// Test balancing all chunks off of one shard
var st = new ShardingTest(
    {name: "balance_tags1", shards: 3, mongos: 1, other: {chunkSize: 1, enableBalancer: true}});

st.adminCommand({enablesharding: "test"});
st.ensurePrimaryShard('test', 'shard0001');

var db = st.getDB("test");

var bulk = db.foo.initializeUnorderedBulkOp();
for (i = 0; i < 21; i++) {
    bulk.insert({_id: i, x: i});
}
assert.writeOK(bulk.execute());

assert.commandWorked(st.s.adminCommand({shardCollection: 'test.foo', key: {_id: 1}}));

st.stopBalancer();

for (i = 0; i < 20; i++) {
    st.adminCommand({split: "test.foo", middle: {_id: i}});
}

st.startBalancer();

st.printShardingStatus();

// Wait for the initial balance to happen
assert.soon(function() {
    var counts = st.chunkCounts("foo");
    printjson(counts);
    return counts["shard0000"] == 7 && counts["shard0001"] == 7 && counts["shard0002"] == 7;
}, "balance 1 didn't happen", 1000 * 60 * 10, 1000);

// Quick test of some shell helpers and setting up state
sh.addShardTag("shard0000", "a");
assert.eq(["a"], st.config.shards.findOne({_id: "shard0000"}).tags);

sh.addShardTag("shard0000", "b");
assert.eq(["a", "b"], st.config.shards.findOne({_id: "shard0000"}).tags);

sh.removeShardTag("shard0000", "b");
assert.eq(["a"], st.config.shards.findOne({_id: "shard0000"}).tags);

sh.addShardTag("shard0001", "a");
sh.addTagRange("test.foo", {_id: -1}, {_id: 1000}, "a");

st.printShardingStatus();

// At this point, everything should drain off shard 2, which does not have the tag
assert.soon(function() {
    var counts = st.chunkCounts("foo");
    printjson(counts);
    return counts["shard0002"] == 0;
}, "balance 2 didn't happen", 1000 * 60 * 10, 1000);

st.printShardingStatus();

st.stop();