/*
linphone
Copyright (C) 2017 Belledonne Communications SARL

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#include "linphone/utils/utils.h"

#include "private.h"
#include "platform-helpers.h"

#ifdef __ANDROID__

#include <jni.h>

LINPHONE_BEGIN_NAMESPACE

class AndroidPlatformHelpers : public PlatformHelpers {
public:
	AndroidPlatformHelpers (LinphoneCore *lc, void *system_context);
	virtual void setDnsServers ();
	virtual void acquireWifiLock ();
	virtual void releaseWifiLock ();
	virtual void acquireMcastLock ();
	virtual void releaseMcastLock ();
	virtual void acquireCpuLock ();
	virtual void releaseCpuLock ();
	virtual std::string getDataPath ();
	virtual std::string getConfigPath ();
	~AndroidPlatformHelpers ();
private:
	int callVoidMethod (jmethodID id);
	static jmethodID getMethodId (JNIEnv *env, jclass klass, const char *method, const char *signature);
	jobject mJavaHelper;
	jmethodID mWifiLockAcquireId;
	jmethodID mWifiLockReleaseId;
	jmethodID mMcastLockAcquireId;
	jmethodID mMcastLockReleaseId;
	jmethodID mCpuLockAcquireId;
	jmethodID mCpuLockReleaseId;
	jmethodID mGetDnsServersId;
	jmethodID mGetPowerManagerId;
	jmethodID mGetDataPathId;
	jmethodID mGetConfigPathId;

};

static const char* GetStringUTFChars (JNIEnv* env, jstring string) {
		const char *cstring = string ? env->GetStringUTFChars(string, NULL) : NULL;
		return cstring;
}

static void ReleaseStringUTFChars (JNIEnv* env, jstring string, const char *cstring) {
		if (string) env->ReleaseStringUTFChars(string, cstring);
}

jmethodID AndroidPlatformHelpers::getMethodId (JNIEnv *env, jclass klass, const char *method, const char *signature) {
	jmethodID id = env->GetMethodID(klass, method, signature);
	if (id == 0) {
		ms_fatal("Could not find java method '%s %s'", method, signature);
	}
	return id;
}

AndroidPlatformHelpers::AndroidPlatformHelpers (LinphoneCore *lc, void *system_context) : PlatformHelpers(lc) {
	JNIEnv *env=ms_get_jni_env();
	jclass klass = env->FindClass("org/linphone/core/tools/AndroidPlatformHelper");
	if (!klass) {
		ms_fatal("Could not find java AndroidPlatformHelper class");
		return;
	}
	jmethodID ctor = env->GetMethodID(klass,"<init>", "(Ljava/lang/Object;)V");
	mJavaHelper = env->NewObject(klass, ctor, (jobject)system_context);
	if (!mJavaHelper) {
		ms_error("Could not instanciate AndroidPlatformHelper object.");
		return;
	}
	mJavaHelper = (jobject) env->NewGlobalRef(mJavaHelper);

	mWifiLockAcquireId = getMethodId(env, klass, "acquireWifiLock", "()V");
	mWifiLockReleaseId = getMethodId(env, klass, "releaseWifiLock", "()V");
	mMcastLockAcquireId = getMethodId(env, klass, "acquireMcastLock", "()V");
	mMcastLockReleaseId = getMethodId(env, klass, "releaseMcastLock", "()V");
	mCpuLockAcquireId = getMethodId(env, klass, "acquireCpuLock", "()V");
	mCpuLockReleaseId = getMethodId(env, klass, "releaseCpuLock", "()V");
	mGetDnsServersId = getMethodId(env, klass, "getDnsServers", "()[Ljava/lang/String;");
	mGetPowerManagerId = getMethodId(env, klass, "getPowerManager", "()Ljava/lang/Object;");
	mGetDataPathId = getMethodId(env, klass, "getDataPath", "()Ljava/lang/String;");
	mGetConfigPathId = getMethodId(env, klass, "getConfigPath", "()Ljava/lang/String;");

	jobject pm = env->CallObjectMethod(mJavaHelper,mGetPowerManagerId);
	belle_sip_wake_lock_init(env, pm);

	ms_message("AndroidPlatformHelpers is fully initialised");
}

AndroidPlatformHelpers::~AndroidPlatformHelpers () {
	if (mJavaHelper) {
		JNIEnv *env = ms_get_jni_env();
		belle_sip_wake_lock_uninit(env);
		env->DeleteGlobalRef(mJavaHelper);
		mJavaHelper = NULL;
	}
}


void AndroidPlatformHelpers::setDnsServers () {
	if (!mJavaHelper) return;
	JNIEnv *env=ms_get_jni_env();
	if (env && mJavaHelper) {
		jobjectArray jservers = (jobjectArray)env->CallObjectMethod(mJavaHelper,mGetDnsServersId);
		bctbx_list_t *l = NULL;
		if (env->ExceptionCheck()) {
			env->ExceptionClear();
			ms_error("AndroidPlatformHelpers::setDnsServers() exception");
			return;
		}
		if (jservers != NULL) {
			int count = env->GetArrayLength(jservers);

			for (int i=0; i < count; i++) {
				jstring jserver = (jstring) env->GetObjectArrayElement(jservers, i);
				const char *str = env->GetStringUTFChars(jserver, NULL);
				if (str) {
					l = bctbx_list_append(l, ms_strdup(str));
					env->ReleaseStringUTFChars(jserver, str);
				}
			}
		}
		linphone_core_set_dns_servers(mCore, l);
		bctbx_list_free_with_data(l, ms_free);
	}
}

void AndroidPlatformHelpers::acquireWifiLock () {
	callVoidMethod(mWifiLockAcquireId);
}

void AndroidPlatformHelpers::releaseWifiLock () {
	callVoidMethod(mWifiLockReleaseId);
}

void AndroidPlatformHelpers::acquireMcastLock () {
	callVoidMethod(mMcastLockAcquireId);
}

void AndroidPlatformHelpers::releaseMcastLock () {
	callVoidMethod(mMcastLockReleaseId);
}

void AndroidPlatformHelpers::acquireCpuLock () {
	callVoidMethod(mCpuLockAcquireId);
}

void AndroidPlatformHelpers::releaseCpuLock () {
	callVoidMethod(mCpuLockReleaseId);
}

std::string AndroidPlatformHelpers::getDataPath () {
	JNIEnv *env = ms_get_jni_env();
	jstring jdata_path = (jstring)env->CallObjectMethod(mJavaHelper,mGetDataPathId);
	const char *data_path = GetStringUTFChars(env, jdata_path);
	std::string dataPath = data_path;
	ReleaseStringUTFChars(env, jdata_path, data_path);
	return dataPath;
}

std::string AndroidPlatformHelpers::getConfigPath () {
	JNIEnv *env = ms_get_jni_env();
	jstring jconfig_path = (jstring)env->CallObjectMethod(mJavaHelper,mGetConfigPathId);
	const char *config_path = GetStringUTFChars(env, jconfig_path);
	std::string configPath = config_path;
	ReleaseStringUTFChars(env, jconfig_path, config_path);
	return configPath;
}

int AndroidPlatformHelpers::callVoidMethod (jmethodID id) {
	JNIEnv *env=ms_get_jni_env();
	if (env && mJavaHelper) {
		env->CallVoidMethod(mJavaHelper,id);
		if (env->ExceptionCheck()) {
			env->ExceptionClear();
			return -1;
		} else
			return 0;
	} else
		return -1;
}

PlatformHelpers *createAndroidPlatformHelpers (LinphoneCore *lc, void *system_context) {
	return new AndroidPlatformHelpers(lc, system_context);
}

LINPHONE_END_NAMESPACE

#endif