import ArgumentParser
import CliClient
import Logging
import Models
import MQTTNIO

extension Application {

  struct SharedOptions: ParsableArguments {
    @Option(
      name: [.short, .customLong("env-file")],
      help: "A file path to an env file."
    )
    var envFile: String?

    @Option(
      name: [.short, .customLong("log-level")],
      help: "Set the logging level."
    )
    var logLevel: LogLevelContainer?

    @Option(
      name: [.short, .long],
      help: "Set the MQTT connecition version."
    )
    var version: String?

    func envVarsRequest(logger: Logger?) -> CliClient.EnvVarsRequest {
      .init(envFilePath: envFile, logger: logger, version: version)
    }

  }
}

/// A container type for making `Logger.Level` into a type
/// that can be parsed as a command line argument.  This is
/// to suppress warnings vs. having `Logger.Level` adopt the
/// protocol.
@_spi(Internal)
public struct LogLevelContainer: ExpressibleByArgument {
  public let logLevel: Logger.Level?

  public init?(argument: String) {
    self.logLevel = .init(rawValue: argument.lowercased())
  }

  public func callAsFunction() -> Logger.Level? {
    logLevel
  }
}