import Foundation

class InputsValidationService {

    // No special characters (e.g. @,#,$,%,&,*,(,),^,<,>,!,±)
    // Only letters, underscores and numbers allowed
    // Length should be 18 characters max and 3 characters minimum
    static func isValid(username:String) -> Bool {
        let regEx = "\\A\\w{3,18}\\z"
        let pred = NSPredicate(format:"SELF MATCHES %@", regEx)
        return pred.evaluate(with:username)
    }

    // There’s some text before the @
    // There’s some text after the @
    // There’s at least 2 alpha characters after a .
    static func isValid(email:String?) -> Bool {
        guard email != nil else { return false }
        let regEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
        let pred = NSPredicate(format:"SELF MATCHES %@", regEx)

        return pred.evaluate(with: email)
    }

    // at least one uppercase,
    // at least one digit
    // at least one lowercase
    // 6 characters total
    static func isValid(password:String?) -> Bool {
        guard password != nil else { return false }
        let pred = NSPredicate(format: "SELF MATCHES %@", "(?=.*[A-Z])(?=.*[0-9])(?=.*[a-z]).{6,}")
        return pred.evaluate(with: password)
    }
}