require "spreadsheet/datatypes"
require "spreadsheet/encodings"

module Spreadsheet
  ##
  # Font formatting data
  class Font
    include Spreadsheet::Datatypes
    include Spreadsheet::Encodings

    attr_accessor :name
    ##
    # You can set the following boolean Font attributes
    # * #italic
    # * #strikeout
    # * #outline
    # * #shadow
    boolean :italic, :strikeout, :outline, :shadow
    ##
    # Font color
    colors :color
    ##
    # Font weight
    # Valid values: :normal, :bold or any positive Integer.
    # In Excel:
    #  100 <= weight <= 1000
    #  :bold   => 700
    #  :normal => 400
    # Default:      :normal
    enum :weight, :normal, :bold, Integer, bold: :b
    ##
    # Escapement
    # Valid values: :normal, :superscript or :subscript.
    # Default:      :normal
    enum :escapement, :normal, :superscript, :subscript,
      subscript: :sub,
      superscript: :super
    # Font size
    # Valid values: Any positive Integer.
    # Default:      10
    enum :size, 10, Numeric
    # Underline type
    # Valid values: :none, :single, :double, :single_accounting and
    #               :double_accounting.
    # Default:      :none
    enum :underline, :none, :single, :double,
      :single_accounting, :double_accounting,
      single: true
    # Font Family
    # Valid values: :none, :roman, :swiss, :modern, :script, :decorative
    # Default:      :none
    enum :family, :none, :roman, :swiss, :modern, :script, :decorative
    # Font Family
    # Valid values: :default, :iso_latin1, :symbol, :apple_roman, :shift_jis,
    #               :korean_hangul, :korean_johab, :chinese_simplified,
    #               :chinese_traditional, :greek, :turkish, :vietnamese,
    #               :hebrew, :arabic, :cyrillic, :thai, :iso_latin2, :oem_latin1
    # Default:      :default
    enum :encoding, :default, :iso_latin1, :symbol, :apple_roman, :shift_jis,
      :korean_hangul, :korean_johab, :chinese_simplified,
      :chinese_traditional, :greek, :turkish, :vietnamese,
      :hebrew, :arabic, :baltic, :cyrillic, :thai, :iso_latin2,
      :oem_latin1
    def initialize name, opts = {}
      self.name = name
      @color = :text
      @previous_fast_key = nil
      @size = nil
      @weight = nil
      @italic = nil
      @strikeout = nil
      @outline = nil
      @shadow = nil
      @escapement = nil
      @underline = nil
      @family = nil
      @encoding = nil
      opts.each do |key, val|
        send :"#{key}=", val
      end
    end

    ##
    # Sets #weight to :bold if(_bool_), :normal otherwise.
    def bold= bool
      self.weight = bool ? :bold : nil
    end

    def key # :nodoc:
      fk = fast_key
      return @key if @previous_fast_key == fk
      @previous_fast_key = fk
      @key = build_key
    end

    private

    def build_key # :nodoc:
      underscore = client("_", "UTF-8")
      key = []
      key << @name
      key << underscore << client(size.to_s, "US-ASCII")
      key << underscore << client(weight.to_s, "US-ASCII")
      key << client("_italic", "UTF-8") if italic?
      key << client("_strikeout", "UTF-8") if strikeout?
      key << client("_outline", "UTF-8") if outline?
      key << client("_shadow", "UTF-8") if shadow?
      key << underscore << client(escapement.to_s, "US-ASCII")
      key << underscore << client(underline.to_s, "US-ASCII")
      key << underscore << client(color.to_s, "US-ASCII")
      key << underscore << client(family.to_s, "US-ASCII")
      key << underscore << client(encoding.to_s, "US-ASCII")
      key.join("")
    end

    def fast_key
      [@name, @size, @weight, @italic, @strikeout, @outline, @shadow, @escapement, @underline, @color, @family, @encoding]
    end
  end
end
