/* test program with a vty interface to test logging behavior */
/*
 * (C) 2018 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
 * All Rights Reserved
 *
 * Author: Neels Hofmeyr <neels@hofmeyr.de>
 *
 * 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.
 *
 */

#define _GNU_SOURCE
#include <getopt.h>

#include <signal.h>

#include <osmocom/core/logging.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/application.h>

#include <osmocom/vty/command.h>
#include <osmocom/vty/logging.h>
#include <osmocom/vty/misc.h>
#include <osmocom/vty/telnet_interface.h>

#include <stdlib.h>

#include "config.h"

void *root_ctx = NULL;

enum {
	DAA,
	DBB,
	DCCC,
	DDDDD,
	DEEE,
};

DEFUN(log_sweep, log_sweep_cmd,
      "log-sweep [CATEGORY]",
      "Log once for all categories on all levels\n")
{
	int only_category = argc ? log_parse_category(argv[0]) : -1;

	if (argc && only_category < 0) {
		vty_out(vty, "%% Error: unknown category: %s%s", argv[0], VTY_NEWLINE);
		return CMD_WARNING;
	}

#define LOG_LEVEL(CAT, LEVEL) \
	if (only_category < 0 || only_category == CAT) \
		LOGP(CAT, LEVEL, "Log message for " #CAT " on level " #LEVEL "\n")

#define LOG_ALL_LEVELS(CAT) \
	LOG_LEVEL(CAT, LOGL_DEBUG); \
	LOG_LEVEL(CAT, LOGL_INFO); \
	LOG_LEVEL(CAT, LOGL_NOTICE); \
	LOG_LEVEL(CAT, LOGL_ERROR); \
	LOG_LEVEL(CAT, LOGL_FATAL)

	LOG_ALL_LEVELS(DAA);
	LOG_ALL_LEVELS(DBB);
	LOG_ALL_LEVELS(DCCC);
	LOG_ALL_LEVELS(DDDDD);
	LOG_ALL_LEVELS(DEEE);

	vty_out(vty, "%s", VTY_NEWLINE);

	return CMD_SUCCESS;
}

static void vty_commands_init(void)
{
	install_element_ve(&log_sweep_cmd);
}

static const struct log_info_cat default_categories[] = {
	[DAA] = {
		.name = "DAA",
		.description = "Antropomorphic Armadillos (AA)",
		.color = "\033[1;31m",
		.enabled = 1, .loglevel = LOGL_DEBUG,
	},
	[DBB] = {
		.name = "DBB",
		.description = "Bidirectional Breadspread (BB)",
		.color = "\033[1;32m",
		.enabled = 1, .loglevel = LOGL_INFO,
	},
	[DCCC] = {
		.name = "DCCC",
		.description = "Chaos Communication Congress (CCC)",
		.color = "\033[1;33m",
		.enabled = 1, .loglevel = LOGL_NOTICE,
	},
	[DDDDD] = {
		.name = "DDDDD",
		.description = "Dehydrated Dribbling Duck Dunkers (DDDD)",
		.color = "\033[1;34m",
		.enabled = 1, .loglevel = LOGL_ERROR,
	},
	[DEEE] = {
		.name = "DEEE",
		.description = "Exhaustive Entropy Extraction (EEE)",
		.color = "\033[1;35m",
		.enabled = 1, .loglevel = LOGL_FATAL,
	},
};

const struct log_info log_info = {
	.cat = default_categories,
	.num_cat = ARRAY_SIZE(default_categories),
};

static void print_help(void)
{
	printf( "options:\n"
		"  -h	--help		this text\n"
		"  -d	--debug MASK	Enable debugging (e.g. -d DRSL:DOML:DLAPDM)\n"
		"  -D	--daemonize	For the process into a background daemon\n"
		"  -c	--config-file	Specify the filename of the config file\n"
		"  -s	--disable-color	Don't use colors in stderr log output\n"
		"  -T	--timestamp	Prefix every log line with a timestamp\n"
		"  -V	--version	Print version information and exit\n"
		"  -e	--log-level	Set a global log-level\n"
		);
}

static struct {
	const char *config_file;
	int daemonize;
} cmdline_config = {};

static void handle_options(int argc, char **argv)
{
	while (1) {
		int option_idx = 0, c;
		static const struct option long_options[] = {
			{ "help", 0, 0, 'h' },
			{ "debug", 1, 0, 'd' },
			{ "daemonize", 0, 0, 'D' },
			{ "config-file", 1, 0, 'c' },
			{ "disable-color", 0, 0, 's' },
			{ "timestamp", 0, 0, 'T' },
			{ "version", 0, 0, 'V' },
			{ "log-level", 1, 0, 'e' },
			{}
		};

		c = getopt_long(argc, argv, "hc:d:Dc:sTVe:",
				long_options, &option_idx);
		if (c == -1)
			break;

		switch (c) {
		case 'h':
			print_help();
			exit(0);
		case 's':
			log_set_use_color(osmo_stderr_target, 0);
			break;
		case 'd':
			log_parse_category_mask(osmo_stderr_target, optarg);
			break;
		case 'D':
			cmdline_config.daemonize = 1;
			break;
		case 'c':
			cmdline_config.config_file = optarg;
			break;
		case 'T':
			log_set_print_timestamp(osmo_stderr_target, 1);
			break;
		case 'e':
			log_set_log_level(osmo_stderr_target, atoi(optarg));
			break;
		case 'V':
			print_version(1);
			exit(0);
			break;
		default:
			/* catch unknown options *as well as* missing arguments. */
			fprintf(stderr, "Error in command line options. Exiting.\n");
			exit(-1);
		}
	}
}

static int quit = 0;

static void signal_handler(int signal)
{
	fprintf(stdout, "signal %u received\n", signal);

	switch (signal) {
	case SIGINT:
	case SIGTERM:
		quit++;
		break;
	case SIGABRT:
		osmo_generate_backtrace();
		/* in case of abort, we want to obtain a talloc report
		 * and then return to the caller, who will abort the process */
	case SIGUSR1:
		talloc_report(tall_vty_ctx, stderr);
		talloc_report_full(root_ctx, stderr);
		break;
	case SIGUSR2:
		talloc_report_full(tall_vty_ctx, stderr);
		break;
	default:
		break;
	}
}

static struct vty_app_info vty_info = {
	.name		= "logging_vty_test",
	.version	= PACKAGE_VERSION,
};

int main(int argc, char **argv)
{
	int rc;

	root_ctx = talloc_named_const(NULL, 0, "logging_vty_test");

	vty_info.tall_ctx = root_ctx;
	vty_init(&vty_info);

	osmo_init_logging2(root_ctx, &log_info);
	log_enable_multithread();

	vty_commands_init();

	handle_options(argc, argv);

	logging_vty_add_cmds();
	osmo_talloc_vty_add_cmds();

	log_set_print_category(osmo_stderr_target, 1);
	log_set_print_category_hex(osmo_stderr_target, 0);
	log_set_print_level(osmo_stderr_target, 1);
	log_set_print_filename2(osmo_stderr_target, LOG_FILENAME_NONE);
	log_target_file_switch_to_wqueue(osmo_stderr_target);

	if (cmdline_config.config_file) {
		rc = vty_read_config_file(cmdline_config.config_file, NULL);
		if (rc < 0) {
			LOGP(DLGLOBAL, LOGL_FATAL, "Failed to parse the config file: '%s'\n",
			     cmdline_config.config_file);
			return 1;
		}
	}

	rc = telnet_init_default(root_ctx, NULL, 42042);
	if (rc < 0)
		return 2;

	signal(SIGINT, &signal_handler);
	signal(SIGTERM, &signal_handler);
	signal(SIGABRT, &signal_handler);
	signal(SIGUSR1, &signal_handler);
	signal(SIGUSR2, &signal_handler);
	osmo_init_ignore_signals();

	if (cmdline_config.daemonize) {
		rc = osmo_daemonize();
		if (rc < 0) {
			perror("Error during daemonize");
			return 6;
		}
	}

	while (!quit) {
		log_reset_context();
		osmo_select_main(0);
	}

	talloc_report(tall_vty_ctx, stderr);
	talloc_report_full(root_ctx, stderr);

	log_fini();

	return 0;
}