# encoding: utf-8
#
# This file is part of the lazier gem. Copyright (C) 2013 and above Shogun <shogun_panda@me.com>.
# Licensed under the MIT license, which can be found at http://www.opensource.org/licenses/mit-license.php.
#

module Lazier
  # Settings for the extensions.
  #
  # @attribute [r] format_number
  #   @return [Hash] Settings for numbers formatting.
  # @attribute [r] boolean_names
  #   @return [Hash] String representations of booleans.
  # @attribute [r] date_names
  #   @return [Hash] String representations of days and months.
  # @attribute [r] date_formats
  #   @return [Hash] Custom date and time formats.
  # @attribute [r] i18n
  #   @return [R18n::Translation] The translation object.
  class Settings
    attr_reader :format_number
    attr_reader :boolean_names
    attr_reader :date_names
    attr_reader :date_formats

    include Lazier::I18n

    # Returns the singleton instance of the settings.
    #
    # @param force [Boolean] If to force recreation of the instance.
    # @return [Settings] The singleton instance of the settings.
    def self.instance(force = false)
      @instance = nil if force
      @instance ||= ::Lazier::Settings.new
    end

    # Initializes a new settings object.
    def initialize
      i18n_setup(:lazier, ::File.absolute_path(::Pathname.new(::File.dirname(__FILE__)).to_s + "/../../locales/"))
      setup
    end

    # Setups the current instance.
    def setup
      setup_format_number
      setup_boolean_names
      setup_date_formats
      setup_date_names
    end

    # Set the current locale for messages.
    #
    # @param locale [String] The new locale. Default is the current system locale.
    # @return [R18n::Translation] The new translation object.
    def i18n=(locale)
      super(locale)
      setup
    end

    # Setups formatters for a number.
    # @see Object#format_number
    #
    # @param precision [Fixnum] The precision to show.
    # @param decimal_separator [String] The string to use as decimal separator.
    # @param add_string [String] The string to append to the number.
    # @param k_separator [String] The string to use as thousands separator.
    # @return [Hash] The new formatters.
    def setup_format_number(precision = 2, decimal_separator = ".", add_string = nil, k_separator = ",")
      @format_number = ::HashWithIndifferentAccess.new({precision: precision, decimal_separator: decimal_separator, add_string: add_string, k_separator: k_separator})
    end

    # Setups strings representation of booleans.
    # @see Object#format_boolean
    #
    # @param true_name [String] The string representation of `true`. Defaults to `Yes`.
    # @param false_name [String] The string representation of `false`. Defaults to `No`.
    # @return [Hash] The new representations.
    def setup_boolean_names(true_name = nil, false_name = nil)
      @boolean_names = {true => true_name || i18n.boolean[0], false => false_name || i18n.boolean[1]}
    end

    # Setups custom formats for dates and times.
    # @see DateTime#lstrftime
    #
    # @param formats [Hash] The format to add or replace.
    # @param replace [Boolean] If to discard current formats.
    # @return [Hash] The new formats.
    def setup_date_formats(formats = nil, replace = false)
      @date_formats = HashWithIndifferentAccess.new if replace || !@date_formats

      @date_formats.merge!(formats.ensure_hash({ct_date: "%Y-%m-%d", ct_time: "%H:%M:%S", ct_date_time: "%F %T", ct_iso_8601: "%FT%T%z" }))
      ::Time::DATE_FORMATS.merge!(@date_formats)

      @date_formats
    end

    # Setups strings representation of days and months.
    # @see DateTime::ClassMethods#days
    # @see DateTime::ClassMethods#months
    # @see DateTime#lstrftime
    #
    # @param long_months [Array] The string representation of months.
    # @param short_months [Array] The abbreviated string representation of months.
    # @param long_days [Array] The string representation of days.
    # @param short_days [Array] The abbreviated string representation of days.
    # @return [Hash] The new representations.
    def setup_date_names(long_months = nil, short_months = nil, long_days = nil, short_days = nil)
      definitions = self.i18n.date

      @date_names = {
        long_months: long_months.ensure(definitions.long_months),
        short_months: short_months.ensure(definitions.short_months),
        long_days: long_days.ensure(definitions.long_days),
        short_days: short_days.ensure(definitions.short_days)
      }.with_indifferent_access
    end
  end
end