/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsMacShellService.h"
#include "nsCOMPtr.h"
#include "nsIServiceManager.h"
#include "nsIStringBundle.h"
#include "nsIPromptService.h"
#include "nsIPrefService.h"
#include "nsIPrefBranch.h"
#include "nsString.h"
#include "nsEmbedCID.h"

// These Launch Services functions are undocumented. We're using them since
// they're the only way to set the default opener for URLs
extern "C" {
// Returns the CFURL for application currently set as the default opener for
// the given URL scheme. appURL must be released by the caller.
extern OSStatus _LSCopyDefaultSchemeHandlerURL(CFStringRef scheme,
                                               CFURLRef* appURL);
extern OSStatus _LSSetDefaultSchemeHandlerURL(CFStringRef scheme,
                                              CFURLRef appURL);
extern OSStatus _LSSaveAndRefresh(void);
}

NS_IMPL_ISUPPORTS(nsMacShellService, nsIShellService, nsIToolkitShellService)

nsMacShellService::nsMacShellService() : mCheckedThisSession(false) {}

NS_IMETHODIMP
nsMacShellService::IsDefaultClient(bool aStartupCheck, uint16_t aApps,
                                   bool* aIsDefaultClient) {
  *aIsDefaultClient = true;
  if (aApps & nsIShellService::MAIL)
    *aIsDefaultClient &= isDefaultHandlerForProtocol(CFSTR("mailto"));
  if (aApps & nsIShellService::NEWS)
    *aIsDefaultClient &= isDefaultHandlerForProtocol(CFSTR("news"));
  if (aApps & nsIShellService::RSS)
    *aIsDefaultClient &= isDefaultHandlerForProtocol(CFSTR("feed"));
  if (aApps & nsIShellService::CALENDAR)
    *aIsDefaultClient &= isDefaultHandlerForProtocol(CFSTR("webcal"));

  // if this is the first mail window, maintain internal state that we've
  // checked this session (so that subsequent window opens don't show the
  // default client dialog.

  if (aStartupCheck) mCheckedThisSession = true;
  return NS_OK;
}

NS_IMETHODIMP
nsMacShellService::SetDefaultClient(bool aForAllUsers, uint16_t aApps) {
  nsresult rv = NS_OK;
  if (aApps & nsIShellService::MAIL) {
    rv = setAsDefaultHandlerForProtocol(CFSTR("mailto"));
    NS_ENSURE_SUCCESS(rv, rv);
    rv = setAsDefaultHandlerForProtocol(CFSTR("mid"));
  }
  if (NS_SUCCEEDED(rv) && aApps & nsIShellService::NEWS)
    rv = setAsDefaultHandlerForProtocol(CFSTR("news"));
  if (NS_SUCCEEDED(rv) && aApps & nsIShellService::RSS)
    rv = setAsDefaultHandlerForProtocol(CFSTR("feed"));
  if (NS_SUCCEEDED(rv) && aApps & nsIShellService::CALENDAR) {
    rv = setAsDefaultHandlerForProtocol(CFSTR("webcal"));
    NS_ENSURE_SUCCESS(rv, rv);
    rv = setAsDefaultHandlerForProtocol(CFSTR("webcals"));
  }

  return rv;
}

NS_IMETHODIMP
nsMacShellService::GetShouldCheckDefaultClient(bool* aResult) {
  if (mCheckedThisSession) {
    *aResult = false;
    return NS_OK;
  }

  nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
  return prefs->GetBoolPref("mail.shell.checkDefaultClient", aResult);
}

NS_IMETHODIMP
nsMacShellService::SetShouldCheckDefaultClient(bool aShouldCheck) {
  nsCOMPtr<nsIPrefBranch> prefs(do_GetService(NS_PREFSERVICE_CONTRACTID));
  return prefs->SetBoolPref("mail.shell.checkDefaultClient", aShouldCheck);
}

bool nsMacShellService::isDefaultHandlerForProtocol(CFStringRef aScheme) {
  bool isDefault = false;
  // Since neither Launch Services nor Internet Config actually differ between
  // bundles which have the same bundle identifier (That is, if we set our
  // URL of our bundle as the default handler for the given protocol,
  // Launch Service might return the URL of another thunderbird bundle as the
  // default handler for that protocol), we are comparing the identifiers of the
  // bundles rather than their URLs.

  CFStringRef tbirdID = ::CFBundleGetIdentifier(CFBundleGetMainBundle());
  if (!tbirdID) {
    // CFBundleGetIdentifier is expected to return NULL only if the specified
    // bundle doesn't have a bundle identifier in its dictionary. In this case,
    // that means a failure, since our bundle does have an identifier.
    return isDefault;
  }

  ::CFRetain(tbirdID);

  // Get the default handler URL of the given protocol
  CFURLRef defaultHandlerURL;
  OSStatus err = ::_LSCopyDefaultSchemeHandlerURL(aScheme, &defaultHandlerURL);

  if (err == noErr) {
    // Get a reference to the bundle (based on its URL)
    CFBundleRef defaultHandlerBundle =
        ::CFBundleCreate(NULL, defaultHandlerURL);
    if (defaultHandlerBundle) {
      CFStringRef defaultHandlerID =
          ::CFBundleGetIdentifier(defaultHandlerBundle);
      if (defaultHandlerID) {
        ::CFRetain(defaultHandlerID);
        // and compare it to our bundle identifier
        isDefault = ::CFStringCompare(tbirdID, defaultHandlerID, 0) ==
                    kCFCompareEqualTo;
        ::CFRelease(defaultHandlerID);
      } else {
        // If the bundle doesn't have an identifier in its info property list,
        // it's not our bundle.
        isDefault = false;
      }

      ::CFRelease(defaultHandlerBundle);
    }

    ::CFRelease(defaultHandlerURL);
  } else {
    // If |_LSCopyDefaultSchemeHandlerURL| failed, there's no default
    // handler for the given protocol
    isDefault = false;
  }

  ::CFRelease(tbirdID);
  return isDefault;
}

nsresult nsMacShellService::setAsDefaultHandlerForProtocol(
    CFStringRef aScheme) {
  CFURLRef tbirdURL = ::CFBundleCopyBundleURL(CFBundleGetMainBundle());

  ::_LSSetDefaultSchemeHandlerURL(aScheme, tbirdURL);
  ::_LSSaveAndRefresh();
  ::CFRelease(tbirdURL);

  return NS_OK;
}