/* -*- 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/. */

#include <android/log.h>
#include <dlfcn.h>
#include <math.h>
#include <GLES2/gl2.h>

#include "mozilla/layers/CompositorBridgeChild.h"
#include "mozilla/layers/CompositorBridgeParent.h"

#include "mozilla/Hal.h"
#include "nsXULAppAPI.h"
#include <prthread.h>
#include "AndroidBridge.h"
#include "AndroidBridgeUtilities.h"
#include "nsAlertsUtils.h"
#include "nsAppShell.h"
#include "nsOSHelperAppService.h"
#include "nsWindow.h"
#include "mozilla/Preferences.h"
#include "nsThreadUtils.h"
#include "nsPresContext.h"
#include "nsPIDOMWindow.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Mutex.h"
#include "nsPrintfCString.h"
#include "nsContentUtils.h"

#include "EventDispatcher.h"

#include "mozilla/TimeStamp.h"
#include "WidgetUtils.h"

#include "mozilla/java/EventDispatcherWrappers.h"
#include "mozilla/java/GeckoAppShellWrappers.h"
#include "mozilla/java/GeckoThreadWrappers.h"

using namespace mozilla;

AndroidBridge* AndroidBridge::sBridge = nullptr;
static jobject sGlobalContext = nullptr;

jmethodID AndroidBridge::GetMethodID(JNIEnv* env, jclass jClass,
                                     const char* methodName,
                                     const char* methodType) {
  jmethodID methodID = env->GetMethodID(jClass, methodName, methodType);
  if (!methodID) {
    ALOG(
        ">>> FATAL JNI ERROR! GetMethodID(methodName=\"%s\", "
        "methodType=\"%s\") failed. Did ProGuard optimize away something it "
        "shouldn't have?",
        methodName, methodType);
    env->ExceptionDescribe();
    MOZ_CRASH();
  }
  return methodID;
}

jmethodID AndroidBridge::GetStaticMethodID(JNIEnv* env, jclass jClass,
                                           const char* methodName,
                                           const char* methodType) {
  jmethodID methodID = env->GetStaticMethodID(jClass, methodName, methodType);
  if (!methodID) {
    ALOG(
        ">>> FATAL JNI ERROR! GetStaticMethodID(methodName=\"%s\", "
        "methodType=\"%s\") failed. Did ProGuard optimize away something it "
        "shouldn't have?",
        methodName, methodType);
    env->ExceptionDescribe();
    MOZ_CRASH();
  }
  return methodID;
}

jfieldID AndroidBridge::GetFieldID(JNIEnv* env, jclass jClass,
                                   const char* fieldName,
                                   const char* fieldType) {
  jfieldID fieldID = env->GetFieldID(jClass, fieldName, fieldType);
  if (!fieldID) {
    ALOG(
        ">>> FATAL JNI ERROR! GetFieldID(fieldName=\"%s\", "
        "fieldType=\"%s\") failed. Did ProGuard optimize away something it "
        "shouldn't have?",
        fieldName, fieldType);
    env->ExceptionDescribe();
    MOZ_CRASH();
  }
  return fieldID;
}

jfieldID AndroidBridge::GetStaticFieldID(JNIEnv* env, jclass jClass,
                                         const char* fieldName,
                                         const char* fieldType) {
  jfieldID fieldID = env->GetStaticFieldID(jClass, fieldName, fieldType);
  if (!fieldID) {
    ALOG(
        ">>> FATAL JNI ERROR! GetStaticFieldID(fieldName=\"%s\", "
        "fieldType=\"%s\") failed. Did ProGuard optimize away something it "
        "shouldn't have?",
        fieldName, fieldType);
    env->ExceptionDescribe();
    MOZ_CRASH();
  }
  return fieldID;
}

void AndroidBridge::ConstructBridge() {
  /* NSS hack -- bionic doesn't handle recursive unloads correctly,
   * because library finalizer functions are called with the dynamic
   * linker lock still held.  This results in a deadlock when trying
   * to call dlclose() while we're already inside dlclose().
   * Conveniently, NSS has an env var that can prevent it from unloading.
   */
  putenv(const_cast<char*>("NSS_DISABLE_UNLOAD=1"));

  MOZ_ASSERT(!sBridge);
  sBridge = new AndroidBridge();
}

void AndroidBridge::DeconstructBridge() {
  if (sBridge) {
    delete sBridge;
    // AndroidBridge destruction requires sBridge to still be valid,
    // so we set sBridge to nullptr after deleting it.
    sBridge = nullptr;
  }
}

AndroidBridge::~AndroidBridge() {}

AndroidBridge::AndroidBridge() {
  ALOG_BRIDGE("AndroidBridge::Init");

  JNIEnv* const jEnv = jni::GetGeckoThreadEnv();
  AutoLocalJNIFrame jniFrame(jEnv);

  mMessageQueue = java::GeckoThread::MsgQueue();
  auto msgQueueClass = jni::Class::LocalRef::Adopt(
      jEnv, jEnv->GetObjectClass(mMessageQueue.Get()));
  // mMessageQueueNext must not be null
  mMessageQueueNext =
      GetMethodID(jEnv, msgQueueClass.Get(), "next", "()Landroid/os/Message;");
  // mMessageQueueMessages may be null (e.g. due to proguard optimization)
  mMessageQueueMessages = jEnv->GetFieldID(msgQueueClass.Get(), "mMessages",
                                           "Landroid/os/Message;");
}

void AndroidBridge::Vibrate(const nsTArray<uint32_t>& aPattern) {
  ALOG_BRIDGE("%s", __PRETTY_FUNCTION__);

  uint32_t len = aPattern.Length();
  if (!len) {
    ALOG_BRIDGE("  invalid 0-length array");
    return;
  }

  // It's clear if this worth special-casing, but it creates less
  // java junk, so dodges the GC.
  if (len == 1) {
    jlong d = aPattern[0];
    if (d < 0) {
      ALOG_BRIDGE("  invalid vibration duration < 0");
      return;
    }
    java::GeckoAppShell::Vibrate(d);
    return;
  }

  // First element of the array vibrate() expects is how long to wait
  // *before* vibrating.  For us, this is always 0.

  JNIEnv* const env = jni::GetGeckoThreadEnv();
  AutoLocalJNIFrame jniFrame(env, 1);

  jlongArray array = env->NewLongArray(len + 1);
  if (!array) {
    ALOG_BRIDGE("  failed to allocate array");
    return;
  }

  jlong* elts = env->GetLongArrayElements(array, nullptr);
  elts[0] = 0;
  for (uint32_t i = 0; i < aPattern.Length(); ++i) {
    jlong d = aPattern[i];
    if (d < 0) {
      ALOG_BRIDGE("  invalid vibration duration < 0");
      env->ReleaseLongArrayElements(array, elts, JNI_ABORT);
      return;
    }
    elts[i + 1] = d;
  }
  env->ReleaseLongArrayElements(array, elts, 0);

  java::GeckoAppShell::Vibrate(jni::LongArray::Ref::From(array),
                               -1 /* don't repeat */);
}

void AndroidBridge::GetIconForExtension(const nsACString& aFileExt,
                                        uint32_t aIconSize,
                                        uint8_t* const aBuf) {
  ALOG_BRIDGE("AndroidBridge::GetIconForExtension");
  NS_ASSERTION(aBuf != nullptr,
               "AndroidBridge::GetIconForExtension: aBuf is null!");
  if (!aBuf) return;

  auto arr = java::GeckoAppShell::GetIconForExtension(
      NS_ConvertUTF8toUTF16(aFileExt), aIconSize);

  NS_ASSERTION(
      arr != nullptr,
      "AndroidBridge::GetIconForExtension: Returned pixels array is null!");
  if (!arr) return;

  JNIEnv* const env = arr.Env();
  uint32_t len = static_cast<uint32_t>(env->GetArrayLength(arr.Get()));
  jbyte* elements = env->GetByteArrayElements(arr.Get(), 0);

  uint32_t bufSize = aIconSize * aIconSize * 4;
  NS_ASSERTION(
      len == bufSize,
      "AndroidBridge::GetIconForExtension: Pixels array is incomplete!");
  if (len == bufSize) memcpy(aBuf, elements, bufSize);

  env->ReleaseByteArrayElements(arr.Get(), elements, 0);
}

void AndroidBridge::GetCurrentBatteryInformation(
    hal::BatteryInformation* aBatteryInfo) {
  ALOG_BRIDGE("AndroidBridge::GetCurrentBatteryInformation");

  // To prevent calling too many methods through JNI, the Java method returns
  // an array of double even if we actually want a double and a boolean.
  auto arr = java::GeckoAppShell::GetCurrentBatteryInformation();

  JNIEnv* const env = arr.Env();
  if (!arr || env->GetArrayLength(arr.Get()) != 3) {
    return;
  }

  jdouble* info = env->GetDoubleArrayElements(arr.Get(), 0);

  aBatteryInfo->level() = info[0];
  aBatteryInfo->charging() = info[1] == 1.0f;
  aBatteryInfo->remainingTime() = info[2];

  env->ReleaseDoubleArrayElements(arr.Get(), info, 0);
}

void AndroidBridge::GetCurrentNetworkInformation(
    hal::NetworkInformation* aNetworkInfo) {
  ALOG_BRIDGE("AndroidBridge::GetCurrentNetworkInformation");

  // To prevent calling too many methods through JNI, the Java method returns
  // an array of double even if we actually want an integer, a boolean, and an
  // integer.

  auto arr = java::GeckoAppShell::GetCurrentNetworkInformation();

  JNIEnv* const env = arr.Env();
  if (!arr || env->GetArrayLength(arr.Get()) != 3) {
    return;
  }

  jdouble* info = env->GetDoubleArrayElements(arr.Get(), 0);

  aNetworkInfo->type() = info[0];
  aNetworkInfo->isWifi() = info[1] == 1.0f;
  aNetworkInfo->dhcpGateway() = info[2];

  env->ReleaseDoubleArrayElements(arr.Get(), info, 0);
}

jobject AndroidBridge::GetGlobalContextRef() {
  // The context object can change, so get a fresh copy every time.
  auto context = java::GeckoAppShell::GetApplicationContext();
  sGlobalContext = jni::Object::GlobalRef(context).Forget();
  MOZ_ASSERT(sGlobalContext);
  return sGlobalContext;
}

/* Implementation file */
NS_IMPL_ISUPPORTS(nsAndroidBridge, nsIGeckoViewEventDispatcher,
                  nsIGeckoViewBridge)

nsAndroidBridge::nsAndroidBridge() {
  if (jni::IsAvailable()) {
    RefPtr<widget::EventDispatcher> dispatcher = new widget::EventDispatcher();
    dispatcher->Attach(java::EventDispatcher::GetInstance());
    mEventDispatcher = dispatcher;
  }
}

NS_IMETHODIMP
nsAndroidBridge::GetDispatcherByName(const char* aName,
                                     nsIGeckoViewEventDispatcher** aResult) {
  if (!jni::IsAvailable()) {
    return NS_ERROR_FAILURE;
  }

  RefPtr<widget::EventDispatcher> dispatcher = new widget::EventDispatcher();
  dispatcher->Attach(java::EventDispatcher::ByName(aName));
  dispatcher.forget(aResult);
  return NS_OK;
}

nsAndroidBridge::~nsAndroidBridge() {}

nsresult AndroidBridge::GetProxyForURI(const nsACString& aSpec,
                                       const nsACString& aScheme,
                                       const nsACString& aHost,
                                       const int32_t aPort,
                                       nsACString& aResult) {
  if (!jni::IsAvailable()) {
    return NS_ERROR_FAILURE;
  }

  auto jstrRet =
      java::GeckoAppShell::GetProxyForURI(aSpec, aScheme, aHost, aPort);

  if (!jstrRet) return NS_ERROR_FAILURE;

  aResult = jstrRet->ToCString();
  return NS_OK;
}

bool AndroidBridge::PumpMessageLoop() {
  JNIEnv* const env = jni::GetGeckoThreadEnv();

  if (mMessageQueueMessages) {
    auto msg = jni::Object::LocalRef::Adopt(
        env, env->GetObjectField(mMessageQueue.Get(), mMessageQueueMessages));
    // if queue.mMessages is null, queue.next() will block, which we don't
    // want. It turns out to be an order of magnitude more performant to do
    // this extra check here and block less vs. one fewer checks here and
    // more blocking.
    if (!msg) {
      return false;
    }
  }

  auto msg = jni::Object::LocalRef::Adopt(
      env, env->CallObjectMethod(mMessageQueue.Get(), mMessageQueueNext));
  if (!msg) {
    return false;
  }

  return java::GeckoThread::PumpMessageLoop(msg);
}