module Rubicure
  class Girl
    attr_reader :human_name, :precure_name, :transform_message, :extra_names, :current_state, :state_names

    @@cache = {}
    @@config = nil

    def initialize(human_name: nil, precure_name: nil, transform_message: nil, extra_names: [])
      @human_name        = human_name
      @precure_name      = precure_name
      @transform_message = transform_message
      @extra_names       = extra_names || []
      @current_state     = 0
      @state_names = [@human_name, @precure_name]
      @state_names += @extra_names unless @extra_names.empty?
    end

    # @return [String] name of current form
    def name
      @state_names[@current_state]
    end

    # human -> precure ( -> extra forms ) -> human ...
    # @return [Rubicure::Girl] self
    def transform!
      @current_state += 1
      @current_state = 0 unless @current_state < @state_names.length

      puts @transform_message  if @current_state == 1

      self
    end

    def humanize
      @current_state = 0
    end

    # @param girl_name [Symbol]
    # @return [Rubicure::Girl]
    def self.find(girl_name)
      raise "unknown girl: #{girl_name}" unless valid?(girl_name)

      unless @@cache[girl_name]
        girl_config = config[girl_name] || {}
        @@cache[girl_name] = Rubicure::Girl.new(girl_config)
      end

      @@cache[girl_name]
    end

    # @return [Array<Symbol>]
    def self.names
      config.keys
    end

    # @return [Array<Symbol>]
    def self.uniq_names
      uniq_names = []
      config.each do |name, series|
        uniq_names << name unless uniq_names.any?{|uniq_name| config[uniq_name][:precure_name] == series[:precure_name] }
      end
      uniq_names
    end

    # @return [Hash] content of config/girls.yml
    def self.config
      unless @@config
        config_file = "#{File.dirname(__FILE__)}/../../config/girls.yml"
        @@config = YAML.load_file(config_file).deep_symbolize_keys
      end
      @@config
    end

    # @return [Hash] content of config/precure.yml
    def self.reload_config!
      @@cache = {}
      @@config = nil
      config
    end

    # @param [Symbol] girl_name
    def self.valid?(girl_name)
      names.include?(girl_name)
    end
  end
end