const fs = require('fs');
const gulp = require('gulp');
const less = require('gulp-less');
const sourcemaps = require('gulp-sourcemaps');
const tsc = require('gulp-typescript');
const del = require('del');
const path = require('path');
const replace = require('gulp-replace');
const template = require('gulp-template');
const tap = require('gulp-tap');
const rename = require('gulp-rename');
const tsProject = tsc.createProject('./tsconfig.json');

gulp.task('clean', function () {
  return del('lib');
});

/**
 * Compile all typescript files
 * and copy to the destination
 */
gulp.task('compile', function () {
  return tsProject
    .src()
    .pipe(sourcemaps.init())
    .pipe(tsProject())
    .pipe(sourcemaps.write('.', { sourceRoot: './', includeContent: false }))
    .on('error', (err) => console.log(err))
    .pipe(gulp.dest('lib'));
});

gulp.task('less', function () {
  return gulp
    .src('./src/**/*.less')
    .pipe(sourcemaps.init())
    .pipe(less())
    .pipe(sourcemaps.write())
    .pipe(gulp.dest(path.join(__dirname, 'lib/src')));
});

const extractFileNameFromPath = (filePath) => {
  const basename = path.basename(filePath);
  const filename = basename.split('.');
  return filename[0];
};

gulp.task('templates', () => {
  return (
    gulp
      .src('./lib/src/renderer/components/*.js', { base: './lib' })
      // tap into the stream to get the current file and compile
      // the template according to that
      .pipe(
        tap(function (file) {
          const jsFilename = extractFileNameFromPath(file.path);
          return gulp
            .src('./src/renderer/react-window.html')
            .pipe(
              template({
                sourcefile: file.path,
              }),
            )
            .pipe(
              replace(
                /(<link rel="stylesheet" href="*"[^>]*>)/g,
                function (_s, _match) {
                  const cssFilePath = `lib/src/renderer/styles/${jsFilename}.css`;
                  const doesFileExist = fs.existsSync(cssFilePath);
                  if (doesFileExist) {
                    const style = fs.readFileSync(cssFilePath, 'utf8');
                    return '<style>\n' + style + '\n</style>';
                  }
                  return '';
                },
              ),
            )
            .pipe(rename(`${jsFilename}.html`))
            .pipe(gulp.dest('./lib/src/renderer'));
        }),
      )
  );
});

/**
 * Copy all assets to JS codebase
 */
gulp.task('copy', function () {
  return gulp
    .src(
      [
        './src/renderer/assets/**',
        './src/renderer/*.html',
        './src/locale/*',
        './package.json',
      ],
      {
        base: './src',
      },
    )
    .pipe(gulp.dest('lib/src'));
});

/**
 * Set expiry time for test builds
 */
gulp.task('setExpiry', function (done) {
  // Set expiry of 15 days for test builds we create from CI
  const expiryDays = process.argv[4] || 15;
  if (expiryDays < 1) {
    console.log(`Not setting expiry as the value provided is ${expiryDays}`);
    done();
    return;
  }

  console.log(`Setting expiry to ${expiryDays} days`);
  const milliseconds = 24 * 60 * 60 * 1000;
  const expiryTime = new Date().getTime() + expiryDays * milliseconds;
  console.log(`Setting expiry time to ${expiryTime}`);

  const ttlHandlerFile = path.join(__dirname, 'src/app/ttl-handler.ts');
  fs.readFile(ttlHandlerFile, 'utf8', function (err, data) {
    if (err) {
      console.error(err);
      return done(err);
    }

    // Do a simple search and replace in the `ttl-handler.ts` file
    const replacementString = `const ttlExpiryTime = ${expiryTime}`;
    const result = data.replace(/const ttlExpiryTime = -1/g, replacementString);

    fs.writeFile(ttlHandlerFile, result, 'utf8', function (err) {
      if (err) {
        return done(err);
      }
      done();
    });
  });
});

gulp.task(
  'build',
  gulp.series('clean', 'compile', 'less', 'templates', 'copy'),
);