/*
 *  (C) 2010,2011       Thomas Renninger <trenn@suse.de>, Novell Inc.
 *
 *  Licensed under the terms of the GNU GPL License version 2.
 *
 *  Output format inspired by Len Brown's <lenb@kernel.org> turbostat tool.
 *
 */


#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <libgen.h>

#include "idle_monitor/cpupower-monitor.h"
#include "idle_monitor/idle_monitors.h"
#include "helpers/helpers.h"

/* Define pointers to all monitors.  */
#define DEF(x) & x ## _monitor ,
struct cpuidle_monitor *all_monitors[] = {
#include "idle_monitors.def"
0
};

static struct cpuidle_monitor *monitors[MONITORS_MAX];
static unsigned int avail_monitors;

static char *progname;

enum operation_mode_e { list = 1, show, show_all };
static int mode;
static int interval = 1;
static char *show_monitors_param;
static struct cpupower_topology cpu_top;
static unsigned int wake_cpus;

/* ToDo: Document this in the manpage */
static char range_abbr[RANGE_MAX] = { 'T', 'C', 'P', 'M', };

static void print_wrong_arg_exit(void)
{
        printf(_("invalid or unknown argument\n"));
        exit(EXIT_FAILURE);
}

long long timespec_diff_us(struct timespec start, struct timespec end)
{
        struct timespec temp;
        if ((end.tv_nsec - start.tv_nsec) < 0) {
                temp.tv_sec = end.tv_sec - start.tv_sec - 1;
                temp.tv_nsec = 1000000000 + end.tv_nsec - start.tv_nsec;
        } else {
                temp.tv_sec = end.tv_sec - start.tv_sec;
                temp.tv_nsec = end.tv_nsec - start.tv_nsec;
        }
        return (temp.tv_sec * 1000000) + (temp.tv_nsec / 1000);
}

void print_n_spaces(int n)
{
        int x;
        for (x = 0; x < n; x++)
                printf(" ");
}

/* size of s must be at least n + 1 */
int fill_string_with_spaces(char *s, int n)
{
        int len = strlen(s);
        if (len > n)
                return -1;
        for (; len < n; len++)
                s[len] = ' ';
        s[len] = '\0';
        return 0;
}

void print_header(int topology_depth)
{
        int unsigned mon;
        int state, need_len;
        cstate_t s;
        char buf[128] = "";
        int percent_width = 4;

        fill_string_with_spaces(buf, topology_depth * 5 - 1);
        printf("%s|", buf);

        for (mon = 0; mon < avail_monitors; mon++) {
                need_len = monitors[mon]->hw_states_num * (percent_width + 3)
                        - 1;
                if (mon != 0) {
                        printf("|| ");
                        need_len--;
                }
                sprintf(buf, "%s", monitors[mon]->name);
                fill_string_with_spaces(buf, need_len);
                printf("%s", buf);
        }
        printf("\n");

        if (topology_depth > 2)
                printf("PKG |");
        if (topology_depth > 1)
                printf("CORE|");
        if (topology_depth > 0)
                printf("CPU |");

        for (mon = 0; mon < avail_monitors; mon++) {
                if (mon != 0)
                        printf("|| ");
                else
                        printf(" ");
                for (state = 0; state < monitors[mon]->hw_states_num; state++) {
                        if (state != 0)
                                printf(" | ");
                        s = monitors[mon]->hw_states[state];
                        sprintf(buf, "%s", s.name);
                        fill_string_with_spaces(buf, percent_width);
                        printf("%s", buf);
                }
                printf(" ");
        }
        printf("\n");
}


void print_results(int topology_depth, int cpu)
{
        unsigned int mon;
        int state, ret;
        double percent;
        unsigned long long result;
        cstate_t s;

        /* Be careful CPUs may got resorted for pkg value do not just use cpu */
        if (!bitmask_isbitset(cpus_chosen, cpu_top.core_info[cpu].cpu))
                return;
        if (!cpu_top.core_info[cpu].is_online &&
            cpu_top.core_info[cpu].pkg == -1)
                return;

        if (topology_depth > 2)
                printf("%4d|", cpu_top.core_info[cpu].pkg);
        if (topology_depth > 1)
                printf("%4d|", cpu_top.core_info[cpu].core);
        if (topology_depth > 0)
                printf("%4d|", cpu_top.core_info[cpu].cpu);

        for (mon = 0; mon < avail_monitors; mon++) {
                if (mon != 0)
                        printf("||");

                for (state = 0; state < monitors[mon]->hw_states_num; state++) {
                        if (state != 0)
                                printf("|");

                        s = monitors[mon]->hw_states[state];

                        if (s.get_count_percent) {
                                ret = s.get_count_percent(s.id, &percent,
                                                  cpu_top.core_info[cpu].cpu);
                                if (ret)
                                        printf("******");
                                else if (percent >= 100.0)
                                        printf("%6.1f", percent);
                                else
                                        printf("%6.2f", percent);
                        } else if (s.get_count) {
                                ret = s.get_count(s.id, &result,
                                                  cpu_top.core_info[cpu].cpu);
                                if (ret)
                                        printf("******");
                                else
                                        printf("%6llu", result);
                        } else {
                                printf(_("Monitor %s, Counter %s has no count "
                                         "function. Implementation error\n"),
                                       monitors[mon]->name, s.name);
                                exit(EXIT_FAILURE);
                        }
                }
        }
        /*
         * The monitor could still provide useful data, for example
         * AMD HW counters partly sit in PCI config space.
         * It's up to the monitor plug-in to check .is_online, this one
         * is just for additional info.
         */
        if (!cpu_top.core_info[cpu].is_online &&
            cpu_top.core_info[cpu].pkg != -1) {
                printf(_(" *is offline\n"));
                return;
        } else
                printf("\n");
}


/* param: string passed by -m param (The list of monitors to show)
 *
 * Monitors must have been registered already, matching monitors
 * are picked out and available monitors array is overridden
 * with matching ones
 *
 * Monitors get sorted in the same order the user passes them
*/

static void parse_monitor_param(char *param)
{
        unsigned int num;
        int mon, hits = 0;
        char *tmp = param, *token;
        struct cpuidle_monitor *tmp_mons[MONITORS_MAX];


        for (mon = 0; mon < MONITORS_MAX; mon++, tmp = NULL) {
                token = strtok(tmp, ",");
                if (token == NULL)
                        break;
                if (strlen(token) >= MONITOR_NAME_LEN) {
                        printf(_("%s: max monitor name length"
                                 " (%d) exceeded\n"), token, MONITOR_NAME_LEN);
                        continue;
                }

                for (num = 0; num < avail_monitors; num++) {
                        if (!strcmp(monitors[num]->name, token)) {
                                dprint("Found requested monitor: %s\n", token);
                                tmp_mons[hits] = monitors[num];
                                hits++;
                        }
                }
        }
        if (hits == 0) {
                printf(_("No matching monitor found in %s, "
                         "try -l option\n"), param);
                exit(EXIT_FAILURE);
        }
        /* Override detected/registerd monitors array with requested one */
        memcpy(monitors, tmp_mons,
                sizeof(struct cpuidle_monitor *) * MONITORS_MAX);
        avail_monitors = hits;
}

void list_monitors(void)
{
        unsigned int mon;
        int state;
        cstate_t s;

        for (mon = 0; mon < avail_monitors; mon++) {
                printf(_("Monitor \"%s\" (%d states) - Might overflow after %u "
                         "s\n"),
                        monitors[mon]->name, monitors[mon]->hw_states_num,
                        monitors[mon]->overflow_s);

                for (state = 0; state < monitors[mon]->hw_states_num; state++) {
                        s = monitors[mon]->hw_states[state];
                        /*
                         * ToDo show more state capabilities:
                         * percent, time (granlarity)
                         */
                        printf("%s\t[%c] -> %s\n", s.name, range_abbr[s.range],
                               gettext(s.desc));
                }
        }
}

int fork_it(char **argv)
{
        int status;
        unsigned int num;
        unsigned long long timediff;
        pid_t child_pid;
        struct timespec start, end;

        child_pid = fork();
        clock_gettime(CLOCK_REALTIME, &start);

        for (num = 0; num < avail_monitors; num++)
                monitors[num]->start();

        if (!child_pid) {
                /* child */
                execvp(argv[0], argv);
        } else {
                /* parent */
                if (child_pid == -1) {
                        perror("fork");
                        exit(1);
                }

                signal(SIGINT, SIG_IGN);
                signal(SIGQUIT, SIG_IGN);
                if (waitpid(child_pid, &status, 0) == -1) {
                        perror("wait");
                        exit(1);
                }
        }
        clock_gettime(CLOCK_REALTIME, &end);
        for (num = 0; num < avail_monitors; num++)
                monitors[num]->stop();

        timediff = timespec_diff_us(start, end);
        if (WIFEXITED(status))
                printf(_("%s took %.5f seconds and exited with status %d\n"),
                        argv[0], timediff / (1000.0 * 1000),
                        WEXITSTATUS(status));
        return 0;
}

int do_interval_measure(int i)
{
        unsigned int num;
        int cpu;

        if (wake_cpus)
                for (cpu = 0; cpu < cpu_count; cpu++)
                        bind_cpu(cpu);

        for (num = 0; num < avail_monitors; num++) {
                dprint("HW C-state residency monitor: %s - States: %d\n",
                       monitors[num]->name, monitors[num]->hw_states_num);
                monitors[num]->start();
        }

        sleep(i);

        if (wake_cpus)
                for (cpu = 0; cpu < cpu_count; cpu++)
                        bind_cpu(cpu);

        for (num = 0; num < avail_monitors; num++)
                monitors[num]->stop();


        return 0;
}

static void cmdline(int argc, char *argv[])
{
        int opt;
        progname = basename(argv[0]);

        while ((opt = getopt(argc, argv, "+lci:m:")) != -1) {
                switch (opt) {
                case 'l':
                        if (mode)
                                print_wrong_arg_exit();
                        mode = list;
                        break;
                case 'i':
                        /* only allow -i with -m or no option */
                        if (mode && mode != show)
                                print_wrong_arg_exit();
                        interval = atoi(optarg);
                        break;
                case 'm':
                        if (mode)
                                print_wrong_arg_exit();
                        mode = show;
                        show_monitors_param = optarg;
                        break;
                case 'c':
                        wake_cpus = 1;
                        break;
                default:
                        print_wrong_arg_exit();
                }
        }
        if (!mode)
                mode = show_all;
}

int cmd_monitor(int argc, char **argv)
{
        unsigned int num;
        struct cpuidle_monitor *test_mon;
        int cpu;

        cmdline(argc, argv);
        cpu_count = get_cpu_topology(&cpu_top);
        if (cpu_count < 0) {
                printf(_("Cannot read number of available processors\n"));
                return EXIT_FAILURE;
        }

        if (!cpu_top.core_info[0].is_online)
                printf("WARNING: at least one cpu is offline\n");

        /* Default is: monitor all CPUs */
        if (bitmask_isallclear(cpus_chosen))
                bitmask_setall(cpus_chosen);

        dprint("System has up to %d CPU cores\n", cpu_count);

        for (num = 0; all_monitors[num]; num++) {
                dprint("Try to register: %s\n", all_monitors[num]->name);
                test_mon = all_monitors[num]->do_register();
                if (test_mon) {
                        if (test_mon->needs_root && !run_as_root) {
                                fprintf(stderr, _("Available monitor %s needs "
                                          "root access\n"), test_mon->name);
                                continue;
                        }
                        monitors[avail_monitors] = test_mon;
                        dprint("%s registered\n", all_monitors[num]->name);
                        avail_monitors++;
                }
        }

        if (avail_monitors == 0) {
                printf(_("No HW Cstate monitors found\n"));
                return 1;
        }

        if (mode == list) {
                list_monitors();
                exit(EXIT_SUCCESS);
        }

        if (mode == show)
                parse_monitor_param(show_monitors_param);

        dprint("Packages: %d - Cores: %d - CPUs: %d\n",
               cpu_top.pkgs, cpu_top.cores, cpu_count);

        /*
         * if any params left, it must be a command to fork
         */
        if (argc - optind)
                fork_it(argv + optind);
        else
                do_interval_measure(interval);

        /* ToDo: Topology parsing needs fixing first to do
           this more generically */
        if (cpu_top.pkgs > 1)
                print_header(3);
        else
                print_header(1);

        for (cpu = 0; cpu < cpu_count; cpu++) {
                if (cpu_top.pkgs > 1)
                        print_results(3, cpu);
                else
                        print_results(1, cpu);
        }

        for (num = 0; num < avail_monitors; num++)
                monitors[num]->unregister();

        cpu_topology_release(cpu_top);
        return 0;
}