//
// Basic tests for mergeChunks
//

(function() {
'use strict';

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

var mongos = st.s0;

var kDbName = 'db';

var shards = mongos.getCollection('config.shards').find().toArray();

var shard0 = shards[0]._id;
var shard1 = shards[1]._id;

var ns = kDbName + ".foo";

assert.commandWorked(mongos.adminCommand({enableSharding : kDbName}));

st.ensurePrimaryShard(kDbName, shard0);

// Fail if invalid namespace.
assert.commandFailed(mongos.adminCommand({mergeChunks: '', bounds: [ {a: -1}, {a: 1} ]}));

// Fail if database does not exist.
assert.commandFailed(mongos.adminCommand({mergeChunks: 'a.b', bounds: [ {a: -1}, {a: 1} ]}));

// Fail if collection is unsharded. 
assert.commandFailed(mongos.adminCommand({mergeChunks: kDbName + '.xxx', 
                                          bounds: [ {a: -1}, {a: 1} ]}));

// Errors if either bounds is not a valid shard key.
assert.eq(0, mongos.getDB('config').chunks.count({ns: ns}));
assert.commandWorked(mongos.adminCommand({shardCollection: ns, key: {a: 1}}));
assert.eq(1, mongos.getDB('config').chunks.count({ns: ns}));
assert.commandWorked(mongos.adminCommand({split: ns, middle: {a: 0}}));
assert.commandWorked(mongos.adminCommand({split: ns, middle: {a: -1}}));
assert.commandWorked(mongos.adminCommand({split: ns, middle: {a: 1}}));

 
assert.commandFailed(mongos.adminCommand({mergeChunks: ns, 
                                         bounds: [ {x: -1}, {a: 1} ]}));


// Fail if a wrong key.
assert.commandFailed(mongos.adminCommand({mergeChunks: ns, 
                                         bounds: [ {a: -1}, {x: 1} ]}));

// Fail if chunks do not contain a bound.
assert.commandFailed(mongos.adminCommand({mergeChunks: ns, bounds: [{a: -1}, {a: 10}]}));

// Validate metadata.
// There are four chunks [{$minKey, -1}, {-1, 0}, {0, 1}, {1, $maxKey}]
assert.eq(4, mongos.getDB('config').chunks.count({ns: ns}));
assert.commandWorked(mongos.adminCommand({mergeChunks: ns, bounds: [{a: -1}, {a:  1}]}));
assert.eq(3, mongos.getDB('config').chunks.count({ns: ns}));
assert.eq(1, mongos.getDB('config').chunks.count({ns: ns, min: {a: -1}, max: {a: 1}}));

st.stop();

})()