package com.backendsys.modules.sse.controller;

import cn.hutool.core.convert.Convert;
import com.backendsys.modules.common.config.security.utils.HttpRequestUtil;
import com.backendsys.modules.common.config.security.utils.SecurityUtil;
import com.backendsys.modules.sse.emitter.SseEmitterManager;
import com.backendsys.modules.sse.entity.SseResponse;
import com.backendsys.modules.sse.entity.SseResponseEnum;
import com.backendsys.modules.sse.utils.SseEmitterUTF8;
import com.backendsys.modules.sse.utils.SseUtil;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;

import java.io.IOException;

@RestController
public class SseController {

    @Value("${spring.application.name}")
    private String APPLICATION_NAME;

    @Autowired
    private SseUtil sseUtil;
    @Autowired
    private HttpRequestUtil httpRequestUtil;

    /**
     * [SSE] 消息监听 (拼接键值: 应用名称-用户ID)
     */
    @GetMapping(value = "/api/sse/listenStream", produces = "text/event-stream;charset=UTF-8")
    public SseEmitter stream(HttpServletResponse response) {

        // 获得 浏览器窗口UUID
        String browserWindowUUID = httpRequestUtil.getBrowserWindowUUID();

        // 拼接键值: 应用名称-用户ID-浏览器窗口UUID
        String emitterKey = APPLICATION_NAME + "-userid-" + Convert.toStr(SecurityUtil.getUserId() + "-" + browserWindowUUID);

        // 如果存在，则关闭
        sseUtil.closeIfExist(emitterKey);

//        System.out.println("browserWindowUUID = " + browserWindowUUID);
//        System.out.println("emitterKey = " + emitterKey);

        SseEmitterUTF8 emitter = new SseEmitterUTF8(Long.MAX_VALUE);
        SseEmitterManager manager = SseEmitterManager.getInstance();
        manager.addEmitter(emitterKey, emitter);
        try {
            // 设置响应头，指定字符编码
            response.setCharacterEncoding("UTF-8");
            response.setContentType("text/event-stream");
            // CONNECT: 建立连接
            String dataStr = (new SseResponse(SseResponseEnum.CONNECT)).toJsonStr();
            emitter.send(SseEmitter.event().data(dataStr));

        } catch (IOException e) {
            // 关闭连接
            System.out.println("(listenStream):" + e.getMessage());
        } finally {
            manager.removeEmitter(emitter);
        }
        return emitter;
    }

    /**
     * [SSE] 测试发送 (单个)
     */
    @GetMapping("/api/sse/sendHello")
    public String sendHelloWorld() {
        String dataStr = (new SseResponse("Hello World")).toJsonStr();
        sseUtil.send(SecurityUtil.getUserId(), dataStr);
        return "success";
    }

    /**
     * [SSE] 测试发送 (全部)
     */
    @GetMapping("/api/sse/sendHelloToAll")
    public String sendHelloWorldToAll() {
        String dataStr = (new SseResponse("Hello World Everyone")).toJsonStr();
        sseUtil.sendToAll(dataStr);
        return "success";
    }

}