import { cancelQueuedLeg, performAction } from '@/lib/game/actions';

// POST /api/planes/:planeId/queue/cancel (v0.25.0, ISS-043) — body { index: number }.
// Removes a NOT-yet-started leg from the plane's queue by index; only queued legs
// are cancellable, the active in-flight leg is never affected. 400 missing/
// non-integer index, unknown fields, or an index outside [0, queue.length); 404
// unknown plane id. On success returns the full state snapshot (plane.queue updated).

export async function POST(req: Request, ctx: { params: Promise<{ planeId: string }> }) {
  const { planeId } = await ctx.params;

  let body: unknown;
  try {
    const text = await req.text();
    body = text ? JSON.parse(text) : {};
  } catch {
    return Response.json({ error: 'invalid JSON body' }, { status: 400 });
  }
  if (typeof body !== 'object' || body === null || Array.isArray(body)) {
    return Response.json({ error: 'body must be a JSON object' }, { status: 400 });
  }
  const input = body as Record<string, unknown>;
  for (const key of Object.keys(input)) {
    if (key !== 'index') {
      return Response.json({ error: `unknown field "${key}"` }, { status: 400 });
    }
  }
  if (!Number.isInteger(input.index)) {
    return Response.json({ error: 'index must be an integer' }, { status: 400 });
  }

  const index = input.index as number;
  return performAction((inst) => cancelQueuedLeg(inst, planeId, index));
}