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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "mozilla/dom/ContentChild.h"
#include "nsXULAppAPI.h"

#include "nsPrefBranch.h"
#include "nsIFile.h"
#include "nsIObserverService.h"
#include "nsXPCOM.h"
#include "nsISupportsPrimitives.h"
#include "nsIDirectoryService.h"
#include "nsString.h"
#include "nsReadableUtils.h"
#include "nsPrintfCString.h"
#include "nsIStringBundle.h"
#include "prefapi.h"
#include "PLDHashTable.h"

#include "nsCRT.h"
#include "mozilla/Services.h"

#include "prefapi_private_data.h"

#ifdef MOZ_CRASHREPORTER
#include "nsICrashReporter.h"
#endif

#include "nsIConsoleService.h"

#ifdef DEBUG
#define ENSURE_MAIN_PROCESS(message, pref) do {                                \
  if (GetContentChild()) {                                                     \
    nsPrintfCString msg("ENSURE_MAIN_PROCESS failed. %s %s", message, pref);   \
    NS_ERROR(msg.get());                                                       \
    return NS_ERROR_NOT_AVAILABLE;                                             \
  }                                                                            \
} while (0);
#else
#define ENSURE_MAIN_PROCESS(message, pref)                                     \
  if (GetContentChild()) {                                                     \
    return NS_ERROR_NOT_AVAILABLE;                                             \
  }
#endif

using mozilla::dom::ContentChild;

static ContentChild*
GetContentChild()
{
  if (XRE_IsContentProcess()) {
    ContentChild* cpc = ContentChild::GetSingleton();
    if (!cpc) {
      MOZ_CRASH("Content Protocol is NULL!  We're going to crash!");
    }
    return cpc;
  }
  return nullptr;
}

/*
 * Constructor/Destructor
 */

nsPrefBranch::nsPrefBranch(const char *aPrefRoot, bool aDefaultBranch)
  : mPrefRoot(aPrefRoot)
  , mIsDefault(aDefaultBranch)
  , mFreeingObserverList(false)
  , mObservers()
{
  nsCOMPtr<nsIObserverService> observerService =
    mozilla::services::GetObserverService();
  if (observerService) {
    ++mRefCnt;    // Our refcnt must be > 0 when we call this, or we'll get deleted!
    // add weak so we don't have to clean up at shutdown
    observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true);
    --mRefCnt;
  }
}

nsPrefBranch::~nsPrefBranch()
{
  freeObserverList();

  nsCOMPtr<nsIObserverService> observerService =
    mozilla::services::GetObserverService();
  if (observerService)
    observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
}


/*
 * nsISupports Implementation
 */

NS_IMPL_ADDREF(nsPrefBranch)
NS_IMPL_RELEASE(nsPrefBranch)

NS_INTERFACE_MAP_BEGIN(nsPrefBranch)
  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIPrefBranch)
  NS_INTERFACE_MAP_ENTRY(nsIPrefBranch)
  NS_INTERFACE_MAP_ENTRY(nsIObserver)
  NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END


/*
 * nsIPrefBranch Implementation
 */

NS_IMETHODIMP nsPrefBranch::GetRoot(char **aRoot)
{
  NS_ENSURE_ARG_POINTER(aRoot);
  *aRoot = ToNewCString(mPrefRoot);
  return NS_OK;
}

NS_IMETHODIMP nsPrefBranch::GetPrefType(const char *aPrefName, int32_t *_retval)
{
  NS_ENSURE_ARG(aPrefName);
  const PrefName& pref = getPrefName(aPrefName);
  switch (PREF_GetPrefType(pref.get())) {
    case PrefType::String:
      *_retval = PREF_STRING;
      break;
    case PrefType::Int:
      *_retval = PREF_INT;
      break;
    case PrefType::Bool:
      *_retval = PREF_BOOL;
        break;
    case PrefType::Invalid:
    default:
      *_retval = PREF_INVALID;
      break;
  }
  return NS_OK;
}

NS_IMETHODIMP nsPrefBranch::GetBoolPrefWithDefault(const char *aPrefName,
                                                   bool aDefaultValue,
                                                   uint8_t _argc, bool *_retval)
{
  nsresult rv = GetBoolPref(aPrefName, _retval);

  if (NS_FAILED(rv) && _argc == 1) {
    *_retval = aDefaultValue;
    return NS_OK;
  }

  return rv;
}

NS_IMETHODIMP nsPrefBranch::GetBoolPref(const char *aPrefName, bool *_retval)
{
  NS_ENSURE_ARG(aPrefName);
  const PrefName& pref = getPrefName(aPrefName);
  return PREF_GetBoolPref(pref.get(), _retval, mIsDefault);
}

NS_IMETHODIMP nsPrefBranch::SetBoolPref(const char *aPrefName, bool aValue)
{
  ENSURE_MAIN_PROCESS("Cannot SetBoolPref from content process:", aPrefName);
  NS_ENSURE_ARG(aPrefName);
  const PrefName& pref = getPrefName(aPrefName);
  return PREF_SetBoolPref(pref.get(), aValue, mIsDefault);
}

NS_IMETHODIMP nsPrefBranch::GetFloatPrefWithDefault(const char *aPrefName,
                                                    float aDefaultValue,
                                                    uint8_t _argc, float *_retval)
{
  nsresult rv = GetFloatPref(aPrefName, _retval);

  if (NS_FAILED(rv) && _argc == 1) {
    *_retval = aDefaultValue;
    return NS_OK;
  }

  return rv;
}

NS_IMETHODIMP nsPrefBranch::GetFloatPref(const char *aPrefName, float *_retval)
{
  NS_ENSURE_ARG(aPrefName);
  nsAutoCString stringVal;
  nsresult rv = GetCharPref(aPrefName, getter_Copies(stringVal));
  if (NS_SUCCEEDED(rv)) {
    *_retval = stringVal.ToFloat(&rv);
  }

  return rv;
}

NS_IMETHODIMP nsPrefBranch::GetCharPrefWithDefault(const char *aPrefName,
                                                   const char *aDefaultValue,
                                                   uint8_t _argc, char **_retval)
{
  nsresult rv = GetCharPref(aPrefName, _retval);

  if (NS_FAILED(rv) && _argc == 1) {
    NS_ENSURE_ARG(aDefaultValue);
    *_retval = NS_strdup(aDefaultValue);
    return NS_OK;
  }

  return rv;
}

NS_IMETHODIMP nsPrefBranch::GetCharPref(const char *aPrefName, char **_retval)
{
  NS_ENSURE_ARG(aPrefName);
  const PrefName& pref = getPrefName(aPrefName);
  return PREF_CopyCharPref(pref.get(), _retval, mIsDefault);
}

NS_IMETHODIMP nsPrefBranch::SetCharPref(const char *aPrefName, const char *aValue)
{
  nsresult rv = CheckSanityOfStringLength(aPrefName, aValue);
  if (NS_FAILED(rv)) {
    return rv;
  }
  return SetCharPrefInternal(aPrefName, aValue);
}

nsresult nsPrefBranch::SetCharPrefInternal(const char *aPrefName, const char *aValue)

{
  ENSURE_MAIN_PROCESS("Cannot SetCharPref from content process:", aPrefName);
  NS_ENSURE_ARG(aPrefName);
  NS_ENSURE_ARG(aValue);
  const PrefName& pref = getPrefName(aPrefName);
  return PREF_SetCharPref(pref.get(), aValue, mIsDefault);
}

NS_IMETHODIMP nsPrefBranch::GetStringPref(const char *aPrefName,
                                          const nsACString& aDefaultValue,
                                          uint8_t _argc,
                                          nsACString& _retval)
{
  nsCString utf8String;
  nsresult rv = GetCharPref(aPrefName, getter_Copies(utf8String));
  if (NS_SUCCEEDED(rv)) {
    _retval = utf8String;
    return rv;
  }

  if (_argc == 1) {
    _retval = aDefaultValue;
    return NS_OK;
  }

  return rv;
}

NS_IMETHODIMP nsPrefBranch::SetStringPref(const char *aPrefName, const nsACString& aValue)
{
  nsresult rv = CheckSanityOfStringLength(aPrefName, aValue);
  if (NS_FAILED(rv)) {
    return rv;
  }

  return SetCharPrefInternal(aPrefName, PromiseFlatCString(aValue).get());
}

NS_IMETHODIMP nsPrefBranch::GetIntPrefWithDefault(const char *aPrefName,
                                                  int32_t aDefaultValue,
                                                  uint8_t _argc, int32_t *_retval)
{
  nsresult rv = GetIntPref(aPrefName, _retval);

  if (NS_FAILED(rv) && _argc == 1) {
    *_retval = aDefaultValue;
    return NS_OK;
  }

  return rv;
}

NS_IMETHODIMP nsPrefBranch::GetIntPref(const char *aPrefName, int32_t *_retval)
{
  NS_ENSURE_ARG(aPrefName);
  const PrefName& pref = getPrefName(aPrefName);
  return PREF_GetIntPref(pref.get(), _retval, mIsDefault);
}

NS_IMETHODIMP nsPrefBranch::SetIntPref(const char *aPrefName, int32_t aValue)
{
  ENSURE_MAIN_PROCESS("Cannot SetIntPref from content process:", aPrefName);
  NS_ENSURE_ARG(aPrefName);
  const PrefName& pref = getPrefName(aPrefName);
  return PREF_SetIntPref(pref.get(), aValue, mIsDefault);
}

NS_IMETHODIMP nsPrefBranch::GetComplexValue(const char *aPrefName, const nsIID & aType, void **_retval)
{
  NS_ENSURE_ARG(aPrefName);

  nsresult rv;
  nsCString utf8String;

  // we have to do this one first because it's different than all the rest
  if (aType.Equals(NS_GET_IID(nsIPrefLocalizedString))) {
    nsCOMPtr<nsIPrefLocalizedString> theString(do_CreateInstance(NS_PREFLOCALIZEDSTRING_CONTRACTID, &rv));
    if (NS_FAILED(rv)) return rv;

    const PrefName& pref = getPrefName(aPrefName);
    bool    bNeedDefault = false;

    if (mIsDefault) {
      bNeedDefault = true;
    } else {
      // if there is no user (or locked) value
      if (!PREF_HasUserPref(pref.get()) && !PREF_PrefIsLocked(pref.get())) {
        bNeedDefault = true;
      }
    }

    // if we need to fetch the default value, do that instead, otherwise use the
    // value we pulled in at the top of this function
    if (bNeedDefault) {
      nsAutoString utf16String;
      rv = GetDefaultFromPropertiesFile(pref.get(), utf16String);
      if (NS_SUCCEEDED(rv)) {
        theString->SetData(utf16String.get());
      }
    } else {
      rv = GetCharPref(aPrefName, getter_Copies(utf8String));
      if (NS_SUCCEEDED(rv)) {
        theString->SetData(NS_ConvertUTF8toUTF16(utf8String).get());
      }
    }

    if (NS_SUCCEEDED(rv)) {
      theString.forget(reinterpret_cast<nsIPrefLocalizedString**>(_retval));
    }

    return rv;
  }

  // if we can't get the pref, there's no point in being here
  rv = GetCharPref(aPrefName, getter_Copies(utf8String));
  if (NS_FAILED(rv)) {
    return rv;
  }

  if (aType.Equals(NS_GET_IID(nsIFile))) {
    if (GetContentChild()) {
      NS_ERROR("cannot get nsIFile pref from content process");
      return NS_ERROR_NOT_AVAILABLE;
    }

    nsCOMPtr<nsIFile> file(do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv));

    if (NS_SUCCEEDED(rv)) {
      rv = file->SetPersistentDescriptor(utf8String);
      if (NS_SUCCEEDED(rv)) {
        file.forget(reinterpret_cast<nsIFile**>(_retval));
        return NS_OK;
      }
    }
    return rv;
  }

  if (aType.Equals(NS_GET_IID(nsIRelativeFilePref))) {
    if (GetContentChild()) {
      NS_ERROR("cannot get nsIRelativeFilePref from content process");
      return NS_ERROR_NOT_AVAILABLE;
    }

    nsACString::const_iterator keyBegin, strEnd;
    utf8String.BeginReading(keyBegin);
    utf8String.EndReading(strEnd);

    // The pref has the format: [fromKey]a/b/c
    if (*keyBegin++ != '[')
      return NS_ERROR_FAILURE;
    nsACString::const_iterator keyEnd(keyBegin);
    if (!FindCharInReadable(']', keyEnd, strEnd))
      return NS_ERROR_FAILURE;
    nsAutoCString key(Substring(keyBegin, keyEnd));

    nsCOMPtr<nsIFile> fromFile;
    nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv));
    if (NS_FAILED(rv))
      return rv;
    rv = directoryService->Get(key.get(), NS_GET_IID(nsIFile), getter_AddRefs(fromFile));
    if (NS_FAILED(rv))
      return rv;

    nsCOMPtr<nsIFile> theFile;
    rv = NS_NewNativeLocalFile(EmptyCString(), true, getter_AddRefs(theFile));
    if (NS_FAILED(rv))
      return rv;
    rv = theFile->SetRelativeDescriptor(fromFile, Substring(++keyEnd, strEnd));
    if (NS_FAILED(rv))
      return rv;
    nsCOMPtr<nsIRelativeFilePref> relativePref;
    rv = NS_NewRelativeFilePref(theFile, key, getter_AddRefs(relativePref));
    if (NS_FAILED(rv))
      return rv;

    relativePref.forget(reinterpret_cast<nsIRelativeFilePref**>(_retval));
    return NS_OK;
  }

  if (aType.Equals(NS_GET_IID(nsISupportsString))) {
    nsCOMPtr<nsISupportsString> theString(do_CreateInstance(NS_SUPPORTS_STRING_CONTRACTID, &rv));

    if (NS_SUCCEEDED(rv)) {
      // Debugging to see why we end up with very long strings here with
      // some addons, see bug 836263.
      nsAutoString wdata;
      if (!AppendUTF8toUTF16(utf8String, wdata, mozilla::fallible)) {
#ifdef MOZ_CRASHREPORTER
        nsCOMPtr<nsICrashReporter> cr =
          do_GetService("@mozilla.org/toolkit/crash-reporter;1");
        if (cr) {
          cr->AnnotateCrashReport(NS_LITERAL_CSTRING("bug836263-size"),
                                  nsPrintfCString("%x", utf8String.Length()));
          cr->RegisterAppMemory(uint64_t(utf8String.BeginReading()),
                                std::min(0x1000U, utf8String.Length()));
        }
#endif
        MOZ_CRASH("bug836263");
      }
      theString->SetData(wdata);
      theString.forget(reinterpret_cast<nsISupportsString**>(_retval));
    }
    return rv;
  }

  NS_WARNING("nsPrefBranch::GetComplexValue - Unsupported interface type");
  return NS_NOINTERFACE;
}

nsresult nsPrefBranch::CheckSanityOfStringLength(const char* aPrefName, const char* aValue) {
  if (!aValue) {
    return NS_OK;
  }
  return CheckSanityOfStringLength(aPrefName, strlen(aValue));
}

nsresult nsPrefBranch::CheckSanityOfStringLength(const char* aPrefName, const nsAString& aValue) {
  return CheckSanityOfStringLength(aPrefName, aValue.Length());
}

nsresult nsPrefBranch::CheckSanityOfStringLength(const char* aPrefName, const nsACString& aValue) {
  return CheckSanityOfStringLength(aPrefName, aValue.Length());
}

nsresult nsPrefBranch::CheckSanityOfStringLength(const char* aPrefName, const uint32_t aLength) {
  if (aLength > MAX_PREF_LENGTH) {
    return NS_ERROR_ILLEGAL_VALUE;
  }
  if (aLength <= MAX_ADVISABLE_PREF_LENGTH) {
    return NS_OK;
  }
  nsresult rv;
  nsCOMPtr<nsIConsoleService> console = do_GetService("@mozilla.org/consoleservice;1", &rv);
  if (NS_FAILED(rv)) {
    return rv;
  }
  nsAutoCString message(nsPrintfCString("Warning: attempting to write %d bytes to preference %s. This is bad "
                                        "for general performance and memory usage. Such an amount of data "
                                        "should rather be written to an external file. This preference will "
                                        "not be sent to any content processes.",
                                        aLength,
                                        getPrefName(aPrefName).get()));
  rv = console->LogStringMessage(NS_ConvertUTF8toUTF16(message).get());
  if (NS_FAILED(rv)) {
    return rv;
  }
  return NS_OK;
}

/*static*/
void nsPrefBranch::ReportToConsole(const nsAString& aMessage)
{
  nsresult rv;
  nsCOMPtr<nsIConsoleService> console = do_GetService("@mozilla.org/consoleservice;1", &rv);
  if (NS_FAILED(rv)) {
    return;
  }
  nsAutoString message(aMessage);
  console->LogStringMessage(message.get());
}

NS_IMETHODIMP nsPrefBranch::SetComplexValue(const char *aPrefName, const nsIID & aType, nsISupports *aValue)
{
  ENSURE_MAIN_PROCESS("Cannot SetComplexValue from content process:", aPrefName);
  NS_ENSURE_ARG(aPrefName);

  nsresult   rv = NS_NOINTERFACE;

  if (aType.Equals(NS_GET_IID(nsIFile))) {
    nsCOMPtr<nsIFile> file = do_QueryInterface(aValue);
    if (!file)
      return NS_NOINTERFACE;
    nsAutoCString descriptorString;

    rv = file->GetPersistentDescriptor(descriptorString);
    if (NS_SUCCEEDED(rv)) {
      rv = SetCharPrefInternal(aPrefName, descriptorString.get());
    }
    return rv;
  }

  if (aType.Equals(NS_GET_IID(nsIRelativeFilePref))) {
    nsCOMPtr<nsIRelativeFilePref> relFilePref = do_QueryInterface(aValue);
    if (!relFilePref)
      return NS_NOINTERFACE;

    nsCOMPtr<nsIFile> file;
    relFilePref->GetFile(getter_AddRefs(file));
    if (!file)
      return NS_NOINTERFACE;
    nsAutoCString relativeToKey;
    (void) relFilePref->GetRelativeToKey(relativeToKey);

    nsCOMPtr<nsIFile> relativeToFile;
    nsCOMPtr<nsIProperties> directoryService(do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv));
    if (NS_FAILED(rv))
      return rv;
    rv = directoryService->Get(relativeToKey.get(), NS_GET_IID(nsIFile), getter_AddRefs(relativeToFile));
    if (NS_FAILED(rv))
      return rv;

    nsAutoCString relDescriptor;
    rv = file->GetRelativeDescriptor(relativeToFile, relDescriptor);
    if (NS_FAILED(rv))
      return rv;

    nsAutoCString descriptorString;
    descriptorString.Append('[');
    descriptorString.Append(relativeToKey);
    descriptorString.Append(']');
    descriptorString.Append(relDescriptor);
    return