src/app/api/render/route.ts

import { NextRequest, NextResponse } from 'next/server';
import type { ApiResponse, RenderRequest, RenderData } from '@/types/api';

export async function POST(req: NextRequest): Promise<NextResponse<ApiResponse<RenderData>>> {
  try {
    const body: RenderRequest = await req.json();

    if (!body.slides || body.slides.length === 0) {
      return NextResponse.json({ success: false, error: 'No slides to render' }, { status: 400 });
    }

    // Phase 5 stub — real Puppeteer rendering implemented in Phase 3
    const stubImages = body.slides.map((_, i) =>
      `https://placehold.co/1080x1080/3b82f6/ffffff?text=Slide+${i + 1}`
    );

    return NextResponse.json({
      success: true,
      data: { images: stubImages, zipUrl: '#' },
    });
  } catch (err) {
    console.error('[render] failed:', err);
    return NextResponse.json({ success: false, error: 'Something went wrong — please try again' }, { status: 500 });
  }
}