// ==============================================================
//	This file is part of Glest (www.glest.org)
//
//	Copyright (C) 2001-2005 Martiņo Figueroa
//
//	You can redistribute this code 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
// ==============================================================

#include "logger.h"

#include "util.h"
#include "renderer.h"
#include "core_data.h"
#include "metrics.h"
#include "lang.h"
#include "leak_dumper.h"

using namespace std;
using namespace Shared::Graphics;

namespace Glest{ namespace Game{

// =====================================================
//	class Logger
// =====================================================

const int Logger::logLineCount= 15;

// ===================== PUBLIC ======================== 

Logger::Logger(){
	fileName= "log.txt";
}

Logger & Logger::getInstance(){
	static Logger logger;
	return logger;
}

void Logger::setState(const string &state){
	this->state= state;
	logLines.clear();
}

void Logger::add(const string &str,  bool renderScreen){
	FILE *f=fopen(fileName.c_str(), "at+");
	if(f==NULL){
		throw runtime_error("Error opening log file"+ fileName);
	}
	fprintf(f, "%s\n", str.c_str());
    fclose(f);
	
	logLines.push_back(str);
	if(logLines.size() > logLineCount){
		logLines.pop_front();
	}
	if(renderScreen){
		renderLoadingScreen();
	}
}

/*void Logger::addLoad(const string &text, bool renderScreen){
	appendText(text, "Loading", renderScreen);
}

void Logger::addInit(const string &text, bool renderScreen){
	appendText(text, "Initializing", renderScreen);
}

void Logger::addDelete(const string &text, bool renderScreen){
	appendText(text, "Deleting", renderScreen);
}*/

void Logger::clear(){
    string s="Log file\n";

	FILE *f= fopen(fileName.c_str(), "wt+");
	if(f==NULL){
		throw runtime_error("Error opening log file"+ fileName);
	}
    
    fprintf(f, "%s", s.c_str());
	fprintf(f, "\n");

    fclose(f);
}

// ==================== PRIVATE ==================== 

void Logger::renderLoadingScreen(){

	Renderer &renderer= Renderer::getInstance();
	CoreData &coreData= CoreData::getInstance();
	const Metrics &metrics= Metrics::getInstance();

	renderer.reset2d();
	renderer.clearBuffers();

	renderer.renderBackground(CoreData::getInstance().getBackgroundTexture());
	
	renderer.renderText(
		state, coreData.getMenuFontBig(), Vec3f(1.f), 
		metrics.getVirtualW()/4, 70*metrics.getVirtualH()/100, false);

	int offset= 0;
	Font2D *font= coreData.getMenuFontNormal();
	for(Strings::reverse_iterator it= logLines.rbegin(); it!=logLines.rend(); ++it){
		float alpha= offset==0? 1.0f: 0.8f-0.8f*static_cast<float>(offset)/logLines.size();
		renderer.renderText(
			*it, font, alpha , 
			metrics.getVirtualW()/4, 
			65*metrics.getVirtualH()/100 - offset*(font->getSize()+4), 
			false);
		++offset;
	}
	
	renderer.swapBuffers();
}

}}//end namespace