/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * the Mozilla Foundation <http://www.mozilla.org/>
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Benjamin Smedberg <benjamin@smedberg.us> (Original Author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsXULAppAPI.h"
#include "nsINIParser.h"
#include "nsILocalFile.h"
#include "nsAppRunner.h"
#include "nsCRTGlue.h"

void
SetAllocatedString(const char *&str, const char *newvalue)
{
  NS_Free(NS_CONST_CAST(char*, str));
  if (newvalue) {
    str = NS_strdup(newvalue);
  }
  else {
    str = nsnull;
  }
}

void
SetAllocatedString(const char *&str, const nsACString &newvalue)
{
  NS_Free(NS_CONST_CAST(char*, str));
  if (newvalue.IsEmpty()) {
    str = nsnull;
  }
  else {
    str = ToNewCString(newvalue);
  }
}

ScopedAppData::ScopedAppData(const nsXREAppData* aAppData)
{
  Zero();

  SetAllocatedString(this->vendor, aAppData->vendor);
  SetAllocatedString(this->name, aAppData->name);
  SetAllocatedString(this->version, aAppData->version);
  SetAllocatedString(this->buildID, aAppData->buildID);
  SetAllocatedString(this->ID, aAppData->ID);
  SetAllocatedString(this->copyright, aAppData->copyright);
  SetStrongPtr(this->directory, aAppData->directory);
  this->flags = aAppData->flags;

  if (aAppData->size > offsetof(nsXREAppData, xreDirectory)) {
    SetStrongPtr(this->xreDirectory, aAppData->xreDirectory);
    SetAllocatedString(this->minVersion, aAppData->minVersion);
    SetAllocatedString(this->maxVersion, aAppData->maxVersion);
  }
}

ScopedAppData::~ScopedAppData()
{
  SetAllocatedString(this->vendor, nsnull);
  SetAllocatedString(this->name, nsnull);
  SetAllocatedString(this->version, nsnull);
  SetAllocatedString(this->buildID, nsnull);
  SetAllocatedString(this->ID, nsnull);
  SetAllocatedString(this->copyright, nsnull);

  NS_IF_RELEASE(this->directory);

  SetStrongPtr(this->xreDirectory, (nsILocalFile*) nsnull);
  SetAllocatedString(this->minVersion, nsnull);
  SetAllocatedString(this->maxVersion, nsnull);
}

nsresult
XRE_CreateAppData(nsILocalFile* aINIFile, nsXREAppData **aAppData)
{
  NS_ENSURE_ARG(aINIFile && aAppData);

  nsXREAppData *data = new ScopedAppData();
  if (!data)
    return NS_ERROR_OUT_OF_MEMORY;

  nsresult rv = XRE_ParseAppData(aINIFile, data);
  if (NS_FAILED(rv)) {
    delete data;
  }
  else {
    *aAppData = data;
  }

  return rv;
}

struct ReadString {
  const char *section;
  const char *key;
  const char **buffer;
};

static void
ReadStrings(nsINIParser &parser, const ReadString *reads)
{
  nsresult rv;
  nsCString str;

  while (reads->section) {
    rv = parser.GetString(reads->section, reads->key, str);
    if (NS_SUCCEEDED(rv)) {
      SetAllocatedString(*reads->buffer, str);
    }

    ++reads;
  }
}

struct ReadFlag {
  const char *section;
  const char *key;
  PRUint32 flag;
};

static void
ReadFlags(nsINIParser &parser, const ReadFlag *reads, PRUint32 *buffer)
{
  nsresult rv;
  char buf[6]; // large enough to hold "false"

  while (reads->section) {
    rv = parser.GetString(reads->section, reads->key, buf, sizeof(buf));
    if (NS_SUCCEEDED(rv) || rv == NS_ERROR_LOSS_OF_SIGNIFICANT_DATA) {
      if (buf[0] == '1' || buf[0] == 't' || buf[0] == 'T') {
        *buffer |= reads->flag;
      }
      if (buf[0] == '0' || buf[0] == 'f' || buf[0] == 'F') {
        *buffer &= ~reads->flag;
      }
    }

    ++reads;
  }
}

nsresult
XRE_ParseAppData(nsILocalFile* aINIFile, nsXREAppData *aAppData)
{
  NS_ENSURE_ARG(aINIFile && aAppData);

  nsresult rv;

  nsINIParser parser;
  rv = parser.Init(aINIFile);
  if (NS_FAILED(rv))
    return rv;

  nsCString str;

  ReadString strings[] = {
    { "App", "Vendor",    &aAppData->vendor },
    { "App", "Name",      &aAppData->name },
    { "App", "Version",   &aAppData->version },
    { "App", "BuildID",   &aAppData->buildID },
    { "App", "ID",        &aAppData->ID },
    { "App", "Copyright", &aAppData->copyright },
    { nsnull }
  };
  ReadStrings(parser, strings);

  ReadFlag flags[] = {
    { "XRE", "EnableProfileMigrator", NS_XRE_ENABLE_PROFILE_MIGRATOR },
    { "XRE", "EnableExtensionManager", NS_XRE_ENABLE_EXTENSION_MANAGER },
    { nsnull }
  };
  ReadFlags(parser, flags, &aAppData->flags);

  if (aAppData->size > offsetof(nsXREAppData, xreDirectory)) {
    ReadString strings2[] = {
      { "Gecko", "MinVersion", &aAppData->minVersion },
      { "Gecko", "MaxVersion", &aAppData->maxVersion },
      { nsnull }
    };
    ReadStrings(parser, strings2);
  }

  return NS_OK;
}

void
XRE_FreeAppData(nsXREAppData *aAppData)
{
  if (!aAppData) {
    NS_ERROR("Invalid arg");
    return;
  }

  ScopedAppData* sad = NS_STATIC_CAST(ScopedAppData*, aAppData);
  delete sad;
}