(function (root, factory) {
    const service = factory();
    if (typeof module === 'object' && module.exports) module.exports = service;
    if (root) root.LiveChannelProjection = service;
})(typeof globalThis !== 'undefined' ? globalThis : this, function () {
    function mapResponse(response, sources = []) {
        if (!response || !Array.isArray(response.channels)) {
            throw new Error('Invalid live channel projection response');
        }

        const sourceById = new Map(sources.map(source => [String(source.id), source]));
        const favorites = new Set();
        const hiddenItems = new Set();
        const channels = [];

        response.channels.forEach(logicalChannel => {
            if (!logicalChannel || !Array.isArray(logicalChannel.variants)) return;
            logicalChannel.variants.forEach(variant => {
                const source = sourceById.get(String(variant.sourceId));
                const id = String(variant.id);
                const mapped = {
                    ...variant,
                    id,
                    logicalId: logicalChannel.id,
                    logicalFingerprint: logicalChannel.fingerprint || logicalChannel.id,
                    logicalDisplayName: logicalChannel.displayName || logicalChannel.name,
                    streamId: variant.streamId ?? id,
                    tvgId: variant.tvgId ?? variant.epg_channel_id ?? null,
                    tvgLogo: variant.tvgLogo ?? variant.streamIcon ?? variant.stream_icon ?? '',
                    url: variant.url ?? variant.streamUrl ?? variant.stream_url ?? '',
                    groupTitle: variant.groupTitle ?? variant.categoryName ?? variant.categoryId ?? 'Uncategorized',
                    sourceType: variant.sourceType ?? source?.type ?? 'xtream',
                    sourceName: variant.sourceName ?? source?.name ?? ''
                };
                channels.push(mapped);
                const key = `${mapped.sourceId}:${id}`;
                if (variant.isFavorite) favorites.add(key);
                if (variant.isHidden) hiddenItems.add(`channel:${mapped.sourceId}:${mapped.streamId || id}`);
            });
        });

        return { channels, favorites, hiddenItems, projection: response.projection || {} };
    }

    function canUse(response) {
        return Boolean(response && Array.isArray(response.channels) && !response.projection?.stale);
    }

    return { canUse, mapResponse };
});