(function() {
'use strict';

var coll = db.sort1;
coll.drop();

coll.save({x: 3, z: 33});
coll.save({x: 5, z: 33});
coll.save({x: 2, z: 33});
coll.save({x: 3, z: 33});
coll.save({x: 1, z: 33});

for (var pass = 0; pass < 2; pass++) {
    assert(coll.find().sort({x: 1})[0].x == 1);
    assert(coll.find().sort({x: 1}).skip(1)[0].x == 2);
    assert(coll.find().sort({x: -1})[0].x == 5);
    assert(coll.find().sort({x: -1})[1].x == 3);
    assert.eq(coll.find().sort({x: -1}).skip(0)[0].x, 5);
    assert.eq(coll.find().sort({x: -1}).skip(1)[0].x, 3);
    coll.ensureIndex({x: 1});
}

assert(coll.validate().valid);

coll.drop();
coll.save({x: 'a'});
coll.save({x: 'aba'});
coll.save({x: 'zed'});
coll.save({x: 'foo'});

for (var pass = 0; pass < 2; pass++) {
    assert.eq("a", coll.find().sort({'x': 1}).limit(1).next().x, "c.1");
    assert.eq("a", coll.find().sort({'x': 1}).next().x, "c.2");
    assert.eq("zed", coll.find().sort({'x': -1}).limit(1).next().x, "c.3");
    assert.eq("zed", coll.find().sort({'x': -1}).next().x, "c.4");
    coll.ensureIndex({x: 1});
}

assert(coll.validate().valid);

// Ensure that sorts with a collation and no index return the correct ordering. Here we use the
// 'numericOrdering' option which orders number-like strings by their numerical values.
if (db.getMongo().useReadCommands()) {
    coll.drop();
    assert.commandWorked(coll.insert({_id: 0, str: '1000'}));
    assert.commandWorked(coll.insert({_id: 1, str: '5'}));
    assert.commandWorked(coll.insert({_id: 2, str: '200'}));

    var cursor = coll.find().sort({str: -1}).collation({locale: 'en_US', numericOrdering: true});
    assert.eq(cursor.next(), {_id: 0, str: '1000'});
    assert.eq(cursor.next(), {_id: 2, str: '200'});
    assert.eq(cursor.next(), {_id: 1, str: '5'});
    assert(!cursor.hasNext());
}

// Ensure that sorting of arrays correctly respects a collation with numeric ordering.
if (db.getMongo().useReadCommands()) {
    coll.drop();
    assert.commandWorked(coll.insert({_id: 0, strs: ['1000', '500']}));
    assert.commandWorked(coll.insert({_id: 1, strs: ['2000', '60']}));
    cursor = coll.find({strs: {$lt: '1000'}}).sort({strs: 1}).collation({
        locale: 'en_US',
        numericOrdering: true
    });
    assert.eq(cursor.next(), {_id: 1, strs: ['2000', '60']});
    assert.eq(cursor.next(), {_id: 0, strs: ['1000', '500']});
    assert(!cursor.hasNext());
}
})();