import React, { useState, useEffect, useRef } from "react";
import "./u1.css";
import { useNavigate } from "react-router-dom";
// import { invoke } from "@tauri-apps/api/core";
// import { listen } from "@tauri-apps/api/event";
import idcard from "../../assets/idcard.png";
import semicircle from "../../assets/semicircle.png";
import LongButton from "../../components/LongButton";
import LongButtonLoading from "../../components/LongButtonLoading";
import DecorLine from "../../components/DecorLine";
import { getPatientInfo } from "../../api/hisApi";

const U1: React.FC = () => {
  const navigate = useNavigate();

  const [reading, setReading] = useState(false);
  const [countdown, setCountdown] = useState(6);
  const [errorMsg, setErrorMsg] = useState("");
  const timerRef = useRef<number | null>(null);
  const intervalRef = useRef<number | null>(null);
  const errorTimerRef = useRef<number | null>(null);
  const isProcessingRef = useRef(false);

  // 实时监听身份证读取
  useEffect(() => {
    // localStorage.setItem("lastIdCardNo", '362331199210243023');
    // navigate("/UI6");
    // return;
    window.electronAPI.startIdCardListen().catch((e: any) => {
      console.error("start_idcard_listen failed", e);
      window.electronAPI.log("error", `start_idcard_listen failed: ${e}`);
    });

    window.electronAPI.onIdCardData((e: any) => {
      // 如果正在处理中，忽略新的数据
      if (isProcessingRef.current) return;
      isProcessingRef.current = true;
      setReading(true); // 更新 UI 为读取中状态

      const payload = e.payload;
      try {
        if (payload?.id_card_no) {
          localStorage.setItem("lastIdCardNo", payload.id_card_no);
          // 存储完整的身份证信息供后续页面使用
          localStorage.setItem("idCardData", JSON.stringify(payload));
        }
      } catch (err) {
        console.warn("localStorage.setItem failed", err);
      }
      console.log("[idcard-data]", payload);
      window.electronAPI.log("info", `[idcard-data] received`);
      window.electronAPI.log(
        "info",
        `Read IDCard success: ${payload.name} ${payload.id_card_no}`
      );

      // 清理倒计时
      if (timerRef.current) {
        clearTimeout(timerRef.current);
        timerRef.current = null;
      }
      if (intervalRef.current) {
        clearInterval(intervalRef.current);
        intervalRef.current = null;
      }

      // 重置监听的辅助函数
      const resetListening = () => {
        window.electronAPI
          .stopIdCardListen()
          .then(() => {
            setTimeout(() => {
              window.electronAPI
                .startIdCardListen()
                .catch((e: any) => console.error(e));
            }, 1000);
          })
          .catch(() => { });
      };

      // 先验证档案信息，查询到才跳转
      const idCardNo = payload.id_card_no;
      if (!idCardNo) {
        setErrorMsg("未读取到身份证号");
        setReading(false);
        isProcessingRef.current = false;
        resetListening();
        return;
      }

      getPatientInfo(idCardNo)
        .then((res) => {
          if (res.Status === 200 && res.Data) {
            // 查询成功，跳转到 u2
            window.electronAPI.stopIdCardListen().catch(() => { });
            setReading(false);
            isProcessingRef.current = false;
            navigate("/u2");
          } else {
            // 未查询到档案信息，显示错误提示，不跳转
            setErrorMsg("未查询到您的档案信息，详情请咨询前台工作人员!");
            setReading(false);
            isProcessingRef.current = false;
            resetListening();
          }
        })
        .catch((err) => {
          console.error("getPatientInfo error", err);
          setErrorMsg("获取用户信息异常，请联系前台工作人员");
          setReading(false);
          isProcessingRef.current = false;
          resetListening();
        });
    });

    window.electronAPI.onIdCardError((e: any) => {
      console.error("[idcard-error]", e.payload);
      window.electronAPI.log("error", `[idcard-error] ${e.payload}`);
    });

    return () => {
      window.electronAPI.stopIdCardListen().catch(() => { });
      window.electronAPI.removeIdCardListeners();
      if (timerRef.current) clearTimeout(timerRef.current);
      if (intervalRef.current) clearInterval(intervalRef.current);
      if (errorTimerRef.current) clearTimeout(errorTimerRef.current);
    };
  }, [navigate]);

  // 错误信息 10 秒后自动消失
  useEffect(() => {
    if (errorMsg) {
      if (errorTimerRef.current) clearTimeout(errorTimerRef.current);
      errorTimerRef.current = window.setTimeout(() => {
        setErrorMsg("");
        errorTimerRef.current = null;
      }, 10000);
    }
    return () => {
      if (errorTimerRef.current) {
        clearTimeout(errorTimerRef.current);
        errorTimerRef.current = null;
      }
    };
  }, [errorMsg]);

  const handleStart = () => {
    if (reading) return; // 避免重复点击
    setReading(true);
    // isProcessingRef.current = true; // 不需要手动设置，等待读卡数据
    setCountdown(6);
    setErrorMsg(""); // 清空之前的错误信息

    // 6 秒倒计时逻辑
    if (intervalRef.current) clearInterval(intervalRef.current);
    intervalRef.current = window.setInterval(() => {
      setCountdown((prev) => {
        if (prev <= 1) {
          if (intervalRef.current) clearInterval(intervalRef.current);
          return 0;
        }
        return prev - 1;
      });
    }, 1000);

    // 6 秒超时恢复
    if (timerRef.current) {
      clearTimeout(timerRef.current);
      timerRef.current = null;
    }
    timerRef.current = window.setTimeout(() => {
      console.warn("未在 6 秒内读取到身份证信息，恢复初始状态");
      setReading(false);
      // isProcessingRef.current = false;
      if (intervalRef.current) {
        clearInterval(intervalRef.current);
        intervalRef.current = null;
      }
      timerRef.current = null;
    }, 6000);
  };

  return (
    <div className="u1-root">
      <span className="u1-title">
        欢迎使用圆和医疗
        <br />
        自助签到系统
      </span>
      <DecorLine />
      <img alt="card reader" src={idcard} />
      <div className="u1-instruction-wrapper">
        <span className="u1-instruction">请放置身份证在读卡区域</span>
        {errorMsg && <span className="u1-error">{errorMsg}</span>}
      </div>
      <img className="u1-semicircle" alt="start button" src={semicircle} />
      {!reading && <LongButton text="开始签到" onClick={handleStart} />}
      {reading && (
        <LongButtonLoading text={`身份信息读取中... ${countdown}s`} />
      )}
    </div>
  );
};

export default U1;