#!/usr/bin/env node
"use strict";

const fs = require("fs");
const path = require("path");
const { createRequire } = require("module");

const [pkgDirArg, ...converterArgs] = process.argv.slice(2);

if (!pkgDirArg || converterArgs.length < 2) {
  console.error(
    "Usage: transxchange2gtfs_shim.js <package-dir> <input...> <output>",
  );
  process.exit(2);
}

const pkgDir = path.resolve(pkgDirArg);

function replaceOnce(relativePath, before, after) {
  const file = path.join(pkgDir, relativePath);
  const original = fs.readFileSync(file, "utf8");
  if (original.includes(before)) {
    fs.writeFileSync(file, original.replace(before, after));
  } else if (original.includes(after)) {
    return;
  } else {
    throw new Error(`Could not patch ${relativePath}: expected text not found`);
  }
}

// The published 1.12.0 package has a few compatibility issues with current
// TfL TransXChange exports:
// - the bin script points at dist/src/cli.js, but the package ships dist/cli.js
// - the compiled date-holidays import expects a synthetic default export
// - some TfL journeys reference timing links without matching route-link geometry
//
// GTFS shapes are optional for R5 routing. Clear shape references and omit
// shapes.txt so missing route geometry does not drop otherwise usable trips.
function patchPackage() {
  replaceOnce(
    "dist/transxchange/TransXChangeJourneyStream.js",
    "distanceSoFarM += routeLink.Distance;",
    "distanceSoFarM += routeLink ? routeLink.Distance : 0;",
  );
  replaceOnce(
    "dist/gtfs/TripsStream.js",
    "(0, crypto_1.createHash)('md5').update(JSON.stringify({ routeId: journey.route, routeLinkSeq: journey.routeLinkIds })).digest(\"hex\"));",
    "\"\");",
  );
  replaceOnce(
    "dist/gtfs/StopTimesStream.js",
    "stop.shapeDistTraveled, stop.exactTime ? \"1\" : \"0\");",
    "\"\", stop.exactTime ? \"1\" : \"0\");",
  );
  replaceOnce(
    "dist/Container.js",
    "\"stops.txt\": transxchange.pipe(new StopsStream_1.StopsStream(naptanIndex)),\n            \"shapes.txt\": journeyStream.pipe(new ShapesStream_1.ShapesStream())",
    "\"stops.txt\": transxchange.pipe(new StopsStream_1.StopsStream(naptanIndex))",
  );
  replaceOnce(
    "dist/Container.js",
    "\"routes.txt\": transxchange.pipe(new RoutesStream_1.RoutesStream()),\n            \"transfers.txt\": transxchange.pipe(new TransfersStream_1.TransfersStream(naptanIndex, locationIndex)),\n            \"stops.txt\": transxchange.pipe(new StopsStream_1.StopsStream(naptanIndex))",
    "\"routes.txt\": transxchange.pipe(new RoutesStream_1.RoutesStream()),\n            \"stops.txt\": transxchange.pipe(new StopsStream_1.StopsStream(naptanIndex))",
  );
}

patchPackage();

const pkgRequire = createRequire(path.join(pkgDir, "package.json"));
const Holidays = pkgRequire("date-holidays");
if (!Holidays.default) {
  Holidays.default = Holidays;
}

process.argv = [process.argv[0], "transxchange2gtfs", ...converterArgs];
require(path.join(pkgDir, "dist", "cli.js"));