/* -*- Mode: c++; c-basic-offset: 2; tab-width: 20; indent-tabs-mode: nil; -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef AndroidBridge_h__
#define AndroidBridge_h__

#include <unistd.h>  // for gettid

#include "nsCOMPtr.h"

#include "mozilla/jni/Refs.h"

#include "nsIMutableArray.h"
#include "nsIMIMEInfo.h"

#include "nsIGeckoViewBridge.h"

#include "mozilla/jni/Utils.h"

// Some debug #defines
// #define DEBUG_ANDROID_EVENTS
// #define DEBUG_ANDROID_WIDGET

namespace mozilla {

class AutoLocalJNIFrame;

namespace hal {
class BatteryInformation;
class NetworkInformation;
}  // namespace hal

class AndroidBridge final {
 public:
  static bool IsJavaUiThread() {
    return mozilla::jni::GetUIThreadId() == gettid();
  }

  static void ConstructBridge();
  static void DeconstructBridge();

  static AndroidBridge* Bridge() { return sBridge; }

  void Vibrate(const nsTArray<uint32_t>& aPattern);

  void GetIconForExtension(const nsACString& aFileExt, uint32_t aIconSize,
                           uint8_t* const aBuf);

  // Returns a global reference to the Context for Fennec's Activity. The
  // caller is responsible for ensuring this doesn't leak by calling
  // DeleteGlobalRef() when the context is no longer needed.
  jobject GetGlobalContextRef(void);

  void GetCurrentBatteryInformation(hal::BatteryInformation* aBatteryInfo);

  void GetCurrentNetworkInformation(hal::NetworkInformation* aNetworkInfo);

  nsresult GetProxyForURI(const nsACString& aSpec, const nsACString& aScheme,
                          const nsACString& aHost, const int32_t aPort,
                          nsACString& aResult);

  bool PumpMessageLoop();

  // Utility methods.
  static jfieldID GetFieldID(JNIEnv* env, jclass jClass, const char* fieldName,
                             const char* fieldType);
  static jfieldID GetStaticFieldID(JNIEnv* env, jclass jClass,
                                   const char* fieldName,
                                   const char* fieldType);
  static jmethodID GetMethodID(JNIEnv* env, jclass jClass,
                               const char* methodName, const char* methodType);
  static jmethodID GetStaticMethodID(JNIEnv* env, jclass jClass,
                                     const char* methodName,
                                     const char* methodType);

 protected:
  static AndroidBridge* sBridge;

  AndroidBridge();
  ~AndroidBridge();

  jni::Object::GlobalRef mMessageQueue;
  jfieldID mMessageQueueMessages;
  jmethodID mMessageQueueNext;
};

class AutoJNIClass {
 private:
  JNIEnv* const mEnv;
  const jclass mClass;

 public:
  AutoJNIClass(JNIEnv* jEnv, const char* name)
      : mEnv(jEnv), mClass(jni::GetClassRef(jEnv, name)) {}

  ~AutoJNIClass() { mEnv->DeleteLocalRef(mClass); }

  jclass getRawRef() const { return mClass; }

  jclass getGlobalRef() const {
    return static_cast<jclass>(mEnv->NewGlobalRef(mClass));
  }

  jfieldID getField(const char* name, const char* type) const {
    return AndroidBridge::GetFieldID(mEnv, mClass, name, type);
  }

  jfieldID getStaticField(const char* name, const char* type) const {
    return AndroidBridge::GetStaticFieldID(mEnv, mClass, name, type);
  }

  jmethodID getMethod(const char* name, const char* type) const {
    return AndroidBridge::GetMethodID(mEnv, mClass, name, type);
  }

  jmethodID getStaticMethod(const char* name, const char* type) const {
    return AndroidBridge::GetStaticMethodID(mEnv, mClass, name, type);
  }
};

class AutoJObject {
 public:
  explicit AutoJObject(JNIEnv* aJNIEnv = nullptr) : mObject(nullptr) {
    mJNIEnv = aJNIEnv ? aJNIEnv : jni::GetGeckoThreadEnv();
  }

  AutoJObject(JNIEnv* aJNIEnv, jobject aObject) {
    mJNIEnv = aJNIEnv ? aJNIEnv : jni::GetGeckoThreadEnv();
    mObject = aObject;
  }

  ~AutoJObject() {
    if (mObject) mJNIEnv->DeleteLocalRef(mObject);
  }

  jobject operator=(jobject aObject) {
    if (mObject) {
      mJNIEnv->DeleteLocalRef(mObject);
    }
    return mObject = aObject;
  }

  operator jobject() { return mObject; }

 private:
  JNIEnv* mJNIEnv;
  jobject mObject;
};

class AutoLocalJNIFrame {
 public:
  explicit AutoLocalJNIFrame(int nEntries = 15)
      : mEntries(nEntries),
        mJNIEnv(jni::GetGeckoThreadEnv()),
        mHasFrameBeenPushed(false) {
    MOZ_ASSERT(mJNIEnv);
    Push();
  }

  explicit AutoLocalJNIFrame(JNIEnv* aJNIEnv, int nEntries = 15)
      : mEntries(nEntries),
        mJNIEnv(aJNIEnv ? aJNIEnv : jni::GetGeckoThreadEnv()),
        mHasFrameBeenPushed(false) {
    MOZ_ASSERT(mJNIEnv);
    Push();
  }

  ~AutoLocalJNIFrame() {
    if (mHasFrameBeenPushed) {
      Pop();
    }
  }

  JNIEnv* GetEnv() { return mJNIEnv; }

  bool CheckForException() {
    if (mJNIEnv->ExceptionCheck()) {
      MOZ_CATCH_JNI_EXCEPTION(mJNIEnv);
      return true;
    }
    return false;
  }

  // Note! Calling Purge makes all previous local refs created in
  // the AutoLocalJNIFrame's scope INVALID; be sure that you locked down
  // any local refs that you need to keep around in global refs!
  void Purge() {
    Pop();
    Push();
  }

  template <typename ReturnType = jobject>
  ReturnType Pop(ReturnType aResult = nullptr) {
    MOZ_ASSERT(mHasFrameBeenPushed);
    mHasFrameBeenPushed = false;
    return static_cast<ReturnType>(
        mJNIEnv->PopLocalFrame(static_cast<jobject>(aResult)));
  }

 private:
  void Push() {
    MOZ_ASSERT(!mHasFrameBeenPushed);
    // Make sure there is enough space to store a local ref to the
    // exception.  I am not completely sure this is needed, but does
    // not hurt.
    if (mJNIEnv->PushLocalFrame(mEntries + 1) != 0) {
      CheckForException();
      return;
    }
    mHasFrameBeenPushed = true;
  }

  const int mEntries;
  JNIEnv* const mJNIEnv;
  bool mHasFrameBeenPushed;
};

}  // namespace mozilla

#define NS_ANDROIDBRIDGE_CID \
  {0x0FE2321D, 0xEBD9, 0x467D, {0xA7, 0x43, 0x03, 0xA6, 0x8D, 0x40, 0x59, 0x9E}}

class nsAndroidBridge final : public nsIGeckoViewBridge {
 public:
  NS_DECL_ISUPPORTS
  NS_DECL_NSIGECKOVIEWBRIDGE

  NS_FORWARD_SAFE_NSIGECKOVIEWEVENTDISPATCHER(mEventDispatcher)

  nsAndroidBridge();

 private:
  ~nsAndroidBridge();

  nsCOMPtr<nsIGeckoViewEventDispatcher> mEventDispatcher;

 protected:
};

#endif /* AndroidBridge_h__ */