import { NextRequest, NextResponse } from 'next/server';
import { getCachedFirm, getKeptRulesFor } from '@/lib/firm-catalog';
import { firmInstruments, instrumentsSource } from '@/lib/instruments';
import { getCredentials } from '@/lib/db';

/** One firm from the cached catalog. Read-only: firms and their account types
 *  are owned by the master dashboard, and there is no local DELETE — a firm
 *  goes away here when it goes away there. */
export async function GET(
    _req: NextRequest,
    { params }: { params: Promise<{ id: string }> }
) {
    const { id } = await params;

    const firm = getCachedFirm(id);
    if (!firm) {
        return NextResponse.json({ error: 'Firm not found' }, { status: 404 });
    }

    const creds = getCredentials(id);
    return NextResponse.json({
        id: firm.id,
        firm: firm.name,
        username: creds?.username ?? '',
        hasCredentials: !!creds,
        instruments: firmInstruments(firm),
        instrumentsSource: instrumentsSource(firm),
        // Same shape as GET /api/firms: each type with its old rule sets' windows.
        accounts: firm.accountTypes.map((a) => ({
            ...a,
            kept: getKeptRulesFor(a.id).map((k) => ({ id: k.id, openedAt: k.openedAt, closedAt: k.closedAt })),
        })),
        catalogUpdatedAt: firm.updatedAt,
    });
}