import { toMatchFile } from 'jest-file-snapshot';

import * as pdfjs from 'pdfjs-dist/es5/build/pdf';
import * as fs from 'fs';
import * as path from 'path';

import PdfParser from 'src/PdfParser';
import PdfPipeline from 'src/PdfPipeline';
import { transformers } from 'src/index';
import Debugger from 'src/Debugger';
import Item from 'src/Item';

const parser = new PdfParser(pdfjs);
const pipeline = new PdfPipeline(parser, transformers);

const folder = '../examples';
const files = fs.readdirSync(folder).filter((file) => file.endsWith('.pdf'));

expect.extend({ toMatchFile });

describe.each(files)('Test %p', (file) => {
  const data = fs.readFileSync(`${folder}/${file}`);

  let debug: Debugger;
  beforeAll(async () => (debug = await pipeline.debug(data, () => {})));

  test.each(transformers.map((t) => t.name))('stage %p', (transformerName) => {
    const stageResults = debug.stageResults(debug.stageNames.indexOf(transformerName));

    const chunkedLines: string[][] = [[]];
    let resultIndex = 0;
    let collectedItems = 0;
    stageResults.selectPages(true, true).forEach((page) => {
      page.itemGroups.forEach((itemGroup) => {
        const change = stageResults.changes.change(itemGroup.top);
        if (change || stageResults.descriptor.debug?.showAll) {
          const item = itemGroup.top;
          const changeType = change?.constructor.name || 'none';
          chunkedLines[resultIndex].push(itemToString(debug.fontMap, item, changeType));
          collectedItems++;
        }
      });

      // we split results to multiple files to circumvent githubs 100MB limit
      resultIndex = Math.floor(collectedItems / 450_000);
      if (resultIndex === chunkedLines.length) {
        chunkedLines.push([]);
      }
    });

    // Global characteristics
    let groupedItemCount = stageResults
      .selectPages(false, true)
      .reduce((itemCount, page) => itemCount + page.itemGroups.length, 0);
    chunkedLines[0].unshift(
      JSON.stringify(
        {
          pages: stageResults.pages.length,
          items: stageResults.itemsUnpacked().length,
          groupedItems: groupedItemCount,
          changes: stageResults.changes.changeCount(),
          schema: stageResults.schema,
          // messages: stageResults.messages,
        },
        null,
        2,
      ),
    );

    chunkedLines.forEach((lines, idx) => {
      const transformerResultAsString = lines.join('\n') || '{}';
      const resultFolder = `${folder}/${file.substr(0, file.length - 4)}`;
      const fileName = `${transformerName[0].toLowerCase() + transformerName.slice(1).replace(/\s/g, '')}`;
      const fileIndex = chunkedLines.length > 1 ? `.${idx}` : '';
      const resultFile = `${resultFolder}/${fileName}${fileIndex}.json`;
      expect(transformerResultAsString).toMatchFile(resultFile);
    });
  });
});

function itemToString(fontMap: Map<string, object>, item: Item, changeType: string): string {
  const fontName: string | Array<string> = item.data['fontName'];
  let newFontName: string | Array<string> | undefined = undefined;
  if (fontName) {
    if (typeof fontName === 'string') {
      newFontName = fontMap.get(fontName)?.['name'] as string;
    } else {
      newFontName = fontName.map((name) => fontMap.get(name)?.['name']);
    }
  }
  const transform: undefined | number[] = item.data['transform'];
  let newTransform;
  if (transform) {
    newTransform = transform.map((num) => num.toFixed(2));
  }
  return JSON.stringify({
    page: item.page,
    change: changeType,
    ...item.data,
    fontName: newFontName,
    height: item.data['height'].toFixed(2),
    width: item.data['width'].toFixed(2),
    transform: newTransform,
  });
}