// Check --port= edge behaviors.

(function() {
'use strict';
jsTest.log("Setting port=0 is okay unless binding to multiple IP interfaces.");

function runTest(bindIP, expectOk) {
    jsTest.log("".concat("Testing with bindIP=[", bindIP, "], expectOk=[", expectOk, "]"));

    clearRawMongoProgramOutput();

    let pid = startMongoProgramNoConnect(
        "mongod", "--ipv6", "--dbpath", MongoRunner.dataDir, "--bind_ip", bindIP, "--port", 0);
    jsTest.log("".concat("pid=[", pid, "]"));

    if (expectOk) {
        let port;

        // We use assert.soonNoExcept() here because the mongod may not be logging yet.
        assert.soonNoExcept(() => {
            const logContents = rawMongoProgramOutput();
            const found = logContents.match(
                /"id":23016,\s*"ctx":"listener","msg":"Waiting for connections","attr":{"port":(\d+)/);
            if (found !== null) {
                print("Found message from mongod with port it is listening on: " + found[0]);
                port = found[1];
                return true;
            }
        });

        const connStr = `127.0.0.1:${port}`;
        print("Attempting to connect to " + connStr);

        let conn;
        assert.soonNoExcept(() => {
            conn = new Mongo(connStr);
            return true;
        });
        assert.commandWorked(conn.adminCommand({ping: 1}));

        stopMongoProgramByPid(pid);
    } else {
        const ec = waitProgram(pid);
        assert.eq(ec, MongoRunner.EXIT_NET_ERROR);
        assert.soonNoExcept(() => {
            const logContents = rawMongoProgramOutput();
            const found = logContents.match(
                /Port 0 \(ephemeral port\) is not allowed when listening on multiple IP interfaces/);
            return (found !== null);
        }, "No warning issued for invalid port=0 usage");
    }
}

runTest("127.0.0.1", true);
runTest("127.0.0.1,::1", false);
}());