package com.qianwen.core.websocket.handler;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.json.JsonReadFeature;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.qianwen.core.websocket.custom.DefaultTypeSessionFilter;
import com.qianwen.core.websocket.custom.SubscriptionSessionFilter;
import com.qianwen.core.websocket.holder.JsonMessageFilterHolder;
import com.qianwen.core.websocket.holder.JsonMessageHandlerHolder;
import com.qianwen.core.websocket.message.JsonWebSocketMessage;
import org.springframework.web.socket.TextMessage;
import org.springframework.web.socket.WebSocketSession;
import org.springframework.web.socket.handler.TextWebSocketHandler;

public class CustomWebSocketHandler extends TextWebSocketHandler {
    private static final Logger log = LoggerFactory.getLogger(CustomWebSocketHandler.class);
    private static final ObjectMapper MAPPER = new ObjectMapper();
    private PlanTextMessageHandler planTextMessageHandler;

    static {
        MAPPER.enable(new JsonParser.Feature[]{JsonReadFeature.ALLOW_UNESCAPED_CONTROL_CHARS.mappedFeature()});
    }

    public CustomWebSocketHandler() {
    }

    public CustomWebSocketHandler(PlanTextMessageHandler planTextMessageHandler) {
        this.planTextMessageHandler = planTextMessageHandler;
    }

    @Override
    public void handleTextMessage(WebSocketSession session, TextMessage message) throws JsonProcessingException {
        if (message.getPayloadLength() == 0) {
            return;
        }
        String payload = (String) message.getPayload();
        JsonNode jsonNode = MAPPER.readTree(payload);
        JsonNode typeNode = jsonNode.get(JsonWebSocketMessage.TYPE_FIELD);
        if (typeNode == null) {
            if (this.planTextMessageHandler != null) {
                this.planTextMessageHandler.handle(session, payload);
                return;
            } else {
                log.error("[handleTextMessage] 普通文本消息（{}）没有对应的消息处理器", payload);
                return;
            }
        }
        String messageType = typeNode.asText();
        JsonMessageHandler jsonMessageHandler = JsonMessageHandlerHolder.getHandler(messageType);
        if (jsonMessageHandler == null) {
            log.error("[handleTextMessage] 消息类型（{}）不存在对应的消息处理器", messageType);
            return;
        }
        Class<? extends JsonWebSocketMessage> messageClass = jsonMessageHandler.getMessageClass();
        JsonWebSocketMessage websocketMessageJson = (JsonWebSocketMessage) MAPPER.treeToValue(jsonNode, messageClass);
        jsonMessageHandler.handle(session, websocketMessageJson);
        SubscriptionSessionFilter filter = JsonMessageFilterHolder.getFilter(messageType);
        if (filter == null) {
            filter = new DefaultTypeSessionFilter(messageType);
            JsonMessageFilterHolder.addFilter(filter);
        }
        filter.onMessage(session, websocketMessageJson);
    }
}