//
// Tests that only a correct major-version is needed to connect to a shard via mongos
//
// @tags: [
//   # TODO (SERVER-88123): Re-enable this test.
//   # Test doesn't start enough mongods to have num_mongos routers
//   embedded_router_incompatible,
// ]
import {ShardingTest} from "jstests/libs/shardingtest.js";

var st = new ShardingTest({shards: 1, mongos: 2});

var mongos = st.s0;
var staleMongos = st.s1;
var admin = mongos.getDB("admin");
var config = mongos.getDB("config");
var coll = mongos.getCollection("foo.bar");

// Shard collection
assert.commandWorked(admin.runCommand({enableSharding: coll.getDB() + ""}));
assert.commandWorked(admin.runCommand({shardCollection: coll + "", key: {_id: 1}}));

// Make sure our stale mongos is up-to-date with no splits
staleMongos.getCollection(coll + "").findOne();

// Run one split
assert.commandWorked(admin.runCommand({split: coll + "", middle: {_id: 0}}));

// Make sure our stale mongos is not up-to-date with the split
printjson(admin.runCommand({getShardVersion: coll + ""}));
printjson(staleMongos.getDB("admin").runCommand({getShardVersion: coll + ""}));

// Compare strings b/c timestamp comparison is a bit weird
assert.eq(Timestamp(1, 0),
          staleMongos.getDB("admin").runCommand({getShardVersion: coll + ""}).version);

// See if our stale mongos is required to catch up to run a findOne on an existing connection
staleMongos.getCollection(coll + "").findOne();

printjson(staleMongos.getDB("admin").runCommand({getShardVersion: coll + ""}));

assert.eq(Timestamp(1, 0),
          staleMongos.getDB("admin").runCommand({getShardVersion: coll + ""}).version);

// See if our stale mongos is required to catch up to run a findOne on a new connection
staleMongos = new Mongo(staleMongos.host);
staleMongos.getCollection(coll + "").findOne();

printjson(staleMongos.getDB("admin").runCommand({getShardVersion: coll + ""}));

assert.eq(Timestamp(1, 0),
          staleMongos.getDB("admin").runCommand({getShardVersion: coll + ""}).version);

st.stop();
