module FlfCreator

# File lib/flf_creator.rb, line 4
def self.build_field(args = {})
  value = format_value(args[:value], args[:format])
  if value.length > args[:length].to_i
    value = value[0..args[:length].to_i-1]
  end
  padding_char = (args[:padding_char] || ' ').to_s
  padding_num = args[:length].to_i - value.length
  if args[:justify] == 'right'
    "#{padding_char * padding_num}#{value}"
  else
    "#{value}#{padding_char * padding_num}"
  end
end

# File lib/flf_creator.rb, line 42
def self.build_file(records)
  records.join("\n")
end

# File lib/flf_creator.rb, line 38
def self.build_record(fields)
  fields.join('')
end

# File lib/flf_creator.rb, line 18
def self.format_value(value, format)
  return value.to_s unless format and value
  case format
    when Proc
      format.call(value)
    when String
      if value.is_a?(DateTime)
        value.strftime(format)
      elsif value.is_a?(String) and value =~ /^\d{4}.\d{1,2}.\d{1,2}+?/
        DateTime.parse(value).strftime(format)
      elsif value.is_a?(String) and value =~ /^\d{1,2}.\d{1,2}.\d{4}+?/
        DateTime.parse(value).strftime(format)
      else
        format % value.to_i
      end
    else
      raise "Unknown format type: #{format.class}"
  end.to_s
end