/**
 * Returns current storm status — polled by the frontend every 60 seconds.
 * Storm is considered "active" if an event was received within the last 24 hours.
 *
 * Requires Vercel KV to be connected for auto-trigger to work.
 * Without KV: always returns stormActive: false (manual Storm Mode still works).
 *
 * Response: { stormActive: boolean, event: StormEvent | null, checkedAt: number }
 */

const STORM_ACTIVE_WINDOW_MS = 24 * 60 * 60 * 1000;

export default async function handler(req, res) {
    res.setHeader('Cache-Control', 'no-store');

    if (req.method !== 'GET') {
        return res.status(405).json({ error: 'Method not allowed' });
    }

    try {
        const { kv } = await import('@vercel/kv');
        const event = await kv.get('lastStormEvent');

        const stormActive = !!event &&
            typeof event.receivedAt === 'number' &&
            (Date.now() - event.receivedAt) < STORM_ACTIVE_WINDOW_MS;

        return res.status(200).json({
            stormActive,
            event: stormActive ? event : null,
            checkedAt: Date.now(),
        });
    } catch {
        // KV not configured — storm auto-trigger unavailable, manual toggle still works
        return res.status(200).json({
            stormActive: false,
            event: null,
            checkedAt: Date.now(),
        });
    }
}