/*******************************************************************************

 Copyright (c) 2009, Charles McGarvey
 All rights reserved.
 
 Redistribution   and   use  in  source  and  binary  forms,  with  or  without
 modification, are permitted provided that the following conditions are met:
 
   * Redistributions  of  source  code  must retain the above copyright notice,
     this list of conditions and the following disclaimer.
   * Redistributions  in binary form must reproduce the above copyright notice,
     this  list of conditions and the following disclaimer in the documentation
     and/or other materials provided with the distribution.
 
 THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*******************************************************************************/

#include <cstdlib>		// atexit, getenv
#include <iostream>
#include <string>
#include <unistd.h>		// access

#include <Moof/Log.hh>
#include <Moof/ModalDialog.hh>
#include <Moof/OpenGL.hh>
#include <Moof/Resource.hh>
#include <Moof/Settings.hh>
#include <Moof/Transition.hh>
#include <Moof/Video.hh>

#include "ErrorHandler.hh"
#include "GameLayer.hh"
#include "Main.hh"
#include "TitleLayer.hh"

#if HAVE_CONFIG_H
#include "config.h"
#endif
#include "version.h"


Main::Main()
{
	mDispatchHandler = Mf::core.addHandler("video.newcontext",
			boost::bind(&Main::contextCreated));
	setupGL();
}

void Main::addedToCore()
{
	//Mf::Scalar coeff[] = {0.0, 1.0};
	//Mf::Lerp interp(coeff, 0.25);

	//Mf::LayerP gameLayer = GameLayer::alloc();
	//Mf::Transition<Mf::Lerp>::Ptr transition =
		//Mf::Transition<Mf::Lerp>::alloc(gameLayer, Mf::LayerP(), interp);
	//core.push(transition);
	//core.push(GameLayer::alloc());
	Mf::core.push(TitleLayer::alloc());
}


void Main::update(Mf::Scalar t, Mf::Scalar dt)
{
	if (Mf::core.getSize() == 1)
	{
		// this is the only layer left on the stack
		//Mf::core.push(TitleLayer::alloc());
		Mf::core.clear();
	}
}

void Main::draw(Mf::Scalar alpha) const
{
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

bool Main::handleEvent(const Mf::Event& event)
{
	switch (event.type)
	{
		case SDL_KEYUP:
			if (event.key.keysym.sym == SDLK_ESCAPE)
			{
				Mf::core.clear();
			}
			else if (event.key.keysym.sym == SDLK_f)
			{
				Mf::video->toggleFull();
			}
			else if (event.key.keysym.sym == SDLK_l)
			{
				Mf::video->toggleCursorGrab();
				Mf::video->toggleCursorVisible();
			}
			break;

		case SDL_VIDEORESIZE:
			glViewport(0, 0, event.resize.w, event.resize.h);
			break;

		case SDL_QUIT:
			Mf::core.clear();
			break;
	}

	return false;
}


std::string Main::getSearchPath()
{
	// Add search paths; they should be searched in this order:
	// 1. YOINK_DATADIR (environment)
	// 2. YOINK_DATADIR (configure)
	
	std::string path;

	char* dataDir = getenv("YOINK_DATADIR");
	if (dataDir)
	{
		path += dataDir;
		path += ":";
	}
	path += YOINK_DATADIR;

	return path;
}

std::string Main::getConfigPath()
{
	// Build the list of config files to search for, in this order:
	// 1. YOINK_DATADIR/yoinkrc
	// 2. /etc/yoinkrc (not for Windows)
	// 3. $HOME/.yoinkrc
	// 4. YOINKRC (environment)

	std::string path = Mf::Resource::getPath("yoinkrc");

#if !defined(_WIN32) && !defined(__WIN32__)
	path += ":/etc/yoinkrc";
#endif
	path += ":$HOME/.yoinkrc";

	char* configFile = getenv("YOINKRC");
	if (configFile)
	{
		path += ":";
		path += configFile;
	}

	return path;
}


void Main::setupGL()
{
	glEnable(GL_TEXTURE_2D);
	glEnable(GL_DEPTH_TEST);

	glEnable(GL_LINE_SMOOTH);
	glEnable(GL_POLYGON_SMOOTH);
	glShadeModel(GL_SMOOTH);

	//glEnable(GL_BLEND);
	//glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glEnable(GL_ALPHA_TEST);
	glAlphaFunc(GL_GREATER, 0.0);

	glClearColor(0.0, 0.0, 0.0, 1.0);

	//glMatrixMode(GL_PROJECTION);
	//glLoadIdentity();
	//Mf::Scalar ratio = Mf::core.getVideo()->getWidth() /
		//Mf::core.getVideo()->getHeight();
	//gluPerspective(60.0, ratio, 1.0, 250.0);

	//glMatrixMode(GL_MODELVIEW);
}

void Main::contextCreated()
{
	// whenever the context is destroyed and a new one created, it probably
	// won't contain our state so we need to set that up again
	setupGL();
}



void Main::printUsage()
{
	std::cout << "Usage: "PACKAGE" [-h|--help] [-i|--info] [OPTION=VALUE]..."
			  << std::endl
			  << "The alien-smashing action game." << std::endl
			  << std::endl
			  << "Options:" << std::endl
			  << "  -h, --help" << std::endl
			  << "      show this help and exit" << std::endl
			  << "  -i, --info" << std::endl
			  << "      show version and build information" << std::endl
			  << "  detail=1|2|3" << std::endl
			  << "      the level of detail of game scenes" << std::endl
			  << "  fullscreen=true|false" << std::endl
			  << "      if true, uses the entire display" << std::endl
			  << "  framerate=num" << std::endl
			  << "      the target number of frames per second" << std::endl
			  << std::endl
			  << "See documentation for more options." << std::endl;
}

void Main::printInfo(int argc, char* argv[])
{
	std::string assets;
	std::string datadir;
	std::string config;

	assets.assign(YOINK_DATADIR);
	int accessible = access(assets.c_str(), R_OK);
	if (accessible != 0) assets += " (no access)";

	char* temp = getenv("YOINK_DATADIR");
	if (temp)
	{
		datadir = temp;
		accessible = access(temp, R_OK);
		if (accessible != 0) datadir += " (no access)";
	}

	temp = getenv("YOINKRC");
	if (temp)
	{
		config = temp;
		accessible = access(temp, R_OK);
		if (accessible != 0) config += " (no access)";
	}

	std::cout << "   Executable: " << argv[0] << std::endl
			  << "      Version: "VERSION << std::endl
			  << "        Built: " << COMPILE_TIME << std::endl
			  << "     Compiler: "COMPILER_STRING << std::endl
			  << "       Assets: " << assets << std::endl
			  << "Build options: "
#ifdef NDEBUG
			  << "-"
#endif
			  << "debug "
#ifndef USE_DOUBLE_PRECISION
			  << "-"
#endif
			  << "double-precision "
#ifndef USE_GTK
			  << "-"
#endif
			  << "gtk "
#ifndef PROFILING_ENABLED
			  << "-"
#endif
			  << "profile "
#ifndef USE_QT4
			  << "-"
#endif
			  << "qt4 "
#ifndef USE_THREADS
			  << "-"
#endif
			  << "threads" << std::endl
			  << "      YOINKRC: " << config << std::endl
			  << "YOINK_DATADIR: " << datadir << std::endl;
}


void hello()
{
	std::cout << std::endl << PACKAGE_STRING << std::endl
			  << "Compiled " << __TIME__ " " __DATE__ << std::endl
			  << "Send patches and bug reports to <"
			  PACKAGE_BUGREPORT << ">." << std::endl << std::endl;
}

void goodbye()
{
	std::cout << std::endl << "Goodbye..." << std::endl << std::endl;
}

int main(int argc, char* argv[])
{
	if (argc > 1)
	{
		std::string arg(argv[1]);
		if (arg == "-h" || arg == "--help")
		{
			Main::printUsage();
			return 0;
		}
		else if (arg == "-i" || arg == "--info")
		{
			Main::printInfo(argc, argv);
			return 0;
		}
	}

	hello();
	atexit(goodbye);

	Mf::Resource::addSearchPaths(Main::getSearchPath());

	Mf::settings.loadFromFiles(Main::getConfigPath());
	Mf::settings.parseArgs(argc, argv);

	Mf::Log::Level logLevel;
	if (Mf::settings.get("loglevel", logLevel)) Mf::Log::setLevel(logLevel);

	try
	{
		Mf::Video video(PACKAGE_STRING, Mf::Resource::getPath(PACKAGE".png"));
		MainP app = Main::alloc();
		Mf::core.push(app);
		Mf::core.run();
	}
	catch (const Mf::Error& error)
	{
		Mf::ModalDialog dialog;
		dialog.title = PACKAGE_STRING;
		dialog.text1 = "Unhandled Exception";
		dialog.text2 = getErrorString(error);
		dialog.type = Mf::ModalDialog::CRITICAL;
		dialog.run();

		return 1;
	}

	return 0;
}


/** vim: set ts=4 sw=4 tw=80: *************************************************/