import fs from 'node:fs'
import { getDocument } from 'pdfjs-dist/legacy/build/pdf.mjs'
import { WorkerMessageHandler } from 'pdfjs-dist/legacy/build/pdf.worker.mjs'
import { parseEncodedVaccinationRecordMetadata } from '../../src/lib/vaccinationRecordMetadata.js'

globalThis.pdfjsWorker = { WorkerMessageHandler }

/**
 * @param {string} filePath
 * @returns {Promise<{ patientName: string, dateOfBirth: string, notes: string, rows: object[] }>}
 */
export async function parseVaccinationRecordPdf(filePath) {
  const data = new Uint8Array(fs.readFileSync(filePath))
  const doc = await getDocument({ data, useSystemFonts: true }).promise
  const page = await doc.getPage(1)
  const content = await page.getTextContent()

  const textItems = content.items.map((item) => item.str)
  const metadataText =
    textItems.find((s) => s.startsWith('CTM_VR:')) ??
    textItems.find((s) => s.includes('CTM_VR:')) ??
    textItems.join('')
  return parseEncodedVaccinationRecordMetadata(metadataText)
}