/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#include <jni.h>

#include <utils/EntityManager.h>

using namespace utils;

static_assert(sizeof(jint) == sizeof(Entity), "jint and Entity are not compatible!!");

extern "C" JNIEXPORT jlong JNICALL
Java_com_google_android_filament_EntityManager_nGetEntityManager(JNIEnv*, jclass) {
    return (jlong) &EntityManager::get();
}

extern "C" JNIEXPORT void JNICALL
Java_com_google_android_filament_EntityManager_nCreateArray(JNIEnv* env, jclass,
        jlong nativeEntityManager, jint n, jintArray entities_) {
    EntityManager* em = (EntityManager *) nativeEntityManager;
    jint* entities = env->GetIntArrayElements(entities_, NULL);

    // This is very very gross, we just pretend Entity is just like an jint
    // (which it is), but still.
    em->create((size_t) n, reinterpret_cast<Entity *>(entities));

    env->ReleaseIntArrayElements(entities_, entities, JNI_ABORT);
}

extern "C" JNIEXPORT jint JNICALL
Java_com_google_android_filament_EntityManager_nCreate(JNIEnv*, jclass,
        jlong nativeEntityManager) {
    EntityManager* em = (EntityManager *) nativeEntityManager;
    return em->create().getId();
}

extern "C" JNIEXPORT void JNICALL
Java_com_google_android_filament_EntityManager_nDestroyArray(JNIEnv* env, jclass,
        jlong nativeEntityManager, jint n, jintArray entities_) {
    EntityManager* em = (EntityManager *) nativeEntityManager;
    jint* entities = env->GetIntArrayElements(entities_, NULL);

    // This is very very gross, we just pretend Entity is just like an
    // jint (which it is), but still.
    em->destroy((size_t) n, reinterpret_cast<Entity*>(entities));

    env->ReleaseIntArrayElements(entities_, entities, JNI_ABORT);
}

extern "C" JNIEXPORT void JNICALL
Java_com_google_android_filament_EntityManager_nDestroy(JNIEnv*, jclass,
        jlong nativeEntityManager, jint entity_) {
    EntityManager *em = (EntityManager *) nativeEntityManager;
    Entity& entity = *reinterpret_cast<Entity*>(&entity_);
    em->destroy(entity);
}

extern "C" JNIEXPORT jboolean JNICALL
Java_com_google_android_filament_EntityManager_nIsAlive(JNIEnv*, jclass,
        jlong nativeEntityManager, jint entity_) {
    EntityManager *em = (EntityManager *) nativeEntityManager;
    Entity& entity = *reinterpret_cast<Entity*>(&entity_);
    return (jboolean) em->isAlive(entity);
}