// Test the populating lastOpVisible field of the ReplSetMetadata.
// First we do a writeConcern-free write and ensure that a local read will return the same
// lastOpVisible, and that majority read with afterOpTime of lastOpVisible will return it as well.
// We then confirm that a writeConcern majority write will be seen as the lastVisibleOp by a
// majority read.
// @tags: [requires_majority_read_concern]
(function() {
"use strict";

var name = 'lastOpVisible';
var replTest = new ReplSetTest(
    {name: name, nodes: 3, nodeOptions: {enableMajorityReadConcern: ''}, waitForKeys: true});
replTest.startSet();
replTest.initiate();

var primary = replTest.getPrimary();

// Do an insert without writeConcern.
var res = primary.getDB(name).runCommandWithMetadata({insert: name, documents: [{x: 1}]},
                                                     {"$replData": 1});
assert.commandWorked(res.commandReply);
var last_op_visible = res.commandReply["$replData"].lastOpVisible;

// A find should return the same lastVisibleOp.
res = primary.getDB(name).runCommandWithMetadata({find: name, readConcern: {level: "local"}},
                                                 {"$replData": 1});
assert.commandWorked(res.commandReply);
assert.eq(last_op_visible, res.commandReply["$replData"].lastOpVisible);

// A majority readConcern with afterOpTime: lastOpVisible should also return the same
// lastVisibleOp.
res = primary.getDB(name).runCommandWithMetadata(
    {find: name, readConcern: {level: "majority", afterOpTime: last_op_visible}}, {"$replData": 1});
assert.commandWorked(res.commandReply);
assert.eq(last_op_visible, res.commandReply["$replData"].lastOpVisible);

// Do an insert without writeConcern.
res = primary.getDB(name).runCommandWithMetadata(
    {insert: name, documents: [{x: 1}], writeConcern: {w: "majority"}}, {"$replData": 1});
assert.commandWorked(res.commandReply);
last_op_visible = res.commandReply["$replData"].lastOpVisible;

// A majority readConcern should return the same lastVisibleOp.
res = primary.getDB(name).runCommandWithMetadata({find: name, readConcern: {level: "majority"}},
                                                 {"$replData": 1});
assert.commandWorked(res.commandReply);
assert.eq(last_op_visible, res.commandReply["$replData"].lastOpVisible);
replTest.stopSet();
}());