import { NextRequest, NextResponse } from 'next/server';
import { getCachedCatalog } from '@/lib/firm-catalog';
import {
    ensureMarket, firmInstruments, futuresRootsHere, instrumentStatsFor, instrumentsSource, isFuturesFirm, simulateDraws,
} from '@/lib/instruments';
import { CME_ROOTS } from '@/lib/instrument-specs';

export const dynamic = 'force-dynamic';

/** The leg the overview sizes holds for: $1,000, stopless, one contract. */
const EXAMPLE_LEG = { leg: 1000, stopDollars: Infinity, maxPositionSize: 0 };

/**
 * GET /api/instruments — what each firm trades (the master's lists) and, for
 * futures firms, how the Auto draw sees every instrument right now: a tick
 * of spread, one contract's daily move, the hold of a $1,000 leg, the chance.
 * ?simulate=N adds N draws from the real draw code — no orders.
 */
export async function GET(req: NextRequest) {
    await ensureMarket(CME_ROOTS, 8_000);
    const n = Math.min(100_000, Math.max(0, Math.floor(Number(req.nextUrl.searchParams.get('simulate')) || 0)));
    const firms = getCachedCatalog().map((firm) => {
        const instruments = firmInstruments(firm);
        const futures = isFuturesFirm(firm);
        return {
            id: firm.id,
            name: firm.name,
            platform: firm.platform,
            source: instrumentsSource(firm),
            instruments,
            ...(futures ? { stats: instrumentStatsFor(firm, { ...EXAMPLE_LEG, account: 'a $1,000 leg' }) } : {}),
            ...(futures && n > 0 ? { simulated: simulateDraws(instruments, EXAMPLE_LEG, n) } : {}),
        };
    });
    return NextResponse.json({ roots: futuresRootsHere(), firms });
}