const rateLimitMap = new Map();

function checkRateLimit(userId, limit = 5, windowMs = 1000) {
    const now = Date.now();
    const key = userId;
    const entry = rateLimitMap.get(key);

    if (!entry || now > entry.resetTime) {
        rateLimitMap.set(key, { count: 1, resetTime: now + windowMs });
        return true;
    }

    if (entry.count >= limit) {
        return false;
    }

    entry.count++;
    return true;
}

import { getSubsiteByHost } from '../../utils/subsites.js';

export async function GET({ request }) {
    const host = request.headers.get('host');
    const subsite = getSubsiteByHost(host);

    if (!subsite || subsite.short !== 'req') {
        return new Response('Not found', { status: 404 });
    }

    let userId = request.headers.get('cookie')?.split(';').find(c => c.trim().startsWith('nonce='))?.split('=')[1];
    const hadCookie = !!userId;
    if (!userId) {
        userId = crypto.randomUUID();
    }

    if (!checkRateLimit(userId)) {
        const response = new Response(JSON.stringify({ error: 'Rate limit exceeded' }), { status: 429, headers: { 'Content-Type': 'application/json' } });
        if (!hadCookie) {
            response.headers.set('Set-Cookie', `nonce=${userId}; HttpOnly; Path=/; Max-Age=31536000`);
        }
        return response;
    }

    const TMDB_API_KEY = import.meta.env.TMDB_API_KEY;

    if (!TMDB_API_KEY) {
        console.error('TMDB_API_KEY not set');
        const response = new Response(JSON.stringify([]), { status: 500, headers: { 'Content-Type': 'application/json' } });
        if (!hadCookie) {
            response.headers.set('Set-Cookie', `nonce=${userId}; HttpOnly; Path=/; Max-Age=31536000`);
        }
        return response;
    }

    const url = new URL(request.url);
    const q = url.searchParams.get('q');

    if (!q || typeof q !== 'string' || !q.trim()) {
        const response = new Response(JSON.stringify([]), { status: 200, headers: { 'Content-Type': 'application/json' } });
        if (!hadCookie) {
            response.headers.set('Set-Cookie', `nonce=${userId}; HttpOnly; Path=/; Max-Age=31536000`);
        }
        return response;
    }

    if (q.length > 100) {
        const response = new Response(JSON.stringify([]), { status: 200, headers: { 'Content-Type': 'application/json' } });
        if (!hadCookie) {
            response.headers.set('Set-Cookie', `nonce=${userId}; HttpOnly; Path=/; Max-Age=31536000`);
        }
        return response;
    }

    try {
        const apiResponse = await fetch(`https://api.themoviedb.org/3/search/multi?api_key=${TMDB_API_KEY}&query=${encodeURIComponent(q)}`);
        if (!apiResponse.ok) {
            throw new Error(`TMDB API error: ${apiResponse.status}`);
        }
        const data = await apiResponse.json();
        const seen = new Set();
        const filtered = data.results
            .filter(item => {
                if (item.media_type !== 'movie' && item.media_type !== 'tv') return false;
                const key = `${item.media_type}-${item.title || item.name}-${item.release_date?.split('-')[0] || item.first_air_date?.split('-')[0] || ''}`;
                if (seen.has(key)) return false;
                seen.add(key);
                return true;
            })
            .slice(0, 10) // Limit to 10 suggestions
            .map(item => ({
                label: item.title || item.name,
                value: item.title || item.name,
                year: item.release_date?.split('-')[0] || item.first_air_date?.split('-')[0],
                mediaType: item.media_type,
                overview: item.overview,
                poster_path: item.poster_path,
            }));
        const response = new Response(JSON.stringify(filtered), { headers: { 'Content-Type': 'application/json' } });
        if (!hadCookie) {
            response.headers.set('Set-Cookie', `nonce=${userId}; HttpOnly; Path=/; Max-Age=31536000`);
        }
        return response;
    } catch (error) {
        console.error('Error fetching suggestions:', error);
        const response = new Response(JSON.stringify([]), { status: 500, headers: { 'Content-Type': 'application/json' } });
        if (!hadCookie) {
            response.headers.set('Set-Cookie', `nonce=${userId}; HttpOnly; Path=/; Max-Age=31536000`);
        }
        return response;
    }
}