/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1998 Kenneth D. Merry.
 *               2015 Yoshihiro Ota
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/*-
 * Copyright (c) 1980, 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */



#include <sys/types.h>
#include <sys/devicestat.h>
#include <sys/resource.h>

#include <ctype.h>
#include <err.h>
#include <stdlib.h>
#include <string.h>

#include "systat.h"
#include "extern.h"
#include "devs.h"

typedef enum {
        DS_MATCHTYPE_NONE,
        DS_MATCHTYPE_SPEC,
        DS_MATCHTYPE_PATTERN
} last_match_type;

struct statinfo cur_dev, last_dev, run_dev;

static last_match_type last_type;
struct device_selection *dev_select;
long generation;
int num_devices, num_selected;
int num_selections;
long select_generation;
static struct devstat_match *matches = NULL;
static int num_matches = 0;
static char **specified_devices;
static int num_devices_specified = 0;

static int dsmatchselect(const char *args, devstat_select_mode select_mode,
                         int maxshowdevs, struct statinfo *s1);
static int dsselect(const char *args, devstat_select_mode select_mode,
                    int maxshowdevs, struct statinfo *s1);

int
dsinit(int maxshowdevs)
{
        /*
         * Make sure that the userland devstat version matches the kernel
         * devstat version.  If not, exit and print a message informing
         * the user of his mistake.
         */
        if (devstat_checkversion(NULL) < 0)
                errx(1, "%s", devstat_errbuf);

        if( cur_dev.dinfo ) // init was alreay ran
                return(1);

        if ((num_devices = devstat_getnumdevs(NULL)) < 0) {
                warnx("%s", devstat_errbuf);
                return(0);
        }

        cur_dev.dinfo = calloc(1, sizeof(struct devinfo));
        last_dev.dinfo = calloc(1, sizeof(struct devinfo));
        run_dev.dinfo = calloc(1, sizeof(struct devinfo));

        generation = 0;
        num_devices = 0;
        num_selected = 0;
        num_selections = 0;
        select_generation = 0;
        last_type = DS_MATCHTYPE_NONE;

        if (devstat_getdevs(NULL, &cur_dev) == -1)
                errx(1, "%s", devstat_errbuf);

        num_devices = cur_dev.dinfo->numdevs;
        generation = cur_dev.dinfo->generation;

        dev_select = NULL;

        /*
         * At this point, selectdevs will almost surely indicate that the
         * device list has changed, so we don't look for return values of 0
         * or 1.  If we get back -1, though, there is an error.
         */
        if (devstat_selectdevs(&dev_select, &num_selected, &num_selections,
            &select_generation, generation, cur_dev.dinfo->devices, num_devices,
            NULL, 0, NULL, 0, DS_SELECT_ADD, maxshowdevs, 0) == -1)
                errx(1, "%d %s", __LINE__, devstat_errbuf);

        return(1);
}


void
dsgetinfo(struct statinfo* dev)
{
        switch (devstat_getdevs(NULL, dev)) {
        case -1:
                errx(1, "%s", devstat_errbuf);
                break;
        case 1:
                num_devices = dev->dinfo->numdevs;
                generation = dev->dinfo->generation;
                cmdkre("refresh", NULL);
                break;
        default:
                break;
        }
}

int
dscmd(const char *cmd, const char *args, int maxshowdevs, struct statinfo *s1)
{
        int retval;

        if (prefix(cmd, "display") || prefix(cmd, "add"))
                return(dsselect(args, DS_SELECT_ADDONLY, maxshowdevs, s1));
        if (prefix(cmd, "ignore") || prefix(cmd, "delete"))
                return(dsselect(args, DS_SELECT_REMOVE, maxshowdevs, s1));
        if (prefix(cmd, "show") || prefix(cmd, "only"))
                return(dsselect(args, DS_SELECT_ONLY, maxshowdevs, s1));
        if (prefix(cmd, "type") || prefix(cmd, "match"))
                return(dsmatchselect(args, DS_SELECT_ONLY, maxshowdevs, s1));
        if (prefix(cmd, "refresh")) {
                retval = devstat_selectdevs(&dev_select, &num_selected,
                    &num_selections, &select_generation, generation,
                    s1->dinfo->devices, num_devices,
                    (last_type ==DS_MATCHTYPE_PATTERN) ?  matches : NULL,
                    (last_type ==DS_MATCHTYPE_PATTERN) ?  num_matches : 0,
                    (last_type == DS_MATCHTYPE_SPEC) ?specified_devices : NULL,
                    (last_type == DS_MATCHTYPE_SPEC) ?num_devices_specified : 0,
                    (last_type == DS_MATCHTYPE_NONE) ?  DS_SELECT_ADD :
                    DS_SELECT_ADDONLY, maxshowdevs, 0);
                if (retval == -1) {
                        warnx("%s", devstat_errbuf);
                        return(0);
                } else if (retval == 1)
                        return(2);
        }
        if (prefix(cmd, "drives")) {
                int i;
                move(CMDLINE, 0);
                clrtoeol();
                for (i = 0; i < num_devices; i++) {
                        printw("%s%d ", s1->dinfo->devices[i].device_name,
                               s1->dinfo->devices[i].unit_number);
                }
                return(1);
        }
        return(0);
}

static int
dsmatchselect(const char *args, devstat_select_mode select_mode, int maxshowdevs,
              struct statinfo *s1)
{
        char **tempstr, *tmpstr, *tmpstr1;
        char *tstr[100];
        int num_args = 0;
        int i;
        int retval = 0;

        if (!args) {
                warnx("dsmatchselect: no arguments");
                return(1);
        }

        /*
         * Break the (pipe delimited) input string out into separate
         * strings.
         */
        tmpstr = tmpstr1 = strdup(args);
        for (tempstr = tstr, num_args  = 0;
             (*tempstr = strsep(&tmpstr1, "|")) != NULL && (num_args < 100);
             num_args++)
                if (**tempstr != '\0')
                        if (++tempstr >= &tstr[100])
                                break;
        free(tmpstr);

        if (num_args > 99) {
                warnx("dsmatchselect: too many match arguments");
                return(0);
        }

        /*
         * If we've gone through the matching code before, clean out
         * previously used memory.
         */
        if (num_matches > 0) {
                free(matches);
                matches = NULL;
                num_matches = 0;
        }

        for (i = 0; i < num_args; i++) {
                if (devstat_buildmatch(tstr[i], &matches, &num_matches) != 0) {
                        warnx("%s", devstat_errbuf);
                        return(0);
                }
        }
        if (num_args > 0) {

                last_type = DS_MATCHTYPE_PATTERN;

                retval = devstat_selectdevs(&dev_select, &num_selected,
                    &num_selections, &select_generation, generation,
                    s1->dinfo->devices, num_devices, matches, num_matches,
                    NULL, 0, select_mode, maxshowdevs, 0);
                if (retval == -1)
                        err(1, "device selection error");
                else if (retval == 1)
                        return(2);
        }
        return(1);
}

static int
dsselect(const char *args, devstat_select_mode select_mode, int maxshowdevs,
         struct statinfo *s1)
{
        char *cp, *tmpstr, *tmpstr1, *buffer;
        int i;
        int retval = 0;

        if (!args) {
                warnx("dsselect: no argument");
                return(1);
        }

        /*
         * If we've gone through this code before, free previously
         * allocated resources.
         */
        if (num_devices_specified > 0) {
                for (i = 0; i < num_devices_specified; i++)
                        free(specified_devices[i]);
                free(specified_devices);
                specified_devices = NULL;
                num_devices_specified = 0;
        }

        /* do an initial malloc */
        specified_devices = (char **)malloc(sizeof(char *));

        tmpstr = tmpstr1 = strdup(args);
        cp = strchr(tmpstr1, '\n');
        if (cp)
                *cp = '\0';
        for (;;) {
                for (cp = tmpstr1; *cp && isspace(*cp); cp++)
                        ;
                tmpstr1 = cp;
                for (; *cp && !isspace(*cp); cp++)
                        ;
                if (*cp)
                        *cp++ = '\0';
                if (cp - tmpstr1 == 0)
                        break;
                for (i = 0; i < num_devices; i++) {
                        asprintf(&buffer, "%s%d", dev_select[i].device_name,
                                dev_select[i].unit_number);
                        if (strcmp(buffer, tmpstr1) == 0) {

                                num_devices_specified++;

                                specified_devices =(char **)realloc(
                                                specified_devices,
                                                sizeof(char *) *
                                                num_devices_specified);
                                specified_devices[num_devices_specified -1]=
                                        strdup(tmpstr1);
                                free(buffer);

                                break;
                        }
                        else
                                free(buffer);
                }
                if (i >= num_devices)
                        error("%s: unknown drive", args);
                tmpstr1 = cp;
        }
        free(tmpstr);

        if (num_devices_specified > 0) {
                last_type = DS_MATCHTYPE_SPEC;

                retval = devstat_selectdevs(&dev_select, &num_selected,
                    &num_selections, &select_generation, generation,
                    s1->dinfo->devices, num_devices, NULL, 0,
                    specified_devices, num_devices_specified,
                    select_mode, maxshowdevs, 0);
                if (retval == -1)
                        err(1, "%s", devstat_errbuf);
                else if (retval == 1)
                        return(2);
        }
        return(1);
}


void
dslabel(int maxdrives, int diskcol, int diskrow)
{
        int i, j;

        mvprintw(diskrow, diskcol, "Disks");
        mvprintw(diskrow + 1, diskcol, "KB/t");
        mvprintw(diskrow + 2, diskcol, "tps");
        mvprintw(diskrow + 3, diskcol, "MB/s");
        mvprintw(diskrow + 4, diskcol, "%%busy");
        /*
         * For now, we don't support a fourth disk statistic.  So there's
         * no point in providing a label for it.  If someone can think of a
         * fourth useful disk statistic, there is room to add it.
         */
        /* mvprintw(diskrow + 4, diskcol, " msps"); */
        j = 0;
        for (i = 0; i < num_devices && j < maxdrives; i++)
                if (dev_select[i].selected) {
                        char tmpstr[80];
                        sprintf(tmpstr, "%s%d", dev_select[i].device_name,
                                dev_select[i].unit_number);
                        mvprintw(diskrow, diskcol + 5 + 6 * j,
                                " %5.5s", tmpstr);
                        j++;
                }
}

static void
dsshow2(int diskcol, int diskrow, int dn, int lc, struct statinfo *now, struct statinfo *then)
{
        long double transfers_per_second;
        long double kb_per_transfer, mb_per_second;
        long double elapsed_time, device_busy;
        int di;

        di = dev_select[dn].position;

        if (then != NULL) {
                /* Calculate relative to previous sample */
                elapsed_time = now->snap_time - then->snap_time;
        } else {
                /* Calculate relative to device creation */
                elapsed_time = now->snap_time - devstat_compute_etime(
                    &now->dinfo->devices[di].creation_time, NULL);
        }

        if (devstat_compute_statistics(&now->dinfo->devices[di], then ?
            &then->dinfo->devices[di] : NULL, elapsed_time,
            DSM_KB_PER_TRANSFER, &kb_per_transfer,
            DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
            DSM_MB_PER_SECOND, &mb_per_second,
            DSM_BUSY_PCT, &device_busy,
            DSM_NONE) != 0)
                errx(1, "%s", devstat_errbuf);

        lc = diskcol + lc * 6;
        putlongdouble(kb_per_transfer, diskrow + 1, lc, 5, 2, 0);
        putlongdouble(transfers_per_second, diskrow + 2, lc, 5, 0, 0);
        putlongdouble(mb_per_second, diskrow + 3, lc, 5, 2, 0);
        putlongdouble(device_busy, diskrow + 4, lc, 5, 0, 0);
}

void
dsshow(int maxdrives, int diskcol, int diskrow, struct statinfo *now, struct statinfo *then)
{
        int i, lc;

        for (i = 0, lc = 0; i < num_devices && lc < maxdrives; i++)
                if (dev_select[i].selected)
                        dsshow2(diskcol, diskrow, i, ++lc, now, then);
}