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import Foundation
/**
 The Azure Communication Services User token credential.
 */
internal class StaticTokenCredential: CommunicationTokenCredentialProviding {
    private let accessToken: CommunicationAccessToken

    /**
     Creates a static `CommunicationTokenCredential` object from the provided token.

     - Parameter token: The static token to use for authenticating all requests.

     - Throws: `NSError` if the provided token is not a valid token. `userInfo` contains `message` key for reason.

     - SeeAlso: ` CommunicationTokenCredential.init(...)`
     */
    public init(token: String) throws {
        self.accessToken = try JwtTokenParser.createAccessToken(token)
    }

    /**
     Retrieve an access token from the credential.

     - Parameter completionHandler: Closure that accepts an optional `AccessToken` or optional `Error` as parameters. `AccessToken` returns a token and an expiry date if applicable.
     `Error` returns `nil` if the current token can be returned.
     */
    public func token(completionHandler: CommunicationTokenCompletionHandler) {
        completionHandler(accessToken, nil)
    }

    /**
     Intentionally empty as it does not have any internal auto-refresh operation.
     */
    public func cancel() {}
}
