/*---
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---*/

#include "../check_includes.h"

#include <stasis/allocationPolicy.h>
#include <stasis/constants.h>
#include <stasis/util/random.h>

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

#define LOG_NAME   "check_lhtable.log"

/**
   @test
*/

START_TEST(allocationPolicy_smokeTest)
{

  stasis_allocation_policy_t * ap = stasis_allocation_policy_init();
  stasis_allocation_policy_register_new_page(ap, 0, 100);
  stasis_allocation_policy_register_new_page(ap, 1, 100);
  stasis_allocation_policy_register_new_page(ap, 2, 50);
  stasis_allocation_policy_register_new_page(ap, 3, 25);

  pageid_t pageid1 = stasis_allocation_policy_pick_suitable_page(ap, 1, 51);
  assert(pageid1 != INVALID_PAGE);
  stasis_allocation_policy_alloced_from_page(ap, 1, pageid1);
  assert(pageid1 == 0 || pageid1 == 1);
  stasis_allocation_policy_update_freespace(ap, pageid1, 0);

  pageid_t pageid2 = stasis_allocation_policy_pick_suitable_page(ap, 1, 21);
  assert(pageid2 != INVALID_PAGE);
  stasis_allocation_policy_alloced_from_page(ap, 1, pageid2);
  assert(pageid2 == 3);
  stasis_allocation_policy_update_freespace(ap, pageid2, 0);

  pageid_t pageid3 = stasis_allocation_policy_pick_suitable_page(ap, 2, 51);
  stasis_allocation_policy_alloced_from_page(ap, 2, pageid3);
  assert(pageid1 != pageid3);
  stasis_allocation_policy_update_freespace(ap, pageid3, 0);

  pageid_t pageid4 = stasis_allocation_policy_pick_suitable_page(ap, 2, 51);
  assert(pageid4 == INVALID_PAGE);

  pageid_t pageid5 = stasis_allocation_policy_pick_suitable_page(ap, 2, 50);
  stasis_allocation_policy_alloced_from_page(ap, 2, pageid5);
  assert(pageid5== 2);
  stasis_allocation_policy_update_freespace(ap, pageid5, 0);

  stasis_allocation_policy_update_freespace(ap, pageid1, 100);
  stasis_allocation_policy_transaction_completed(ap, 1);
  stasis_allocation_policy_update_freespace(ap, pageid2, 25);

  pageid_t pageid6 = stasis_allocation_policy_pick_suitable_page(ap, 2, 50);
  stasis_allocation_policy_alloced_from_page(ap, 2, pageid6);
  assert(pageid6 == 1 || pageid6 == 0);
  stasis_allocation_policy_update_freespace(ap, pageid6, 0);

  pageid_t pageid7 = stasis_allocation_policy_pick_suitable_page(ap, 2, 50);
  assert(pageid7 == INVALID_PAGE);

  stasis_allocation_policy_update_freespace(ap, 3, 51);

  pageid_t pageid8 =stasis_allocation_policy_pick_suitable_page(ap, 2, 51);
  assert(pageid8 == 3);
  stasis_allocation_policy_alloced_from_page(ap, 2, pageid8);

  stasis_allocation_policy_update_freespace(ap, pageid8, 0);

  stasis_allocation_policy_transaction_completed(ap, 2);

  stasis_allocation_policy_deinit(ap);

} 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,
			     pageid_t * pages1, pageid_t * pages2) {
  switch(stasis_util_random64(5)) {
  case 0 : {   // find page
    int thexid = stasis_util_random64(XACT_COUNT);
    if(xids[thexid] == -1) {
      xids[thexid] = nextxid;
      nextxid++;
      activexidcount++;
      DEBUG("xid begins\n");
    }
    int thefreespace = stasis_util_random64(MAX_DESIRED_FREESPACE);
    pageid_t p =
      stasis_allocation_policy_pick_suitable_page(ap, xids[thexid], thefreespace);
    if(p != INVALID_PAGE) {
      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 = stasis_util_random64(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 = stasis_util_random64(MAX_DESIRED_FREESPACE) - (MAX_DESIRED_FREESPACE/2);
    int thexid;
    if(!activexidcount) { break; }
    while(xids[thexid = stasis_util_random64(XACT_COUNT)] == -1) { }
    int minfreespace;
    if(thespacediff < 0) {
      minfreespace = 0-thespacediff;
    } else {
      minfreespace = 0;
    }
    pageid_t p = stasis_allocation_policy_pick_suitable_page(ap, xids[thexid],
                                                 minfreespace);
    if(p != INVALID_PAGE) {
      int thenewfreespace = stasis_util_random64(MAX_DESIRED_FREESPACE/2)+thespacediff;
      stasis_allocation_policy_update_freespace(ap, p, thenewfreespace);
      //      printf("updated freespace unlocked");
    }
  } break;
  case 3 : {   // dealloc from page
    int thexid;
    if(!activexidcount) { break; }
    while(xids[thexid = stasis_util_random64(XACT_COUNT)] == -1) {}
    pageid_t p = pages1[stasis_util_random64(AVAILABLE_PAGE_COUNT_A)];
    stasis_allocation_policy_dealloced_from_page(ap, xids[thexid], p);
  } break;
  case 4 : {   // alloced from page
    int thexid;
    if(!activexidcount) { break; }
    while(xids[thexid = stasis_util_random64(XACT_COUNT)] == -1) {}
    pageid_t p = pages1[stasis_util_random64(AVAILABLE_PAGE_COUNT_A)];
    if(stasis_allocation_policy_can_xid_alloc_from_page(ap, xids[thexid], p)) {
      stasis_allocation_policy_alloced_from_page(ap, xids[thexid], p);
    }
  } break;
  default: abort();
  }
}

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);

  pageid_t * pages1 = stasis_malloc(AVAILABLE_PAGE_COUNT_A, pageid_t);
  pageid_t * pages2 = stasis_malloc(AVAILABLE_PAGE_COUNT_B, pageid_t);

  int * xids = stasis_malloc(XACT_COUNT, int);

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


  stasis_allocation_policy_t * ap = stasis_allocation_policy_init();

  for(int i = 0; i < AVAILABLE_PAGE_COUNT_A; i++) {
    pages1[i] = i;
    stasis_allocation_policy_register_new_page(ap, i, i * FREE_MUL);
  }

  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);
  }

  for(int i = 0 ; i < AVAILABLE_PAGE_COUNT_B; i++) {
    pages2[i] = AVAILABLE_PAGE_COUNT_A + i;
    stasis_allocation_policy_register_new_page(ap, pages2[i], (AVAILABLE_PAGE_COUNT_A + i) * FREE_MUL);
  }

  for(int k = 0; k < PHASE_TWO_COUNT; k++) {
    takeRandomAction(ap, xids, pages1, pages2);
  }
  for(int i = 0; i < XACT_COUNT; i++) {
    if(xids[i] != INVALID_XID) { stasis_allocation_policy_transaction_completed(ap, xids[i]); }
  }

  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"