import { Button, message, Modal, Spin } from "antd";
import { renderAsync } from "docx-preview";
import { useEffect, useRef, useState } from "react";
import useDownloadFile from "../../hooks/useDownloadFile";
import { getFileUrl } from "../../utils";

/**
 * Word 查看组件。
 */
function Word(props) {
  const {
    visible = false,
    onCancel,
    file,
    name,
    inline = false,
    title = "Word预览",
    style = {},
  } = props;

  const contentRef = useRef(null);
  const fullscreenRef = useRef(null);
  const unmountedRef = useRef(false);
  const fileUrl = getFileUrl();
  const [loading, setLoading] = useState(false);
  const { downloadFile } = useDownloadFile();

  const renderWord = async () => {
    setLoading(true);
    contentRef.current.innerHTML = "";
    try {
      const response = await fetch(!file.includes(fileUrl) ? fileUrl + file : file);
      if (!response.ok)
        throw new Error("加载 Word 文件失败");
      const data = await response.arrayBuffer();
      if (unmountedRef.current)
        return;
      await renderAsync(data, contentRef.current, null, {
        className: "docx-preview",
        inWrapper: true,
        ignoreWidth: false,
        ignoreHeight: false,
        breakPages: true,
      });
    }
    catch {
      message.error("加载 Word 文件失败");
      if (!inline && onCancel)
        onCancel();
    }
    finally {
      if (!unmountedRef.current)
        setLoading(false);
    }
  };

  useEffect(() => {
    if ((!visible && !inline) || !file)
      return;

    unmountedRef.current = false;
    const initTimer = setTimeout(() => {
      renderWord();
    }, 100);

    return () => {
      unmountedRef.current = true;
      if (contentRef.current)
        contentRef.current.innerHTML = "";
      if (initTimer)
        clearTimeout(initTimer);
    };
  }, [visible, inline, file]);

  const renderWordContent = () => (
    <Spin spinning={loading}>
      <div
        style={{ height: "72vh", overflowY: "auto", padding: "24px", background: "#f5f5f5", ...style }}
      >
        <div ref={contentRef} />
      </div>
    </Spin>
  );

  if (inline)
    return renderWordContent();

  const onDownloadFile = () => {
    downloadFile({
      url: file,
      name,
    });
  };

  return (
    <div ref={fullscreenRef}>
      <Modal
        style={{ top: 100, maxWidth: "calc(100vw - 32px)", paddingBottom: 24 }}
        open={visible}
        mask={{ closable: false }}
        width={900}
        title={title}
        onCancel={() => {
          onCancel();
        }}
        getContainer={false}
        footer={[
          <Button
            key="cancel"
            onClick={() => {
              onCancel();
            }}
          >
            关闭
          </Button>,
          <Button key="download" type="primary" onClick={onDownloadFile}>下载</Button>,
        ]}
      >
        {renderWordContent()}
      </Modal>
    </div>
  );
}

Word.displayName = "Word";

export default Word;