#!/usr/bin/env node

const fs = require("fs");
const path = require("path");
const yaml = require("yaml");
const { exec, execSync } = require("child_process");

const puppeteer = require("puppeteer");
const pug = require("pug");

function parseData(dataFilePath) {
  return yaml.parse(fs.readFileSync(dataFilePath, { encoding: "utf8" }));
}

function createHtml(pugFile, data, outputPath) {
  const rendered = pug.renderFile(pugFile, data);

  fs.writeFile(outputPath, rendered, (err) => {
    if (err) throw err;
  });
}

async function printPDF(url) {
  const browser = await puppeteer.launch({ headless: "new" });
  const page = await browser.newPage();
  await page.goto(url, { waitUntil: "networkidle0" });
  const pdf = await page.pdf({ format: "A4" });

  await browser.close();
  return pdf;
}

function exportToPdf(htmlFile, pdfPath) {
  url = `file://${path.resolve(htmlFile)}`;

  printPDF(url).then((pdf) => {
    fs.writeFile(pdfPath, pdf, (err) => {
      if (err) throw err;
    });
  });
}

function cleanString(string) {
  return string.replaceAll(" ", "_");
}

function exportRenderToPdf(dataFilePath, templatePath, assetsPath, outputPath) {
  const data = parseData(dataFilePath);
  const outputBasename = `CV_${cleanString(data.basics.name)}_${cleanString(data.basics.label)}`;
  const revPath = path.join(outputPath, `${outputBasename}.revision.txt`);
  const htmlPath = path.join(outputPath, `${outputBasename}.html`);
  const pdfPath = path.join(outputPath, `${outputBasename}.pdf`);
  const newAssetsPath = path.join(outputPath, "assets");

  fs.mkdirSync(outputPath, { recursive: true });
  fs.mkdirSync(newAssetsPath, { recursive: true });
  fs.cpSync(assetsPath, newAssetsPath, { recursive: true });

  createHtml(templatePath, data, htmlPath);
  console.log(`Wrote HTML file to ${htmlPath}`);

  exportToPdf(htmlPath, pdfPath);
  console.log(`Wrote PDF file to ${pdfPath}`);

  writeGitRevisionFile(dataFilePath, templatePath, assetsPath, revPath);
}

function writeGitRevisionFile(dataFilePath, templatePath, assetsPath, revPath) {
  const allFiles = `${dataFilePath} ${templatePath} ${assetsPath}`;
  const dirty = areDirty(allFiles);

  const cmd = `git log --format="%H" ${allFiles} | head -1`;
  exec(cmd, (err, stdout, stderr) => {
    if (err) {
      return;
    }

    const newRev = dirty ? `#${stdout}` : stdout;
    fs.appendFile(revPath, newRev, (err) => {
      if (err) throw err;
    });
    console.log(`Wrote ${dirty ? "dirty" : "clean"} revision data to ${revPath}`);
  });
}

function areDirty(fileList) {
  const dirtyStatusCmd = `git diff --quiet ${fileList}`;

  try {
    execSync(dirtyStatusCmd);
    return false;
  } catch {
    return true;
  }
}

const [inputPath, variantName, outputPath] = process.argv.slice(2);
if (!inputPath || !variantName || !outputPath) {
  console.error(`The script should be called like :\n${process.argv[1]} input_path variant_name output_dir`);
  process.exit(1);
}

const dataFilePath = path.join(inputPath, `${variantName}.yaml`);
const templatePath = path.join(inputPath, `template.pug`);
const assetsPath = path.join(inputPath, "assets");

exportRenderToPdf(dataFilePath, templatePath, assetsPath, outputPath);