//
// Tests that the changelog entry for moveChunk.commit contains stats on the migration.
//

(function() {
'use strict';

load("jstests/sharding/libs/find_chunks_util.js");

var st = new ShardingTest({mongos: 1, shards: 2});
var kDbName = 'db';

var mongos = st.s0;
var shard0 = st.shard0.shardName;
var shard1 = st.shard1.shardName;

assert.commandWorked(mongos.adminCommand({enableSharding: kDbName}));
st.ensurePrimaryShard(kDbName, shard0);

function assertCountsInChangelog() {
    let changeLog = st.s.getDB('config').changelog.find({what: 'moveChunk.commit'}).toArray();
    assert.gt(changeLog.length, 0);
    for (let i = 0; i < changeLog.length; i++) {
        assert(changeLog[i].details.hasOwnProperty('counts'));
    }
}

var ns = kDbName + '.fooHashed';
assert.commandWorked(mongos.adminCommand({shardCollection: ns, key: {_id: 'hashed'}}));

var aChunk = findChunksUtil.findOneChunkByNs(mongos.getDB('config'), ns, {shard: shard0});
assert(aChunk);

// Assert counts field exists in the changelog entry for moveChunk.commit
assert.commandWorked(
    mongos.adminCommand({moveChunk: ns, bounds: [aChunk.min, aChunk.max], to: shard1}));
assertCountsInChangelog();

mongos.getDB(kDbName).fooHashed.drop();

st.stop();
})();