/*
 * Copyright (C) 2019 Weber Yann
 * 
 * This file is part of PyFCGI.
 * 
 * PyFCGI is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 * 
 * PyFCGI 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with PyFCGI.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __CONF_H___
#define __CONF_H___

#include <unistd.h>
#include <getopt.h>
#include <sys/types.h>
#include <sys/wait.h>

#include "config.h"
/**@defgroup conf_internal PYFCGI configuration handling
 */
/**@defgroup conf_glob PYFCGI global (for all process) configurations
 * @see struct_pyfcgi_conf_s
 * @ingroup conf_internal */

#include "logger.h"
#include "pyutils.h"

/**@defgroup ret_status Function & process return status
 */
#define PYFCGI_ERR 16
/**@ingroup ret_status */
#define PYFCGI_WORKER_FAIL 32
/**@ingroup ret_status */
#define PYFCGI_MASTER_FAIL 64
/**@ingroup ret_status */
#define PYFCGI_FATAL 128

#define PYFCGI_NAME "spawn-fcgi [OPTIONS] -- pyfcgi"

#define PYFCGI_SHORT_OPT "Ce:E:w:W:m:l:Svh"

#define PYFCGI_LONG_OPT { \
	{"config", required_argument, 0, 'C'},\
	{"pymodule", required_argument, 0, 'e'},\
	{"pyapp", required_argument, 0, 'E'},\
	{"min-worker", required_argument, 0, 'w'},\
	{"max-worker", required_argument, 0, 'W'},\
	{"max-request", required_argument, 0, 'm'},\
	{"log", required_argument, 0, 'L'},\
	{"syslog", no_argument, 0, 'S'},\
	{"pid-file", required_argument, 0, 'P'},\
	{"version", no_argument, 0, 'v'},\
	{"help", no_argument, 0, 'h' },\
	{0, 0, 0, 0}\
}

#define PYFCGI_OPT_HELP {\
	{"Load options from configuration file", "CONFIG"},\
	{"Search application function in given python module", "MODULE_NAME"},\
	{"Python application entrypoint function name", "FUNC_NAME"},\
	{"Minimum worker in the pool", "INT"},\
	{"Maximum worker in the pool", "INT"},\
	{"Request count after wich the worker is restarted (if 0 never restart)", "INT"},\
	{"Add a logfile using syntax : 'LOGFILE[;FILT][;FMT]'", "LOGGER_SPEC"},\
	{"Use syslog for logging", NULL},\
	{"Create a PID file", "FILENAME"},\
	{"Print PyFCGI and Python version and exit", NULL},\
	{"Display this help and exit", NULL},\
}

#define PYFCGI_HELP_TEXT "Logger specification format 'LOGFILE[;FILT][;FMT]' with :\n\
\t- LOGFILE the log file name\n\
\t- FILT a number (in decimal or hexadicimal 0xXX) indicating wich\n\
\t  facility/level to log\n\
\t- FMT the logline format in a special markup format using fields between { }\n\
\t  supported fields are :\n\
\t\t- {datetime} {datetime:SIZE} {datetime:SIZE:FMT} defines a format and a \n\
\t\t  constant length for a datetime field. Default : {datetime:25:%F %T%z}\n\
\t\t- {level} the loglevel \n\
\t\t- {facility} the log facility\n\
\t\t- {pid} the process PID\n\
\t\t- {ident} the defined ident (set by process)\n\
\t\t- {msg} the log message (can only appear once)\n\
You can escape { and } by using {{ and }} and all field names can by\n\
abbreviated to one character.\n"

#define PYENTRY_DEFAULT_FUN "application"

/**@brief Friendly name for @ref struct pyfcgi_conf_s
 * @see struct pyfcgi_conf_s */
typedef struct pyfcgi_conf_s pyfcgi_conf_t;
typedef struct pyfcgi_conf_logger_s pyfcgi_conf_logger_t;
typedef struct pyfcgi_context_s pyfcgi_context_t;

struct pyfcgi_context_s {
	pid_t pid;
	pid_t ppid;
	char *pidfile;
};

/**@brief Structure containing configuration
 * @ingroup conf_internal
 * The structure is used for the global @ref pyfcgi_conf variable.
 * @see pyfcgi_conf_t
 */
struct pyfcgi_conf_s
{
	/**@brief Entrypoint module name
	 * @ingroup conf_glob */
	char *py_entrymod;
	/**@brief Entrypoint function name
	 * @ingroup conf_glob */
	char *py_entryfun;
	/**@brief Minimum count worker in pool
	 * @ingroup conf_glob */
	int min_wrk;
	/**@brief Maximum count workers in pool
	 * @ingroup conf_glob */
	int max_wrk;
	/**@brief Maximum request before a worker restarts (0 for no restart)
	 * @ingroup conf_glob */
	int max_reqs;

	/**@brief Logger configuration
	 * @ingroupe conf_glob */
	pyfcgi_conf_logger_t logs;

	/**@brief Context informations */
	pyfcgi_context_t context;
};


/**@brief Configuration globals, inherited from parent to childs */
pyfcgi_conf_t PyFCGI_conf;

/**@brief Print usage on FD 2 (stdout) */
void usage();

/**@brief Print pyfcgi & python version on given fd */
void print_version(int);

/**@brief Init conf with default values */
void default_conf();

/**@brief Parse arguments and store them in conf
 * @return 0 if no error */
int parse_args(int argc, char *argv[]);

int check_entrypoint_import();

int parse_optlog(const char*);

#endif