package com.doublesymmetry.trackplayer

/**
 * Whether [uri] points at an HLS playlist, decided purely from its file
 * extension (`.m3u8` / `.m3u`) after stripping any query string or fragment.
 *
 * Used by the preloader to choose between warming the media SEGMENTS via
 * `HlsDownloader` (which parses the playlist and writes every segment, key and
 * init map into the cache) and the shallow manifest-only `CacheWriter`.
 *
 * Detection is extension-only, matching the iOS proxy's path-extension check —
 * so an extensionless or redirecting manifest URL falls back to the
 * manifest-only path. (Unlike the iOS proxy, this offline path does not also
 * sniff the response body for `#EXTM3U`.)
 */
internal fun isHlsUri(uri: String): Boolean {
    val path = uri.substringBefore('#').substringBefore('?')
    val lower = path.lowercase()
    return lower.endsWith(".m3u8") || lower.endsWith(".m3u")
}