#!/usr/bin/env node
const { readFileSync, writeFileSync, existsSync, mkdirSync } = require('fs');
const { join } = require('path');
const Handlebars = require('handlebars');
const { SESClient, SendEmailCommand } = require('@aws-sdk/client-ses');

function parseArgs() {
  const args = process.argv.slice(2);
  const out = {};
  for (let i = 0; i < args.length; i++) {
    const a = args[i];
    if (a === '--template' && args[i+1]) { out.template = args[++i]; }
    else if (a === '--sample' && args[i+1]) { out.sample = args[++i]; }
    else if (a === '--to' && args[i+1]) { out.to = args[++i]; }
    else if (a === '--send') { out.send = true; }
    else if (a === '--data' && args[i+1]) { out.dataFile = args[++i]; }
  }
  return out;
}

const opts = parseArgs();
const templateName = opts.template || 'universal-template.html';
const sampleType = opts.sample || 'annulation';
const toEmail = opts.to || process.env.TEST_TO_EMAIL || null;
const doSend = !!opts.send;

if (!toEmail && doSend) {
  console.error('To send a real email you must pass --to <email> or set TEST_TO_EMAIL env var');
  process.exit(1);
}

const templatePath = join(process.cwd(), 'templates-mails', templateName);
if (!existsSync(templatePath)) {
  console.error('Template not found:', templatePath);
  process.exit(1);
}
const templateSrc = readFileSync(templatePath, 'utf-8');
const template = Handlebars.compile(templateSrc);

const samples = {
  annulation: {
    subject: 'CDDU annulé',
    preheaderText: 'CDDU annulé pour Jean Dupont · Réf CDD-123',
    title: 'CDDU annulé',
    mainMessage: 'Votre contrat CDDU a été annulé.',
    closingMessage: "Pour votre sécurité, ne partagez jamais ce message.",
    ctaText: "Accès à l'Espace Paie",
    ctaUrl: 'https://example.com/contrat/123',
    footerText: 'Vous recevez cet e-mail car vous êtes client de Odentas.',
    logoUrl: 'https://newstaging.odentas.fr/wp-content/uploads/2025/08/Odentas-Logo-Bleu-Fond-Transparent-4-1.png',
    contractReference: 'CDD-123',
    employeeName: 'Jean Dupont',
    profession: 'Développeur',
    startDate: '2025-10-01',
    showCard: true,
    cardTitle: 'Détails du contrat',
    cardRows: [
      [ { label: 'Référence', value: 'CDD-123' } ],
      [ { label: 'Salarié', value: 'Jean Dupont' } ],
      [ { label: 'Poste', value: 'Développeur' } ],
      [ { label: 'Date de début', value: '2025-10-01' } ]
    ],
    showChips: false,
    headerColor: '#efc543',
    titleColor: '#0F172A',
    buttonColor: '#efc543',
    cardBorder: '1px solid #E5E7EB',
    cardBackgroundColor: '#F8FAFC',
    cardTitleColor: '#0F172A',
    alertIndicatorColor: '#EF4444',
    supportUrl: 'https://example.com/support',
    userName: 'Jean Dupont',
    companyName: 'Ma Structure',
    employerCode: 'EMP-456',
    productionName: 'Production A',
    textFallback: 'CDDU annulé – Réf CDD-123 pour Jean Dupont.'
  }
};

let sampleData = samples[sampleType] || samples.annulation;

// allow loading a JSON data file with overrides
if (opts.dataFile) {
  try {
    const raw = readFileSync(join(process.cwd(), opts.dataFile), 'utf8');
    const userData = JSON.parse(raw);
    sampleData = { ...sampleData, ...userData };
  } catch (err) {
    console.warn('Unable to read/parse data file, ignoring:', opts.dataFile);
  }
}

const rendered = template(sampleData);

// apply data-* attributes to inline styles (simple)
function applyDataAttrAsStyle(html, dataAttr, cssProp) {
  // append to existing style
  html = html.replace(new RegExp(`(<[^>]*?)${dataAttr}="([^"]*)"([^>]*style=\")([^"]*)(\"[^>]*>)`, 'g'), (_m, prefix, val, mid, styleValue, suffix) => {
    return `${prefix}${mid}${styleValue} ${cssProp}:${val};${suffix}`;
  });
  // add style when missing
  html = html.replace(new RegExp(`(<[^>]*?)${dataAttr}="([^"]*)"([^>]*?)>`, 'g'), (_m, prefix, val, suffix) => {
    return `${prefix} style="${cssProp}:${val};"${suffix}>`;
  });
  html = html.replace(new RegExp(`${dataAttr}="[^"]*"`, 'g'), '');
  return html;
}

let finalHtml = rendered;
['data-header-color','data-alert-indicator','data-title-color','data-card-border','data-card-bg','data-card-title-color','data-alert-title-color','data-alert-text-color','data-button-color'].forEach(attr => {
  const css = {
    'data-header-color':'background',
    'data-alert-indicator':'background',
    'data-title-color':'color',
    'data-card-border':'border',
    'data-card-bg':'background',
    'data-card-title-color':'color',
    'data-alert-title-color':'color',
    'data-alert-text-color':'color',
    'data-button-color':'background'
  }[attr];
  finalHtml = applyDataAttrAsStyle(finalHtml, attr, css);
});

if (!existsSync(join(process.cwd(), 'tmp'))) mkdirSync(join(process.cwd(), 'tmp'));
writeFileSync(join(process.cwd(), 'tmp', 'send-preview.html'), finalHtml, 'utf8');
console.log('Wrote preview to tmp/send-preview.html');

if (!doSend) {
  console.log('Dry-run (not sending). To actually send, run with --send and set AWS env vars and --to <recipient>');
  console.log('Env required for real send: AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_REGION (optional), FROM_EMAIL');
  process.exit(0);
}

// Real send path
(async () => {
  try {
    const region = process.env.AWS_REGION || 'eu-west-3';
    const ses = new SESClient({ region, credentials: {
      accessKeyId: process.env.AWS_ACCESS_KEY_ID,
      secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY
    }});

    const source = process.env.FROM_EMAIL || process.env.AWS_SES_FROM;
    if (!source) throw new Error('Set FROM_EMAIL or AWS_SES_FROM env var to a verified sender');

    const params = {
      Source: source,
      Destination: { ToAddresses: [toEmail] },
      Message: {
        Subject: { Data: sampleData.subject || 'Test email', Charset: 'UTF-8' },
        Body: { Html: { Data: finalHtml, Charset: 'UTF-8' }, Text: { Data: sampleData.textFallback || '', Charset: 'UTF-8' } }
      }
    };

    const cmd = new SendEmailCommand(params);
    const res = await ses.send(cmd);
    console.log('SES send response:', res);
  } catch (err) {
    console.error('Error sending via SES:', err);
    process.exit(1);
  }
})();