/**
 * Test replication metrics
 */
function testSecondaryMetrics(secondary, opCount, offset) {
    var ss = secondary.getDB("test").serverStatus()
    printjson(ss.metrics)

    assert(ss.metrics.repl.network.readersCreated > 0, "no (oplog) readers created")
    assert(ss.metrics.repl.network.getmores.num > 0, "no getmores")
    assert(ss.metrics.repl.network.getmores.totalMillis > 0, "no getmores time")
    // the first oplog entry may ore may not make it into network.ops now that we have two 
    // n ops (initiate and new primary) before steady replication starts
    assert.lte(ss.metrics.repl.network.ops, opCount + offset + 1, "wrong number of ops retrieved")
    assert.gte(ss.metrics.repl.network.ops, opCount + offset, "wrong number of ops retrieved")
    assert(ss.metrics.repl.network.bytes > 0, "zero or missing network bytes")

    assert(ss.metrics.repl.buffer.count >= 0, "buffer count missing")
    assert(ss.metrics.repl.buffer.sizeBytes >= 0, "size (bytes)] missing")
    assert(ss.metrics.repl.buffer.maxSizeBytes >= 0, "maxSize (bytes) missing")

    assert(ss.metrics.repl.preload.docs.num >= 0, "preload.docs num  missing")
    assert(ss.metrics.repl.preload.docs.totalMillis  >= 0, "preload.docs time missing")
    assert(ss.metrics.repl.preload.docs.num >= 0, "preload.indexes num missing")
    assert(ss.metrics.repl.preload.indexes.totalMillis >= 0, "preload.indexes time missing")

    assert(ss.metrics.repl.apply.batches.num > 0, "no batches")
    assert(ss.metrics.repl.apply.batches.totalMillis >= 0, "missing batch time")
    assert.eq(ss.metrics.repl.apply.ops, opCount + offset, "wrong number of applied ops")
}

var rt = new ReplSetTest( { name : "server_status_metrics" , nodes: 2, oplogSize: 100 } );
rt.startSet()
rt.initiate()

rt.awaitSecondaryNodes();

var secondary = rt.getSecondary();
var primary = rt.getPrimary();
var testDB = primary.getDB("test");

assert.commandWorked(testDB.createCollection('a'));
assert.writeOK(testDB.b.insert({}, { writeConcern: { w: 2 }}));

var ss = secondary.getDB("test").serverStatus();
var secondaryBaseOplogInserts = ss.metrics.repl.apply.ops;

//add test docs
var bulk = testDB.a.initializeUnorderedBulkOp();
for(x = 0; x < 1000; x++) {
    bulk.insert({});
}
assert.writeOK(bulk.execute({ w: 2 }));

testSecondaryMetrics(secondary, 1000, secondaryBaseOplogInserts );

var options = { writeConcern: { w: 2 }, multi: true, upsert: true };
assert.writeOK(testDB.a.update({}, { $set: { d: new Date() }}, options));

testSecondaryMetrics(secondary, 2000, secondaryBaseOplogInserts );

// Test getLastError.wtime and that it only records stats for w > 1, see SERVER-9005
var startMillis = testDB.serverStatus().metrics.getLastError.wtime.totalMillis
var startNum = testDB.serverStatus().metrics.getLastError.wtime.num

printjson(primary.getDB("test").serverStatus().metrics);

assert.writeOK(testDB.a.insert({ x: 1 }, { writeConcern: { w: 1, wtimeout: 5000 }}));
assert.eq(testDB.serverStatus().metrics.getLastError.wtime.totalMillis, startMillis);
assert.eq(testDB.serverStatus().metrics.getLastError.wtime.num, startNum);

assert.writeOK(testDB.a.insert({ x: 1 }, { writeConcern: { w: -11, wtimeout: 5000 }}));
assert.eq(testDB.serverStatus().metrics.getLastError.wtime.totalMillis, startMillis);
assert.eq(testDB.serverStatus().metrics.getLastError.wtime.num, startNum);

assert.writeOK(testDB.a.insert({ x: 1 }, { writeConcern: { w: 2, wtimeout: 5000 }}));
assert(testDB.serverStatus().metrics.getLastError.wtime.totalMillis >= startMillis);
assert.eq(testDB.serverStatus().metrics.getLastError.wtime.num, startNum + 1);

// Write will fail because there are only 2 nodes
assert.writeError(testDB.a.insert({ x: 1 }, { writeConcern: { w: 3, wtimeout: 50 }}));
assert.eq(testDB.serverStatus().metrics.getLastError.wtime.num, startNum + 2);

printjson(primary.getDB("test").serverStatus().metrics);

rt.stopSet();