// SERVER-36438 Ensure the 4.2 cloneDatabase() shell helper still successfully executes the clone
// command on a 4.0 server, now that the clone command has been removed as of 4.2.
(function() {
    "use strict";
    const oldVersion = "4.0";

    let numDocs = 2000;

    // 1kb string
    let str = new Array(1000).toString();

    let replsetDBName = "cloneDBreplset";
    let standaloneDBName = "cloneDBstandalone";
    let testColName = "foo";
    let testViewName = "view";

    jsTest.log("Create replica set");
    let replTest =
        new ReplSetTest({name: "testSet", nodes: 3, nodeOptions: {binVersion: oldVersion}});
    replTest.startSet();
    replTest.initiate();
    let master = replTest.getPrimary();
    let masterDB = master.getDB(replsetDBName);
    masterDB.dropDatabase();

    jsTest.log("Create standalone server");
    let standalone = MongoRunner.runMongod({binVersion: oldVersion});
    let standaloneDB = standalone.getDB(replsetDBName);
    standaloneDB.dropDatabase();

    jsTest.log("Insert data into replica set");
    let bulk = masterDB[testColName].initializeUnorderedBulkOp();
    for (let i = 0; i < numDocs; i++) {
        bulk.insert({x: i, text: str});
    }
    assert.writeOK(bulk.execute({w: 3}));

    jsTest.log("Create view on replica set");
    assert.commandWorked(masterDB.runCommand({create: testViewName, viewOn: testColName}));

    // Make sure all writes have replicated to secondary.
    replTest.awaitReplication();

    jsTest.log("Clone db from replica set to standalone server");
    standaloneDB.cloneDatabase(replTest.getURL());
    assert.eq(numDocs,
              standaloneDB[testColName].find().itcount(),
              "cloneDatabase from replset to standalone failed (document counts do not match)");
    assert.eq(numDocs,
              standaloneDB[testViewName].find().itcount(),
              "cloneDatabase from replset to standalone failed (count on view incorrect)");

    jsTest.log("Clone db from replica set PRIMARY to standalone server");
    standaloneDB.dropDatabase();
    standaloneDB.cloneDatabase(master.host);
    assert.eq(numDocs,
              standaloneDB[testColName].find().itcount(),
              "cloneDatabase from PRIMARY to standalone failed (document counts do not match)");
    assert.eq(numDocs,
              standaloneDB[testViewName].find().itcount(),
              "cloneDatabase from PRIMARY to standalone failed (count on view incorrect)");

    jsTest.log("Shut down replica set and standalone server");
    MongoRunner.stopMongod(standalone);

    replTest.stopSet();
})();