"use client";
import { Button, Input, Space } from "antd";
import { useEffect, useMemo, useRef, useState } from "react";
import { AudioOutlined, LoadingOutlined } from "@ant-design/icons";

export default function VoiceInput() {
  const [userInput, setUserInput] = useState("");
  const [loading, setLoading] = useState(false);
  const recognition = useRef(null);

  const lastLength = useRef(0);

  useEffect(() => {
    if ("webkitSpeechRecognition" in window) {
      if (recognition.current === null) {
        recognition.current = new window.webkitSpeechRecognition();
      }
    } else {
      console.error("此浏览器不支持webkitSpeechRecognition。");
      return;
    }
    if (!recognition.current) return;
    // 设置语言
    recognition.current.lang = "zh";
    // 开启连续识别
    recognition.current.continuous = true;
    // 开启实时识别
    recognition.current.interimResults = true;

    function onresult(event: any) {
      // 这个事件会把前面识别的结果都返回回来，所以需要取最后一个识别结果
      const length = event.results.length;
      // 没有新的识别结果的时候，事件也会触发，所以这里判断一下如果没有新的识别结果，就不取最后一个识别结果了。
      if (lastLength.current === length) {
        return;
      }

      lastLength.current = length;

      console.log(event.results);

      // 获取最后一个识别结果
      const transcript = event.results[length - 1]?.[0]?.transcript;

      // 将最后一个识别结果添加到文本
      if (transcript) {
        setUserInput((userInput) => userInput + transcript);
      }
    }

    // 监听语音识别结果
    recognition.current.addEventListener("result", onresult);

    return () => {
      if (recognition.current) {
        recognition.current.removeEventListener("result", onresult);
      }
    };
  }, []);

  function click() {
    if (loading) {
      recognition.current.stop();
      setLoading(false);
      return;
    }
    setLoading(true);

    lastLength.current = 0;
    recognition.current.start();
  }

  const icon = useMemo(() => {
    if (loading) {
      return (
        <LoadingOutlined
          style={{
            fontSize: 16,
            color: "#ffffff",
          }}
        />
      );
    }
    return (
      <AudioOutlined
        style={{
          fontSize: 16,
          color: "#ffffff",
        }}
      />
    );
  }, [loading]);

  return (
    <div style={{ textAlign: "center", marginTop: 200 }}>
      <Space.Compact style={{ width: 600 }}>
        <Input size="large" value={userInput} />
        <Button size="large" type="primary" onClick={click} icon={icon} />
      </Space.Compact>
    </div>
  );
}