require 'date'

module Pact
  module Generator
    # Date provides the time generator which will give the current date in the defined format
    class Date
      def can_generate?(hash)
        hash.key?('type') && hash['type'] == type
      end

      def call(hash, _params = nil, _example_value = nil)
        format = hash['format'] || default_format
        ::Time.now.strftime(convert_from_java_simple_date_format(format))
      end

      def type
        'Date'
      end

      def default_format
        'yyyy-MM-dd'
      end

      # Format for the pact specficiation should be the Java DateTimeFormmater
      # This tries to convert to something Ruby can format.
      def convert_from_java_simple_date_format(format)
        # Year
        format.sub!(/(?<!%)y{4,}/, '%Y')
        format.sub!(/(?<!%)y{1,}/, '%y')

        # Month
        format.sub!(/(?<!%)M{4,}/, '%B')
        format.sub!(/(?<!%)M{3}/, '%b')
        format.sub!(/(?<!%)M{1,2}/, '%m')

        # Week
        format.sub!(/(?<!%)M{1,}/, '%W')

        # Day
        format.sub!(/(?<!%)D{1,}/, '%j')
        format.sub!(/(?<!%)d{1,}/, '%d')
        format.sub!(/(?<!%)E{4,}/, '%A')
        format.sub!(/(?<!%)D{1,}/, '%a')
        format.sub!(/(?<!%)u{1,}/, '%u')

        # Time
        format.sub!(/(?<!%)a{1,}/, '%p')
        format.sub!(/(?<!%)k{1,}/, '%H')
        format.sub!(/(?<!%)n{1,}/, '%M')
        format.sub!(/(?<!%)s{1,}/, '%S')
        format.sub!(/(?<!%)S{1,}/, '%L')

        # Timezone
        format.sub!(/(?<!%)z{1,}/, '%z')
        format.sub!(/(?<!%)Z{1,}/, '%z')
        format.sub!(/(?<!%)X{1,}/, '%Z')

        format
      end
    end
  end
end