import { NextRequest, NextResponse } from 'next/server';
import { getSetting, setSetting } from '@/lib/db';
import { scheduleBackupPush } from '@/lib/backup-sync';
import { getRequestUserAgent } from '@/lib/request-user-agent';

const VALID_KEYS = ['max_concurrent_accounts', 'tick_interval_seconds', 'master_dashboard_url', 'instance_name', 'trading_hours', 'twocaptcha_api_key', 'twocaptcha_proxy', 'master_backup_token', 'proxy_url'] as const;
type SettingKey = typeof VALID_KEYS[number];

export async function GET() {
    const result: Record<string, string | null> = {};
    for (const key of VALID_KEYS) {
        result[key] = getSetting(key);
    }
    // Read-only on purpose (not in VALID_KEYS): the master issues this uuid,
    // and editing it by hand would detach the instance from its person.
    result.instance_id = getSetting('instance_id');
    // Generated once per instance. Callers cannot rotate an active identity.
    result.user_agent = getRequestUserAgent();
    result.backup_last_push_at = getSetting('backup_last_push_at');
    result.backup_last_error = getSetting('backup_last_error');
    return NextResponse.json(result);
}

export async function PATCH(req: NextRequest) {
    try {
        const body = await req.json() as Partial<Record<SettingKey, string | number>>;

        for (const key of VALID_KEYS) {
            if (key in body) {
                const raw = body[key];
                if (raw === undefined || raw === null) continue;
                setSetting(key, String(raw));
            }
        }

        // The edit should reach the master's backup within seconds, not at the
        // next poll.
        scheduleBackupPush();

        return NextResponse.json({ ok: true });
    } catch (err: any) {
        return NextResponse.json({ error: err?.message ?? 'Failed to save settings' }, { status: 500 });
    }
}