import * as chalk from 'chalk';
import { render } from 'ejs';
import * as inquirer from 'inquirer';
import { sync as mkdirpSync } from 'mkdirp';
import * as fs from 'fs';
import * as path from 'path';
import { getProjectDirectoryPath } from './path.helpers';

export class TemplateExtractor {
  public extractTemplateFiles(baseTemplateDir: string, answers: inquirer.Answers): void {
    console.log(chalk.green('Extracting template files...'));
    this.extractTemplateDir(baseTemplateDir, baseTemplateDir, answers);
  }

  private extractTemplateDir(templateDir: string, baseTemplateDir: string, answers: inquirer.Answers) {
    fs.readdirSync(templateDir).forEach((file) => {
      const filePath = path.resolve(templateDir, file);
      const isDir = fs.lstatSync(filePath).isDirectory();
      if (isDir) {
        this.extractTemplateDir(filePath, baseTemplateDir, answers);
      } else {
        this.extractTemplateFile(filePath, baseTemplateDir, answers);
      }
    });
  }

  private extractTemplateFile(sourcePath: string, baseTemplateDir: string, answers: inquirer.Answers) {
    const destPath = sourcePath.replace(baseTemplateDir, getProjectDirectoryPath()).replace(/\.ejs$/, '');

    console.log(sourcePath, destPath);

    const template = fs.readFileSync(sourcePath).toString('utf-8');
    const result = render(template, answers);
    mkdirpSync(path.dirname(destPath));
    fs.writeFileSync(destPath, result);
  }
}