/*--- This software is copyrighted by the Regents of the University of
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THE AUTHORS AND DISTRIBUTORS SPECIFICALLY DISCLAIM ANY WARRANTIES,
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
MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.

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
Government shall have only "Restricted Rights" as defined in Clause
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---*/
#include "../check_includes.h"

#include <stasis/latches.h>
#include <stasis/transactional.h>

#include <assert.h>

#define LOG_NAME   "check_regions.log"


/**
   @test
*/
START_TEST(regions_smokeTest) {
  Tinit();
  int xid = Tbegin();

  pageid_t max_page = 0;
  pageid_t page = TregionAlloc(xid, 100, 0);
  assert(TregionSize(xid, page) == 100);
  pageid_t new_page = page;
  if(new_page + 1 + 100 > max_page) {
    max_page = new_page + 1 + 100;
  }

  new_page = TregionAlloc(xid, 1, 0);
  if(new_page + 2 > max_page) {
    max_page = new_page + 2;
  }
  assert(TregionSize(xid, new_page) == 1);
  TregionDealloc(xid, page);

  pageid_t pages[50];

  for(int i = 0; i < 50; i++) {
    new_page = TregionAlloc(xid, 1, 0);
    assert(TregionSize(xid, new_page) == 1);
    pages[i] = new_page;
    if(new_page + 2 > max_page) {
      max_page = new_page + 2;
    }
  }

  for(int i = 0; i < 50; i+=2) {
    assert(TregionSize(xid, pages[i]) == 1);
    TregionDealloc(xid, pages[i]);
  }

  Tcommit(xid);

  xid = Tbegin();
  for(int i = 0; i < 50; i+=2) {
    new_page = TregionAlloc(xid, 1, 0);
    if(new_page + 2 > max_page) {
      max_page = new_page + 2;
    }
  }
  Tabort(xid);
  xid = Tbegin();
  for(int i = 0; i < 50; i+=2) {
    new_page = TregionAlloc(xid, 1, 0);
    if(new_page + 2 > max_page) {
      max_page = new_page + 2;
    }
  }

  fsckRegions(xid);

  Tcommit(xid);

  printf("\nMaximum space usage = %lld, best possible = %d\n", max_page, 104); // peak storage usage = 100 pages + 1 page + 3 boundary pages.

  Tdeinit();
}
END_TEST

START_TEST(regions_randomizedTest) {
  Tinit();
  time_t seed = time(0);
  printf("Seed = %ld: ", seed);
  srandom(seed);
  int xid = Tbegin();
  pageid_t pagesAlloced = 0;
  pageid_t regionsAlloced = 0;
  double max_blowup = 0;
  pageid_t max_region_count = 0;
  pageid_t max_waste = 0;
  pageid_t max_size = 0;
  pageid_t max_ideal_size = 0;
  for(int i = 0; i < 10000; i++) {
    if(!(i % 100)) {
      Tcommit(xid);
      xid = Tbegin();
    }
    if(!(i % 100)) {
      fsckRegions(xid);
    }

    if(myrandom(2)) {
      unsigned int size = myrandom(100);
      TregionAlloc(xid, size, 0);
      pagesAlloced += size;
      regionsAlloced ++;
    } else {
      if(regionsAlloced) {
	pageid_t victim = myrandom(regionsAlloced);
	pageid_t victimSize;
	pageid_t victimPage;
	TregionFindNthActive(xid, victim, &victimPage, &victimSize);
	TregionDealloc(xid, victimPage);
	pagesAlloced -= victimSize;
	regionsAlloced --;
      } else {
	i--;
      }
    }

    if(regionsAlloced) {
      pageid_t lastRegionStart;
      pageid_t lastRegionSize;

      TregionFindNthActive(xid, regionsAlloced-1, &lastRegionStart, &lastRegionSize);
      pageid_t length = lastRegionStart + lastRegionSize+1;
      pageid_t ideal  = pagesAlloced + regionsAlloced + 1;
      double blowup = (double)length/(double)ideal;
      unsigned long long bytes_wasted = length - ideal;
      // printf("Region count = %d, blowup = %d / %d = %5.2f\n", regionsAlloced, length, ideal, blowup);
      if(max_blowup < blowup) {
	max_blowup = blowup;
      }
      if(max_waste < bytes_wasted) {
	max_waste = bytes_wasted;
      }
      if(max_size < length) {
	max_size = length;
      }
      if(max_ideal_size < ideal) {
	max_ideal_size = ideal;
      }
      if(max_region_count < regionsAlloced) {
	max_region_count = regionsAlloced;
      }
    }
  }
  fsckRegions(xid);
  Tcommit(xid);

  Tdeinit();
  printf("Max # of regions = %lld, page file size = %5.2fM, ideal page file size = %5.2fM, (blowup = %5.2f)\n",
	 //peak bytes wasted = %5.2fM, blowup = %3.2f\n",
	 max_region_count,
	 ((double)max_size * PAGE_SIZE)/(1024.0*1024.0),
	 ((double)max_ideal_size * PAGE_SIZE)/(1024.0*1024.0),
	 (double)max_size/(double)max_ideal_size);
  //	 ((double)max_waste * PAGE_SIZE)/(1024.0*1024.0),
  //	 max_blowup);
  if((double)max_size/(double)max_ideal_size > 5) {
    // max_blowup isn't what we want here; it measures the peak
    // percentage of the file that is unused.  Instead, we want to
    // measure the actual and ideal page file sizes for this run.
    printf("ERROR: Excessive blowup (max allowable is 5)\n");
    abort();
  }

} END_TEST

START_TEST(regions_lockSmokeTest) {
  Tinit();
  int xid = Tbegin();
  pageid_t pageid = TregionAlloc(xid, 100,0);
  fsckRegions(xid);
  Tcommit(xid);


  xid = Tbegin();
  int xid2 = Tbegin();

  TregionDealloc(xid, pageid);

  for(int i = 0; i < 50; i++) {
    TregionAlloc(xid2, 1, 0);
  }

  fsckRegions(xid);
  Tabort(xid);
  fsckRegions(xid2);
  Tcommit(xid2);
  Tdeinit();
} END_TEST

START_TEST(regions_lockRandomizedTest) {
  Tinit();

  const int NUM_XACTS = 100;
  const int NUM_OPS   = 10000;
  const int FUDGE = 10;
  int xids[NUM_XACTS];

  pageid_t * xidRegions[NUM_XACTS + FUDGE];
  int xidRegionCounts[NUM_XACTS + FUDGE];

  int longXid = Tbegin();

  time_t seed = time(0);
  printf("\nSeed = %ld\n", seed);
  srandom(seed);

  for(int i = 0; i < NUM_XACTS; i++) {
    xids[i] = Tbegin();
    assert(xids[i] < NUM_XACTS + FUDGE);
    xidRegions[xids[i]] = malloc(sizeof(pageid_t) * NUM_OPS);
    xidRegionCounts[xids[i]] = 0;
  }
  int activeXacts = NUM_XACTS;

  for(int i = 0; i < NUM_OPS; i++) {
    pageid_t j;
    if(!(i % (NUM_OPS/NUM_XACTS))) {
      // abort or commit one transaction randomly.
      activeXacts --;
      j = myrandom(activeXacts);

      if(myrandom(2)) {
	Tcommit(xids[j]);
      } else {
	Tabort(xids[j]);
      }

      if(activeXacts == 0) {
	break;
      }
      for(; j < activeXacts; j++) {
	xids[j] = xids[j+1];
      }
      fsckRegions(longXid);
    }

    j = myrandom(activeXacts);

    if(myrandom(2)) {
      // alloc
      xidRegions[xids[j]][xidRegionCounts[xids[j]]] = TregionAlloc(xids[j], myrandom(100), 0);
	xidRegionCounts[xids[j]]++;
    } else {
      // free
      if(xidRegionCounts[xids[j]]) {
	pageid_t k = myrandom(xidRegionCounts[xids[j]]);

	TregionDealloc(xids[j], xidRegions[xids[j]][k]);

	xidRegionCounts[xids[j]]--;

	for(; k < xidRegionCounts[xids[j]]; k++) {
	  xidRegions[xids[j]][k] = xidRegions[xids[j]][k+1];
	}
      }
    }
  }

  for(int i = 0; i < activeXacts; i++) {
    Tabort(i);
    fsckRegions(longXid);
  }

  Tcommit(longXid);

  Tdeinit();
} END_TEST

START_TEST(regions_recoveryTest) {

  Tinit();

  pageid_t pages[50];
  int xid1 = Tbegin();
  int xid2 = Tbegin();
  for(int i = 0; i < 50; i+=2) {
    pages[i] = TregionAlloc(xid1, myrandom(4)+1, 0);
    pages[i+1] = TregionAlloc(xid2, myrandom(2)+1, 0);
  }

  fsckRegions(xid1);

  Tcommit(xid1);

  Tdeinit();

  if(TdurabilityLevel() == VOLATILE) { return; }

  Tinit();

  int xid = Tbegin();
  fsckRegions(xid);

  for(int i = 0; i < 50; i+=2) {
    TregionDealloc(xid, pages[i]);
  }

  fsckRegions(xid);
  Tabort(xid);
  fsckRegions(Tbegin());
  Tdeinit();

  Tinit();
  fsckRegions(Tbegin());
  Tdeinit();

} END_TEST

/**
  Add suite declarations here
*/
Suite * check_suite(void) {
  Suite *s = suite_create("regions");
  /* Begin a new test */
  TCase *tc = tcase_create("regions_test");
  tcase_set_timeout(tc, 0); // disable timeouts

  stasis_log_softcommit = 1; // disable forcing log at commit

  /* Sub tests are added, one per line, here */
  tcase_add_test(tc, regions_smokeTest);
  tcase_add_test(tc, regions_randomizedTest);
  tcase_add_test(tc, regions_lockSmokeTest);
  tcase_add_test(tc, regions_lockRandomizedTest);
  tcase_add_test(tc, regions_recoveryTest);
  /* --------------------------------------------- */
  tcase_add_checked_fixture(tc, setup, teardown);
  suite_add_tcase(s, tc);


  return s;
}

#include "../check_setup.h"