/*
 * Simple test to ensure that an invalid reconfig fails, a valid one succeeds, and a reconfig won't
 * succeed without force if force is needed.
 */
(function() {
"use strict";

// Skip db hash check because secondary is left with a different config.
TestData.skipCheckDBHashes = true;

var numNodes = 5;
var replTest = new ReplSetTest({name: 'testSet', nodes: numNodes});
var nodes = replTest.startSet();
replTest.initiate();

var primary = replTest.getPrimary();

replTest.awaitSecondaryNodes();

jsTestLog("Valid reconfig");
var config = primary.getDB("local").system.replset.findOne();
printjson(config);
config.version++;
config.members[nodes.indexOf(primary)].priority = 2;
assert.commandWorked(primary.getDB("admin").runCommand({replSetReconfig: config}));
// Successful reconfig writes a no-op into the oplog.
const expectedNoOp = {
    op: "n",
    o: {msg: "Reconfig set", version: config.version}
};
const primaryOplog = primary.getDB("local")['oplog.rs'];
const lastOp = primaryOplog.find(expectedNoOp).sort({'$natural': -1}).limit(1).toArray();
assert(lastOp.length > 0);
replTest.awaitReplication();

jsTestLog("Invalid reconfig");
config.version++;
var badMember = {_id: numNodes, host: "localhost:12345", priority: "High"};
config.members.push(badMember);
var invalidConfigCode = 93;
assert.commandFailedWithCode(primary.adminCommand({replSetReconfig: config}), invalidConfigCode);

jsTestLog("No force when needed.");
config.members = config.members.slice(0, numNodes - 1);
var secondary = replTest.getSecondary();
config.members[nodes.indexOf(secondary)].priority = 5;
var admin = secondary.getDB("admin");
var forceRequiredCode = 10107;
assert.commandFailedWithCode(admin.runCommand({replSetReconfig: config}), forceRequiredCode);

jsTestLog("Force when appropriate");
assert.commandWorked(admin.runCommand({replSetReconfig: config, force: true}));

// Wait for the last node to know it is REMOVED before stopping the test.
jsTestLog("Waiting for the last node to be REMOVED.");
assert.soonNoExcept(() => {
    assert.commandFailedWithCode(nodes[4].adminCommand({'replSetGetStatus': 1}),
                                 ErrorCodes.InvalidReplicaSetConfig);
    return true;
});
jsTestLog("Finished waiting for the last node to be REMOVED.");

replTest.stopSet();
}());