/**
 * Perform basic tests for the split command against mongos.
 */
(function() {
'use strict';

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

var st = new ShardingTest({mongos: 2, shards: 2, other: {chunkSize: 1}});
var configDB = st.s0.getDB('config');

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

// split on invalid ns.
assert.commandFailed(configDB.adminCommand({split: 'user', key: {_id: 1}}));

// split on unsharded collection (db is not sharding enabled).
assert.commandFailed(configDB.adminCommand({split: 'test.user', key: {_id: 1}}));

assert.commandWorked(configDB.adminCommand({enableSharding: 'test'}));
st.ensurePrimaryShard('test', shard0);

// split on unsharded collection (db is sharding enabled).
assert.commandFailed(configDB.adminCommand({split: 'test.user', key: {_id: 1}}));

assert.commandWorked(configDB.adminCommand({shardCollection: 'test.user', key: {_id: 1}}));

assert.eq(null, findChunksUtil.findOneChunkByNs(configDB, 'test.user', {min: {_id: 0}}));

assert.commandWorked(configDB.adminCommand({split: 'test.user', middle: {_id: 0}}));
assert.neq(null, findChunksUtil.findOneChunkByNs(configDB, 'test.user', {min: {_id: 0}}));

// Cannot split on existing chunk boundary.
assert.commandFailed(configDB.adminCommand({split: 'test.user', middle: {_id: 0}}));

// Attempt to split on a value that is not the shard key.
assert.commandFailed(configDB.adminCommand({split: 'test.user', middle: {x: 100}}));
assert.commandFailed(configDB.adminCommand({split: 'test.user', find: {x: 100}}));
assert.commandFailed(
    configDB.adminCommand({split: 'test.user', bounds: [{x: MinKey}, {x: MaxKey}]}));

// Insert documents large enough to fill up a chunk
var kiloDoc = new Array(1024).join('x');
var testDB = st.s.getDB('test');
var bulk = testDB.user.initializeUnorderedBulkOp();
for (var x = -1200; x < 1200; x++) {
    bulk.insert({_id: x, val: kiloDoc});
}
assert.commandWorked(bulk.execute());

assert.eq(1,
          findChunksUtil.findChunksByNs(configDB, 'test.user', {min: {$gte: {_id: 0}}}).itcount());

// Errors if bounds do not correspond to existing chunk boundaries.
assert.commandFailed(configDB.adminCommand({split: 'test.user', bounds: [{_id: 0}, {_id: 1000}]}));
assert.eq(1,
          findChunksUtil.findChunksByNs(configDB, 'test.user', {min: {$gte: {_id: 0}}}).itcount());

assert.commandWorked(
    configDB.adminCommand({split: 'test.user', bounds: [{_id: 0}, {_id: MaxKey}]}));
assert.gt(findChunksUtil.findChunksByNs(configDB, 'test.user', {min: {$gte: {_id: 0}}}).itcount(),
          1);

assert.eq(1,
          findChunksUtil.findChunksByNs(configDB, 'test.user', {min: {$lt: {_id: 0}}}).itcount());
assert.commandWorked(configDB.adminCommand({split: 'test.user', middle: {_id: -600}}));
assert.gt(findChunksUtil.findChunksByNs(configDB, 'test.user', {min: {$lt: {_id: 0}}}).itcount(),
          1);

// Mongos must refresh metadata if the chunk version does not match
assert.commandWorked(st.s0.adminCommand(
    {moveChunk: 'test.user', find: {_id: -900}, to: shard1, _waitForDelete: true}));
assert.commandWorked(st.s1.adminCommand({split: 'test.user', middle: {_id: -900}}));
assert.commandWorked(st.s1.adminCommand(
    {moveChunk: 'test.user', find: {_id: -900}, to: shard0, _waitForDelete: true}));
assert.commandWorked(st.s1.adminCommand(
    {moveChunk: 'test.user', find: {_id: -901}, to: shard0, _waitForDelete: true}));
assert.eq(0, findChunksUtil.findChunksByNs(configDB, 'test.user', {shard: shard1}).itcount());

//
// Compound Key
//

assert.commandWorked(configDB.adminCommand({shardCollection: 'test.compound', key: {x: 1, y: 1}}));

assert.eq(null, findChunksUtil.findOneChunkByNs(configDB, 'test.compound', {min: {x: 0, y: 0}}));
assert.commandWorked(configDB.adminCommand({split: 'test.compound', middle: {x: 0, y: 0}}));
assert.neq(null, findChunksUtil.findOneChunkByNs(configDB, 'test.compound', {min: {x: 0, y: 0}}));

// cannot split on existing chunk boundary.
assert.commandFailed(configDB.adminCommand({split: 'test.compound', middle: {x: 0, y: 0}}));

bulk = testDB.compound.initializeUnorderedBulkOp();
for (x = -1200; x < 1200; x++) {
    bulk.insert({x: x, y: x, val: kiloDoc});
}
assert.commandWorked(bulk.execute());

assert.eq(1,
          findChunksUtil.findChunksByNs(configDB, 'test.compound', {min: {$gte: {x: 0, y: 0}}})
              .itcount());
assert.commandWorked(configDB.adminCommand(
    {split: 'test.compound', bounds: [{x: 0, y: 0}, {x: MaxKey, y: MaxKey}]}));
assert.gt(
    findChunksUtil.findChunksByNs(configDB, 'test.compound', {min: {$gte: {x: 0, y: 0}}}).itcount(),
    1);

assert.eq(
    1,
    findChunksUtil.findChunksByNs(configDB, 'test.compound', {min: {$lt: {x: 0, y: 0}}}).itcount());
assert.commandWorked(configDB.adminCommand({split: 'test.compound', find: {x: -1, y: -1}}));
assert.gt(
    findChunksUtil.findChunksByNs(configDB, 'test.compound', {min: {$lt: {x: 0, y: 0}}}).itcount(),
    1);

st.stop();
})();