var OSUtil = Packages.me.hatter.tools.commons.os.OSUtil;

var getJavaHomeFromJdks = (version) => {
    var jdksPath = $$.file('~/.jssp/jdks');
    if (!(jdksPath.exists() && jdksPath.isDirectory())) {
        return null;
    }
    var jdkVersions = $ARRAY(jdksPath.listFiles()).filter((p) => {
        return p.isDirectory();
    }).map((p) => {
        var jdkVersion = p.getName();
        if (jdkVersion.startsWith('jdk-')) {
            jdkVersion = jdkVersion.substring('jdk-'.length);
        } else if (jdkVersion.startsWith('jdk')) {
            jdkVersion = jdkVersion.substring('jdk'.length);
        }
        return [jdkVersion, p.getAbsolutePath()];
    }).sort((a, b) => {
        return b[0] - a[0];
    });
    for (var i = 0; i < jdkVersions.length; i++) {
        if (jdkVersions[i][0].startsWith(version)) {
            return jdkVersions[i][1];
        }
    }
    return null;
};

var getJavaHomeFromBuildConfig = (version) => {
    var buildConfigRFile = __.rfile.from('~/.jssp/config/buildconfig.json');
    if (buildConfigRFile.notExists()) {
        return null;
    }
    var buildConfigJSON = JSON.parse(buildConfigRFile.string());
    if (buildConfigJSON['java'] && buildConfigJSON['java']['versions']) {
        var versions = buildConfigJSON['java']['versions'];
        for (var i = 0; i < versions.length; i++) {
            if (versions[i].startsWith(version)) {
                return buildConfigJSON['java'][versions[i]]['home'];
            }
        }
    }
    return null;
}

var getJavaHome = (version) => {
    if ((version == null) || ($STR(version) == '')) { return null; }
    if (OSUtil.isMacOS()) {
        var jversions = $$.shell().commands('/usr/libexec/java_home', '-version', version).start();
        if (jversions[1] && $STR(jversions[1].toString()).contains('Unable to find any JVMs matching version')) {
            return null;
        }
        return jversions[0].toString().trim();
    } else {
        var javaHomeFromJdks = getJavaHomeFromJdks(version);
        if (javaHomeFromJdks != null) {
            return javaHomeFromJdks;
        }
        var javaHomeFromBuildConfig = getJavaHomeFromBuildConfig(version);
        return javaHomeFromBuildConfig;
    }
};

if (typeof exports == 'object') {
    exports.getJavaHome = getJavaHome;
}