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// SERVER-4589: Add $arrayElemAt aggregation expression.
// For assertErrorCode.
load('jstests/aggregation/extras/utils.js');
(function() {
'use strict';
var coll = db.agg_array_elem_at_expr;
coll.drop();
assert.writeOK(coll.insert({a: [1, 2, 3, 4, 5]}));
// Normal indexing.
var pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', 2]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{x: 3}]);
// Indexing with a float.
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', 1.0]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{x: 2}]);
// Negative indexing.
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', -1]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{x: 5}]);
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', -5]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{x: 1}]);
// Out of bounds positive.
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', 5]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{}]);
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', Math.pow(2, 31) - 1]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{}]);
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', NumberLong(Math.pow(2, 31) - 1)]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{}]);
// Out of bounds negative.
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', -6]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{}]);
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', -Math.pow(2, 31)]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{}]);
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', NumberLong(-Math.pow(2, 31))]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{}]);
// Null inputs.
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: ['$a', null]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{x: null}]);
pipeline = [{$project: {_id: 0, x: {$arrayElemAt: [null, 4]}}}];
assert.eq(coll.aggregate(pipeline).toArray(), [{x: null}]);
// Error cases.
// Wrong number of arguments.
assertErrorCode(coll, [{$project: {x: {$arrayElemAt: [['one', 'arg']]}}}], 16020);
// First argument is not an array.
assertErrorCode(coll, [{$project: {x: {$arrayElemAt: ['one', 2]}}}], 28689);
// Second argument is not numeric.
assertErrorCode(coll, [{$project: {x: {$arrayElemAt: [[1, 2], '2']}}}], 28690);
// Second argument is not integral.
assertErrorCode(coll, [{$project: {x: {$arrayElemAt: [[1, 2], 1.5]}}}], 28691);
assertErrorCode(coll, [{$project: {x: {$arrayElemAt: [[1, 2], Math.pow(2, 32)]}}}], 28691);
assertErrorCode(coll, [{$project: {x: {$arrayElemAt: [[1, 2], -Math.pow(2, 31) - 1]}}}], 28691);
}());
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