/**
 *    Copyright (C) 2013 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects
 *    for all of the code used other than as permitted herein. If you modify
 *    file(s) with this exception, you may extend this exception to your
 *    version of the file(s), but you are not obligated to do so. If you do not
 *    wish to do so, delete this exception statement from your version. If you
 *    delete this exception statement from all source files in the program,
 *    then also delete it in the license file.
 */

#include "mongo/db/query/interval.h"

#include "mongo/db/jsobj.h"
#include "mongo/unittest/unittest.h"

namespace {

    using mongo::BSONObj;
    using mongo::Interval;

    //
    // Comparison
    //

    TEST(Comparison, Equality) {
        Interval a(BSON("" << 0 << "" << 10), true, true);
        ASSERT_EQUALS(a.compare(a), Interval::INTERVAL_EQUALS);

        Interval b(BSON("" << 0 << "" << 10), true, false);
        ASSERT_NOT_EQUALS(a.compare(b), Interval::INTERVAL_EQUALS);

        Interval c(BSON("" << 0 << "" << 10), false, true);
        ASSERT_NOT_EQUALS(a.compare(c), Interval::INTERVAL_EQUALS);

        Interval d(BSON("" << 0 << "" << 11), true, true);
        ASSERT_NOT_EQUALS(a.compare(d), Interval::INTERVAL_EQUALS);

        Interval e(BSON("" << 1 << "" << 10), true, true);
        ASSERT_NOT_EQUALS(a.compare(e), Interval::INTERVAL_EQUALS);
    }

    TEST(Comparison, Contains) {
        Interval a(BSON("" << 0 << "" << 10), true, true);
        Interval b(BSON("" << 1 << "" << 9), true, true);
        ASSERT_EQUALS(a.compare(b), Interval::INTERVAL_CONTAINS);

        Interval c(BSON("" << 0 << "" << 10), true, false);
        ASSERT_EQUALS(a.compare(c), Interval::INTERVAL_CONTAINS);

        Interval d(BSON("" << 0 << "" << 10), false, true);
        ASSERT_EQUALS(a.compare(d), Interval::INTERVAL_CONTAINS);

        Interval e(BSON("" << 0 << "" << 11), false, true);
        ASSERT_NOT_EQUALS(a.compare(e), Interval::INTERVAL_CONTAINS);
    }

    TEST(Comparison, Within) {
        Interval a(BSON("" << 0 << "" << 10), true, true);
        ASSERT_NOT_EQUALS(a.compare(a), Interval::INTERVAL_WITHIN);

        Interval b(BSON("" << 1 << "" << 9), true, true);
        ASSERT_EQUALS(b.compare(a), Interval::INTERVAL_WITHIN);

        Interval c(BSON("" << 0 << "" << 10), true, false);
        ASSERT_EQUALS(c.compare(a), Interval::INTERVAL_WITHIN);

        Interval d(BSON("" << 0 << "" << 10), false, true);
        ASSERT_EQUALS(d.compare(a), Interval::INTERVAL_WITHIN);

        Interval e(BSON("" << 0 << "" << 11), false, true);
        ASSERT_NOT_EQUALS(e.compare(a), Interval::INTERVAL_CONTAINS);
    }

    TEST(Comparison, OverlapsBefore) {
        Interval a(BSON("" << 1 << "" << 9), true, false);
        ASSERT_NOT_EQUALS(a.compare(a), Interval::INTERVAL_OVERLAPS_BEFORE);

        Interval b(BSON("" << 1 << "" << 9), false, true);
        ASSERT_EQUALS(a.compare(b), Interval::INTERVAL_OVERLAPS_BEFORE);

        Interval c(BSON("" << 1 << "" << 9), false, false);
        ASSERT_NOT_EQUALS(a.compare(c), Interval::INTERVAL_OVERLAPS_BEFORE);

        Interval d(BSON("" << 2 << "" << 10), true, true);
        ASSERT_EQUALS(a.compare(d), Interval::INTERVAL_OVERLAPS_BEFORE);

        Interval e(BSON("" << 0 << "" << 9), true, false);
        ASSERT_NOT_EQUALS(a.compare(e), Interval::INTERVAL_OVERLAPS_BEFORE);

        Interval f(BSON("" << 0 << "" << 8), true, false);
        ASSERT_NOT_EQUALS(a.compare(f), Interval::INTERVAL_OVERLAPS_BEFORE);
    }

    TEST(Comparison, OverlapsAfter) {
        Interval a(BSON("" << 1 << "" << 9), false, true);
        ASSERT_NOT_EQUALS(a.compare(a), Interval::INTERVAL_OVERLAPS_AFTER);

        Interval b(BSON("" << 1 << "" << 9), true, false);
        ASSERT_EQUALS(a.compare(b), Interval::INTERVAL_OVERLAPS_AFTER);

        Interval c(BSON("" << 1 << "" << 9), true, true);
        ASSERT_NOT_EQUALS(a.compare(c), Interval::INTERVAL_OVERLAPS_AFTER);

        Interval d(BSON("" << 2 << "" << 10), true, true);
        ASSERT_NOT_EQUALS(a.compare(d), Interval::INTERVAL_OVERLAPS_AFTER);

        Interval e(BSON("" << 0 << "" << 9), true, false);
        ASSERT_EQUALS(a.compare(e), Interval::INTERVAL_OVERLAPS_AFTER);
    }

    TEST(Comparison, Precedes) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        ASSERT_NOT_EQUALS(a.compare(a), Interval::INTERVAL_PRECEDES);

        Interval b(BSON("" << 0 << "" << 10), true, true);
        ASSERT_NOT_EQUALS(b.compare(a), Interval::INTERVAL_PRECEDES);

        Interval c(BSON("" << 0 << "" << 10), true, false);
        ASSERT_EQUALS(c.compare(a), Interval::INTERVAL_PRECEDES_COULD_UNION);

        Interval d(BSON("" << 0 << "" << 9), true, true);
        ASSERT_EQUALS(d.compare(a), Interval::INTERVAL_PRECEDES);

        Interval e(BSON("" << 5 << "" << 15), true, true);
        ASSERT_NOT_EQUALS(e.compare(a), Interval::INTERVAL_PRECEDES);

        Interval f(BSON("" << 5 << "" << 20), true, false);
        ASSERT_NOT_EQUALS(f.compare(a), Interval::INTERVAL_PRECEDES);
    }

    TEST(Comparison, PrecedesCouldUnion) {
        Interval a(BSON("" << 10 << "" << 20), false, true);
        ASSERT_NOT_EQUALS(a.compare(a), Interval::INTERVAL_PRECEDES);

        Interval b(BSON("" << 0 << "" << 10), true, false);
        ASSERT_EQUALS(b.compare(a), Interval::INTERVAL_PRECEDES);

        Interval c(BSON("" << 0 << "" << 10), true, true);
        ASSERT_EQUALS(c.compare(a), Interval::INTERVAL_PRECEDES_COULD_UNION);
    }

    TEST(Comparison, Succeds) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        ASSERT_NOT_EQUALS(a.compare(a), Interval::INTERVAL_SUCCEEDS);

        Interval b(BSON("" << 20 << "" << 30), true, true);
        ASSERT_NOT_EQUALS(b.compare(a), Interval::INTERVAL_SUCCEEDS);

        Interval c(BSON("" << 20 << "" << 30), false, true);
        ASSERT_EQUALS(c.compare(a), Interval::INTERVAL_SUCCEEDS);

        Interval d(BSON("" << 21 << "" << 30), true, true);
        ASSERT_EQUALS(d.compare(a), Interval::INTERVAL_SUCCEEDS);

        Interval e(BSON("" << 15 << "" << 30), true, true);
        ASSERT_NOT_EQUALS(e.compare(a), Interval::INTERVAL_SUCCEEDS);
    }

    //
    // intersection
    //

    TEST(Intersection, Equals) {
        BSONObj itv = BSON("" << 10 << "" << 20);
        Interval a(itv, true, true);
        a.intersect(a);
        ASSERT_EQUALS(a.compare(Interval(itv, true, true)), Interval::INTERVAL_EQUALS);
    }

    TEST(Intersection, Contains) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        BSONObj itv = BSON("" << 11 << "" << 19);
        Interval b(itv, true, true);
        a.intersect(b);
        ASSERT_EQUALS(a.compare(b), Interval::INTERVAL_EQUALS);
    }

    TEST(Intersection, Within) {
        BSONObj itv = BSON("" << 10 << "" << 20);
        Interval a(itv, true, true);
        Interval b(BSON("" << 9 << "" << 21), true, true);
        a.intersect(b);
        ASSERT_EQUALS(a.compare(Interval(itv, true, true)), Interval::INTERVAL_EQUALS);
    }

    TEST(Intersection, OverlapsBefore) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        Interval b(BSON("" << 15 << "" << 25), true, true);
        a.intersect(b);

        BSONObj itv = BSON("" << 15 << "" << 20);
        ASSERT_EQUALS(a.compare(Interval(itv, true, true)), Interval::INTERVAL_EQUALS);
    }

    TEST(Intersection, OverlapsAfter) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        Interval b(BSON("" << 5 << "" << 15), true, true);
        a.intersect(b);

        BSONObj itv = BSON("" << 10 << "" << 15);
        ASSERT_EQUALS(a.compare(Interval(itv, true, true)), Interval::INTERVAL_EQUALS);
    }

    TEST(Intersection, Procedes) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        Interval b(BSON("" << 0 << "" << 5), true, true);
        a.intersect(b);

        ASSERT_TRUE(a.isEmpty());
    }

    TEST(Intersection, Succeds) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        Interval b(BSON("" << 25 << "" << 30), true, true);
        a.intersect(b);

        ASSERT_TRUE(a.isEmpty());
    }

    //
    // combine (union)
    //

    TEST(Union, Equals) {
        BSONObj itv = BSON("" << 10 << "" << 20);
        Interval a(itv, true, true);
        a.combine(a);
        ASSERT_EQUALS(a.compare(Interval(itv, true, true)), Interval::INTERVAL_EQUALS);
    }

    TEST(Union, Contains) {
        BSONObj itv = BSON("" << 10 << "" << 20);
        Interval a(itv, true, true);
        Interval b(BSON("" << 11 << "" << 19), true, true);
        a.combine(b);
        ASSERT_EQUALS(a.compare(Interval(itv, true, true)), Interval::INTERVAL_EQUALS);
    }

    TEST(Union, Within) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        Interval b(BSON("" << 9 << "" << 21), true, true);
        a.combine(b);
        ASSERT_EQUALS(a.compare(b), Interval::INTERVAL_EQUALS);
    }

    TEST(Union, OverlapsBefore) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        Interval b(BSON("" << 15 << "" << 25), true, true);
        a.combine(b);
        BSONObj itv = BSON("" << 10 << "" << 25);
        ASSERT_EQUALS(a.compare(Interval(itv, true, true)), Interval::INTERVAL_EQUALS);
    }

    TEST(Union, OverlapsAfter) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        Interval b(BSON("" << 5 << "" << 15), true, true);
        a.combine(b);
        BSONObj itv = BSON("" << 5 << "" << 20);
        ASSERT_EQUALS(a.compare(Interval(itv, true, true)), Interval::INTERVAL_EQUALS);
    }

    TEST(Union, Precedes) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        Interval b(BSON("" << 20 << "" << 30), true, true);
        a.combine(b);
        BSONObj itv = BSON("" << 10 << "" << 30);
        ASSERT_EQUALS(a.compare(Interval(itv, true, true)), Interval::INTERVAL_EQUALS);
    }

    TEST(Union, Succeds) {
        Interval a(BSON("" << 10 << "" << 20), true, true);
        Interval b(BSON("" << 0 << "" << 5), true, true);
        a.combine(b);
        BSONObj itv = BSON("" << 0 << "" << 20);
        ASSERT_EQUALS(a.compare(Interval(itv, true, true)), Interval::INTERVAL_EQUALS);
    }

} // unnamed namespace