(function() {
'use strict';

const collNamePrefix = 'insert1_';
let collCount = 0;

// _id field of inserted document should be generated if omitted.
let t = db.getCollection(collNamePrefix + collCount++);
t.drop();
let o = {a: 1};
assert.commandWorked(t.insert(o));
let doc = t.findOne();
assert.eq(1, doc.a);
assert(doc._id != null, tojson(doc));

// Confirm that default-constructed ObjectId in collection matches that in the insert request.
// Also, see OID definition in mongo/bson/oid.h.
t = db.getCollection(collNamePrefix + collCount++);
t.drop();
o = {
    a: 2,
    _id: new ObjectId()
};
let id = o._id;
assert.commandWorked(t.insert(o));
doc = t.findOne();
assert.eq(2, doc.a);
assert.eq(id, doc._id);

// Tests non-ObjectId type for _id field.
t = db.getCollection(collNamePrefix + collCount++);
t.drop();
o = {
    a: 3,
    _id: "asdf"
};
id = o._id;
assert.commandWorked(t.insert(o));
doc = t.findOne();
assert.eq(3, doc.a);
assert.eq(id, doc._id);

// Tests that the null value is acceptable for the _id field.
t = db.getCollection(collNamePrefix + collCount++);
t.drop();
o = {
    a: 4,
    _id: null
};
assert.commandWorked(t.insert(o));
doc = t.findOne();
assert.eq(4, doc.a);
assert.eq(null, doc._id, tojson(doc));

// Tests that failing to insert an invalid document with a regex for the _id field will not result
// in the collection being created.
// Previously in insert2.js (tagged with assumes_no_implicit_collection_creation_after_drop).
t = db.getCollection(collNamePrefix + collCount++);
t.drop();
if (t.exists()) {
    // Some passthroughs, sharded test fixtures for example, may override DB.getCollection() or
    // DB.drop() to create and shard the collection.
    jsTestLog('Collection implicitly created after DB.getCollection(): ' + t.getFullName() +
              ' Skipping regex _id test.');
} else {
    assert.commandFailed(t.insert({_id: /x/}));
    assert.isnull(t.exists());
}

// Tests that _id field can be a number and handling of bulk write results over
// multiple batches in the legacy shell. See SERVER-12763.
// This test contains a large number of inserts which will get grouped together by the
// passthrough and create a very slow transaction in slow variants.
// See SERVER-53447 and operations_longer_than_stepdown_interval_in_txns tag.
t = db.getCollection(collNamePrefix + collCount++);
t.drop();
let toInsert = [];
// This needs to be larger than Bulk.maxNumberOfDocsInBatch defined in bulk_api.js.
const count = 2 * 1000;
for (let i = 0; i < count; ++i) {
    toInsert.push({_id: i, a: 5});
}
assert.commandWorked(t.insert(toInsert));
doc = t.findOne({_id: 1});
assert.eq(5, doc.a);
assert.eq(count, t.countDocuments({}), "bad count");
})();