const { dest, watch } = require('gulp');
const ts = require('gulp-typescript');
const fs = require('fs');
const path = require('path');
const sourcemaps = require('gulp-sourcemaps');

const tsProject = ts.createProject('tsconfig.json');

function deleteFolderRecursive(folder) {
  if (fs.existsSync(folder)) {
    fs.readdirSync(folder).forEach(function(file) {
      const currPath = path.resolve(folder, file);
      if (fs.lstatSync(currPath).isDirectory()) {
        deleteFolderRecursive(currPath);
      } else {
        fs.unlinkSync(currPath);
      }
    });
    fs.rmdirSync(folder);
  }
}

function removeCompiledMigrations() {
  const migrationsDir = path.resolve('dist/main/migrations');
  deleteFolderRecursive(migrationsDir);
}

function tsc() {
  removeCompiledMigrations();

  return tsProject
    .src()
    .pipe(sourcemaps.init())
    .pipe(tsProject())
    .pipe(sourcemaps.write('.', { sourceRoot: './', includeContent: false }))
    .pipe(dest('dist'));
}

exports.tsc = tsc;
exports['tsc:watch'] = () => {
  watch('./src/**/*.ts', { ignoreInitial: false }, tsc);
};