// SERVER-13702
// Some commands allow optional query, e.g. count, mapreduce.
// If the optional query is not given, mongos will wrongly use the command
// BSONObj itself as the query to target shards, which could return wrong
// shards if the shard key happens to be one of the fields in the command object.
(function() {
'use strict';

var s = new ShardingTest({shards: 2});
assert.commandWorked(s.s0.adminCommand({enablesharding: "test"}));
s.ensurePrimaryShard('test', s.shard1.shardName);

var db = s.getDB("test");
var res;

//
// Target count command
//

// Shard key is the same with command name.
s.shardColl("foo", {count: 1}, {count: ""});

for (var i = 0; i < 50; i++) {
    db.foo.insert({count: i});       // chunk [MinKey, ""), including numbers
    db.foo.insert({count: "" + i});  // chunk ["", MaxKey]
}

var theOtherShard = s.getOther(s.getPrimaryShard("test")).name;
s.printShardingStatus();

// Count documents on both shards

// "count" commnad with "query" option { }.
assert.eq(db.foo.count(), 100);
// Optional "query" option is not given.
res = db.foo.runCommand("count");
assert.eq(res.n, 100);

//
// Target mapreduce command
//
db.foo.drop();

// Shard key is the same with command name.
s.shardColl("foo", {mapReduce: 1}, {mapReduce: ""});

for (var i = 0; i < 50; i++) {
    db.foo.insert({mapReduce: i});       // to the chunk including number
    db.foo.insert({mapReduce: "" + i});  // to the chunk including string
}

s.printShardingStatus();

function m() {
    emit("total", 1);
}
function r(k, v) {
    return Array.sum(v);
}
res = db.foo.runCommand({mapReduce: "foo", map: m, reduce: r, out: {inline: 1}});

// Count documents on both shards
assert.eq(res.results[0].value, 100);

s.stop();
})();