StatisticsManager.h
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	/*
	* Copyright (C) 2012 Me and My Shadow
	*
	* This file is part of Me and My Shadow.
	*
	* Me and My Shadow 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 3 of the License, or
	* (at your option) any later version.
	*
	* Me and My Shadow 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 Me and My Shadow. If not, see <http://www.gnu.org/licenses/>.
	*/

	#ifndef STATISTICSMANAGER_H
	#define STATISTICSMANAGER_H

	#include <SDL/SDL.h>
	#include <string>
	#include <vector>
	#include <map>
	#include <time.h>

	enum AchievementDisplayStyle{
	ACHIEVEMENT_HIDDEN,
	ACHIEVEMENT_TITLE,
	ACHIEVEMENT_ALL,
	ACHIEVEMENT_PROGRESS,
	};

	//internal struct for achievement info
	struct AchievementInfo{
	//achievement id for save to statistics file
	const char* id;
	//achievement name for display
	const char* name;
	//achievement image. NULL for no image. will be loaded at getDataPath()+imageFile
	const char* imageFile;
	//image offset and size.
	SDL_Rect r;
	//achievement description. supports multi-line text
	const char* description;
	//display style
	AchievementDisplayStyle displayStyle;

	//SDL_Surface of achievement image.
	SDL_Surface* imageSurface;
	};

	struct OwnedAchievement{
	time_t achievedTime;
	AchievementInfo* info;
	};

	class StatisticsScreen;

	class StatisticsManager{
	friend class StatisticsScreen;
	public:
	//Player and shadow traveling distance (m), 1 block = 1 meter
	float playerTravelingDistance,shadowTravelingDistance;
	//Player and shadow jumps
	int playerJumps,shadowJumps;
	//Player and shadow dies
	int playerDies,shadowDies;
	//Player and shadow squashed
	int playerSquashed,shadowSquashed;
	//Completed levels. Note: this is dynamically calculated, and doesn't save to file.
	int completedLevels,silverLevels,goldLevels;
	//Record times
	int recordTimes;
	//number of switched pulled
	int switchTimes;
	//swap times
	int swapTimes;
	//save and load times
	int saveTimes,loadTimes;
	//play time (s)
	int playTime;
	//level edit time (s)
	int levelEditTime;
	//created levels
	int createdLevels;
	private:
	//current achievement displayed time
	int achievementTime;
	//some picture
	SDL_Surface bmDropShadow,bmQuestionMark;
	//SDL_Surface for current achievement (excluding drop shadow)
	SDL_Surface *bmAchievement;
	//currently owned achievements
	std::map<std::string,OwnedAchievement> achievements;
	//queued achievements for display
	std::vector<AchievementInfo*> queuedAchievements;
	//currently displayed achievement
	int currentAchievement;
	//starting time
	time_t startTime;
	//level edit starting time
	time_t levelEditStartTime;
	//statistics for tutorial level pack
	int tutorialLevels,tutorialCompleted,tutorialGold;
	public:
	StatisticsManager();
	~StatisticsManager();

	//clear the statistics and achievements.
	void clear();
	//load needed picture
	void loadPicture();
	//register avaliable achievements
	static void registerAchievements();
	//load statistics file.
	void loadFile(const std::string& fileName);
	//save statistics file.
	void saveFile(const std::string& fileName);
	//add or display a new achievement.
	//name: the achievement id. if can't find it in avaliable achievement, nothing happens.
	//save: if true then save to currently owned achievements. if it already exists in
	//currently owned achievements, nothing happens.
	//if false then just added it to queue, including duplicated achievements.
	void newAchievement(const std::string& id,bool save=true);
	//if there are new achievements, draw it on the screen,
	//otherwise do nothing.
	void render();

	//Call this function to update completed levels.
	//Note: Level progress files are reloaded, so it's slow.
	void reloadCompletedLevelsAndAchievements();

	//Call this function to update other achievements at game startup.
	void reloadOtherAchievements();

	//Update level specified achievements.
	//Make sure the completed level count is correct.
	void updateLevelAchievements();

	//Update tutorial specified achievements.
	//Make sure the level progress of tutorial is correct.
	void updateTutorialAchievements();

	//Call when level edit is start
	void startLevelEdit();

	//Call when level edit is end
	void endLevelEdit();

	//update in-game time
	void updatePlayTime();

	//create a SDL_Surface contains specified achievements or draw to existing surface.
	//info: achievement info.
	//surface: specifies SDL_Surface to draw on. if NULL then new surface will be created.
	//rect [in, out, optional]: specifies position and optionally width to draw on. height will be returned.
	// if NULL then will be drawn on top-left corner. if surface is NULL then rect->x and rect->y are ignored.
	//showTip: shows "New achievement" tip
	//achievedTime: if we should show achieved time (and progress bar if AchievementInfo specifies) and when is it.
	// Note: if showTip=true then this argument does nothing.
	//return value: SDL_Surface contains specified achievements or NULL if any error occured.
	SDL_Surface* createAchievementSurface(AchievementInfo* info,SDL_Surface* surface=NULL,SDL_Rect* rect=NULL,bool showTip=true,const time_t *achievedTime=NULL);
	private:
	//internal function
	//flags: a bit-field value indicates which achievements we have.
	void updateTutorialAchievementsInternal(int flags);
	//internal function. alpha should be 1-5, 5 means fully opaque (not really)
	void drawAchievement(int alpha);
	//internal function for get progress (in percent, 0-100)
	float getAchievementProgress(AchievementInfo* info);
	};

	extern StatisticsManager statsMgr;
	extern AchievementInfo achievementList[];

	#endif

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