//
// Created by #Suyghur, on 2021/10/15.
//

#include "include/yylog.h"
#include "include/tool_kit.h"

jbyteArray ToolKit::GetJbyteArray(JNIEnv *Env, const char *src) {
    return nullptr;
}

jstring ToolKit::GetJString(JNIEnv *env, const char *src) {
    jclass clz = env->FindClass("java/lang/String");
    jmethodID methodID = env->GetMethodID(clz, "<init>", "([BLjava/lang/String;)V");
    jstring encoding = env->NewStringUTF("utf-8");

    auto length = static_cast<jsize>(strlen(src));
    jbyteArray bytes = env->NewByteArray(length);
    env->SetByteArrayRegion(bytes, 0, length, (jbyte *) src);
    auto result = (jstring) env->NewObject(clz, methodID, bytes, encoding);

    env->DeleteLocalRef(clz);
    env->DeleteLocalRef(encoding);
    env->DeleteLocalRef(bytes);

    return result;
}

std::string ToolKit::JString2String(JNIEnv *env, jstring src) {
    if (env == nullptr || src == nullptr) {
        LOGE("jstring to string has some error");
        return "";
    }
    char *tmp_ptr = nullptr;
    jclass clz = env->FindClass("java/lang/String");
    jstring encode_mode = env->NewStringUTF("UTF-8");
    jmethodID mid = env->GetMethodID(clz, "getBytes", "(Ljava/lang/String;)[B");
    auto byte_array = (jbyteArray) (env->CallObjectMethod(src, mid, encode_mode));
    jsize len = env->GetArrayLength(byte_array);
    if (len == 0) {
        free(tmp_ptr);
        return "";
    }
    jbyte *byte = env->GetByteArrayElements(byte_array, JNI_FALSE);
    if (len > 0) {
        tmp_ptr = (char *) malloc(len + 1);
        memcpy(tmp_ptr, byte, len);
        tmp_ptr[len] = 0;
    }
    env->ReleaseByteArrayElements(byte_array, byte, JNI_FALSE);
    std::string result(tmp_ptr);
    free(tmp_ptr);
    env->DeleteLocalRef(clz);
    env->DeleteLocalRef(encode_mode);
    env->DeleteLocalRef(byte_array);
    return result;
}