/*---
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
NON-INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND
THE AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE
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GOVERNMENT USE: If you are acquiring this software on behalf of the
U.S. government, the Government shall have only "Restricted Rights" in
the software and related documentation as defined in the Federal
Acquisition Regulations (FARs) in Clause 52.227.19 (c) (2). If you are
acquiring the software on behalf of the Department of Defense, the
software shall be classified as "Commercial Computer Software" and the
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---*/

#include "../check_includes.h"

#include <stasis/allocationPolicy.h>
#include <stasis/common.h>

#include <sys/time.h>
#include <time.h>
#include <assert.h>

#define LOG_NAME   "check_lhtable.log"

long myrandom(long x) {
  double xx = x;
  double r = random();
  double max = ((int64_t)RAND_MAX)+1;
  max /= xx;
  return (long)((r/max));
}

/**
   @test
*/

START_TEST(allocationPolicy_smokeTest)
{

  availablePage ** pages = malloc(5 * sizeof(availablePage*));

  for(int i = 0; i < 4; i++) {
    pages[i] = malloc(sizeof(availablePage));
  }

  availablePage p;

  p.pageid = 0;
  p.freespace = 100;
  p.lockCount = 0;
  (*pages[0]) = p;

  p.pageid = 1;
  p.freespace = 100;
  (*pages[1]) = p;

  p.pageid = 2;
  p.freespace = 50;
  (*pages[2]) = p;

  p.pageid = 3;
  p.freespace = 25;
  (*pages[3]) = p;

  pages[4] = 0;

  stasis_allocation_policy_t * ap = stasis_allocation_policy_init();
  stasis_allocation_policy_register_new_pages(ap, pages);

  availablePage * p1 = stasis_allocation_policy_pick_suitable_page(ap, 1, 51);
  stasis_allocation_policy_alloced_from_page(ap, 1, p1->pageid);

  assert(p1);
  assert(p1->pageid == 0 || p1->pageid == 1);
  stasis_allocation_policy_update_freespace_locked_page(ap, 1, p1, 0);

  availablePage * p2 = stasis_allocation_policy_pick_suitable_page(ap, 1, 21);
  stasis_allocation_policy_alloced_from_page(ap, 1, p2->pageid);

  assert(p2->pageid == 3);
  stasis_allocation_policy_update_freespace_locked_page(ap, 1, p2, 0);

  availablePage * p3 = stasis_allocation_policy_pick_suitable_page(ap, 2, 51);
  stasis_allocation_policy_alloced_from_page(ap, 2, p3->pageid);
  assert(p1->pageid != p3->pageid);
  stasis_allocation_policy_update_freespace_locked_page(ap, 2, p3, 0);

  availablePage * p4 = stasis_allocation_policy_pick_suitable_page(ap, 2, 51);
  assert(!p4);

  availablePage * p5 = stasis_allocation_policy_pick_suitable_page(ap, 2, 50);
  stasis_allocation_policy_alloced_from_page(ap, 2, p5->pageid);
  assert(p5 && p5->pageid == 2);
  stasis_allocation_policy_update_freespace_locked_page(ap, 2, p5, 0);

  stasis_allocation_policy_update_freespace_locked_page(ap, 1, p1, 100);
  stasis_allocation_policy_transaction_completed(ap, 1);
  stasis_allocation_policy_update_freespace_unlocked_page(ap, p2, 25);

  availablePage * p6 = stasis_allocation_policy_pick_suitable_page(ap, 2, 50);
  stasis_allocation_policy_alloced_from_page(ap, 2, p6->pageid);
  assert(p6->pageid == 1 || p6->pageid == 0);
  stasis_allocation_policy_update_freespace_locked_page(ap, 2, p6, 0);

  availablePage * p7 = stasis_allocation_policy_pick_suitable_page(ap, 2, 50);
  assert(!p7);

  stasis_allocation_policy_update_freespace_unlocked_page(ap, pages[3], 51);

  availablePage * p8 =stasis_allocation_policy_pick_suitable_page(ap, 2, 51);
  assert(p8->pageid == 3);
  stasis_allocation_policy_alloced_from_page(ap, 2, p8->pageid);

  stasis_allocation_policy_update_freespace_locked_page(ap, 2, p8, 0);

  stasis_allocation_policy_transaction_completed(ap, 2);

  stasis_allocation_policy_deinit(ap);

  free(pages);


} END_TEST

#define AVAILABLE_PAGE_COUNT_A 1000
#define AVAILABLE_PAGE_COUNT_B 10
#define FREE_MUL 100
#define XACT_COUNT 1000
static const int MAX_DESIRED_FREESPACE =
  (AVAILABLE_PAGE_COUNT_A + AVAILABLE_PAGE_COUNT_B) * FREE_MUL;

#define PHASE_ONE_COUNT 100000
#define PHASE_TWO_COUNT 500000
static int nextxid = 0;
int activexidcount = 0;
static void takeRandomAction(stasis_allocation_policy_t * ap, int * xids,
			     availablePage ** pages1, availablePage ** pages2) {
  switch(myrandom(6)) {
  case 0 : {   // find page
    int thexid = myrandom(XACT_COUNT);
    if(xids[thexid] == -1) {
      xids[thexid] = nextxid;
      nextxid++;
      activexidcount++;
      DEBUG("xid begins\n");
    }
    int thefreespace = myrandom(MAX_DESIRED_FREESPACE);
    availablePage * p =
      stasis_allocation_policy_pick_suitable_page(ap, xids[thexid], thefreespace);
    if(p) {
      DEBUG("alloc succeeds\n");
      // xxx validate returned value...
    } else {
      DEBUG("alloc fails\n");
    }
  } break;
  case 1 : {   // xact completed
    if(!activexidcount) { break; }
    int thexid;
    while(xids[thexid = myrandom(XACT_COUNT)] == -1) { }
    stasis_allocation_policy_transaction_completed(ap, xids[thexid]);
    xids[thexid] = -1;
    activexidcount--;
    DEBUG("complete");
  } break;
  case 2 : {   // update freespace unlocked
    int thespacediff = myrandom(MAX_DESIRED_FREESPACE/2) - (MAX_DESIRED_FREESPACE/2);
    int thexid;
    if(!activexidcount) { break; }
    while(xids[thexid = myrandom(XACT_COUNT)] == -1) { }
    int minfreespace;
    if(thespacediff < 0) {
      minfreespace = 0-thespacediff;
    } else {
      minfreespace = 0;
    }
    availablePage * p = stasis_allocation_policy_pick_suitable_page(ap, xids[thexid],
                                                 minfreespace);
    if(p && p->lockCount == 0) {
      int thenewfreespace = p->freespace+thespacediff;
      stasis_allocation_policy_update_freespace_unlocked_page(ap, p, thenewfreespace);
      //      printf("updated freespace unlocked");
    }
  } break;
  case 3 : {   // update freespace locked
  } break;
  case 4 : {   // lock page
  } break;
  case 5 : {   // alloced from page

    // xxx this case is nonsense.  we pick a random page, alloc from it, and allocation policy correctly sees that we're violating protocol, and cores...
    // xxx write better one..
    /*        int thexid;
    if(!activexidcount) { break; }
    while(xids[thexid = myrandom(XACT_COUNT)] == -1) { }
    pageid_t thepage=myrandom(AVAILABLE_PAGE_COUNT_A + pages2?AVAILABLE_PAGE_COUNT_B:0);
    stasis_allocation_policy_alloced_from_page(ap,thexid,thepage); */

  } break;

  }


}

START_TEST(allocationPolicy_randomTest) {

  struct timeval time;
  gettimeofday(&time,0);
  long seed =  time.tv_usec + time.tv_sec * 1000000;
  printf("\nSeed = %ld\n", seed);
  srandom(seed);

  availablePage ** pages1 =
    malloc((1+AVAILABLE_PAGE_COUNT_A) * sizeof(availablePage *));
  availablePage ** pages2 =
    malloc((1+AVAILABLE_PAGE_COUNT_B) * sizeof(availablePage *));

  int * xids = malloc(sizeof(int) * XACT_COUNT);

  for(int i = 0; i < XACT_COUNT; i++) {
    xids[i] = -1;
  }

  for(int i = 0; i < AVAILABLE_PAGE_COUNT_A; i++) {
    pages1[i] = malloc(sizeof(availablePage));
    pages1[i]->pageid = i;
    pages1[i]->freespace = i * FREE_MUL;
    pages1[i]->lockCount = 0;
  }
  pages1[AVAILABLE_PAGE_COUNT_A] = 0;
  for(int i = 0 ; i < AVAILABLE_PAGE_COUNT_B; i++) {
    pages2[i] = malloc(sizeof(availablePage));
    pages2[i]->pageid = AVAILABLE_PAGE_COUNT_A + i;
    pages2[i]->freespace = (AVAILABLE_PAGE_COUNT_A + i) * FREE_MUL;
    pages2[i]->lockCount = 0;
  }
  pages2[AVAILABLE_PAGE_COUNT_B] = 0;

  stasis_allocation_policy_t * ap = stasis_allocation_policy_init();

  stasis_allocation_policy_register_new_pages(ap, pages1);

  for(int k = 0; k < PHASE_ONE_COUNT; k++) {
    // Don't pass in pages2; ap doesn't know about them yet!
    takeRandomAction(ap, xids, pages1, 0);
  }

  stasis_allocation_policy_register_new_pages(ap, pages2);

  for(int k = 0; k < PHASE_TWO_COUNT; k++) {
    takeRandomAction(ap, xids, pages1, pages2);
  }

  stasis_allocation_policy_deinit(ap);

  free(pages1);
  free(pages2);

} END_TEST

Suite * check_suite(void) {
  Suite *s = suite_create("allocationPolicy");
  /* Begin a new test */
  TCase *tc = tcase_create("allocationPolicy");
  tcase_set_timeout(tc, 0); // disable timeouts

  /* Sub tests are added, one per line, here */
  // XXX this test might be flawed.
  tcase_add_test(tc, allocationPolicy_smokeTest);
  tcase_add_test(tc, allocationPolicy_randomTest);

  /* --------------------------------------------- */

  tcase_add_checked_fixture(tc, setup, teardown);


  suite_add_tcase(s, tc);
  return s;
}

#include "../check_setup.h"