Entities;
using Unity.NetCode;
using UnityEngine;

namespace ProjectM.Client
{
    /// <summary>
    /// Client-side ready-toggle sender: a static enqueue (HUD button at Step 14 / the T dev key / execute_code)
    /// drained into <see cref="ReadyToggleRequest"/> RPC entities — the BuildSendSystem queue+drain idiom. The local
    /// bool tracks only the toggle DIRECTION; the server-replicated <see cref="PlayerReady"/> is the truth the HUD
    /// renders. Statics reset on play-enter (statics survive fast-enter-playmode reloads — the stale-bridge hazard).
    /// </summary>
    [WorldSystemFilter(WorldSystemFilterFlags.ClientSimulation)]
    public partial class ReadySendSystem : SystemBase
    {
        static int s_Pending;      // queued explicit sets
        static byte s_PendingValue;
        static bool s_LocalReady;  // last requested state (toggle direction only, not authority)

        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
        static void ResetStatics()
        {
            s_Pending = 0;
            s_PendingValue = 0;
            s_LocalReady = false;
        }

        /// <summary>Queue an explicit ready set (HUD button / execute_code).</summary>
        public static void SetReady(bool ready)
        {
            s_PendingValue = (byte)(ready ? 1 : 0);
            s_Pending++;
            s_LocalReady = ready;
        }

        /// <summary>Queue a toggle of the last requested state (the T dev key; HUD replaces this at Step 14).</summary>
        public static void ToggleReady() => SetReady(!s_LocalReady);

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

        protected override void OnUpdate()
        {
            var keyboard = UnityEngine.InputSystem.Keyboard.current;
            if (keyboard != null && keyboard.tKey.wasPressedThisFrame && !PauseMenuController.Open)
                ToggleReady();

            while (s_Pending > 0)
            {
                s_Pending--;
                var req = EntityManager.CreateEntity(typeof(ReadyToggleRequest), typeof(SendRpcCommandRequest));
                EntityManager.SetComponentData(req, new ReadyToggleRequest { Ready = s_PendingValue });
            }
        }
    }
}