var coll = "numbers";

db[coll].drop();
for (i = 0; i < 100; i++) {
    db[coll].save({_id: i, mod: [i % 2, i % 3, i % 5]});
}

print("-----LIMIT-----");

print("normal limit");
var doc = db.runCommand({aggregate: coll, pipeline: [{$limit: 2}]});
assert.eq(doc.result.length, 2, tojson(doc));

print("limit larger than result size");
doc = db.runCommand({aggregate: coll, pipeline: [{$limit: 200}]});
assert.eq(doc.result.length, 100, tojson(doc));

print("limit on sort");
doc = db.runCommand({aggregate: coll, pipeline: [{$sort: {_id: -1}}, {$limit: 3}]});
r = doc.result;
assert.eq(doc.result.length, 3);
for (var i = 0; i < r; i++) {
    assert.eq(100 - r[i]._id, i, tojson(doc));
}

print("TODO: invalid limit");  // once assert has been replaced with uassert

print("-----SKIP------");

print("normal skip");
doc = db.runCommand({aggregate: coll, pipeline: [{$skip: 95}]});
assert.eq(doc.result.length, 5, tojson(doc));

print("skip larger than result size");
doc = db.runCommand({aggregate: coll, pipeline: [{$skip: 102}]});
assert.eq(doc.result.length, 0, tojson(doc));

print("check skip results");
doc = db.runCommand({aggregate: coll, pipeline: [{$sort: {_id: 1}}, {$skip: 6}, {$limit: 3}]});
assert.eq(doc.result.length, 3, tojson(doc));
for (var i = 0; i < 3; i++) {
    assert.eq(i + 6, doc.result[i]._id, tojson(doc));
}

print("TODO: invalid skip");  // once assert has been replaced with uassert

print("on virtual collection");
doc = db.runCommand({
    aggregate: coll,
    pipeline: [
        {$unwind: "$mod"},
        {$project: {m: "$mod"}},
        {$sort: {m: 1, _id: -1}},
        {$skip: 150},
        {$limit: 5}
    ]
});

assert.eq(doc.result.length, 5);
for (var i = 0; i < 5; i++) {
    assert.eq(1, doc.result[i].m, tojson(doc));
}
assert.eq(doc.result[0]._id, 55, tojson(doc));
assert.eq(doc.result[1]._id, 53, tojson(doc));
assert.eq(doc.result[2]._id, 52, tojson(doc));
assert.eq(doc.result[3]._id, 51, tojson(doc));
assert.eq(doc.result[4]._id, 51, tojson(doc));

print("size 0 collection");
db[coll].drop();

doc = db.runCommand({aggregate: coll, pipeline: [{$skip: 6}]});
assert.eq(doc.ok, 1);
assert.eq(doc.result.length, 0);

doc = db.runCommand({aggregate: coll, pipeline: [{$limit: 3}]});
assert.eq(doc.ok, 1);
assert.eq(doc.result.length, 0);