class Byebug::CatchCommand

def self.description
  <<-EOD
    cat[ch][ (off|<exception>[ off])]
    #{short_description}
    catch                 -- lists catchpoints
    catch off             -- deletes all catchpoints
    catch <exception>     -- enables handling <exception>
    catch <exception> off -- disables handling <exception>
  EOD
end

def self.regexp
  /^\s* cat(?:ch)? (?:\s+(\S+))? (?:\s+(off))? \s*$/x
end

def self.short_description
  'Handles exception catchpoints'
end

def add(exception)
  if single_thread_eval("#{exception.is_a?(Class)}")
    errmsg pr('catch.errors.not_class', class: exception)
  end
  puts pr('catch.added', exception: exception)
  Byebug.add_catchpoint(exception)
end

def clear
  Byebug.catchpoints.clear if confirm(pr('catch.confirmations.delete_all'))
end

def execute
  return info unless @match[1]
  return 'off' == @match[1] ? clear : add(@match[1]) unless @match[2]
  return errmsg pr('catch.errors.off', off: cmd) unless @match[2] == 'off'
  remove(@match[1])
end

def info
  if Byebug.catchpoints && !Byebug.catchpoints.empty?
    Byebug.catchpoints.each do |exception, _hits|
      puts("#{exception}: #{exception.is_a?(Class)}")
    end
  else
    puts 'No exceptions set to be caught.'
  end
end

def remove(exception)
  unless Byebug.catchpoints.member?(exception)
    return errmsg pr('catch.errors.not_found', exception: exception)
  end
  puts pr('catch.removed', exception: exception)
  Byebug.catchpoints.delete(exception)
end