import { useEffect, useRef } from 'react'
import * as PDFJS from 'pdfjs-dist'

PDFJS.GlobalWorkerOptions.workerSrc = `//unpkg.com/pdfjs-dist@${pdfjs.version}/legacy/build/pdf.worker.min.js`

interface Props {
  fileUrl: string
}

const FilePDF = ({ fileUrl }: Props) => {
  const pdfContainer = useRef<HTMLCanvasElement>(null)
  const pdfCtx = useRef<CanvasRenderingContext2D | null>(null)
  const pdfDoc = useRef<any>()
  const pdfNumPages = useRef(0)

	// 依次渲染所有頁面
  const renderPage = num => {
    pdfDoc.current!.getPage(num).then(page => {
      const viewport = page.getViewport({ scale: 1 })
      pdfContainer.current!.width = viewport.width
      pdfContainer.current!.height = viewport.height

      page
        .render({
          viewport,
          canvasContext: pdfCtx.current!
        })
        .promise.then(() => {
          if (num < pdfNumPages.current) {
            renderPage(num + 1)
          }
        })
    })
  }

  useEffect(() => {
    pdfCtx.current = pdfContainer.current!.getContext('2d')

    PDFJS.getDocument(fileUrl).promise.then(pdfDoc_ => {
      pdfDoc.current = pdfDoc_
      pdfNumPages.current = pdfDoc_.numPages
      renderPage(1)
    })
  }, [])

  return (
    <div className={'flex h-full w-full items-center justify-center rounded-lg'}>
      <canvas ref={pdfContainer}></canvas>
    </div>
  )
}

export default FilePDF

import { useRef, useState } from 'react'
import { Document, Page, pdfjs } from 'react-pdf'
import 'react-pdf/dist/Page/AnnotationLayer.css'
import 'react-pdf/dist/Page/TextLayer.css'

pdfjs.GlobalWorkerOptions.workerSrc = `//unpkg.com/pdfjs-dist@${pdfjs.version}/legacy/build/pdf.worker.min.js`

interface Props {
  fileUrl: string
}

const FilePDF = ({ fileUrl }: Props) => {
  const documentRef = useRef<HTMLDivElement>()
  const scale = useRef(1)
  const [pageNumber, setPageNumber] = useState<number>(1)

  const renderDocumentPage = (num: number, total: number) => {
    if (num <= total) {
      setPageNumber(num)
      requestIdleCallback(() => renderDocumentPage(num + 1, total))
    }
  }

  const onDocumentLoadSuccess = ({ numPages, ...rest }: { numPages: number }) => {
    requestIdleCallback(() => renderDocumentPage(1, numPages))
  }

  return (
    <div
      className={
        'flex h-full w-full justify-center overflow-auto rounded-lg bg-[#525659]'
      }
    >
      <Document
        ref={documentRef}
        file={fileUrl}
        onLoadSuccess={onDocumentLoadSuccess}
        loading="努力加載中..."
        renderMode="canvas"
      >
        {Array.from({ length: pageNumber }).map((_, i) => (
          <Page pageNumber={i + 1} className="mt-6" loading="努力加載中..." />
        ))}
      </Document>
    </div>
  )
}

export default FilePDF

interface Props {
  fileUrl: string
}

const FilePDF = ({ fileUrl }: Props) => {
  return (
    <div className={'h-full w-full overflow-hidden rounded-lg'}>
      <iframe
        className="border-0"
        title="預覽文檔"
        src={`/graphicPlatform/web/viewer.html?file=${encodeURIComponent(fileUrl)}`}
        width="100%"
        height="100%"
      ></iframe>
    </div>
  )
}

export default FilePDF