// Basic test of sharding with a hashed shard key
//  - Test basic migrations with moveChunk, using different chunk specification methods

var s = new ShardingTest( { name : jsTestName() , shards : 3 , mongos : 1, verbose : 1 } );
var dbname = "test";
var coll = "foo";
var ns = dbname + "." + coll;
var db = s.getDB( dbname );
var t = db.getCollection( coll );
db.adminCommand( { enablesharding : dbname } );
s.ensurePrimaryShard(dbname, 'shard0001');

// for simplicity start by turning off balancer
s.stopBalancer();

// shard a fresh collection using a hashed shard key
t.drop();
var res = db.adminCommand( { shardcollection : ns , key : { a : "hashed" } } );
assert.gt( s.config.chunks.count({ns:ns}), 3);
assert.eq( res.ok , 1 , "shardcollection didn't work" );
db.printShardingStatus();

// insert stuff
var numitems = 1000;
for(i = 0; i < numitems; i++ ){
    t.insert( { a: i } );
}
// check they all got inserted
assert.eq( t.find().count() , numitems , "count off after inserts" );
printjson( t.find().explain() );

// find a chunk that's not on shard0000
var chunk = s.config.chunks.findOne( {shard : {$ne  : "shard0000"} } );
assert.neq(chunk, null, "all chunks on shard0000!");    
printjson(chunk);

// try to move the chunk using an invalid specification method. should fail.
var res = db.adminCommand( { movechunk : ns ,
                             find : { a : 0 } ,
                             bounds : [ chunk.min , chunk.max ] ,
                             to:  "shard0000"  } );
assert.eq( res.ok , 0 , "moveChunk shouldn't work with invalid specification method");

// now move a chunk using the lower/upper bound method. should work.
var res = db.adminCommand( { movechunk : ns ,
                             bounds : [ chunk.min , chunk.max ] ,
                             to:  "shard0000"  } );
printjson( res );
assert.eq( res.ok , 1 , "movechunk using lower/upper bound method didn't work " );

// check count still correct.
assert.eq( t.find().itcount() , numitems , "count off after migrate" );
printjson( t.find().explain() );

// move a chunk using the find method
var res = db.adminCommand( { movechunk : ns , find : { a : 2 } , to:  "shard0002"  } );
printjson( res );
assert.eq( res.ok , 1 , "movechunk using find query didn't work" );

// check counts still correct
assert.eq( t.find().itcount() , numitems , "count off after migrate" );
printjson( t.find().explain() );

s.stop();