require 'tifffile/version'
require "tifffile/tifffile"
require "tags"

class TiffFile

  include TiffFileVersion
  include TiffFileTags


  alias :valid? :is_valid?
  alias :is_big_endian? :big_endian?
  alias :sample_format :sample_format?

  alias :unset_field :remove_field

  alias :set :write_matrix
  alias :get :read_matrix

  alias :flush! :save
  alias :save! :save

  # Get field value
  def get_field(fname)
    field = tag fname
    return nil if field.nil?

    value = case field.type
              when :string
                get_string_field field.id
              when :ushort
                get_int_field field.id, 2
              when :uint
                get_int_field field.id, 4
              when :double
                get_float_field field.id, true
              when :float
                get_float_field field.id, true
              else
                nil
            end

    return value if field.map.nil?
    field.map.has_value?(value) ? field.map.key(value).to_sym : nil
  end

  # Set field value
  def set_field(fname, fvalue)
    field = tag fname
    return nil if field.nil?

    symkey = fname.to_s.to_sym
    value = (field.map.nil? or not field.map.has_key?(symkey)) ? fvalue : field.map[symkey]

    case field.type
      when :string
        set_string_field field.id, value.to_s
      when :ushort
        set_int_field field.id, value.to_i, 2
      when :uint
        set_int_field field.id, value.to_i, 4
      when :double
        set_float_field field.id, value.to_i, true
      when :float
        set_float_field field.id, value.to_i, true
      else
        nil
    end

  end



end