/* SPDX-License-Identifier: GPL-2.0-or-later

Copyright (C) 2014  Vyacheslav Trushkin
Copyright (C) 2020-2024  Boian Bonev

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.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

*/

#include "iotop.h"

#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

static inline void view_batch(struct xxxid_stats_arr *cs,struct xxxid_stats_arr *ps,struct act_stats *act) {
	double time_s=timediff_in_s(act->ts_o,act->ts_c);
	int diff_len=create_diff(cs,ps,time_s,act->ts_c,NULL,0,NULL);
	double total_a_read,total_a_write;
	char str_a_read[4],str_a_write[4];
	double total_read,total_write;
	char str_read[4],str_write[4];
	int i;

	calc_total(cs,&total_read,&total_write);
	calc_a_total(act,&total_a_read,&total_a_write,time_s);

	humanize_val(&total_read,str_read,1);
	humanize_val(&total_write,str_write,1);
	humanize_val(&total_a_read,str_a_read,0);
	humanize_val(&total_a_write,str_a_write,0);

	printf(HEADER1_FORMAT,total_read,str_read,"",total_write,str_write,"");

	if (config.f.timestamp) {
		time_t t=time(NULL);

		printf(" | %s",ctime(&t));
	} else
		printf("\n");

	printf(HEADER2_FORMAT,total_a_read,str_a_read,"",total_a_write,str_a_write,"");

	printf("\n");

	if (!config.f.quiet)
		printf("%6s %4s %8s %11s %11s %6s %6s %s\n",config.f.processes?"PID":"TID","PRIO","USER","DISK READ","DISK WRITE","SWAPIN","IO","COMMAND");
	arr_sort(cs,iotop_sort_cb);

	for (i=0;cs->sor&&i<diff_len;i++) {
		struct xxxid_stats *s=cs->sor[i];
		char read_str[4],write_str[4];
		double write_val;
		double read_val;
		char *pw_name;

		if (config.f.accumbw) {
			read_val=s->read_val_abw;
			write_val=s->write_val_abw;
		} else if (config.f.accumulated) {
			read_val=s->read_val_acc;
			write_val=s->write_val_acc;
		} else {
			read_val=s->read_val;
			write_val=s->write_val;
		}
		// show only processes, if configured
		if (config.f.processes&&s->pid!=s->tid)
			continue;
		if (config.f.only&&!read_val&&!write_val)
			continue;
		if (s->exited) // do not show exited processes in batch view
			continue;

		humanize_val(&read_val,read_str,1);
		humanize_val(&write_val,write_str,1);

		pw_name=u8strpadt(s->pw_name,10);

		printf("%6i %4s %s %7.2f %-3.3s %7.2f %-3.3s %2.2f %% %2.2f %% %s\n",s->tid,str_ioprio(s->io_prio),pw_name?pw_name:"(null)",read_val,read_str,write_val,write_str,s->swapin_val,s->blkio_val,config.f.fullcmdline?s->cmdline2:s->cmdline1);

		if (pw_name)
			free(pw_name);
	}
}

inline void view_batch_init(void) {
	if (!read_task_delayacct())
		printf("Warning: task_delayacct is 0, enable by: echo 1 > /proc/sys/kernel/task_delayacct\n");
}

inline void view_batch_fini(void) {
}

inline void view_batch_loop(void) {
	struct xxxid_stats_arr *ps=NULL;
	struct xxxid_stats_arr *cs=NULL;
	struct act_stats act={0,0,0,0,0,0,0,};

	for (;;) {
		cs=fetch_data(filter1);
		get_vm_counters(&act.read_bytes,&act.write_bytes);
		act.ts_c=monotime();
		view_batch(cs,ps,&act);

		if (ps)
			arr_free(ps);

		ps=cs;
		act.read_bytes_o=act.read_bytes;
		act.write_bytes_o=act.write_bytes;
		act.ts_o=act.ts_c;
		act.have_o=1;

		if ((params.iter>-1)&&((--params.iter)==0))
			break;
		sleep(params.delay);
	}
	arr_free(cs);
}

