def targetFile = new File("./app/src/main/java/com/smartconfig/Config.java")
def targetFile2 = new File("./app/src/main/assets/test.txt")
def targetFile3 = new File("./gradle.properties")
if (targetFile2.exists()) {
    def bytes = targetFile2.getBytes()
    def original = new String(bytes)
    if(!original.contains("data=")||!original.contains("pageName=")||!original.contains("isUseGson=")){
        throw new RuntimeException("src/main/assets/test.txt文件错失必要的参数!请仔细检查")
    }
    //防止json数据里面存在isUseGson=true这样的字段干扰我们的判断
    def result = original.substring(0,original.indexOf("data="))
    if (result.contains("isUseGson=true")) {
        isUseGson = true
    }
    if (result.contains("isUseGson=false")) {
        isUseGson = false
    }
}

//该接口返回的是文件内容对应的byte[]
def bytes = targetFile.getBytes()
//与上述接口对应，还可以直接使用targetFile.bytes这个属性获取文件内容
def original = new String(bytes)


def useGson = "package com.smartconfig;\n" +
        "\n" +
        "import com.google.gson.Gson;\n" +
        "\n" +
        "public class Config {\n" +
        "    public Object build() {\n" +
        "        return new Gson();\n" +
        "    }\n" +
        "}"

def noUseGson = "package com.smartconfig;\n" +
        "\n" +
        "import com.google.gson.Gson;\n" +
        "\n" +
        "public class Config {\n" +
        "    public Object build() {\n" +
        "       // return new Gson();\n" +
        "        return null;\n" +
        "    }\n" +
        "}"


//修改Config.java类之前判断Config.java是不是最新的代码，如果不是最新的代码就要爆出异常~
if (original != useGson && original != noUseGson) {
    throw new RuntimeException("Config.javay类已经被修改过,需要更新才能编译!请找梁超杰")
}
//这里获取的实际是Java中的BufferedOutputStream
targetFile.withOutputStream { osm ->
    osm.write((isUseGson.toBoolean() ? useGson : noUseGson).getBytes())
}