// Contains helper for checking format version of unique indexes.

/**
 * Verifies that all unique indexes belonging to all collections on all databases on the server
 * are in correct data format version.
 */
export function checkUniqueIndexFormatVersion(adminDB) {
    // Data format version is WiredTiger specific and not required to be tested for other
    // storage engines.
    const isWiredTiger = assert.commandWorked(adminDB.serverStatus()).storageEngine.name === "wiredTiger";
    if (!isWiredTiger) return;

    let res = assert.commandWorked(adminDB.runCommand({"listDatabases": 1}));
    let databaseList = res.databases;

    databaseList.forEach(function (database) {
        let currentDatabase = adminDB.getSiblingDB(database.name);
        // Get the list of collections including collections that are pending drop. This is to
        // ensure that every unique index has the correct format version.
        let collections = currentDatabase.runCommand("listCollections").cursor.firstBatch;
        collections.forEach(function (c) {
            if (c.type == "view") {
                return;
            }

            let currentCollection = currentDatabase.getCollection(c.name);
            currentCollection.getIndexes().forEach(function (index) {
                if (index.unique && !index.clustered) {
                    let ifv = currentCollection.aggregate({$collStats: {storageStats: {}}}).next().storageStats
                        .indexDetails[index.name].metadata.formatVersion;
                    if (index.v === 2) {
                        assert(
                            ifv == 12 || ifv == 14,
                            "Expected index format version 12 or 14 for unique index: " + tojson(index),
                        );
                    } else {
                        assert(
                            ifv == 11 || ifv == 13,
                            "Expected index format version 11 or 13 for unique index: " + tojson(index),
                        );
                    }
                }
            });
        });
    });
}