module StylePalette

# File lib/style_palette.rb, line 10
def self.brush(word, palette_name)
  word = word.to_s
  palette_name = palette_name.to_sym

  raise ArgumentError, "Palette not found '#{palette_name}'" unless palettes[palette_name]
  brush_by_regex(word, palette_name) || brush_by_range(word, palette_name) || brush_by_index(word, palette_name)
end

# File lib/style_palette.rb, line 36
def self.brush_by_index(word, palette_name)
  index = word.each_byte.inject( &:+ )
  palettes[palette_name][ index % palettes[palette_name].length ]
end

# File lib/style_palette.rb, line 22
def self.brush_by_range(word, palette_name)
  palettes[palette_name].select do |e|
    result = false

    if e.range
      from = e.range.split("..")[0].length > 0 ? e.range.split("..")[0].to_i : -Float::INFINITY
      to = e.range.split("..")[1] ? e.range.split("..")[1].to_i : Float::INFINITY
      result = (from..to).include?(word.to_i)
    end

    result
  end.to_a.first
end

# File lib/style_palette.rb, line 18
def self.brush_by_regex(word, palette_name)
  palettes[palette_name].select{ |e| e.regex && word =~ /#{e.regex}/  }.first
end

# File lib/style_palette.rb, line 67
def self.palettes
  @palettes || raise(Exception, "Palettes not initialized, try `StylePalette.palettes_config = <file_path>`")
end

# File lib/style_palette.rb, line 46
def self.palettes_config
  @palettes_config
end

# File lib/style_palette.rb, line 41
def self.palettes_config=(style_palettes_file_path)
  style_palettes_json = File.read(style_palettes_file_path)
  palettes_config_json style_palettes_json
end

# File lib/style_palette.rb, line 50
def self.palettes_config_json(style_palettes_json)
  @palettes_config = style_palettes_json

  palettes = {}

  JSON.parse(style_palettes_json).each do |palette_name, palette|
    palettes[palette_name.to_sym] = palette.map { |e| OpenStruct.new(e) }
  end

  @palettes = palettes
end

# File lib/style_palette.rb, line 62
def self.reset
  @palettes = nil
  @palettes_config = nil
end