package cn.org.hentai.jtt1078.websocket;

import cn.org.hentai.jtt1078.entity.enums.ProtocolVersion;
import cn.org.hentai.jtt1078.server.audio.Jt1078AudioSenderService;
import org.springframework.stereotype.Component;
import org.springframework.web.socket.BinaryMessage;
import org.springframework.web.socket.CloseStatus;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.AbstractWebSocketHandler;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;

@Component
public class MyWebSocketHandler extends AbstractWebSocketHandler {

    private static final Map<String, List<WebSocketSession>> simSessionMap = new ConcurrentHashMap<>();

    @Override
    protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception {
        System.out.println("Received text: " + message.getPayload());
        session.sendMessage(new TextMessage("Echo: " + message.getPayload()));
    }

    @Override
    protected void handleBinaryMessage(WebSocketSession session, BinaryMessage message) {
        String sim = (String) session.getAttributes().get("sim");
        ByteBuffer payload = message.getPayload();
        // System.out.println("Received binary message, size: " + payload.remaining());
        ProtocolVersion protocolVersion = getProtocolVersion(sim);
        // 这里处理二进制数据
        Jt1078AudioSenderService.sendAudio(sim, 1, payload.array(), protocolVersion);
    }

    //根据sim卡长度判断协议版本
    private ProtocolVersion getProtocolVersion(String sim) {

        ProtocolVersion version;
        if (sim != null && sim.length() == 20) { // 10字节BCD编码 → 20位字符串
            version = ProtocolVersion.V2019;
        } else if (sim != null && sim.length() == 12) { // 6字节BCD编码 → 12位字符串
            version = ProtocolVersion.V2013;
        } else {
            version = ProtocolVersion.UNKNOWN; // 无法判断
            System.err.println("Invalid SIM length, unable to determine JT1078 version");
        }
        return version;
    }

    @Override
    public void afterConnectionEstablished(WebSocketSession session) throws Exception {
        System.out.println("Connected: " + session.getId());
        String sim = (String) session.getAttributes().get("sim");
        simSessionMap.computeIfAbsent(sim, k -> new CopyOnWriteArrayList<>()).add(session);
        System.out.println("绑定SIM: " + sim + " -> " + session.getId());
    }

    @Override
    public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception {
        System.out.println("Disconnected: " + session.getId());
        simSessionMap.values().forEach(list -> list.remove(session));
    }

    // 给对应 SIM 的所有连接广播音频数据（G.711A原始帧）
    public static void sendAudioToSim(String sim, byte[] audioData) {
        List<WebSocketSession> sessions = simSessionMap.get(sim);
        if (sessions != null) {
            for (WebSocketSession s : sessions) {
                if (s.isOpen()) {
                    try {
                        s.sendMessage(new BinaryMessage(audioData));
                    } catch (IOException e) {
                        System.out.println("发送音频数据失败: " + e.getMessage());
                    }
                }
            }
        }
    }
}