#!/usr/bin/env node

import { exit } from "process";
import { resolve, basename } from "path";
import { readCliArgument } from "./lib/arguments.js";
import { ERROR } from "./lib/result.js";
import { readFile, writeFile } from "./lib/file.js";
import { parse } from "./lib/gpx.js";

async function main() {
  // Read cli argument. Exit if there are no one.
  const argumentReadingResult = readCliArgument();

  if (argumentReadingResult[0] === ERROR) {
    console.error(argumentReadingResult[1]);
    exit(1);
  }

  const filePath = resolve(argumentReadingResult[1]);

  // Try to open file. Exit if some errors.
  const fileReadingResult = await readFile(filePath);

  if (fileReadingResult[0] === ERROR) {
    console.error(fileReadingResult[1]);
    exit(1);
  }

  const parsedSegments = parse(fileReadingResult[1]);

  if (parsedSegments[0] === ERROR) {
    console.error(parsedSegments[1]);
    exit(1);
  }

  const segmentsToCsv = parsedSegments[1]
    .map((segment) => segment.join(","))
    .join("\n");

  const baseFileName = basename(filePath, ".gpx");
  const fileName = resolve(`${baseFileName}.csv`);
  const writeFileResult = await writeFile(fileName, segmentsToCsv);

  if (writeFileResult[0] === ERROR) {
    console.error(writeFileResult[1]);
    exit(1);
  } else {
    console.log(writeFileResult[1]);
    exit(0);
  }
}

main();