/**
 * @file
 * Copyright 2014 (c) Anna Schumaker.
 */
#ifndef OCARINA_CORE_TAGS_TRACK_H
#define OCARINA_CORE_TAGS_TRACK_H

#include <core/tags/generic.h>
#include <core/tags/artist.h>
#include <core/tags/album.h>
#include <core/tags/genre.h>
#include <core/tags/library.h>


/**
 * Track fields that can be compared.
 */
enum sort_t {
	/** Artist name */
	SORT_ARTIST,
	/** Album name */
	SORT_ALBUM,
	/** Play count */
	SORT_COUNT,
	/** Genre */
	SORT_GENRE,
	/** Track length */
	SORT_LENGTH,
	/** Date the track was last played */
	SORT_PLAYED,
	/** Track title */
	SORT_TITLE,
	/** Track number */
	SORT_TRACK,
	/** Track year */
	SORT_YEAR,
};


class Track : public GenericTag {
private:
	Artist  *_artist;  /**< Pointer to the Artist performing this track.  */
	Library *_library; /**< Pointer to the Library containing this track. */

	void set_length_str();

public:
	/** Pointer to this track's album information */
	Album   *album;
	/** Pointer to this track's genre information */
	Genre   *genre;

	/** Track number of this track */
	unsigned int track;
	/** Length of this track (in seconds) */
	unsigned int length;
	/** The number of times this track has been played */
	unsigned int play_count;
	/** The year this track was last played */
	unsigned int last_year;
	/** The month this track was last played */
	unsigned int last_month;
	/** The day this track was last played */
	unsigned int last_day;

	/** The title of this track */
	std :: string title;
	/** The title of this track (in lowercase) */
	std :: string title_lower;
	/** The filepath of this track, relative to the library root */
	std :: string filepath;
	/** The length of this track in a human readable string */
	std :: string length_str;

	/** Track constructor */
	Track();

	/**
	 * Track constructor
	 *
	 * @param  artist   The artist performing this track.
	 * @param  library  The library containing this track.
	 */
	Track(Artist *, Library *);

	/**
	 * Track constructor
	 * @param  filepath  Filepath of the track
	 * @param  library  Library containing the track
	 */
	Track(const std::string &, Library *);

	/** Track destructor */
	~Track();


	Artist  *artist();  /**< @return Track::_artist.  */
	Library *library(); /**< @return Track::_library. */


	/**
	 * Called to access a track's primary key
	 * @return The full path of the track
	 */
	const std::string primary_key() const;

	/**
	 * Read track data from file
	 * @param  file  The file to read from
	 */
	void read(File &);

	/**
	 * Write track data to file
	 * @param  file  The file to write to
	 */
	void write(File &);


	/**
	 * Read the tags associated with this track
	 * @return True on success
	 */
	bool tag();

	/** @return The full path of this track */
	const std::string path() const;

	/** Increments play count and sets date-last-played information. */
	void played();

	/**
	 * Compare two tracks based on a specific field.
	 * @param  rhs  The other track to compare.
	 * @param  field  The field to compare.
	 * @return 0 if lhs == rhs
	 * @return < 0 if lhs < rhs, or rhs is NULL
	 * @return > 0 if lhs > rhs
	 */
	int less_than(Track *, sort_t);
};

#endif /* OCARINA_CORE_TAGS_TRACK_H */