import { useEffect, useRef, useState } from 'react';

import { submitDaojiandanSign } from '../../api';
import type { ExamClient } from '../../data/mockData';
import { setExamActionRecord } from '../../utils/examActions';
import type { SignaturePadHandle } from '../ui';
import { Button, SignaturePad } from '../ui';

export const ExamPrintPanel = ({ client }: { client: ExamClient }) => {
  const [pdfUrl, setPdfUrl] = useState<string | null>(null);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [pdfReady, setPdfReady] = useState(false);
  const [pdfBlobUrl, setPdfBlobUrl] = useState<string | null>(null);
  const [signatureSubmitted, setSignatureSubmitted] = useState(false);
  const [submitLoading, setSubmitLoading] = useState(false);
  const [submitMessage, setSubmitMessage] = useState<string | null>(null);
  const signaturePadRef = useRef<SignaturePadHandle | null>(null);
  const printRef = useRef<HTMLDivElement>(null);
  const iframeRef = useRef<HTMLIFrameElement>(null);

  const handleSubmitSign = async () => {
    const examId = Number(client.id);
    if (!examId) {
      setSubmitMessage('无效的体检ID');
      return;
    }

    const dataUrl = signaturePadRef.current?.toDataURL('image/png');
    if (!dataUrl) {
      setSubmitMessage('请先完成签名');
      return;
    }

    setSubmitLoading(true);
    setSubmitMessage(null);
    try {
      // 将 base64 转换为 Blob
      const blob = await fetch(dataUrl).then(r => r.blob());

      // 提交签名生成导检单PDF
      const res = await submitDaojiandanSign({
        exam_id: examId,
        sign_file: blob,
      });

      if (res.Status === 200 && res.Data?.pdf_url) {
        setSubmitMessage('签名提交成功，正在加载导检单...');
        setSignatureSubmitted(true);
        setPdfUrl(res.Data.pdf_url);
        // 记录打印导检单是否签名操作
        setExamActionRecord(examId, 'printSign', true);
      } else {
        setSubmitMessage(res.Message || '签名提交失败');
      }
    } catch (err) {
      console.error('提交签名失败', err);
      setSubmitMessage('签名提交失败，请稍后重试');
    } finally {
      setSubmitLoading(false);
    }
  };

  useEffect(() => {
    if (!pdfUrl) return;

    let objectUrl: string | null = null;
    setPdfReady(false);
    setLoading(true);

    fetch(pdfUrl)
      .then((resp) => {
        if (!resp.ok) throw new Error('获取PDF文件失败');
        return resp.blob();
      })
      .then((blob) => {
        objectUrl = URL.createObjectURL(blob);
        setPdfBlobUrl(objectUrl);
      })
      .catch((err) => {
        console.error('PDF 拉取失败', err);
        setError('PDF 加载失败，请稍后重试');
      })
      .finally(() => {
        setLoading(false);
      });

    return () => {
      if (objectUrl) {
        URL.revokeObjectURL(objectUrl);
      }
    };
  }, [pdfUrl]);

  const handlePrint = () => {
    if (!pdfBlobUrl || !pdfReady) return;
    const printWindow = window.open(pdfBlobUrl, '_blank');
    if (printWindow) {
      printWindow.onload = () => {
        printWindow.focus();
        printWindow.print();
      };
    }
  };

  return (
    <div className='flex justify-center'>
      <div className='w-full max-w-[95%] bg-white rounded-2xl border shadow-sm px-6 py-4 text-xs text-gray-800'>
        <div className='flex items-center justify-between border-b pb-3 mb-3'>
          <div>
            <div className='text-sm font-semibold'>圆和医疗体检中心 · 导检单预览</div>
            <div className='text-[11px] text-gray-500 mt-1'>
              {signatureSubmitted
                ? '此为预览页面，实际打印效果以院内打印机为准。'
                : '请先完成签名，签名后将生成导检单PDF'}
            </div>
          </div>
          <div className='flex items-center gap-3'>
            <div className='text-right text-[11px] text-gray-500'>
              <div>体检号：{client.id}</div>
              <div>日期：{new Date().toLocaleDateString('zh-CN')}</div>
            </div>
            {signatureSubmitted && (
              <Button
                className='px-4 py-1.5 text-xs bg-blue-600 hover:bg-blue-700 text-white disabled:opacity-50 disabled:cursor-not-allowed'
                onClick={handlePrint}
                disabled={loading || !pdfReady || !pdfUrl}
              >
                打印
              </Button>
            )}
          </div>
        </div>

        {!signatureSubmitted ? (
          <div className='flex flex-col gap-4'>
            <div className='text-sm font-medium text-gray-900'>请在下方区域签名</div>
            <div className='ui7-signature-wrapper border rounded-xl overflow-hidden bg-gray-50'>
              <SignaturePad
                ref={signaturePadRef}
                className='ui7-signature-canvas w-full h-72 bg-white touch-none'
              />
              <div className='flex items-center justify-between px-3 py-2 bg-gray-50 border-t'>
                <div className='text-xs text-gray-500'>请在上方区域签名</div>
                <Button
                  className='ui7-clear-button py-1 px-3'
                  onClick={() => signaturePadRef.current?.clear()}
                  disabled={submitLoading}
                >
                  清除
                </Button>
              </div>
            </div>
            {submitMessage && (
              <div
                className={`text-sm text-center ${submitMessage.includes('成功') ? 'text-green-600' : 'text-amber-600'
                  }`}
              >
                {submitMessage}
              </div>
            )}
            <div className='flex items-center justify-end gap-3'>
              <Button
                className='py-2 px-6 bg-blue-600 text-white hover:bg-blue-700'
                onClick={handleSubmitSign}
                disabled={submitLoading}
              >
                {submitLoading ? '提交中...' : '提交签名'}
              </Button>
            </div>
          </div>
        ) : loading ? (
          <div className='flex items-center justify-center py-12 text-gray-500'>
            <div>正在加载PDF...</div>
          </div>
        ) : error ? (
          <div className='flex flex-col items-center justify-center py-12 text-gray-500'>
            <div className='mb-2'>{error}</div>
            <Button
              className='px-4 py-1.5 text-xs'
              onClick={() => {
                setError(null);
                setPdfUrl(null);
                setSignatureSubmitted(false);
                signaturePadRef.current?.clear();
              }}
            >
              重新签名
            </Button>
          </div>
        ) : pdfUrl ? (
          <div className='w-full'>
            <div ref={printRef} className='print-content'>
              <div className='flex justify-center border rounded-lg p-4 bg-gray-50 overflow-auto max-h-[600px]'>
                <iframe
                  src={pdfBlobUrl || ''}
                  className='w-full h-[600px] border rounded-lg'
                  title='导检单PDF预览'
                  onLoad={() => setPdfReady(true)}
                  ref={iframeRef}
                />
              </div>
            </div>
          </div>
        ) : null}
      </div>
    </div>
  );
};