/*
 * vim:ts=8:expandtab
 *
 * i3status – Generates a status line for dzen2 or xmobar
 *
 * Copyright © 2008-2009 Michael Stapelberg and contributors
 * Copyright © 2009 Thorsten Toepper <atsutane at freethoughts dot de>
 *
 * See file LICENSE for license information.
 *
 */
#include <string.h>
#include <stdio.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <getopt.h>
#include <signal.h>
#include <confuse.h>
#include <glob.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <sys/time.h>

#include "i3status.h"

/* socket file descriptor for general purposes */
int general_socket;

cfg_t *cfg, *cfg_general;

/*
 * Exit upon SIGPIPE because when we have nowhere to write to, gathering
 * system information is pointless.
 *
 */
void sigpipe(int signum) {
        fprintf(stderr, "Received SIGPIPE, exiting\n");
        exit(1);
}

/*
 * Checks if there is a file at the given path (expanding ~) and returns the
 * full path if so or NULL if there is no file.
 *
 */
static char *file_exists(char *path) {
        static glob_t globbuf;
        struct stat buf;
        char *full_path = NULL;

        if (glob(path, GLOB_NOCHECK | GLOB_TILDE, NULL, &globbuf) < 0)
                return NULL;

        full_path = (globbuf.gl_pathc > 0 ? globbuf.gl_pathv[0] : path);

        if (stat(full_path, &buf) < 0)
                return NULL;

        return full_path;
}

int main(int argc, char *argv[]) {
        unsigned int j;

        cfg_opt_t general_opts[] = {
                CFG_STR("output_format", "dzen2", CFGF_NONE),
                CFG_BOOL("colors", 1, CFGF_NONE),
                CFG_INT("interval", 1, CFGF_NONE),
                CFG_END()
        };

        cfg_opt_t run_watch_opts[] = {
                CFG_STR("pidfile", NULL, CFGF_NONE),
                CFG_STR("format", "%title: %status", CFGF_NONE),
                CFG_END()
        };

        cfg_opt_t wireless_opts[] = {
                CFG_STR("format_up", "W: (%quality at %essid) %ip", CFGF_NONE),
                CFG_STR("format_down", "W: down", CFGF_NONE),
                CFG_END()
        };

        cfg_opt_t ethernet_opts[] = {
                CFG_STR("format_up", "E: %ip (%speed)", CFGF_NONE),
                CFG_STR("format_down", "E: down", CFGF_NONE),
                CFG_END()
        };

        cfg_opt_t ipv6_opts[] = {
                CFG_STR("format", "%ip", CFGF_NONE),
                CFG_END()
        };

        cfg_opt_t battery_opts[] = {
                CFG_STR("format", "%status %percentage %remaining", CFGF_NONE),
                CFG_BOOL("last_full_capacity", false, CFGF_NONE),
                CFG_END()
        };

        cfg_opt_t time_opts[] = {
                CFG_STR("format", "%d.%m.%Y %H:%M:%S", CFGF_NONE),
                CFG_END()
        };

        cfg_opt_t load_opts[] = {
                CFG_STR("format", "%5min %10min %15min", CFGF_NONE),
                CFG_END()
        };

        cfg_opt_t temp_opts[] = {
                CFG_STR("format", "%degrees C", CFGF_NONE),
                CFG_END()
        };

        cfg_opt_t disk_opts[] = {
                CFG_STR("format", "%free", CFGF_NONE),
                CFG_END()
        };

        cfg_opt_t opts[] = {
                CFG_STR_LIST("order", "{ipv6,\"run_watch DHCP\",\"wireless wlan0\",\"ethernet eth0\",\"battery 0\",\"cpu_temperature 0\",load,time}", CFGF_NONE),
                CFG_SEC("general", general_opts, CFGF_NONE),
                CFG_SEC("run_watch", run_watch_opts, CFGF_TITLE | CFGF_MULTI),
                CFG_SEC("wireless", wireless_opts, CFGF_TITLE | CFGF_MULTI),
                CFG_SEC("ethernet", ethernet_opts, CFGF_TITLE | CFGF_MULTI),
                CFG_SEC("battery", battery_opts, CFGF_TITLE | CFGF_MULTI),
                CFG_SEC("cpu_temperature", temp_opts, CFGF_TITLE | CFGF_MULTI),
                CFG_SEC("disk", disk_opts, CFGF_TITLE | CFGF_MULTI),
                CFG_SEC("ipv6", ipv6_opts, CFGF_TITLE),
                CFG_SEC("time", time_opts, CFGF_NONE),
                CFG_SEC("load", load_opts, CFGF_NONE),
                CFG_END()
        };

        char *configfile;
        int o, option_index = 0;
        struct option long_options[] = {
                {"config", required_argument, 0, 'c'},
                {"help", no_argument, 0, 'h'},
                {0, 0, 0, 0}
        };

        struct sigaction action;
        memset(&action, 0, sizeof(struct sigaction));
        action.sa_handler = sigpipe;
        sigaction(SIGPIPE, &action, NULL);

        /* Figure out which configuration file to use before the user may
         * override this setting using -c */

        if ((configfile = file_exists("~/.i3status.conf")) == NULL)
                configfile = file_exists(PREFIX "/etc/i3status.conf");

        while ((o = getopt_long(argc, argv, "c:h", long_options, &option_index)) != -1)
                if ((char)o == 'c')
                        configfile = optarg;
                else if ((char)o == 'h') {
                        printf("i3status © 2008-2009 Michael Stapelberg\n"
                                "Syntax: %s [-c <configfile>]\n", argv[0]);
                        return 0;
                }

        if (configfile == NULL)
                die("No configuration file found\n");

        cfg = cfg_init(opts, CFGF_NONE);
        if (cfg_parse(cfg, configfile) == CFG_PARSE_ERROR)
                return EXIT_FAILURE;

        cfg_general = cfg_getsec(cfg, "general");
        if (cfg_general == NULL)
                die("Could not get section \"general\"\n");

        char *output_str = cfg_getstr(cfg_general, "output_format");
        if (strcasecmp(output_str, "dzen2") == 0)
                output_format = O_DZEN2;
        else if (strcasecmp(output_str, "xmobar") == 0)
                output_format = O_XMOBAR;
        else if (strcasecmp(output_str, "none") == 0)
                output_format = O_NONE;
        else die("Unknown output format: \"%s\"\n", output_str);

        if ((general_socket = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
                die("Could not create socket\n");

        int interval = cfg_getint(cfg_general, "interval");

        while (1) {
                for (j = 0; j < cfg_size(cfg, "order"); j++) {
                        if (j > 0)
                                print_seperator();

                        const char *current = cfg_getnstr(cfg, "order", j);

                        CASE_SEC("ipv6")
                                print_ipv6_info(cfg_getstr(sec, "format"));

                        CASE_SEC_TITLE("wireless")
                                print_wireless_info(title, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));

                        CASE_SEC_TITLE("ethernet")
                                print_eth_info(title, cfg_getstr(sec, "format_up"), cfg_getstr(sec, "format_down"));

                        CASE_SEC_TITLE("battery")
                                print_battery_info(atoi(title), cfg_getstr(sec, "format"), cfg_getbool(sec, "last_full_capacity"));

                        CASE_SEC_TITLE("run_watch")
                                print_run_watch(title, cfg_getstr(sec, "pidfile"), cfg_getstr(sec, "format"));

                        CASE_SEC_TITLE("disk")
                                print_disk_info(title, cfg_getstr(sec, "format"));

                        CASE_SEC("load")
                                print_load(cfg_getstr(sec, "format"));

                        CASE_SEC("time")
                                print_time(cfg_getstr(sec, "format"));

                        CASE_SEC_TITLE("cpu_temperature")
                                print_cpu_temperature_info(atoi(title), cfg_getstr(sec, "format"));
                }
                printf("\n");
                fflush(stdout);

                /* To provide updates on every full second (as good as possible)
                 * we don’t use sleep(interval) but we sleep until the next
                 * second (with microsecond precision) plus (interval-1)
                 * seconds. */
                struct timeval current_time;
                gettimeofday(&current_time, NULL);
                struct timespec ts = {interval - 1, (10e5 - current_time.tv_usec) * 1000};
                nanosleep(&ts, NULL);
        }
}