/*
 * Copyright 2023-2024 Eduard Kargin <kargin.eduard@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


using Ragon.Protocol;
using Ragon.Server.Entity;
using Ragon.Server.IO;
using Ragon.Server.Lobby;
using Ragon.Server.Logging;
using Ragon.Server.Room;

namespace Ragon.Server.Handler
{
  public sealed class SceneLoadedOperation : BaseOperation
  {
    private readonly IRagonLogger _logger = LoggerManager.GetLogger(nameof(SceneLoadedOperation));

    public SceneLoadedOperation(RagonBuffer reader, RagonBuffer writer) : base(reader, writer)
    {
    }

    public override void Handle(RagonContext context, NetworkChannel channel)
    {
      if (context.ConnectionStatus == ConnectionStatus.Unauthorized)
        return;

      var owner = context.Room.Owner;
      var player = context.RoomPlayer;
      var room = context.Room;
      if (player.IsLoaded)
      {
        _logger.Warning($"Player {player.Name}:{player.Connection.Id} already ready");
        return;
      }

      if (player == owner)
      {
        var statics = Reader.ReadUShort();
        for (var staticIndex = 0; staticIndex < statics; staticIndex++)
        {
          var entityType = Reader.ReadUShort();
          var eventAuthority = (RagonAuthority)Reader.ReadByte();
          var staticId = Reader.ReadUShort();
          var propertiesCount = Reader.ReadUShort();

          var entityParameters = new RagonEntityParameters()
          {
            Type = entityType,
            Authority = eventAuthority,
            AttachId = 0,
            StaticId = staticId,
            BufferedEvents = context.LimitBufferedEvents,
          };

          var entity = new RagonEntity(entityParameters);
          for (var propertyIndex = 0; propertyIndex < propertiesCount; propertyIndex++)
          {
            var propertyType = Reader.ReadBool();
            var propertySize = Reader.ReadUShort();
            entity.AddProperty(new RagonProperty(propertySize, propertyType));
          }

          var roomPlugin = room.Plugin;
          if (!roomPlugin.OnEntityCreate(player, entity)) continue;

          var playerInfo = $"Player {context.Connection.Id}|{context.LobbyPlayer.Name}";
          var entityInfo = $"{entity.Id}:{entity.Type}";

          _logger.Trace($"{playerInfo} created static entity {entityInfo}");

          entity.Attach(player);
          room.AttachEntity(entity);
          player.AttachEntity(entity);
        }

        _logger.Trace($"Player {context.Connection.Id}|{context.LobbyPlayer.Name} loaded");

        room.WaitPlayersList.Add(player);

        foreach (var roomPlayer in room.WaitPlayersList)
        {
          DispatchPlayerJoinExcludePlayer(room, roomPlayer, Writer);

          roomPlayer.SetReady();
        }

        room.UpdateReadyPlayerList();

        DispatchSnapshot(room, room.WaitPlayersList, Writer);

        room.WaitPlayersList.Clear();
      }
      else if (owner.IsLoaded)
      {
        player.SetReady();

        DispatchPlayerJoinExcludePlayer(room, player, Writer);

        room.UpdateReadyPlayerList();

        DispatchSnapshot(room, new List<RagonRoomPlayer>() { player }, Writer);

        foreach (var entity in room.EntityList)
          entity.RestoreBufferedEvents(player, Writer);
      }
      else
      {
        _logger.Trace($"Player {player.Connection.Id}|{context.LobbyPlayer.Name} waiting owner of room");
        room.WaitPlayersList.Add(player);
      }
    }

    private void DispatchPlayerJoinExcludePlayer(RagonRoom room, RagonRoomPlayer roomPlayer, RagonBuffer writer)
    {
      writer.Clear();
      writer.WriteOperation(RagonOperation.PLAYER_JOINED);
      writer.WriteUShort(roomPlayer.Connection.Id);
      writer.WriteString(roomPlayer.Id);
      writer.WriteString(roomPlayer.Name);

      var sendData = writer.ToArray();
      foreach (var awaiter in room.ReadyPlayersList)
      {
        if (awaiter != roomPlayer)
          awaiter.Connection.Reliable.Send(sendData);
      }
    }

    private void DispatchSnapshot(RagonRoom room, List<RagonRoomPlayer> receviersList, RagonBuffer writer)
    {
      writer.Clear();
      writer.WriteOperation(RagonOperation.SNAPSHOT);

      var dynamicEntities = room.DynamicEntitiesList;
      var dynamicEntitiesCount = (ushort)dynamicEntities.Count;
      writer.WriteUShort(dynamicEntitiesCount);
      foreach (var entity in dynamicEntities)
        entity.Snapshot(writer);

      var staticEntities = room.StaticEntitiesList;
      var staticEntitiesCount = (ushort)staticEntities.Count;
      writer.WriteUShort(staticEntitiesCount);
      foreach (var entity in staticEntities)
        entity.Snapshot(writer);

      var sendData = writer.ToArray();
      foreach (var player in receviersList)
        player.Connection.Reliable.Send(sendData);
    }
  }
}