<%
// Returns the version number of the current version of Gecko for the specified
// branch (or release if none specified). The version number is taken from the
// code for the web site (the same file used by SUMO and by the download pages).
//
// Parameters:
//
//  $0  Channel to get the version of:
//          release
//          beta
//          aurora
//          central (or nightly)
//          esr
//
// If channel isn't provided, "release" is assumed.

var channel = $0 || "release";

// Generate the string to search for to find the line with the version number
// for the version we're looking for

channel = channel.toLowerCase();

var versionID;

switch(channel) {
    case 'release':
        versionID = "LATEST_FIREFOX_VERSION";
        break;
    case 'beta':
    case 'aurora':
        versionID = "LATEST_FIREFOX_DEVEL_VERSION";
        break;
    case 'nightly':
    case 'central':
        versionID = "FIREFOX_NIGHTLY";
        break;
    case 'esr':
        versionID = "FIREFOX_ESR";
        break;
    default:
        return 'undefined';
}

// The URL to pull from

var url = "https://product-details.mozilla.org/1.0/firefox_versions.json";

// Fetch the versions JSON file from MXR.

var versionInfo = await MDN.fetchJSONResource(url);

// We now have a JSON object with the version information, so peel out the value we need

var version = versionInfo[versionID];

// Finally, remove the cruft at the end; we don't need beta numbers etc.

for (var i=0; i<version.length; i++) {
    var c = version.charAt(i).toLowerCase();
    if (c != '.' && (c < '0' || c > '9')) {
        version = version.slice(0, i);
        break;
    }
}

// For version numbers ending in ".0", remove that. We don't care. :)

if (version.slice(-2) == ".0") {
    version = version.slice(0, -2);
}

%>
<%-version%>