/*
The MIT License (MIT)

Copyright (c) 2013 winlin

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#ifndef SRS_CORE_CONIFG_HPP
#define SRS_CORE_CONIFG_HPP

/*
#include <srs_core_config.hpp>
*/
#include <srs_core.hpp>

#include <vector>
#include <string>

#include <srs_core_reload.hpp>

// default vhost for rtmp
#define RTMP_VHOST_DEFAULT "__defaultVhost__"

#define SRS_CONF_DEFAULT_HLS_PATH "./objs/nginx/html"
#define SRS_CONF_DEFAULT_HLS_FRAGMENT 10
#define SRS_CONF_DEFAULT_HLS_WINDOW 60
// in ms, for HLS aac sync time.
#define SRS_CONF_DEFAULT_AAC_SYNC 100
// in ms, for HLS aac flush the audio
#define SRS_CONF_DEFAULT_AAC_DELAY 300

class SrsFileBuffer
{
public:
	int fd;
	int line;
	// start of buffer.
	char* start;
	// end of buffer.
	char* end;
	// current consumed position.
	char* pos;
	// last available position.
	char* last;
	
	SrsFileBuffer();
	virtual ~SrsFileBuffer();
	virtual int open(const char* filename);
};

class SrsConfDirective
{
public:
	int conf_line;
	std::string name;
	std::vector<std::string> args;
	std::vector<SrsConfDirective*> directives;
public:
	SrsConfDirective();
	virtual ~SrsConfDirective();
	std::string arg0();
	std::string arg1();
	std::string arg2();
	SrsConfDirective* at(int index);
	SrsConfDirective* get(std::string _name);
public:
	virtual int parse(const char* filename);
public:
	enum SrsDirectiveType{parse_file, parse_block};
	virtual int parse_conf(SrsFileBuffer* buffer, SrsDirectiveType type);
	virtual int read_token(SrsFileBuffer* buffer, std::vector<std::string>& args);
	virtual int refill_buffer(SrsFileBuffer* buffer, bool d_quoted, bool s_quoted, int startline, char*& pstart);
};

/**
* the config parser.
* for the config supports reload, so never keep the reference cross st-thread,
* that is, never save the SrsConfDirective* get by any api of config,
* for it maybe free in the reload st-thread cycle.
* you can keep it before st-thread switch, or simply never keep it.
*/
class SrsConfig
{
private:
	bool show_help;
	bool show_version;
	std::string config_file;
	SrsConfDirective* root;
	std::vector<SrsReloadHandler*> subscribes;
public:
	SrsConfig();
	virtual ~SrsConfig();
public:
	virtual int reload();
	virtual void subscribe(SrsReloadHandler* handler);
	virtual void unsubscribe(SrsReloadHandler* handler);
public:
	virtual int parse_options(int argc, char** argv);
public:
	virtual SrsConfDirective* get_vhost(std::string vhost);
	virtual bool    		  get_vhost_enabled(std::string vhost);
	virtual SrsConfDirective* get_transcode(std::string vhost, std::string scope);
	virtual bool    		  get_transcode_enabled(SrsConfDirective* transcode);
	virtual std::string		  get_transcode_ffmpeg(SrsConfDirective* transcode);
	virtual void 			  get_transcode_engines(SrsConfDirective* transcode, std::vector<SrsConfDirective*>& engines);
	virtual bool    		  get_engine_enabled(SrsConfDirective* engine);
	virtual std::string 	  get_engine_vcodec(SrsConfDirective* engine);
	virtual int		     	  get_engine_vbitrate(SrsConfDirective* engine);
	virtual double	     	  get_engine_vfps(SrsConfDirective* engine);
	virtual int		     	  get_engine_vwidth(SrsConfDirective* engine);
	virtual int		     	  get_engine_vheight(SrsConfDirective* engine);
	virtual int		     	  get_engine_vthreads(SrsConfDirective* engine);
	virtual std::string 	  get_engine_vprofile(SrsConfDirective* engine);
	virtual std::string 	  get_engine_vpreset(SrsConfDirective* engine);
	virtual void		 	  get_engine_vparams(SrsConfDirective* engine, std::vector<std::string>& vparams);
	virtual void		 	  get_engine_vfilter(SrsConfDirective* engine, std::vector<std::string>& vfilter);
	virtual std::string 	  get_engine_acodec(SrsConfDirective* engine);
	virtual int		     	  get_engine_abitrate(SrsConfDirective* engine);
	virtual int		     	  get_engine_asample_rate(SrsConfDirective* engine);
	virtual int		     	  get_engine_achannels(SrsConfDirective* engine);
	virtual void			  get_engine_aparams(SrsConfDirective* engine, std::vector<std::string>& aparams);
	virtual std::string 	  get_engine_output(SrsConfDirective* engine);
	virtual SrsConfDirective* get_gop_cache(std::string vhost);
	virtual SrsConfDirective* get_forward(std::string vhost);
	virtual SrsConfDirective* get_hls(std::string vhost);
	virtual bool    		  get_hls_enabled(std::string vhost);
	virtual SrsConfDirective* get_hls_path(std::string vhost);
	virtual SrsConfDirective* get_hls_fragment(std::string vhost);
	virtual SrsConfDirective* get_hls_window(std::string vhost);
	virtual SrsConfDirective* get_refer(std::string vhost);
	virtual SrsConfDirective* get_refer_play(std::string vhost);
	virtual SrsConfDirective* get_refer_publish(std::string vhost);
	virtual SrsConfDirective* get_listen();
	virtual SrsConfDirective* get_chunk_size();
	virtual SrsConfDirective* get_pithy_print_publish();
	virtual SrsConfDirective* get_pithy_print_forwarder();
	virtual SrsConfDirective* get_pithy_print_play();
private:
	virtual int parse_file(const char* filename);
	virtual int parse_argv(int& i, char** argv);
	virtual void print_help(char** argv);
};

/**
* deep compare directive.
*/
bool srs_directive_equals(SrsConfDirective* a, SrsConfDirective* b);

// global config
extern SrsConfig* config;

#endif