/*
 * Copyright (c) 2008-2009 Travis Geiselbrecht
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <debug.h>
#include <kernel/thread.h>
#include <kernel/timer.h>
#include <platform.h>

#if WITH_LIB_CONSOLE
#include <lib/console.h>

static int cmd_threads(int argc, const cmd_args *argv);
static int cmd_threadstats(int argc, const cmd_args *argv);
static int cmd_threadload(int argc, const cmd_args *argv);

STATIC_COMMAND_START
#if DEBUGLEVEL > 1
STATIC_COMMAND("threads", "list kernel threads", &cmd_threads)
#endif
#if THREAD_STATS
STATIC_COMMAND("threadstats", "thread level statistics", &cmd_threadstats)
STATIC_COMMAND("threadload", "toggle thread load display", &cmd_threadload)
#endif
STATIC_COMMAND_END(kernel);

#if DEBUGLEVEL > 1
static int cmd_threads(int argc, const cmd_args *argv)
{
	printf("thread list:\n");
	dump_all_threads();

	return 0;
}
#endif

#if THREAD_STATS
static int cmd_threadstats(int argc, const cmd_args *argv)
{
	printf("thread stats:\n");
	printf("\ttotal idle time: %lld\n", thread_stats.idle_time);
	printf("\ttotal busy time: %lld\n", current_time_hires() - thread_stats.idle_time);
	printf("\treschedules: %d\n", thread_stats.reschedules);
	printf("\tcontext_switches: %d\n", thread_stats.context_switches);
	printf("\tpreempts: %d\n", thread_stats.preempts);
	printf("\tyields: %d\n", thread_stats.yields);
	printf("\tinterrupts: %d\n", thread_stats.interrupts);
	printf("\ttimer interrupts: %d\n", thread_stats.timer_ints);
	printf("\ttimers: %d\n", thread_stats.timers);

	return 0;
}

static enum handler_return threadload(struct timer *t, time_t now, void *arg)
{
	static struct thread_stats old_stats;
	static bigtime_t last_idle_time;

	bigtime_t idle_time = thread_stats.idle_time;
	if (current_thread == idle_thread) {
		idle_time += current_time_hires() - thread_stats.last_idle_timestamp;
	}
	bigtime_t busy_time = 1000000ULL - (idle_time - last_idle_time);

	uint busypercent = (busy_time * 10000) / (1000000);

//	printf("idle_time %lld, busytime %lld\n", idle_time - last_idle_time, busy_time);
	printf("LOAD: %d.%02d%%, cs %d, ints %d, timer ints %d, timers %d\n", busypercent / 100, busypercent % 100,
			thread_stats.context_switches - old_stats.context_switches,
			thread_stats.interrupts - old_stats.interrupts,
			thread_stats.timer_ints - old_stats.timer_ints,
			thread_stats.timers - old_stats.timers);

	old_stats = thread_stats;
	last_idle_time = idle_time;

	return INT_NO_RESCHEDULE;
}

static int cmd_threadload(int argc, const cmd_args *argv)
{
	static bool showthreadload = false;
	static timer_t tltimer;

	enter_critical_section();

	if (showthreadload == false) {
		// start the display
		timer_initialize(&tltimer);
		timer_set_periodic(&tltimer, 1000, &threadload, NULL);
		showthreadload = true;
	} else {
		timer_cancel(&tltimer);
		showthreadload = false;
	}

	exit_critical_section();

	return 0;
}

#endif

#endif