export {GetArrayBuffer, GetFileInfo, GetCoverURL, AudioMimeType}

// Also a new draft API: blob.arrayBuffer()
async function GetArrayBuffer(blobObject) {
    return await new Promise(resolve => {
        const reader = new FileReader();
        reader.onload = (e) => {
            resolve(e.target.result);
        };
        reader.readAsArrayBuffer(blobObject);
    });
}

const AudioMimeType = {
    mp3: "audio/mpeg",
    flac: "audio/flac",
    m4a: "audio/mp4",
    ogg: "audio/ogg"
};

function GetFileInfo(artist, title, filenameNoExt) {
    let newArtist = "", newTitle = "";
    let filenameArray = filenameNoExt.split("-");
    if (filenameArray.length > 1) {
        newArtist = filenameArray[0].trim();
        newTitle = filenameArray[1].trim();
    } else if (filenameArray.length === 1) {
        newTitle = filenameArray[0].trim();
    }

    if (typeof artist == "string" && artist !== "") {
        newArtist = artist;
    }
    if (typeof title == "string" && title !== "") {
        newTitle = title;
    }
    return {artist: newArtist, title: newTitle};
}

/**
 * @return {string}
 */
function GetCoverURL(metadata) {
    let pic_url = "";
    if (metadata.common.picture !== undefined && metadata.common.picture.length > 0) {
        let pic = new Blob([metadata.common.picture[0].data], {type: metadata.common.picture[0].format});
        pic_url = URL.createObjectURL(pic);
    }
    return pic_url;
}