/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file macos.h Functions related to MacOS support. */

#ifndef MACOS_H
#define MACOS_H

/* It would seem that to ensure backward compability we have to ensure that we have defined MAC_OS_X_VERSION_10_x everywhere */
#ifndef MAC_OS_X_VERSION_10_3
#define MAC_OS_X_VERSION_10_3 1030
#endif

#ifndef MAC_OS_X_VERSION_10_4
#define MAC_OS_X_VERSION_10_4 1040
#endif

#ifndef MAC_OS_X_VERSION_10_5
#define MAC_OS_X_VERSION_10_5 1050
#endif

#ifndef MAC_OS_X_VERSION_10_6
#define MAC_OS_X_VERSION_10_6 1060
#endif


/*
 * Functions to show the popup window
 * use ShowMacDialog when you want to control title, message and text on the button
 * ShowMacAssertDialog is used by assert
 * ShowMacErrorDialog should be used when an unrecoverable error shows up. It only contains the title, which will should tell what went wrong
 * the function then adds text that tells the user to update and then report the bug if it's present in the newest version
 * It also quits in a nice way since we call it when we know something happened that will crash OpenTTD (like a needed pointer turns out to be NULL or similar)
 */
void ShowMacDialog ( const char *title, const char *message, const char *buttonLabel );
void ShowMacAssertDialog ( const char *function, const char *file, const int line, const char *expression );
void ShowMacErrorDialog(const char *error);

/* Since MacOS X users will never see an assert unless they started the game from a terminal
 * we're using a custom assert(e) macro. */
#undef assert

#ifdef NDEBUG
#define assert(e)       ((void)0)
#else

#define assert(e) \
		(__builtin_expect(!(e), 0) ? ShowMacAssertDialog ( __func__, __FILE__, __LINE__, #e ): (void)0 )
#endif

void GetMacOSVersion(int *return_major, int *return_minor, int *return_bugfix);

/**
 * Check if we are at least running on the specified version of Mac OS.
 * @param major major version of the os. This would be 10 in the case of 10.4.11.
 * @param minor minor version of the os. This would be 4 in the case of 10.4.11.
 * @param bugfix bugfix version of the os. This would be 11 in the case of 10.4.11.
 * @return true if the running os is at least what we asked, false otherwise.
 */
static inline bool MacOSVersionIsAtLeast(long major, long minor, long bugfix)
{
	int version_major, version_minor, version_bugfix;
	GetMacOSVersion(&version_major, &version_minor, &version_bugfix);

	if (version_major < major) return false;
	if (version_major == major && version_minor < minor) return false;
	if (version_major == major && version_minor == minor && version_bugfix < bugfix) return false;

	return true;
}

/*
 * OSX 10.3.9 has blessed us with a signal with unlikable side effects.
 * The most problematic side effect is that it makes OpenTTD 'think' that
 * it's running on 10.4.0 or higher and thus tries to link to functions
 * that are only defined there. So now we'll remove all and any signal
 * handling for OSX < 10.4 and 10.3.9 works as it should at the cost of
 * not giving a useful error when savegame loading goes wrong.
 */
#define signal(sig, func) (MacOSVersionIsAtLeast(10, 4, 0) ? signal(sig, func) : NULL)

#endif /* MACOS_H */