/*--------------------------------------------------------------------
 *
 *	Copyright (c) 1991-2020 by the GMT Team (https://www.generic-mapping-tools.org/team.html)
 *	See LICENSE.TXT file for copying and redistribution conditions.
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU Lesser General Public License as published by
 *	the Free Software Foundation; version 3 or 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 Lesser General Public License for more details.
 *
 *	Contact info: www.generic-mapping-tools.org
 *--------------------------------------------------------------------*/
/*
 * Author:	Paul Wessel
 * Date:	1-JAN-2010
 * Version:	6 API
 *
 * Brief synopsis: gmtdefaults will list the user's GMT default settings
 * or (by using the -D option), get the site GMT default settings.
 *
 */

#include "gmt_dev.h"

#define THIS_MODULE_CLASSIC_NAME	"gmtdefaults"
#define THIS_MODULE_MODERN_NAME	"gmtdefaults"
#define THIS_MODULE_LIB		"core"
#define THIS_MODULE_PURPOSE	"List current GMT default settings"
#define THIS_MODULE_KEYS	""
#define THIS_MODULE_NEEDS	""
#define THIS_MODULE_OPTIONS "-V"

/* Control structure for gmtdefaults */

struct GMTDEFAULTS_CTRL {
	struct GMTDEFAULTS_D {	/* -D[s|u] */
		bool active;
		char mode;
	} D;
};

static void *New_Ctrl (struct GMT_CTRL *GMT) {	/* Allocate and initialize a new control structure */
	struct GMTDEFAULTS_CTRL *C;

	C = gmt_M_memory (GMT, NULL, 1, struct GMTDEFAULTS_CTRL);
	return (C);
}

static void Free_Ctrl (struct GMT_CTRL *GMT, struct GMTDEFAULTS_CTRL *C) {	/* Deallocate control structure */
	if (!C) return;
	gmt_M_free (GMT, C);
}

static int usage (struct GMTAPI_CTRL *API, int level) {
	const char *name = gmt_show_name_and_purpose (API, THIS_MODULE_LIB, THIS_MODULE_CLASSIC_NAME, THIS_MODULE_PURPOSE);
	if (level == GMT_MODULE_PURPOSE) return (GMT_NOERROR);
	GMT_Message (API, GMT_TIME_NONE, "usage: %s [-D[s|u]]\n\n", name);

	if (level == GMT_SYNOPSIS) return (GMT_MODULE_SYNOPSIS);

	GMT_Message (API, GMT_TIME_NONE, "\t-D Print the current GMT default settings.\n");
	GMT_Message (API, GMT_TIME_NONE, "\t   Append s to print the SI version of the system defaults.\n");
	GMT_Message (API, GMT_TIME_NONE, "\t   Append u to print the US version of the system defaults.\n");
	GMT_Message (API, GMT_TIME_NONE, "\n\tALL settings will be written to standard output.\n");

	return (GMT_MODULE_USAGE);
}

static int parse (struct GMT_CTRL *GMT, struct GMTDEFAULTS_CTRL *Ctrl, struct GMT_OPTION *options) {
	/* This parses the options provided to gmtdefaults and sets parameters in CTRL.
	 * Any GMT common options will override values set previously by other commands.
	 * It also replaces any file names specified as input or output with the data ID
	 * returned when registering these sources/destinations with the API.
	 */

	unsigned int n_errors = 0, n_files = 0;
	struct GMT_OPTION *opt = NULL;

	for (opt = options; opt; opt = opt->next) {
		switch (opt->option) {

			case '<':	/* Count input files */
				n_files++;
				break;

			/* Processes program-specific parameters */

			case 'D':	/* Get GMT system-wide defaults settings */
				Ctrl->D.active = true;
				Ctrl->D.mode = opt->arg[0];
				break;
			case 'L':	/* List the user's current GMT defaults settings */
				if (gmt_M_compat_check (GMT, 4)) {
					GMT_Report (GMT->parent, GMT_MSG_COMPAT, "Option -L is deprecated; it is now the default behavior.\n");
				}
				else
					n_errors += gmt_default_error (GMT, opt->option);
				break;

			default:	/* Report bad options */
				n_errors += gmt_default_error (GMT, opt->option);
				break;
		}
	}

	n_errors += gmt_M_check_condition (GMT, n_files, "No input files are expected\n");

	return (n_errors ? GMT_PARSE_ERROR : GMT_NOERROR);
}

/* Must free allocated memory before returning */
#define bailout(code) {gmt_M_free_options (mode); return (code);}
#define Return(code) {Free_Ctrl (GMT, Ctrl); gmt_end_module (GMT, GMT_cpy); bailout (code);}

EXTERN_MSC void gmtinit_update_keys (struct GMT_CTRL *GMT, bool arg);

EXTERN_MSC int GMT_gmtdefaults (void *V_API, int mode, void *args) {
	int error;

	struct GMTDEFAULTS_CTRL *Ctrl = NULL;
	struct GMT_CTRL *GMT = NULL, *GMT_cpy = NULL;
	struct GMT_OPTION *options = NULL;
	struct GMTAPI_CTRL *API = gmt_get_api_ptr (V_API);	/* Cast from void to GMTAPI_CTRL pointer */

	/*----------------------- Standard module initialization and parsing ----------------------*/

	if (API == NULL) return (GMT_NOT_A_SESSION);
	if (mode == GMT_MODULE_PURPOSE) return (usage (API, GMT_MODULE_PURPOSE));	/* Return the purpose of program */
	options = GMT_Create_Options (API, mode, args);	if (API->error) return (API->error);	/* Set or get option list */

	if ((error = gmt_report_usage (API, options, 1, usage)) != GMT_NOERROR) bailout (error);	/* Give usage if requested */

	/* Parse the command-line arguments */

	if ((GMT = gmt_init_module (API, THIS_MODULE_LIB, THIS_MODULE_CLASSIC_NAME, THIS_MODULE_KEYS, THIS_MODULE_NEEDS, NULL, &options, &GMT_cpy)) == NULL) bailout (API->error); /* Save current state */
	if (GMT_Parse_Common (API, THIS_MODULE_OPTIONS, options)) Return (API->error);
	Ctrl = New_Ctrl (GMT);	/* Allocate and initialize a new control structure */
	if ((error = parse (GMT, Ctrl, options)) != 0) Return (error);

	/*---------------------------- This is the gmtdefaults main code ----------------------------*/

	if (Ctrl->D.active) {	/* Start with default params using SI settings */
		gmt_conf (GMT);		/* Get SI defaults */
		if (Ctrl->D.mode == 'u')
			gmt_conf_US (GMT);	/* Change a few to US defaults */
	}
	else
		gmt_getdefaults (GMT, NULL);	/* Get local GMT default settings (if any) [and PSL if selected] */

	/* To ensure that all is written to stdout we must set updated to true */

	gmtinit_update_keys (GMT, true);

	gmt_putdefaults (GMT, "-");

	Return (GMT_NOERROR);
}