/*
    Copyright (C) 2005-2009  Michel de Boer <michel@twinklephone.com>

    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, see <https://www.gnu.org/licenses/>.
*/

#ifndef _SYS_SETTINGS_H
#define _SYS_SETTINGS_H

#include <cstdlib>
#include <string>
#include <list>
#include "parser/sip_message.h"
#include "sockets/url.h"
#include "threads/mutex.h"
#include "twinkle_config.h"

using namespace std;

/** @name General system settings */
//@{
/** User directory, relative to the home directory ($HOME) */
#define DIR_USER	".twinkle"

/** Home directory */
#define DIR_HOME	(getenv("HOME"))

/** Directory for storing temporary files, relative to @ref DIR_USER */
#define DIR_TMPFILE	"tmp"

/** Device file for DSP */
#define DEV_DSP		"/dev/dsp"

/** Device prefixes in settings file */
#define PFX_OSS		"oss:"
#define PFX_ALSA	"alsa:"

/** ALSA default device */
#define DEV_ALSA_DFLT	"alsa:default"

/** Device string for other device */
#define DEV_OTHER	"other device"

/** File with SIP providers for the wizard */
#define FILE_PROVIDERS	"providers.csv"

/** File with CLI command history */
#define FILE_CLI_HISTORY "twinkle.history"
//@}


/** Audio device */
class t_audio_device {
public:
	enum t_audio_device_type {
		OSS, ALSA
	} type;
	string		device; 	// eg. /dev/dsp, /dev/dsp1 for OSS or hw:0,0 for ALSA
	string		sym_link;	// real device if the device is a symbolic link
	string		name;		// name of the sound card

	// Get a one-line description
	string get_description(void) const;
	
	// Get string to be written in settings file
	string get_settings_value(void) const;
};

/** Window geometry */
struct t_win_geometry {
	int x;		/**< x-coordinate of top left corner */
	int y;		/**< y-coordinate of top left corner */
	int width;	/**< Window width */
	int height;	/**< Window height */
	
	/** Constructor */
	t_win_geometry();
	
	/** Constructor */
	t_win_geometry(int x_, int y_, int width_, int height_);
	
	/**
	 * Construct a geometry from an encoded string.
	 * If the string cannot be parsed, all values are set to zero.
	 * @param value [in] Encoded string "x,y,widht,height"
	 */
	t_win_geometry(const string &value);
	
	/**
	 * Encode geometry into a string.
	 * @return Encoded geometry "x,y,width,height"
	 */
	string encode(void) const;
};

/** System settings */
class t_sys_settings {
private:
	// Mutex to avoid sync concurrent access
	mutable t_recursive_mutex	mtx_sys;
	
	/** File descriptor of lock file */
	int fd_lock_file;
	
	// Share directory for files applicable to all users
	string		dir_share;
	
	// Full file name for config file
	string		filename;
	
	/** The SIP port that is currently used */
	unsigned short	active_sip_port;
	
	// Sound devices
	t_audio_device		dev_ringtone;
	t_audio_device		dev_speaker;
	t_audio_device		dev_mic;
	
	// Indicates if audio devices should be validated before
	// usage.
	bool			validate_audio_dev;
	
	int			alsa_play_period_size;
	int			alsa_capture_period_size;
	int			oss_fragment_size;
	
	// Log file settings
	unsigned short	log_max_size; // in MB
	bool		log_show_sip;
	bool		log_show_stun;
	bool		log_show_memory;
	bool		log_show_debug;
	
	/** @name GUI settings */
	//@{
	bool		gui_use_systray;
	bool		gui_hide_on_close;
	
	/** Show popup on incoming call */
	bool		gui_show_incoming_popup;
	
	/** Show main window on incoming call after a few seconds */
	bool		gui_auto_show_incoming;
	int		gui_auto_show_timeout;
	bool		gui_show_call_osd;
	
	/** Command to start an internet browser */
	string		gui_browser_cmd;
	//@}
	
	// Address book settings
	bool		ab_show_sip_only;
	bool		ab_lookup_name;
	bool		ab_override_display;
	bool		ab_lookup_photo;
	
	// Call history settings
	int		ch_max_size; // #calls
	
	// Service settings
	// Call waiting allows an incoming call if one line is busy.
	bool		call_waiting;
	
	// Indicates if both lines should be hung up when ending a
	// 3-way conference call.
	// If false, then only the active line will be hung up.
	bool		hangup_both_3way;
	
	// Startup settings
	list<string>	start_user_profiles;

	bool		start_hidden;
	
	/** The full path name of the shared mime database */
	string		mime_shared_database;
	
	/** @name Network settings */
	//@{
	/** Port for sending and receiving SIP messages. This is the value
	 * written in the system settings file. This value can differ from
	 * active_sip_port value if the user changed the system
	 * settings while Twinkle is running.
	 */
	unsigned short	config_sip_port;
	
	/** SIP UDP port overridden by the command options. */
	unsigned short	override_sip_port;
	
	/** Port for RTP.
	 * rtp_port is the base port for RTP streams. Each phone line
	 * uses has its own RTP port number.
	 * line x has RTP port = rtp_port + x * 2 and
	 *           RTCP port = rtp_port + x * 2 + 1
	 * Where x starts at 0
	 *
	 * NOTE: for call transfer scenario, line 2 (3rd line) is used
	 *       which is not a line that is visible to the user. The user
	 *       only sees 2 lines for its use. By having a dedicated port
	 *       for line 2, the  RTP stream for a referred call uses another
	 *       port than the RTP stream for an original call, preventing
	 *       the RTP streams for these calls to become mixed.
	 *
	 * NOTE: during a call transfer, line 2 will be swapped with another
	 *       line, so the ports swap accordingly.
	 */
	unsigned short	rtp_port;
	
	/** RTP port overridden by the command options. */
	unsigned short	override_rtp_port; 
	
	/** Maximum size of a SIP message received over UDP. */
	unsigned short	sip_max_udp_size;
	
	/** Maximum size of a SIP message received over TCP. */
	unsigned long	sip_max_tcp_size;
	//@}
	
	// Ring tone settings
	bool		play_ringtone;
	string		ringtone_file;
	bool		play_ringback;
	string		ringback_file;
	
	// Persistent storage for user interface state
	// The profile that was last used before Twinkle was terminated.
	string		last_used_profile;
	
	// Call information for redial last call function
	t_url		redial_url;
	string		redial_display;
	string		redial_subject;
	string		redial_profile; // profile used to make the call
	bool		redial_hide_user; // Did the user request hiding?
	
	// History of latest dialed addresses
	list<string>	dial_history;
	
	/** @name GUI view settings */
	//@{
	bool		show_display;
	bool		compact_line_status;
	bool		show_buddy_list;
	//@}
	
	/** @name Settings to restore a previous user interface session after system shutdown */
	//@{
	/** ID of previous session */
	string		ui_session_id;
	
	/** Active user profiles */
	list<string>	ui_session_active_profiles;
	
	/** Geometry of main window */
	t_win_geometry	ui_session_main_geometry;
	
	/** Flag to indicate if the main window is hidden. */
	bool		ui_session_main_hidden;
	
	/** Window state of main window. */
	unsigned int	ui_session_main_state;
	//@}
	
	// One time warnings
	bool		warn_hide_user; // Warn use that provider may not support hiding.
	
public:
	/** Constructor */
	t_sys_settings();
	
	/** @name Getters */
	//@{
	t_audio_device get_dev_ringtone(void) const;
	t_audio_device get_dev_speaker(void) const;
	t_audio_device get_dev_mic(void) const;
	bool get_validate_audio_dev(void) const;
	int get_alsa_play_period_size(void) const;
	int get_alsa_capture_period_size(void) const;
	int get_oss_fragment_size(void) const;
	unsigned short get_log_max_size(void) const;
	bool get_log_show_sip(void) const;
	bool get_log_show_stun(void) const;
	bool get_log_show_memory(void) const;
	bool get_log_show_debug(void) const;
	bool get_gui_use_systray(void) const;
	bool get_gui_hide_on_close(void) const;
	bool get_gui_show_incoming_popup(void) const;
	bool get_gui_auto_show_incoming(void) const;
	int get_gui_auto_show_timeout(void) const;
	string get_gui_browser_cmd(void) const;
	bool get_gui_show_call_osd() const;
	bool get_ab_show_sip_only(void) const;
	bool get_ab_lookup_name(void) const;
	bool get_ab_override_display(void) const;
	bool get_ab_lookup_photo(void) const;
	int get_ch_max_size(void) const;
	bool get_call_waiting(void) const;
	bool get_hangup_both_3way(void) const;
	list<string> get_start_user_profiles(void) const;
	bool get_start_hidden(void) const;
	unsigned short get_config_sip_port(void) const;
	unsigned short get_rtp_port(void) const;
	unsigned short get_sip_max_udp_size(void) const;
	unsigned long get_sip_max_tcp_size(void) const;
	bool get_play_ringtone(void) const;
	string get_ringtone_file(void) const;
	bool get_play_ringback(void) const;
	string get_ringback_file(void) const;
	string get_last_used_profile(void) const;
	t_url get_redial_url(void) const;
	string get_redial_display(void) const;
	string get_redial_subject(void) const;
	string get_redial_profile(void) const;
	bool get_redial_hide_user(void) const;
	list<string> get_dial_history(void) const;
	bool get_show_display(void) const;
	bool get_compact_line_status(void) const;
	bool get_show_buddy_list(void) const;
	string get_ui_session_id(void) const;
	list<string> get_ui_session_active_profiles(void) const;
	t_win_geometry get_ui_session_main_geometry(void) const;
	bool get_ui_session_main_hidden(void) const;
	unsigned int get_ui_session_main_state(void) const;
	bool get_warn_hide_user(void) const;
	string get_mime_shared_database(void) const;
	//@}
	
	/** @name Setters */
	//@{
	void set_dev_ringtone(const t_audio_device &dev);
	void set_dev_speaker(const t_audio_device &dev);
	void set_dev_mic(const t_audio_device &dev);
	void set_validate_audio_dev(bool b);
	void set_alsa_play_period_size(int size);
	void set_alsa_capture_period_size(int size);
	void set_oss_fragment_size(int size);
	void set_log_max_size(unsigned short size);
	void set_log_show_sip(bool b);
	void set_log_show_stun(bool b);
	void set_log_show_memory(bool b);
	void set_log_show_debug(bool b);
	void set_gui_use_systray(bool b);
	void set_gui_hide_on_close(bool b);
	void set_gui_show_incoming_popup(bool b);
	void set_gui_auto_show_incoming(bool b);
	void set_gui_auto_show_timeout(int timeout);
	void set_gui_browser_cmd(const string &s);
	void set_gui_show_call_osd(bool b);
	void set_ab_show_sip_only(bool b);
	void set_ab_lookup_name(bool b);
	void set_ab_override_display(bool b);
	void set_ab_lookup_photo(bool b);
	void set_ch_max_size(int size);
	void set_call_waiting(bool b);
	void set_hangup_both_3way(bool b);
	void set_start_user_profiles(const list<string> &profiles);
	void set_start_hidden(bool b);
	void set_config_sip_port(unsigned short port);
	void set_override_sip_port(unsigned short port);
	void set_rtp_port(unsigned short port);
	void set_override_rtp_port(unsigned short port);
	void set_sip_max_udp_size(unsigned short size);
	void set_sip_max_tcp_size(unsigned long size);
	void set_play_ringtone(bool b);
	void set_ringtone_file(const string &file);
	void set_play_ringback(bool b);
	void set_ringback_file(const string &file);
	void set_last_used_profile(const string &profile);
	void set_redial_url(const t_url &url);
	void set_redial_display(const string &display);
	void set_redial_subject(const string &subject);
	void set_redial_profile(const string &profile);
	void set_redial_hide_user(bool b);
	void set_dial_history(const list<string> &history);
	void set_show_display(bool b);
	void set_compact_line_status(bool b);
	void set_show_buddy_list(bool b);
	void set_ui_session_id(const string &id);
	void set_ui_session_active_profiles(const list<string> &profiles);
	void set_ui_session_main_geometry(const t_win_geometry &geometry);
	void set_ui_session_main_hidden(bool hidden);
	void set_ui_session_main_state(unsigned int state);
	void set_warn_hide_user(bool b);
	void set_mime_shared_database(const string &filename);
	//@}
	
	/** 
	 * Get "about" text.
	 * @param html [in] Indicates if "about" text must be in HTML format.
	 * @return The "about" text"
	 */
	string about(bool html) const;
	
	/**
	 * Get produce release date.
	 * @return product release date in locale format
	 */
	string get_product_date(void) const;
	
	/** 
	 * Get a string of options that are built, e.g. ALSA, KDE
	 * @return The string of options.
	 */
	string get_options_built(void) const;

	/** 
	 * Check if the environment of the machine satisfies all requirements.
	 * @param error_msg [out] User readable error message when false is returned.
	 * @return true if all requirements are met.
	 * @return false, otherwise and error_msg contains an appropriate
	 * error message to show the user.
	 */
	bool check_environment(string &error_msg) const;

	/**
	 * Set the share directory
	 * @param dir [in] Absolute path of the share directory.
	 */ 
	void set_dir_share(const string &dir);

	/**
	 * Get the share directory.
	 * @return Absolute path of the directory with shared files.
	 */
	string get_dir_share(void) const;
	
	/**
	 * Get the directory containing language translation files.
	 * @return Absolute path of the language directory.
	 */
	string get_dir_lang(void) const;
	
	/**
	 * Get the user directory.
	 * @return Absolute path of the user directory.
	 */
	string get_dir_user(void) const;
	
	/**
	 * Get the CLI command history file.
	 * @return Full pathname of the history file.
	 */
	string get_history_file(void) const;
	
	/** 
	 * Get the temporary file directory.
	 * @return The full pathname of the temporary file directory.
	 */
	string get_dir_tmpfile(void) const;
	
	/**
	 * Check if a file is located in the temporary file directory.
	 * @return true if the file is in the temporary file directory, false otherwise.
	 */
	bool is_tmpfile(const string &filename) const;
	
	/**
	 * Save data to a temporary file.
	 * @param data [in] Data to save.
	 * @param file_extension [in] Extension (glob) for file name.
	 * @param filename [out] File name of save file, relative to the tmp directory.
	 * @param error_msg [out] If saving failed, then this parameter contains an
	 *        error message.
	 * @return true if saving succeeded, false otherwise.
	 */
	bool save_tmp_file(const string &data, const string &file_extension,
		string &filename, string &error_msg);
		
	/**
	 * Save the body of a SIP message to a temporary file.
	 * @param sip_msg [in] The SIP message from which the body must be saved.
	 * @param suggested_file_extension [in] File extension (glob) for file name to save
	 *        if an extension cannot be determined from a filename supplied as
	 *        in the Content-Disposition header.
	 * @param tmpname [out] The name of the saved file.
	 * @param save_as_name [out] Suggested file name for user for saving.
	 * @param error_msg [out] Error message when saving failed.
	 * @return true if saving succeeded, false otherwise.
	 */
	bool save_sip_body(const t_sip_message &sip_msg,
		const string &suggested_file_extension,
		string &tmpname, string &save_as_name, string &error_msg);
		
	/** Remove all files from the temporary file directory */
	void remove_all_tmp_files(void) const;

	/** @name Lock file operations */
	/**
	 * Create a lock file if it does not exist yet and take a file lock on it.
	 * @param shared_lock [in] Indicates if the file lock must be shared or exclusive.
	 *        A shared lock is needed when the users forces multiple Twinkle processes
	 *        to run.
	 * @param error_msg [out] Error message if the operation fails.
	 * @param already_running [out] If the operation fails, this flag indicates Twinkle
	 *        is already running.
	 * @return True if the file is locked successfully.
	 * @return False if the file could not be locked.
	 */
	bool create_lock_file(bool shared_lock, string &error_msg, bool &already_running);
	
	/** Unlock the lock file. */
	void delete_lock_file(void);
	
	// Read and parse a config file into the t_sys_settings object.
	// Returns false if it fails. error_msg is an error message that can
	// be give to the user.
	bool read_config(string &error_msg);

	// Write the settings into a config file
	bool write_config(string &error_msg);
	
	// Get all OSS devices
	list<t_audio_device> get_oss_devices(bool playback) const;
	
#ifdef HAVE_LIBASOUND
	// Get all ALSA devices
	list<t_audio_device> get_alsa_devices(bool playback) const;
#endif
	
	// Get all audio devices
	list<t_audio_device> get_audio_devices(bool playback) const;
	
	// Check if two OSS devices are equal
	bool equal_audio_dev(const t_audio_device &dev1, const t_audio_device &dev2) const;
	
	static t_audio_device audio_device(string device = "");
	
	// Check validate the audio devices flagged as true.
	// If audio validation is turned off then always true is returned.
	bool exec_audio_validation(bool ringtone, bool speaker, bool mic, 
		string &error_msg) const;
	
	// Get the active value of the SIP UDP port
	// Once the SIP UDP port is retrieved from the system settings, it
	// is stored as the active port. A next call to get_sip_port
	// returns the active port, even when the SIP UDP port in the settings
	// has changed.
	// If force_active == true, then always the SIP UDP port is returned
	// and made active
	unsigned short get_sip_port(bool force_active = false);
};

extern t_sys_settings *sys_config;

#endif