/******************************************************************************
    Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.com>

    This program 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, either version 2 of the License, or
    (at your option) any later version.

    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/

#include <sstream>
#include <dlfcn.h>
#include <util/base.h>
#include <obs-config.h>
#include "platform.hpp"
#include "obs-app.hpp"

#include <unistd.h>

#import <AppKit/AppKit.h>

using namespace std;

bool GetDataFilePath(const char *data, string &output)
{
	stringstream str;
	str << OBS_DATA_PATH "/obs-studio/" << data;
	output = str.str();
	return !access(output.c_str(), R_OK);
}

bool InitApplicationBundle()
{
#ifdef OBS_OSX_BUNDLE
	static bool initialized = false;
	if (initialized)
		return true;

	try {
		NSBundle *bundle = [NSBundle mainBundle];
		if (!bundle)
			throw "Could not find main bundle";

		NSString *exe_path = [bundle executablePath];
		if (!exe_path)
			throw "Could not find executable path";

		NSString *path = [exe_path stringByDeletingLastPathComponent];

		if (chdir([path fileSystemRepresentation]))
			throw "Could not change working directory to "
			      "bundle path";

	} catch (const char* error) {
		blog(LOG_ERROR, "InitBundle: %s", error);
		return false;
	}

	return initialized = true;
#else
	return true;
#endif
}

string GetDefaultVideoSavePath()
{
	NSFileManager *fm = [NSFileManager defaultManager];
	NSURL *url = [fm URLForDirectory:NSMoviesDirectory
				inDomain:NSUserDomainMask
		       appropriateForURL:nil
				  create:true
				   error:nil];
	
	if (!url)
		return getenv("HOME");

	return url.path.fileSystemRepresentation;
}

vector<string> GetPreferredLocales()
{
	NSArray *preferred = [NSLocale preferredLanguages];

	auto locales = GetLocaleNames();
	auto lang_to_locale = [&locales](string lang) -> string {
		string lang_match = "";

		for (const auto &locale : locales) {
			if (locale.first == lang.substr(0, locale.first.size()))
				return locale.first;

			if (!lang_match.size() &&
				locale.first.substr(0, 2) == lang.substr(0, 2))
				lang_match = locale.first;
		}

		return lang_match;
	};

	vector<string> result;
	result.reserve(preferred.count);

	for (NSString *lang in preferred) {
		string locale = lang_to_locale(lang.UTF8String);
		if (!locale.size())
			continue;

		if (find(begin(result), end(result), locale) != end(result))
			continue;

		result.emplace_back(locale);
	}

	return result;
}

bool IsAlwaysOnTop(QWidget *window)
{
	return (window->windowFlags() & Qt::WindowStaysOnTopHint) != 0;
}

void SetAlwaysOnTop(QWidget *window, bool enable)
{
	Qt::WindowFlags flags = window->windowFlags();

	if (enable)
		flags |= Qt::WindowStaysOnTopHint;
	else
		flags &= ~Qt::WindowStaysOnTopHint;

	window->setWindowFlags(flags);
	window->show();
}

typedef void (*set_int_t)(int);

void EnableOSXVSync(bool enable)
{
	static bool initialized = false;
	static bool valid = false;
	static set_int_t set_debug_options = nullptr;
	static set_int_t deferred_updates = nullptr;

	if (!initialized) {
		void *quartzCore = dlopen("/System/Library/Frameworks/"
				"QuartzCore.framework/QuartzCore", RTLD_LAZY);
		if (quartzCore) {
			set_debug_options = (set_int_t)dlsym(quartzCore,
					"CGSSetDebugOptions");
			deferred_updates = (set_int_t)dlsym(quartzCore,
					"CGSDeferredUpdates");

			valid = set_debug_options && deferred_updates;
		}

		initialized = true;
	}

	if (valid) {
		set_debug_options(enable ? 0 : 0x08000000);
		deferred_updates(enable ? 1 : 0);
	}
}