AI UGC Video Ad Generator: A Flutter and Laravel Case Study in Mobile-First Video Architecture

class RenderJobController extends Controller
{
    public function store(StoreRenderJobRequest $request, CreditService $credits): JsonResponse
    {
        $campaign = Campaign::where('user_id', $request->user()->id)
            ->findOrFail($request->validated('campaign_id'));
        $this->authorize('render', $campaign);

        $key = $request->header('Idempotency-Key');
        abort_if(blank($key), 422, 'Idempotency-Key header is required.');

        $job = DB::transaction(function () use ($request, $campaign, $credits, $key) {
            $existing = RenderJob::where('user_id', $request->user()->id)
                ->where('idempotency_key', $key)
                ->first();
            if ($existing) {
                return $existing;
            }

            $cost = $campaign->estimatedCredits($request->validated('aspect_ratio'));

            $job = RenderJob::create([
                'user_id'         => $request->user()->id,
                'campaign_id'     => $campaign->id,
                'presenter_id'    => $request->validated('presenter_id'),
                'voice_id'        => $request->validated('voice_id'),
                'aspect_ratio'    => $request->validated('aspect_ratio'),
                'idempotency_key' => $key,
                'credit_cost'     => $cost,
                'status'          => RenderStatus::Queued,
            ]);

            $credits->reserve($request->user(), $job, $cost);

            return $job;
        });

        if ($job->wasRecentlyCreated) {
            GenerateVideoAd::dispatch($job->id)->onQueue('avatar')->afterCommit();
        }

        return (new RenderJobResource($job))
            ->response()
            ->setStatusCode($job->wasRecentlyCreated ? 202 : 200);
    }
}