(function() {

    var s = new ShardingTest({name: "count1", shards: 2});
    var db = s.getDB("test");

    // ************** Test Set #1 *************
    // Basic counts on "bar" collections, not yet sharded

    db.bar.save({n: 1});
    db.bar.save({n: 2});
    db.bar.save({n: 3});

    assert.eq(3, db.bar.find().count(), "bar 1");
    assert.eq(1, db.bar.find({n: 1}).count(), "bar 2");

    //************** Test Set #2 *************
    // Basic counts on sharded  "foo" collection.
    // 1. Create foo collection, insert 6 docs
    // 2. Divide into three chunks
    // 3. Test counts before chunk migrations
    // 4. Manually move chunks.  Now each shard should have 3 docs.
    // 5. i. Test basic counts on foo
    //    ii. Test counts with limit
    //    iii. Test counts with skip
    //    iv. Test counts with skip + limit
    //    v. Test counts with skip + limit + sorting
    // 6. Insert 10 more docs. Further limit/skip testing with a find query
    // 7. test invalid queries/values

    // part 1
    s.adminCommand({enablesharding: "test"});
    s.ensurePrimaryShard('test', 'shard0001');
    s.adminCommand({shardcollection: "test.foo", key: {name: 1}});

    primary = s.getPrimaryShard("test").getDB("test");
    secondary = s.getOther(primary).getDB("test");

    assert.eq(1, s.config.chunks.count({"ns": "test.foo"}), "sanity check A");

    db.foo.save({_id: 1, name: "eliot"});
    db.foo.save({_id: 2, name: "sara"});
    db.foo.save({_id: 3, name: "bob"});
    db.foo.save({_id: 4, name: "joe"});
    db.foo.save({_id: 5, name: "mark"});
    db.foo.save({_id: 6, name: "allan"});

    assert.eq(6, db.foo.find().count(), "basic count");

    // part 2
    s.adminCommand({split: "test.foo", middle: {name: "allan"}});
    s.adminCommand({split: "test.foo", middle: {name: "sara"}});
    s.adminCommand({split: "test.foo", middle: {name: "eliot"}});

    // MINKEY->allan,bob->eliot,joe,mark->sara,MAXKEY

    s.printChunks();

    // part 3
    assert.eq(6, db.foo.find().count(), "basic count after split ");
    assert.eq(6, db.foo.find().sort({name: 1}).count(), "basic count after split sorted ");

    // part 4
    s.adminCommand({
        movechunk: "test.foo",
        find: {name: "eliot"},
        to: secondary.getMongo().name,
        _waitForDelete: true
    });

    assert.eq(3, primary.foo.find().toArray().length, "primary count");
    assert.eq(3, secondary.foo.find().toArray().length, "secondary count");
    assert.eq(3, primary.foo.find().sort({name: 1}).toArray().length, "primary count sorted");
    assert.eq(3, secondary.foo.find().sort({name: 1}).toArray().length, "secondary count sorted");

    // part 5
    // Some redundant tests, but better safe than sorry. These are fast tests, anyway.

    // i.
    assert.eq(6, db.foo.find().count(), "total count after move");
    assert.eq(6, db.foo.find().toArray().length, "total count after move");
    assert.eq(6, db.foo.find().sort({name: 1}).toArray().length, "total count() sorted");
    assert.eq(6, db.foo.find().sort({name: 1}).count(), "total count with count() after move");

    // ii.
    assert.eq(2, db.foo.find().limit(2).count(true));
    assert.eq(2, db.foo.find().limit(-2).count(true));
    assert.eq(6, db.foo.find().limit(100).count(true));
    assert.eq(6, db.foo.find().limit(-100).count(true));
    assert.eq(6, db.foo.find().limit(0).count(true));

    // iii.
    assert.eq(6, db.foo.find().skip(0).count(true));
    assert.eq(5, db.foo.find().skip(1).count(true));
    assert.eq(4, db.foo.find().skip(2).count(true));
    assert.eq(3, db.foo.find().skip(3).count(true));
    assert.eq(2, db.foo.find().skip(4).count(true));
    assert.eq(1, db.foo.find().skip(5).count(true));
    assert.eq(0, db.foo.find().skip(6).count(true));
    assert.eq(0, db.foo.find().skip(7).count(true));

    // iv.
    assert.eq(2, db.foo.find().limit(2).skip(1).count(true));
    assert.eq(2, db.foo.find().limit(-2).skip(1).count(true));
    assert.eq(5, db.foo.find().limit(100).skip(1).count(true));
    assert.eq(5, db.foo.find().limit(-100).skip(1).count(true));
    assert.eq(5, db.foo.find().limit(0).skip(1).count(true));

    assert.eq(0, db.foo.find().limit(2).skip(10).count(true));
    assert.eq(0, db.foo.find().limit(-2).skip(10).count(true));
    assert.eq(0, db.foo.find().limit(100).skip(10).count(true));
    assert.eq(0, db.foo.find().limit(-100).skip(10).count(true));
    assert.eq(0, db.foo.find().limit(0).skip(10).count(true));

    assert.eq(2, db.foo.find().limit(2).itcount(), "LS1");
    assert.eq(2, db.foo.find().skip(2).limit(2).itcount(), "LS2");
    assert.eq(1, db.foo.find().skip(5).limit(2).itcount(), "LS3");
    assert.eq(6, db.foo.find().limit(2).count(), "LSC1");
    assert.eq(2, db.foo.find().limit(2).size(), "LSC2");
    assert.eq(2, db.foo.find().skip(2).limit(2).size(), "LSC3");
    assert.eq(1, db.foo.find().skip(5).limit(2).size(), "LSC4");
    assert.eq(4, db.foo.find().skip(1).limit(4).size(), "LSC5");
    assert.eq(5, db.foo.find().skip(1).limit(6).size(), "LSC6");

    // SERVER-3567 older negative limit tests
    assert.eq(2, db.foo.find().limit(2).itcount(), "N1");
    assert.eq(2, db.foo.find().limit(-2).itcount(), "N2");
    assert.eq(2, db.foo.find().skip(4).limit(2).itcount(), "N3");
    assert.eq(2, db.foo.find().skip(4).limit(-2).itcount(), "N4");

    // v.
    function nameString(c) {
        var s = "";
        while (c.hasNext()) {
            var o = c.next();
            if (s.length > 0)
                s += ",";
            s += o.name;
        }
        return s;
    }
    assert.eq("allan,bob,eliot,joe,mark,sara", nameString(db.foo.find().sort({name: 1})), "sort 1");
    assert.eq(
        "sara,mark,joe,eliot,bob,allan", nameString(db.foo.find().sort({name: -1})), "sort 2");

    assert.eq("allan,bob", nameString(db.foo.find().sort({name: 1}).limit(2)), "LSD1");
    assert.eq("bob,eliot", nameString(db.foo.find().sort({name: 1}).skip(1).limit(2)), "LSD2");
    assert.eq("joe,mark", nameString(db.foo.find().sort({name: 1}).skip(3).limit(2)), "LSD3");

    assert.eq("eliot,sara", nameString(db.foo.find().sort({_id: 1}).limit(2)), "LSE1");
    assert.eq("sara,bob", nameString(db.foo.find().sort({_id: 1}).skip(1).limit(2)), "LSE2");
    assert.eq("joe,mark", nameString(db.foo.find().sort({_id: 1}).skip(3).limit(2)), "LSE3");

    // part 6
    for (i = 0; i < 10; i++) {
        db.foo.save({_id: 7 + i, name: "zzz" + i});
    }

    assert.eq(10, db.foo.find({name: {$gt: "z"}}).itcount(), "LSF1");
    assert.eq(10, db.foo.find({name: {$gt: "z"}}).sort({_id: 1}).itcount(), "LSF2");
    assert.eq(5, db.foo.find({name: {$gt: "z"}}).sort({_id: 1}).skip(5).itcount(), "LSF3");
    assert.eq(3, db.foo.find({name: {$gt: "z"}}).sort({_id: 1}).skip(5).limit(3).itcount(), "LSF4");

    // part 7
    // Make sure count command returns error for invalid queries
    var badCmdResult = db.runCommand({count: 'foo', query: {$c: {$abc: 3}}});
    assert(!badCmdResult.ok, "invalid query syntax didn't return error");
    assert(badCmdResult.errmsg.length > 0, "no error msg for invalid query");

    // Negative skip values should return error
    var negSkipResult = db.runCommand({count: 'foo', skip: -2});
    assert(!negSkipResult.ok, "negative skip value shouldn't work");
    assert(negSkipResult.errmsg.length > 0, "no error msg for negative skip");

    // Negative skip values with positive limit should return error
    var negSkipLimitResult = db.runCommand({count: 'foo', skip: -2, limit: 1});
    assert(!negSkipLimitResult.ok, "negative skip value with limit shouldn't work");
    assert(negSkipLimitResult.errmsg.length > 0, "no error msg for negative skip");

    s.stop();

})();