content: package emu.grasscutter.server.packet.recv;
  
  import emu.grasscutter.net.packet.Opcodes;
  import emu.grasscutter.net.packet.PacketHandler;
  import emu.grasscutter.net.packet.PacketOpcodes;
  import emu.grasscutter.net.proto.SetPlayerBirthdayReqOuterClass.SetPlayerBirthdayReq;
  import emu.grasscutter.net.proto.SocialDetailOuterClass.SocialDetail;
  import emu.grasscutter.server.game.GameSession;
  import emu.grasscutter.server.packet.send.PacketGetPlayerSocialDetailRsp;
  import emu.grasscutter.server.packet.send.PacketSetPlayerBirthdayRsp;
  
  @Opcodes(PacketOpcodes.SetPlayerBirthdayReq)
  public class HandlerSetPlayerBirthdayReq extends PacketHandler {
  	@Override
  	public void handle(GameSession session, byte[] header, byte[] payload) throws Exception {
  		SetPlayerBirthdayReq req = SetPlayerBirthdayReq.parseFrom(payload);
  
  		// RET_BIRTHDAY_CANNOT_BE_SET_TWICE = 7009
  		if (session.getPlayer().hasBirthday()) {
  			session.send(new PacketSetPlayerBirthdayRsp(7009));
  			return;
  		}
  
  		int month = req.getBirthday().getMonth();
  		int day = req.getBirthday().getDay();
  
  		// RET_BIRTHDAY_FORMAT_ERROR = 7022
  		if (!isValidBirthday(month, day)) {
  			session.send(new PacketSetPlayerBirthdayRsp(7022));
  			return;
  		}
  
  		// Update birthday value
  		session.getPlayer().setBirthday(day, month);
  
  		// Save birthday month and day
  		session.getPlayer().save();
  		SocialDetail.Builder detail = session.getPlayer().getSocialDetail();
  
  		session.send(new PacketSetPlayerBirthdayRsp(session.getPlayer()));
  		session.send(new PacketGetPlayerSocialDetailRsp(detail));
  	}
  
  	private boolean isValidBirthday(int month, int day) {
  
  		switch (month) {
  			case 1:
  			case 3:
  			case 5:
  			case 7:
  			case 8:
  			case 10:
  			case 12:
  				return day > 0 & day <= 31;
  			case 4:
  			case 6:
  			case 9:
  			case 11:
  				return day > 0 && day <= 30;
  			case 2:
  				return day > 0 & day <= 29;
  		}
  
  		return false;
  	}
  
  }
  