Access value in arrays of structs spark scala

Question

Hi, I have a dataset with the below sample data with structure stored in a case class 

case class CustomerDocument(
                             customerId: String,
                             forename: String,
                             surname: String,
                             //Accounts for this customer
                             accounts: Seq[AccountData],
                             //Addresses for this customer
                             address: Seq[AddressData]
                           )

|customerId|forename   |surname|accounts |address   |                                                                                                                         |IND0001   |Christopher|Black  |[]|[[ADR360,IND0001,762, East 14th Street, New York, United States of America,762, East 14th Street, New York, United States of America]]|

schema as 

root
 |-- customerId: string (nullable = true)
 |-- forename: string (nullable = true)
 |-- surname: string (nullable = true)
 |-- accounts: array (nullable = true)
 |    |-- element: struct (containsNull = true)
 |    |    |-- customerId: string (nullable = true)
 |    |    |-- accountId: string (nullable = true)
 |    |    |-- balance: long (nullable = true)
 |-- address: array (nullable = true)
 |    |-- element: struct (containsNull = true)
 |    |    |-- addressId: string (nullable = true)
 |    |    |-- customerId: string (nullable = true)
 |    |    |-- address: string (nullable = true)
 |    |    |-- number: integer (nullable = true)
 |    |    |-- road: string (nullable = true)
 |    |    |-- city: string (nullable = true)
 |    |    |-- country: string (nullable = true)

I need to access the "country" value from array of struct and check for a particular country value (for eg. canada) and create a new column "isPresent" set as True if Canada is present and False if Canada is not present. 

I am not sure how to get the index of the array struct from above data. Any help / guidance how to do this is appreciated. Thanks