#
# unique.rb
#

module Puppet::Parser::Functions
  newfunction(:unique, :type => :rvalue, :doc => <<-EOS
This function will remove duplicates from strings and arrays.

*Examples:*

    unique("aabbcc")

Will return:

    abc

You can also use this with arrays:

    unique(["a","a","b","b","c","c"])

This returns:

    ["a","b","c"]
    EOS
  ) do |arguments|

    if Puppet::Util::Package.versioncmp(Puppet.version, '5.0.0') >= 0
      function_deprecation([:unique, 'This method is deprecated, please use the core puppet unique function. There is further documentation for the function in the release notes of Puppet 5.0.'])
    end

    raise(Puppet::ParseError, "unique(): Wrong number of arguments given (#{arguments.size} for 1)") if arguments.size < 1

    value = arguments[0]

    unless value.is_a?(Array) || value.is_a?(String)
      raise(Puppet::ParseError, 'unique(): Requires either array or string to work with')
    end

    result = value.clone

    string = value.is_a?(String) ? true : false

    # We turn any string value into an array to be able to shuffle ...
    result = string ? result.split('') : result
    result = result.uniq # Remove duplicates ...
    result = string ? result.join : result

    return result
  end
end

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