/* Copyright (c) 2007-2020. The SimGrid Team. All rights reserved.          */

/* This program is free software; you can redistribute it and/or modify it
 * under the terms of the license (GNU LGPL) which comes with this package. */

#include "simgrid/msg.h"
#include "simgrid/plugins/live_migration.h"

XBT_LOG_NEW_DEFAULT_CATEGORY(msg_test, "Messages specific for this msg example");

/** @addtogroup MSG_examples
 *
 * - <b>cloud/bound.c</b>: Demonstrates the use of @ref MSG_task_set_bound
 */

static int worker_main(int argc, char* argv[])
{
  xbt_assert(argc == 4);
  double computation_amount = xbt_str_parse_double(argv[1], "Invalid computation amount: %s");
  int use_bound             = xbt_str_parse_int(argv[2], "Second parameter (use_bound) should be 0 or 1 but is: %s");
  double bound              = xbt_str_parse_double(argv[3], "Invalid bound: %s");

  double clock_sta = MSG_get_clock();

  msg_task_t task = MSG_task_create("Task", computation_amount, 0, NULL);
  if (use_bound)
    MSG_task_set_bound(task, bound);
  MSG_task_execute(task);
  MSG_task_destroy(task);

  double clock_end     = MSG_get_clock();
  double duration      = clock_end - clock_sta;
  double flops_per_sec = computation_amount / duration;

  if (use_bound)
    XBT_INFO("bound to %f => duration %f (%f flops/s)", bound, duration, flops_per_sec);
  else
    XBT_INFO("not bound => duration %f (%f flops/s)", duration, flops_per_sec);

  return 0;
}

static void launch_worker(msg_host_t host, const char* pr_name, double computation_amount, int use_bound, double bound)
{
  char** argv = xbt_new(char*, 5);
  argv[0]     = xbt_strdup(pr_name);
  argv[1]     = bprintf("%f", computation_amount);
  argv[2]     = bprintf("%d", use_bound);
  argv[3]     = bprintf("%f", bound);
  argv[4]     = NULL;

  MSG_process_create_with_arguments(pr_name, worker_main, NULL, host, 4, argv);
}

static int worker_busy_loop_main(XBT_ATTRIB_UNUSED int argc, XBT_ATTRIB_UNUSED char* argv[])
{
  msg_task_t* task = MSG_process_get_data(MSG_process_self());
  MSG_task_execute(*task);
  MSG_task_destroy(*task);

  return 0;
}

static void test_dynamic_change(void)
{
  const double DOUBLE_MAX = 1e11;
  msg_host_t pm0 = MSG_host_by_name("Fafard");

  msg_vm_t vm0 = MSG_vm_create_core(pm0, "VM0");
  msg_vm_t vm1 = MSG_vm_create_core(pm0, "VM1");
  MSG_vm_start(vm0);
  MSG_vm_start(vm1);

  msg_task_t task0 = MSG_task_create("Task0", DOUBLE_MAX, 0, NULL);
  msg_task_t task1 = MSG_task_create("Task1", DOUBLE_MAX, 0, NULL);
  MSG_process_create("worker0", worker_busy_loop_main, &task0, (msg_host_t)vm0);
  MSG_process_create("worker1", worker_busy_loop_main, &task1, (msg_host_t)vm1);

  double task0_remain_prev = MSG_task_get_flops_amount(task0);
  double task1_remain_prev = MSG_task_get_flops_amount(task1);

  const double cpu_speed = MSG_host_get_speed(pm0);
  for (int i = 0; i < 10; i++) {
    double new_bound = (cpu_speed / 10) * i;
    XBT_INFO("set bound of VM1 to %f", new_bound);
    MSG_vm_set_bound(vm1, new_bound);
    MSG_process_sleep(100);

    double task0_remain_now = MSG_task_get_flops_amount(task0);
    double task1_remain_now = MSG_task_get_flops_amount(task1);

    double task0_flops_per_sec = task0_remain_prev - task0_remain_now;
    double task1_flops_per_sec = task1_remain_prev - task1_remain_now;

    XBT_INFO("Task0@VM0: %f flops/s", task0_flops_per_sec / 100);
    XBT_INFO("Task1@VM1: %f flops/s", task1_flops_per_sec / 100);

    task0_remain_prev = task0_remain_now;
    task1_remain_prev = task1_remain_now;
  }

  MSG_process_sleep(2000); // let the tasks end

  MSG_vm_destroy(vm0);
  MSG_vm_destroy(vm1);
}

static void test_one_task(msg_host_t hostA)
{
  const double cpu_speed          = MSG_host_get_speed(hostA);
  const double computation_amount = cpu_speed * 10;
  const char* hostA_name          = MSG_host_get_name(hostA);

  XBT_INFO("### Test: with/without MSG_task_set_bound");

  XBT_INFO("### Test: no bound for Task1@%s", hostA_name);
  launch_worker(hostA, "worker0", computation_amount, 0, 0);

  MSG_process_sleep(1000);

  XBT_INFO("### Test: 50%% for Task1@%s", hostA_name);
  launch_worker(hostA, "worker0", computation_amount, 1, cpu_speed / 2);

  MSG_process_sleep(1000);

  XBT_INFO("### Test: 33%% for Task1@%s", hostA_name);
  launch_worker(hostA, "worker0", computation_amount, 1, cpu_speed / 3);

  MSG_process_sleep(1000);

  XBT_INFO("### Test: zero for Task1@%s (i.e., unlimited)", hostA_name);
  launch_worker(hostA, "worker0", computation_amount, 1, 0);

  MSG_process_sleep(1000);

  XBT_INFO("### Test: 200%% for Task1@%s (i.e., meaningless)", hostA_name);
  launch_worker(hostA, "worker0", computation_amount, 1, cpu_speed * 2);

  MSG_process_sleep(1000);
}

static void test_two_tasks(msg_host_t hostA, msg_host_t hostB)
{
  const double cpu_speed = MSG_host_get_speed(hostA);
  xbt_assert(cpu_speed == MSG_host_get_speed(hostB));
  const double computation_amount = cpu_speed * 10;
  const char* hostA_name          = MSG_host_get_name(hostA);
  const char* hostB_name          = MSG_host_get_name(hostB);

  XBT_INFO("### Test: no bound for Task1@%s, no bound for Task2@%s", hostA_name, hostB_name);
  launch_worker(hostA, "worker0", computation_amount, 0, 0);
  launch_worker(hostB, "worker1", computation_amount, 0, 0);

  MSG_process_sleep(1000);

  XBT_INFO("### Test: 0 for Task1@%s, 0 for Task2@%s (i.e., unlimited)", hostA_name, hostB_name);
  launch_worker(hostA, "worker0", computation_amount, 1, 0);
  launch_worker(hostB, "worker1", computation_amount, 1, 0);

  MSG_process_sleep(1000);

  XBT_INFO("### Test: 50%% for Task1@%s, 50%% for Task2@%s", hostA_name, hostB_name);
  launch_worker(hostA, "worker0", computation_amount, 1, cpu_speed / 2);
  launch_worker(hostB, "worker1", computation_amount, 1, cpu_speed / 2);

  MSG_process_sleep(1000);

  XBT_INFO("### Test: 25%% for Task1@%s, 25%% for Task2@%s", hostA_name, hostB_name);
  launch_worker(hostA, "worker0", computation_amount, 1, cpu_speed / 4);
  launch_worker(hostB, "worker1", computation_amount, 1, cpu_speed / 4);

  MSG_process_sleep(1000);

  XBT_INFO("### Test: 75%% for Task1@%s, 100%% for Task2@%s", hostA_name, hostB_name);
  launch_worker(hostA, "worker0", computation_amount, 1, cpu_speed * 0.75);
  launch_worker(hostB, "worker1", computation_amount, 1, cpu_speed);

  MSG_process_sleep(1000);

  XBT_INFO("### Test: no bound for Task1@%s, 25%% for Task2@%s", hostA_name, hostB_name);
  launch_worker(hostA, "worker0", computation_amount, 0, 0);
  launch_worker(hostB, "worker1", computation_amount, 1, cpu_speed / 4);

  MSG_process_sleep(1000);

  XBT_INFO("### Test: 75%% for Task1@%s, 25%% for Task2@%s", hostA_name, hostB_name);
  launch_worker(hostA, "worker0", computation_amount, 1, cpu_speed * 0.75);
  launch_worker(hostB, "worker1", computation_amount, 1, cpu_speed / 4);

  MSG_process_sleep(1000);
}

static int master_main(XBT_ATTRIB_UNUSED int argc, XBT_ATTRIB_UNUSED char* argv[])
{
  msg_host_t pm0 = MSG_host_by_name("Fafard");
  msg_host_t pm1 = MSG_host_by_name("Fafard");

  XBT_INFO("# 1. Put a single task on a PM. ");
  test_one_task(pm0);
  XBT_INFO(" ");

  XBT_INFO("# 2. Put two tasks on a PM.");
  test_two_tasks(pm0, pm0);
  XBT_INFO(" ");

  msg_vm_t vm0 = MSG_vm_create_core(pm0, "VM0");
  MSG_vm_start(vm0);

  XBT_INFO("# 3. Put a single task on a VM. ");
  test_one_task((msg_host_t)vm0);
  XBT_INFO(" ");

  XBT_INFO("# 4. Put two tasks on a VM.");
  test_two_tasks((msg_host_t)vm0, (msg_host_t)vm0);
  XBT_INFO(" ");

  MSG_vm_destroy(vm0);

  vm0 = MSG_vm_create_core(pm0, "VM0");
  MSG_vm_start(vm0);

  XBT_INFO("# 6. Put a task on a PM and a task on a VM.");
  test_two_tasks(pm0, (msg_host_t)vm0);
  XBT_INFO(" ");

  MSG_vm_destroy(vm0);

  vm0              = MSG_vm_create_core(pm0, "VM0");
  double cpu_speed = MSG_host_get_speed(pm0);
  MSG_vm_set_bound(vm0, cpu_speed / 10);
  MSG_vm_start(vm0);

  XBT_INFO("# 7. Put a single task on the VM capped by 10%%.");
  test_one_task((msg_host_t)vm0);
  XBT_INFO(" ");

  XBT_INFO("# 8. Put two tasks on the VM capped by 10%%.");
  test_two_tasks((msg_host_t)vm0, (msg_host_t)vm0);
  XBT_INFO(" ");

  XBT_INFO("# 9. Put a task on a PM and a task on the VM capped by 10%%.");
  test_two_tasks(pm0, (msg_host_t)vm0);
  XBT_INFO(" ");

  MSG_vm_destroy(vm0);

  vm0 = MSG_vm_create_core(pm0, "VM0");

  MSG_vm_set_ramsize(vm0, 1e9); // 1GB
  MSG_vm_start(vm0);

  cpu_speed = MSG_host_get_speed(pm0);
  MSG_vm_start(vm0);

  XBT_INFO("# 10. Test migration");
  const double computation_amount = cpu_speed * 10;

  XBT_INFO("# 10. (a) Put a task on a VM without any bound.");
  launch_worker((msg_host_t)vm0, "worker0", computation_amount, 0, 0);
  MSG_process_sleep(1000);
  XBT_INFO(" ");

  XBT_INFO("# 10. (b) set 10%% bound to the VM, and then put a task on the VM.");
  MSG_vm_set_bound(vm0, cpu_speed / 10);
  launch_worker((msg_host_t)vm0, "worker0", computation_amount, 0, 0);
  MSG_process_sleep(1000);
  XBT_INFO(" ");

  XBT_INFO("# 10. (c) migrate");
  MSG_vm_migrate(vm0, pm1);
  XBT_INFO(" ");

  XBT_INFO("# 10. (d) Put a task again on the VM.");
  launch_worker((msg_host_t)vm0, "worker0", computation_amount, 0, 0);
  MSG_process_sleep(1000);
  XBT_INFO(" ");

  MSG_vm_destroy(vm0);

  XBT_INFO("# 11. Change a bound dynamically.");
  test_dynamic_change();

  return 0;
}

static void launch_master(msg_host_t host)
{
  const char* pr_name = "master_";
  char** argv         = xbt_new(char*, 2);
  argv[0]             = xbt_strdup(pr_name);
  argv[1]             = NULL;

  MSG_process_create_with_arguments(pr_name, master_main, NULL, host, 1, argv);
}

int main(int argc, char* argv[])
{
  /* Get the arguments */
  MSG_init(&argc, argv);
  MSG_vm_live_migration_plugin_init();

  /* load the platform file */
  xbt_assert(argc == 2, "Usage: %s platform_file\n\tExample: %s ../platforms/small_platform.xml\n", argv[0], argv[0]);

  MSG_create_environment(argv[1]);

  msg_host_t pm0 = MSG_host_by_name("Fafard");
  launch_master(pm0);

  int res = MSG_main();
  XBT_INFO("Bye (simulation time %g)", MSG_get_clock());

  return !(res == MSG_OK);
}
