Gishen-Email-Template/app/api/email/[template]/route.ts

import React from 'react';
import { render } from '@react-email/render';
import { NextResponse } from 'next/server';
import { templateMap } from '../../../../emails/registry';
import { resolveLocale } from '../../../../emails/i18n/types';
import type { ShopSummaryPeriod } from '../../../../emails/shop-summary';

export async function GET(
  request: Request,
  context: { params: Promise<{ template: string }> }
) {
  const { template } = await context.params;
  const entry = templateMap[template];

  if (!entry) {
    return NextResponse.json({ error: 'Template not found' }, { status: 404 });
  }

  const { searchParams } = new URL(request.url);
  const locale = resolveLocale(searchParams.get('locale') || undefined);
  const period = (searchParams.get('period') ||
    entry.defaultProps?.period ||
    'weekly') as ShopSummaryPeriod;

  const html = await render(
    React.createElement(entry.component, {
      locale,
      ...(entry.id === 'shop-summary' ? { period } : {}),
      ...entry.defaultProps,
    })
  );

  return new NextResponse(html, {
    headers: {
      'Content-Type': 'text/html; charset=utf-8',
    },
  });
}