import type { Handle } from '@sveltejs/kit';
import { migrate } from '$lib/server/db/migrate.js';
import { startWorker } from '$lib/server/pipeline/worker.js';
import { interruptDeployments } from '$lib/server/provisioning/history.js';
import { authenticationHandle } from '$lib/server/auth/guard.js';
import { invalidateFleet } from '$lib/server/pipeline/bus.js';
import { startPerformanceMonitor } from '$lib/server/performance.js';
import { withOperationSource } from '$lib/server/hosts/operation-context.js';
import { withHostRequestContext } from '$lib/server/hosts/request-context.js';

let booted = false;
function boot(): void {
    if (booted) return;
    booted = true;
    migrate();
    interruptDeployments();
    startWorker();
    startPerformanceMonitor();
}

// SvelteKit calls handle() for every request; using the first request as the
// boot trigger keeps the whole app single-process without needing an
// out-of-band init hook.
export const handle: Handle = async (input) => {
    boot();
    const started = performance.now();
    const response = await withHostRequestContext(() => withOperationSource(`${input.event.request.method} ${input.event.route.id ?? 'Web request'}`,
        () => authenticationHandle(input)));
    const elapsed = performance.now() - started;
    response.headers.append('Server-Timing', `app;dur=${elapsed.toFixed(1)}`);
    if (process.env.EC_PERF_LOG === 'true' && elapsed > 250 && !input.event.route.id?.startsWith('/api/agent/')) {
        console.info('[request]', { route: input.event.route.id, method: input.event.request.method, status: response.status, elapsedMs: Math.round(elapsed) });
    }
    if (input.event.locals.user && !['GET','HEAD','OPTIONS'].includes(input.event.request.method) && response.status < 400) invalidateFleet();
    return response;
};