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package org.rogach.scallop.exceptions

import org.rogach.scallop.Util

/** Parent trait for all not-positive results that can be resulted from this library (including help and exits) */
sealed trait ScallopResult

/** Thrown when user requested help output (via "--help"). */
case class Help(command: String) extends Exception with ScallopResult
/** Thrown when user requested version printout (via "--version"). */
case object Version extends Exception with ScallopResult
/** Extractor object, for matching on both Help and Version results. */
object Exit {
  def unapply(r: ScallopResult) = r match {
    case Help(_) => true
    case Version => true
    case _ => false
  }
}

/** Parent class for all exceptions thrown from this library. */
abstract class ScallopException(val message: String) extends Exception(message) with ScallopResult
/** Extractor object, for matching on all exceptions. */
object ScallopException {
  def unapply(e: ScallopException): Option[String] = {
    Some(e.message)
  }
}

/** Thrown when option name guessing fails on one of the options. */
case class OptionNameGuessingFailure()
  extends ScallopException("Failed to guess option name for one of the options")
/** Thrown when option name guessing is not available on the platform (currently JS and Native). */
case class OptionNameGuessingUnsupported()
  extends ScallopException("Option name guessing is unsupported, please provide option name explicitly. More info: https://github.com/scallop/scallop/wiki/Native-and-JS")
/** Wrapper exception for cases when internal reflective mechanics fail */
case class OptionNameGuessingException(cause: Exception)
    extends ScallopException("Option name guessing experienced internal failure (more information can be found in the .cause of this exception)") {
  this.initCause(cause)
}

/** Thrown when user provides excess arguments that can't be matched by trailing arg options. */
case class ExcessArguments(args: Seq[String])
  extends ScallopException(Util.format("Excess arguments provided: '%s'", args.mkString(" ")))

/** Thrown when several options and/or trailing arguments have identical names
    in definition - making it impossible to distinguish between them. */
case class IdenticalOptionNames(mess:String) extends ScallopException(mess)

/** Thrown when user provides Scallop with unknown option name in the arguments
    or requests unknown option result from parser. */
case class UnknownOption(optionName: String)
  extends ScallopException(Util.format("Unknown option '%s'", optionName))

/** Thrown when arguments to some option do not satisfy that option's
    value converter (it returns Left in such case). */
case class WrongOptionFormat(optionName: String, args: String, msg: String)
  extends ScallopException(Util.format("Bad arguments for option '%s': '%s' - %s", optionName, args, msg))

/** Thrown when parser failed to find arguments to option (marked as 'required')
    in the input arguments. */
case class RequiredOptionNotFound(name: String)
  extends ScallopException(Util.format("Required option '%s' not found", name))

/** Thrown when user tried to extract the value of an option before the call
    to verify in ScallopConf. */
case class IncompleteBuildException()
  extends ScallopException("It seems you tried to get option value before you constructed all options (maybe you forgot to call .verify method?). Please, move all extraction of values to after 'verify' method in ScallopConf.")

/** Thrown when user tried to create an option with some illegal parameters - for example, with digit as the first character in opton name. */
case class IllegalOptionParameters(mess: String) extends ScallopException(mess)

/** Thrown when the validation failed on some option. */
case class ValidationFailure(mess: String) extends ScallopException(mess)

/** Thrown when option reader failed to read options from stdin or file. */
case class OptionReaderFailure(mess: String) extends ScallopException(mess)

/** This is a special case of exception - the one you should never see.
    If you actually saw it, there is a sure bug lurking somewhere. In such cases, please
    file a bug on project page! */
case class MajorInternalException() extends ScallopException("Oi, something went awfully wrong. Please report a bug to the developer of the library!")

/** Exception class for cases which didn't fit into other exception classes. */
case class GenericScallopException(msg: String) extends ScallopException(msg)