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

// POST /api/planes/:planeId/refuel (v0.8.0; optional body v0.16.0) — fills a grounded
// plane at the fuel price per added liter and deducts the cost from cash. The body is
// OPTIONAL: no body, {} or {mode:'full'} fill to maxFuel (the original behavior);
// {mode:'forFlight', packageId} adds just enough for that loaded package's destination
// leg. 400 bad body (unknown field, unknown mode, forFlight without packageId); 404
// unknown plane/package id; 409 if the plane is flying, the package isn't loaded on it
// (or is expired), the leg doesn't fit a full tank, or cash is insufficient. On success
// returns the full state snapshot (fuel raised by exactly the added liters).

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 !== 'mode' && key !== 'packageId') {
      return Response.json({ error: `unknown field "${key}"` }, { status: 400 });
    }
  }
  const mode = input.mode ?? 'full';
  if (mode !== 'full' && mode !== 'forFlight') {
    return Response.json({ error: 'mode must be "full" or "forFlight"' }, { status: 400 });
  }
  let packageId: string | undefined;
  if (input.packageId !== undefined) {
    if (typeof input.packageId !== 'string' || input.packageId.length === 0) {
      return Response.json({ error: 'packageId must be a non-empty string' }, { status: 400 });
    }
    packageId = input.packageId;
  }
  if (mode === 'forFlight' && !packageId) {
    return Response.json({ error: 'packageId is required when mode is "forFlight"' }, { status: 400 });
  }

  return performAction((inst) => refuelPlane(inst, planeId, { mode, packageId }));
}