using Unity.Burst;
using Unity.Collections;
using Unity.Entities;
using Unity.NetCode;
using EE2Clone.Components;
using EE2Clone.Core;

namespace EE2Clone.NetCode
{
    /// <summary>
    /// Server-side system: processes GoInGameRequest RPCs, marks connections as in-game,
    /// and creates a PlayerState entity for each connecting player.
    /// </summary>
    [BurstCompile]
    [WorldSystemFilter(WorldSystemFilterFlags.ServerSimulation)]
    public partial struct GoInGameServerSystem : ISystem
    {
        private int _nextPlayerId;

        [BurstCompile]
        public void OnCreate(ref SystemState state)
        {
            state.RequireForUpdate<GoInGameRequest>();
            _nextPlayerId = 1;
        }

        [BurstCompile]
        public void OnUpdate(ref SystemState state)
        {
            var ecb = new EntityCommandBuffer(Allocator.Temp);

            foreach (var (request, requestSource, requestEntity) in
                     SystemAPI.Query<RefRO<GoInGameRequest>, RefRO<ReceiveRpcCommandRequest>>()
                         .WithEntityAccess())
            {
                var connectionEntity = requestSource.ValueRO.SourceConnection;

                // Mark the connection as in-game
                ecb.AddComponent<NetworkStreamInGame>(connectionEntity);

                // Get the NetworkId for this connection
                var networkId = state.EntityManager.GetComponentData<NetworkId>(connectionEntity);

                // Create a PlayerState entity for this player
                var playerEntity = ecb.CreateEntity();
                ecb.AddComponent(playerEntity, new PlayerStateComponent
                {
                    PlayerId = _nextPlayerId,
                    CurrentEpoch = Epoch.StoneAge,
                    PopulationCurrent = 0,
                    PopulationMax = GameConstants.StartingPopulationCap,
                    CivilizationId = 0,
                    IsAlive = true
                });
                ecb.AddComponent(playerEntity, new PlayerResourcesComponent
                {
                    Food = 200,
                    Wood = 200,
                    Stone = 100,
                    Gold = 100,
                    Tin = 0
                });
                ecb.AddComponent(playerEntity, new GhostOwner { NetworkId = networkId.Value });

                UnityEngine.Debug.Log($"[Server] Player {_nextPlayerId} (NetworkId={networkId.Value}) entered game");

                _nextPlayerId++;

                // Destroy the request entity
                ecb.DestroyEntity(requestEntity);
            }

            ecb.Playback(state.EntityManager);
            ecb.Dispose();
        }
    }
}