'use strict';

const path = require('path');
const fs   = require('fs');

/* eslint-disable no-param-reassign */

const details = () => ({
  name: 'Extract Chapters to XML',
  description:
    'Extracts MKV chapter markers to an XML file next to the original source using mkvextract. '
    + 'Stores the output path in args.variables.chaptersXmlPath. '
    + 'Safe to run even if the source has no chapters.',
  style: { borderColor: '#9C27B0' },
  tags: 'utility,chapters,mkv',
  isStartPlugin: false,
  pType: '',
  requiresVersion: '2.11.01',
  sidebarPosition: -1,
  icon: 'faList',
  inputs: [],
  outputs: [
    { number: 1, tooltip: 'Continue to next plugin' },
  ],
});

const plugin = async (args) => {
  const { jobLog, inputFileObj, variables, workDir, updateWorker } = args;

  const inputFile = inputFileObj._id;
  // Keep sidecar files in the library when a prior plugin copied the media to workDir.
  const originalFile = variables.originalLibraryFile || inputFile;
  const targetDir    = variables.originalLibraryDir || path.dirname(originalFile);
  const baseName     = path.basename(originalFile, path.extname(originalFile));
  const xmlPath      = path.join(targetDir, `${baseName}_chapters.xml`);

  jobLog(`[extractChaptersXml] Source: ${inputFile}\n`);
  jobLog(`[extractChaptersXml] Output: ${xmlPath}\n`);

  // Derive mkvextract from mkvpropeditPath (same MKVToolNix bin dir)
  let mkvExtract = 'mkvextract';
  if (args.mkvpropeditPath) {
    const dir       = path.dirname(args.mkvpropeditPath);
    const candidate = path.join(dir, process.platform === 'win32' ? 'mkvextract.exe' : 'mkvextract');
    if (fs.existsSync(candidate)) mkvExtract = candidate;
  }
  jobLog(`[extractChaptersXml] Using: ${mkvExtract}\n`);

  const { CLI } = require('../../../../FlowHelpers/1.0.0/cliUtils');
  const cli = new CLI({
    cli: mkvExtract,
    spawnArgs: [inputFile, 'chapters', xmlPath],
    WorkDir: workDir,
    jobLog,
    inputFileObj,
    updateWorker,
    args,
  });

  const { cliExitCode } = await cli.runCli();

  // mkvextract: exit 0 = OK, exit 1 = no chapters (still OK), exit 2 = error
  if (cliExitCode > 1) {
    jobLog(`[extractChaptersXml] WARNING: mkvextract exit ${cliExitCode} — chapters may be missing.\n`);
    variables.chaptersXmlPath = '';
  } else if (fs.existsSync(xmlPath) && fs.statSync(xmlPath).size > 50) {
    variables.chaptersXmlPath = xmlPath;
    jobLog(`[extractChaptersXml] Chapters saved: ${xmlPath}\n`);
  } else {
    jobLog('[extractChaptersXml] No chapters found.\n');
    variables.chaptersXmlPath = '';
  }

  return { outputNumber: 1, outputFileObj: inputFileObj, variables };
};

module.exports.details = details;
module.exports.plugin = plugin;