(function() {
'use strict';

var s = new ShardingTest({shards: 2});

// Make sure that findAndModify with upsert against a non-existent database and collection will
// implicitly create them both
assert.eq(undefined,
          assert.commandWorked(s.s0.adminCommand({listDatabases: 1, nameOnly: 1}))
              .databases.find((dbInfo) => {
                  return (dbInfo.name === 'NewUnshardedDB');
              }));

var newlyCreatedDb = s.getDB('NewUnshardedDB');
assert.eq(0, newlyCreatedDb.unsharded_coll.find({}).itcount());
newlyCreatedDb.unsharded_coll.findAndModify(
    {query: {_id: 1}, update: {$set: {Value: 'Value'}}, upsert: true});
assert.eq(1, newlyCreatedDb.unsharded_coll.find({}).itcount());

// Tests with sharded database
assert.commandWorked(s.s0.adminCommand({enablesharding: "test"}));
s.ensurePrimaryShard('test', s.shard1.shardName);
assert.commandWorked(s.s0.adminCommand({shardcollection: "test.sharded_coll", key: {_id: 1}}));

var db = s.getDB('test');

var numObjs = 20;

// Pre-split the collection so to avoid interference from auto-split
assert.commandWorked(s.s0.adminCommand({split: "test.sharded_coll", middle: {_id: numObjs / 2}}));
assert.commandWorked(s.s0.adminCommand(
    {movechunk: "test.sharded_coll", find: {_id: numObjs / 2}, to: s.shard0.shardName}));

var bulk = db.sharded_coll.initializeUnorderedBulkOp();
for (var i = 0; i < numObjs; i++) {
    bulk.insert({_id: i});
}
assert.commandWorked(bulk.execute());

// Put two docs in each chunk (avoid the split in 0, since there are no docs less than 0)
for (var i = 2; i < numObjs; i += 2) {
    if (i == numObjs / 2)
        continue;

    assert.commandWorked(s.s0.adminCommand({split: "test.sharded_coll", middle: {_id: i}}));
}

s.printChunks();
assert.eq(numObjs / 2, s.config.chunks.count({"ns": "test.sharded_coll"}), 'Split was incorrect');
assert.eq(numObjs / 4,
          s.config.chunks.count({shard: s.shard0.shardName, "ns": "test.sharded_coll"}));
assert.eq(numObjs / 4,
          s.config.chunks.count({shard: s.shard1.shardName, "ns": "test.sharded_coll"}));

// update
for (var i = 0; i < numObjs; i++) {
    assert.eq(db.sharded_coll.count({b: 1}), i, "2 A");

    var out = db.sharded_coll.findAndModify({query: {_id: i, b: null}, update: {$set: {b: 1}}});
    assert.eq(out._id, i, "2 E");

    assert.eq(db.sharded_coll.count({b: 1}), i + 1, "2 B");
}

// remove
for (var i = 0; i < numObjs; i++) {
    assert.eq(db.sharded_coll.count(), numObjs - i, "3 A");
    assert.eq(db.sharded_coll.count({_id: i}), 1, "3 B");

    var out = db.sharded_coll.findAndModify({remove: true, query: {_id: i}});

    assert.eq(db.sharded_coll.count(), numObjs - i - 1, "3 C");
    assert.eq(db.sharded_coll.count({_id: i}), 0, "3 D");
    assert.eq(out._id, i, "3 E");
}

s.stop();
})();