/*
 * Copyright (C) 2009 Matthew Gates
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifndef _SATELLITES_HPP_
#define _SATELLITES_HPP_ 1

#include "StelObjectModule.hpp"
#include "Satellite.hpp"
#include "StelFader.hpp"
#include "StelGui.hpp"
#include "StelDialog.hpp"
#include "StelLocation.hpp"

#include <QDateTime>
#include <QSharedPointer>

class StelButton;
class Planet;
class QNetworkAccessManager;
class QNetworkReply;
class QPixmap;
class QProgressBar;
class QSettings;
class QTimer;
class SatellitesDialog;

typedef QSharedPointer<Satellite> SatelliteP;

//! @class Satellites
//! Satellites in low Earth orbith require different orbital calculations from planets, the moon
//! and so on.  This plugin implements the SGP4/SDP4 algorithms in Stellarium, allowing accurate
//! prediction of the position of artificial satellites.
class Satellites : public StelObjectModule
{
	Q_OBJECT
public:
	//! @enum UpdateState
	//! Used for keeping track of the download/update status
	enum UpdateState
	{
		Updating,             //!< Update in progress
		CompleteNoUpdates,    //!< Update completed, there we no updates
		CompleteUpdates,      //!< Update completed, there were updates
		DownloadError,        //!< Error during download phase
		OtherError            //!< Other error
	};

	enum Visibility
	{
		Visible,
		NotVisible,
		Both
	};

	Satellites();
	virtual ~Satellites();

	///////////////////////////////////////////////////////////////////////////
	// Methods defined in the StelModule class
	virtual void init();
	virtual void deinit();
	virtual void update(double deltaTime);
	virtual void draw(StelCore* core);
	virtual void drawPointer(StelCore* core, StelPainter& painter);
	virtual void setStelStyle(const QString& section);
	virtual double getCallOrder(StelModuleActionName actionName) const;

	///////////////////////////////////////////////////////////////////////////
	// Methods defined in StelObjectManager class
	//! Used to get a list of objects which are near to some position.
	//! @param v a vector representing the position in th sky around which to search for nebulae.
	//! @param limitFov the field of view around the position v in which to search for satellites.
	//! @param core the StelCore to use for computations.
	//! @return an list containing the satellites located inside the limitFov circle around position v.
	virtual QList<StelObjectP> searchAround(const Vec3d& v, double limitFov, const StelCore* core) const;

	//! Return the matching satellite object's pointer if exists or NULL.
	//! @param nameI18n The case in-sensistive satellite name
	virtual StelObjectP searchByNameI18n(const QString& nameI18n) const;

	//! Return the matching satellite if exists or NULL.
	//! @param name The case in-sensistive standard program name
	virtual StelObjectP searchByName(const QString& name) const;

	//! Find and return the list of at most maxNbItem objects auto-completing the passed object I18n name.
	//! @param objPrefix the case insensitive first letters of the searched object
	//! @param maxNbItem the maximum number of returned object names
	//! @return a list of matching object name by order of relevance, or an empty list if nothing match
	virtual QStringList listMatchingObjectsI18n(const QString& objPrefix, int maxNbItem=5) const;

	//! Implment this to tell the main Stellarium GUi that there is a GUI element to configure this
	//! plugin. 
	virtual bool configureGui(bool show=true);

	//! Set up the plugin with default values.  This means clearing out the Satellites section in the
	//! main config.ini (if one already exists), and populating it with default values.  It also 
	//! creates the default satellites.json file from the resource embedded in the plugin lib/dll file.
	void restoreDefaults(void);

	//! Read (or re-read) settings from the main config file.  This will be called from init and also
	//! when restoring defaults (i.e. from the configuration dialog / restore defaults button).
	void readSettingsFromConfig(void);

	//! Get a list of satellite group names.  A Satellite may be long to one or more group
	//! e.g. "amateur" and "navigation".  Group names are arbitrary strings defined in the 
	//! json file.  Think of them like tags.  A satellite may not belong to any group at all.
	QStringList getGroups(void) const;

	//! get satellite objects filtered by group.  If an empty string is used for the
	//! group name, return all satallites
	QStringList getSatellites(const QString& group=QString(), Visibility vis=Both);

	//! get a satellite object by identifier
	SatelliteP getByID(const QString& id);

	//! get whether or not the plugin will try to update TLE data from the internet
	//! @return true if updates are set to be done, false otherwise
	bool getUpdatesEnabled(void) {return updatesEnabled;}
	//! set whether or not the plugin will try to update TLE data from the internet
	//! @param b if true, updates will be enabled, else they will be disabled
	void setUpdatesEnabled(bool b) {updatesEnabled=b;}

	//! get the date and time the TLE elements were updated
	QDateTime getLastUpdate(void) {return lastUpdate;}

	//! get the update frequency in hours
	int getUpdateFrequencyHours(void) {return updateFrequencyHours;}
	void setUpdateFrequencyHours(int hours) {updateFrequencyHours = hours;}

	//! get the number of seconds till the next update
	int getSecondsToUpdate(void);

	//! get the update frequency in hours
	//void setUpdateFrequencyHours(int hours);

	//! Get the current updateState
	UpdateState getUpdateState(void) {return updateState;}

	//! Get a list of URLs which are sources of TLE data.
	QStringList getTleSources(void) {return updateUrls;}

	//! Set the list of URLs which are sources of TLE data.
	void setTleSources(QStringList tleSources);
	
	//! Returns the module-specific style sheet.
	//! The main StelStyle instance should be passed.
	const StelStyle getModuleStyleSheet(const StelStyle& style);

signals:
	//! emitted when the update status changes, e.g. when 
	//! an update starts, completes and so on.  Note that
	//! on completion of an update, TleUpdateComplete is also
	//! emitted with the number of updates done.
	//! @param state the new update state.
	void updateStateChanged(Satellites::UpdateState state);

	//! emitted after a TLE update has run.
	//! @param updates the number of satellites updated.
	void TleUpdateComplete(int updates);
	

public slots:
	void setFlagHints(bool b) {hintFader=b;}
	bool getFlagHints(void) {return hintFader;}

	//! get the label font size
	//! @return the pixel size of the font
	int getLabelFontSize(void) {return labelFont.pixelSize();}
	//! set the label font size
	//! @param size the pixel size of the font
	void setLabelFontSize(int size) {labelFont.setPixelSize(size);}

	bool getFlagLabels(void);
	void setFlagLabels(bool b);

	//! Download TLEs from web recources described in the module section of the
	//! module.ini file and update the TLE values for any satellites for which
	//! there is new TLE data.
	void updateTLEs(void);

private:
	// if existing, delete Satellites section in main config.ini, then create with default values
	void restoreDefaultConfigIni(void);

	// replace the json file with the default from the compiled-in resource
	void restoreDefaultJsonFile(void);

	// read the json file and create the satellites.  Removes existing satellites first if there are any
	// this will be done once at init, and also if the defaults are reset.
	// @return the number of satellites read from the json file
	int readJsonFile(void);

	QString satellitesJsonPath;
	QList<SatelliteP> satellites;
	LinearFader hintFader;
	StelTextureSP texPointer;
	QPixmap* pxmapGlow;
	QPixmap* pxmapOnIcon;
	QPixmap* pxmapOffIcon;
	StelButton* toolbarButton;
	QSharedPointer<Planet> earth;
	Vec3f defaultHintColor;
	QFont labelFont;
	
	// variables and functions for the updater
	UpdateState updateState;
	QNetworkAccessManager* downloadMgr;
	QStringList updateUrls;
	QStringList updateFiles;
	QProgressBar* progressBar;
	int currentUpdateUrlIdx;
	int numberDownloadsComplete;
	QTimer* updateTimer;
	bool updatesEnabled;
	QDateTime lastUpdate;
	int updateFrequencyHours;
	void updateFromFiles(void);

	// GUI
	SatellitesDialog* configDialog;
	QByteArray normalStyleSheet;
	QByteArray nightStyleSheet;

private slots:
	//! check to see if an update is required.  This is called periodically by a timer
	//! if the last update was longer than updateFrequencyHours ago then the update is
	//! done.
	void checkForUpdate(void);
	void updateDownloadComplete(QNetworkReply* reply);
	void observerLocationChanged(StelLocation loc);

};


#include "fixx11h.h"
#include <QObject>
#include "StelPluginInterface.hpp"

//! This class is used by Qt to manage a plug-in interface
class SatellitesStelPluginInterface : public QObject, public StelPluginInterface
{
	Q_OBJECT
	Q_INTERFACES(StelPluginInterface)
public:
	virtual StelModule* getStelModule() const;
	virtual StelPluginInfo getPluginInfo() const;
};

#endif /*_SATELLITES_HPP_*/