Gradle dynamic build variant modification at compile time

build.gradle

    /*android.variantFilter { variant ->
        println "variant= " + variant.name
        def flavorString = ""
        def flavors = variant.getFlavors()
        for (int i = 0; i < flavors.size(); i++) {
            flavorString += flavors[i].name

            println "flavorName=" + flavorString
        }
        if (flavorString.equalsIgnoreCase("mobile")) {
            
            variant.getDefaultConfig().applicationId "app.zenia"
            variant.getDefaultConfig().applicationIdSuffix ".debug"

            println("appId = " + variant.getDefaultConfig().applicationId + variant.getDefaultConfig().applicationIdSuffix)
        }
    }*/

def renameVariants() {

    android.applicationVariants.all { variant ->
        if (variant.buildType.name == "debug") {
            def flavors = variant.productFlavors
            flavors.each() { flavor ->
                if (flavor.name == "mobile") {
//                    println("\n==== begin buildConfig modification ====")
//                    println "variantName=" + variant.name

//                    println("before:")
//                    println("versionName= " + variant.mergedFlavor.versionName + variant.mergedFlavor.versionNameSuffix)
//                    println("applicationId= " + variant.mergedFlavor.applicationId + variant.mergedFlavor.applicationIdSuffix)

                    variant.mergedFlavor.applicationIdSuffix ".debug"
                    variant.mergedFlavor.versionNameSuffix "-debug"

//                    println("after:")
//                    println("versionName= " + variant.mergedFlavor.versionName + variant.mergedFlavor.versionNameSuffix)
//                    println("applicationId= " + variant.mergedFlavor.applicationId + variant.mergedFlavor.applicationIdSuffix)

//                    println("==== end buildConfig modification ====")
                }
            }
        }

//        def flavors = variant.productFlavors
//        flavors.each() { flavor ->
//            println("\n==== begin buildConfig read ====")
//            println "variantName=" + variant.name
//
//            println("versionName= " + variant.mergedFlavor.versionName + variant.mergedFlavor.versionNameSuffix)
//            println("applicationId= " + variant.mergedFlavor.applicationId + variant.mergedFlavor.applicationIdSuffix)
//
//            println("==== end buildConfig read ====")
//        }
    }
}