#!/usr/bin/env node
'use strict';

const path = require('path');
const fs = require('fs-extra');

// Load environment before any other imports
const args = process.argv.slice(2);
let envFile = './environment.env';
let outputPath = path.resolve(process.cwd(), 'test-logs/promo-expired-preview.html');
const cli = {};

for (let i = 0; i < args.length; i++) {
  switch (args[i]) {
    case '--env':
      if (args[i + 1]) envFile = args[++i];
      break;
    case '--email':
      if (args[i + 1]) cli.to = args[++i];
      break;
    case '--lang':
      if (args[i + 1]) cli.lang = args[++i];
      break;
    case '--name':
      if (args[i + 1]) cli.name = args[++i];
      break;
    case '--promo':
      if (args[i + 1]) cli.promoName = args[++i];
      break;
    case '--subType':
      if (args[i + 1]) cli.subType = args[++i];
      break;
    case '--date':
      if (args[i + 1]) cli.newBillingDate = args[++i];
      break;
    case '--amount':
      if (args[i + 1]) cli.chargeAmount = args[++i];
      break;
    case '--discount':
      if (args[i + 1]) cli.promoDiscount = args[++i];
      break;
    case '--startDate':
      if (args[i + 1]) cli.promoStartDate = args[++i];
      break;
    case '--endDate':
      if (args[i + 1]) cli.promoEndDate = args[++i];
      break;
    case '--out':
      if (args[i + 1]) outputPath = path.resolve(process.cwd(), args[++i]);
      break;
    default:
      break;
  }
}

const envPath = path.resolve(process.cwd(), envFile);
require('dotenv').config({ path: envPath });

const Email = require('email-templates');
const hbs = require('handlebars');
const env = require('../helpers/env');
const { DEFAULT_LANG } = require('../helpers/constants');
require('../helpers/mailer'); // Registers partials/helpers on load

async function main() {
  const supportedLocales = ['en', 'es', 'pt'];
  const langRaw = (cli.lang || process.env.LANG || DEFAULT_LANG).split(',')[0];
  const lang = supportedLocales.includes(langRaw.split('.')[0].split('_')[0])
    ? langRaw.split('.')[0].split('_')[0]
    : DEFAULT_LANG;
  const baseFromEnv = process.env.BASE_URL || process.env.APP_URL;
  const baseUrl = (baseFromEnv || `https://${env.PRODUCTION ? 'agmission.agnav.com' : 'localhost:4200'}`).replace(/\/$/, '');

  const locals = {
    locale: lang,
    lang,
    name: cli.name || 'Sample Customer',
    promoName: cli.promoName || 'Seasonal Discount',
    subName: cli.subType || 'AgMission Essentials 2',
    subKind: 'package',
    promoDiscount: cli.promoDiscount || '20% off',
    promoStartDate: cli.promoStartDate || 'January 1, 2024 UTC',
    promoEndDate: cli.promoEndDate || 'March 31, 2024 UTC',
    newBillingDate: cli.newBillingDate || 'July 30, 2024 UTC',
    chargeAmount: cli.chargeAmount || '$49.00',
    isTaxable: true,   // set to false to test non-taxable variant
    manageSubUrl: `${baseUrl}/${lang}/#/manage-subscription`,
    baseUrl
  };

  const email = new Email({
    message: {
      from: 'AgMission <noreply@agnav.com>',
      to: cli.to || 'preview@agnav.com'
    },
    send: false,
    preview: false,
    i18n: {
      locales: ['en', 'es', 'pt'],
      defaultLocale: lang,
      directory: path.join(process.cwd(), 'locales')
    },
    views: {
      root: path.join(process.cwd(), 'emails'),
      options: { extension: 'hbs' },
      engineSource: { requires: { handlebars: hbs } }
    }
  });

  const subject = (await email.render('promo-expired/subject', locals)).trim();
  const html = await email.render('promo-expired/html', locals);

  await fs.ensureDir(path.dirname(outputPath));
  await fs.writeFile(outputPath, html, 'utf8');

  console.log('Promo expired preview generated.');
  console.log('Subject:', subject);
  console.log('HTML saved to:', outputPath);
}

main().catch((err) => {
  console.error('Failed to render promo expired email:', err);
  process.exit(1);
});