// @tags: [
//   requires_fastcount,
//   requires_non_retryable_writes,
//   uses_multiple_connections,
//   uses_parallel_shell,
// ]

// Test db.loadServerScripts()

var testdb = db.getSisterDB("loadserverscripts");

jsTest.log("testing db.loadServerScripts()");
var x;

// assert._debug = true;

// clear out any data from old tests
testdb.system.js.remove({});

x = testdb.system.js.findOne();
assert.isnull(x, "Test for empty collection");

// User functions should not be defined yet
assert.eq(typeof myfunc, "undefined", "Checking that myfunc() is undefined");
assert.eq(typeof myfunc2, "undefined", "Checking that myfunc2() is undefined");

// Insert a function in the context of this process: make sure it's in the collection
testdb.system.js.insert({
    _id: "myfunc",
    "value": function() {
        return "myfunc";
    }
});
testdb.system.js.insert({_id: "mystring", "value": "var root = this;"});
testdb.system.js.insert({_id: "changeme", "value": false});

x = testdb.system.js.count();
assert.eq(x, 3, "Should now be one function in the system.js collection");

// Set a global variable that will be over-written
var changeme = true;

// Load that function
testdb.loadServerScripts();
assert.eq(typeof myfunc, "function", "Checking that myfunc() loaded correctly");
assert.eq(typeof mystring, "string", "Checking that mystring round-tripped correctly");
assert.eq(changeme, false, "Checking that global var was overwritten");

// Make sure it works
x = myfunc();
assert.eq(x, "myfunc", "Checking that myfunc() returns the correct value");

// Insert value into collection from another process
var coproc =
    startParallelShell('db.getSisterDB("loadserverscripts").system.js.insert' +
                       '    ( {_id: "myfunc2", "value": function(){ return "myfunc2"; } } );');
// wait for results
coproc();

// Make sure the collection's been updated
x = testdb.system.js.count();
assert.eq(x, 4, "Should now be two functions in the system.js collection");

// Load the new functions: test them as above
testdb.loadServerScripts();
assert.eq(typeof myfunc2, "function", "Checking that myfunc2() loaded correctly");
x = myfunc2();
assert.eq(x, "myfunc2", "Checking that myfunc2() returns the correct value");

jsTest.log("completed test of db.loadServerScripts()");