# frozen_string_literal: false

# Container class for configuration values.
class USPSFlags
  class Config
    BLUE ||= '#012169'.freeze
    RED ||= '#E4002B'.freeze
    GOLD ||= '#FFBF3F'.freeze
    OLD_GLORY_BLUE ||= '#041E42'.freeze
    OLD_GLORY_RED ||= '#BF0D3E'.freeze

    # Base measurements for most flags, before scaling
    BASE_FLY ||= 3072
    BASE_HOIST ||= BASE_FLY * 2 / 3
    FRACTION_SCALE ||= 85

    attr_accessor :flags_dir, :clear

    # Configuration constructor
    #
    # @param [String] flag_dir The path to the flags directory.
    # @param [Boolean] clear Whether to clear out the specified flags_dir.
    def initialize
      get_defaults
      yield self if block_given?
    end

    # Base configuration values for trident insignia.
    #
    # All other values are derived from these, or directly from the constant sizes.
    #
    # @return [Hash] RThe configuration values for tridents.
    def trident
      {
        height: trident_heights, center_point: BASE_FLY / 2,
        width: USPSFlags::Config::BASE_FLY * 5 / 32, bar_width: bar_width,
        hash_width: USPSFlags::Config::BASE_FLY * 47 / 528
      }.merge(spikes_config).merge(delta_config).merge(circle_config)
    end

    # Height values for trident insignia.
    #
    # @return [Hash] The height values for tridents.
    def trident_heights
      {
        s: USPSFlags::Config::BASE_HOIST / 2,
        d: USPSFlags::Config::BASE_HOIST * 5 / 8,
        stf: USPSFlags::Config::BASE_HOIST * 3 / 4,
        n: USPSFlags::Config::BASE_HOIST * 3 / 4
      }
    end

    # Alias for the directory to store generated log files.
    #
    # @return [String] The current path to the logs directory.
    def log_path
      if defined?(::Rails)
        "#{::Rails.root}/log"
      else
        "#{USPSFlags.configuration.flags_dir}/log"
      end
    end

  private

    def get_defaults
      @flags_dir = if defined?(::Rails)
        "#{::Rails.root}/app/assets/images/usps-flags"
      else
        "#{File.dirname(__dir__)}/output"
      end
      @use_larger_tridents = true
      @clear = false
    end

    def center_point_height
      USPSFlags::Config::BASE_FLY / 48 * 23 / 8
    end

    def side_point_height
      USPSFlags::Config::BASE_FLY / 48 * 21 / 8
    end

    def bar_width
      USPSFlags::Config::BASE_FLY / 48 * 5 / 4
    end

    def spikes_config
      {
        center_point_height: center_point_height, side_point_height: side_point_height,
        main_point_barb: USPSFlags::Config::BASE_HOIST / 82,
        crossbar_from_top: USPSFlags::Config::BASE_HOIST / 4 + bar_width / 5,
        side_spike_height: USPSFlags::Config::BASE_HOIST / 4 - side_point_height - bar_width * 3 / 5
      }
    end

    def delta_config
      {
        delta_height: USPSFlags::Config::BASE_FLY * 33 / 240, delta_gap_height: USPSFlags::Config::BASE_FLY / 16,
        delta_gap_width: bar_width * 5 / 4, delta_width: USPSFlags::Config::BASE_FLY * 43 / 768,
        delta_from_bottom: USPSFlags::Config::BASE_HOIST * 10 / 64, delta_gap_scale: 0.40,
        delta_gap_x: USPSFlags::Config::BASE_HOIST * 144 / 128, delta_gap_y: USPSFlags::Config::BASE_HOIST * 221 / 256
      }
    end

    def circle_config
      { circle_height_adj: USPSFlags::Config::BASE_FLY / 800 }
    end
  end
end