// Thin wrapper around the Radio-Browser community API.
// Docs: https://api.radio-browser.info/

const SERVERS = [
    'https://de1.api.radio-browser.info',
    'https://nl1.api.radio-browser.info',
    'https://at1.api.radio-browser.info'
];

let activeServer = SERVERS[0];

async function rb(path, params) {
    const url = new URL(path, activeServer);
    if (params) for (const [k, v] of Object.entries(params)) {
        if (v != null) url.searchParams.set(k, String(v));
    }
    const res = await fetch(url, { headers: { 'User-Agent': 'OnlineRadioExplorer/0.1' } });
    if (!res.ok) throw new Error(`Radio-Browser ${res.status}`);
    return res.json();
}

export async function search({ name, country, tag, limit = 30 }) {
    const list = await rb('/json/stations/search', {
        name, country, tag, limit, hidebroken: true, order: 'votes', reverse: true
    });
    return list.map(toCanonical);
}

export async function byUuid(uuid) {
    const list = await rb('/json/stations/byuuid', { uuids: uuid });
    return list[0] ? toCanonical(list[0]) : null;
}

function detectFormat(codec, url) {
    const c = (codec || '').toLowerCase();
    if (c.includes('mp3')) return 'mp3';
    if (c.includes('aac')) return 'aac';
    if (c.includes('ogg') || c.includes('vorbis') || c.includes('opus')) return 'ogg';
    if (url?.endsWith('.m3u8')) return 'hls';
    if (url?.endsWith('.m3u')) return 'm3u';
    if (url?.endsWith('.pls')) return 'pls';
    return 'unknown';
}

function toCanonical(s) {
    return {
        uuid: s.stationuuid || undefined,
        name: s.name,
        slug: `rb-${s.stationuuid}`,
        homepage: s.homepage || null,
        country: s.countrycode || s.country || null,
        genres: (s.tags || '').split(',').map((t) => t.trim()).filter(Boolean),
        description: null,
        image_url: s.favicon || null,
        source: 'radiobrowser',
        source_ref: s.stationuuid,
        streams: [{
            url: s.url_resolved || s.url,
            format: detectFormat(s.codec, s.url_resolved || s.url),
            bitrate: s.bitrate || null,
            label: s.codec ? `${s.codec} ${s.bitrate || ''}`.trim() : null,
            priority: 0
        }]
    };
}