class FoodsoftConfig
  mattr_accessor :scope, :config
  APP_CONFIG_FILE = ENV['FOODSOFT_APP_CONFIG'] || 'config/app_config.yml'
  # Rails.logger isn't ready yet - and we don't want to litter rspec invocation with this msg
  puts "-> Loading app configuration from #{APP_CONFIG_FILE}" unless defined? RSpec
  APP_CONFIG = YAML.load(File.read(File.expand_path(APP_CONFIG_FILE, Rails.root)))

  class << self

    def init
      # Load initial config from development or production
      set_config Rails.env
      # Overwrite scope to have a better namescope than 'production'
      self.scope = config[:default_scope] or raise "No default_scope is set"
      # Set defaults for backward-compatibility
      set_missing
    end

    # Set config and database connection for specific foodcoop
    # Only needed in multi coop mode
    def select_foodcoop(foodcoop)
      set_config foodcoop
      setup_database
    end

    # Provides a nice accessor for config values
    # FoodsoftConfig[:name] # => 'FC Test'
    def [](key)
      config[key]
    end

    # Loop through each foodcoop and executes the given block after setup config and database
    def each_coop
      if config[:multi_coop_install]
        APP_CONFIG.keys.reject { |coop| coop =~ /^(default|development|test|production)$/ }.each do |coop|
          select_foodcoop coop
          yield coop
        end
      else
        yield config[:default_scope]
      end
    end

    private

    def set_config(foodcoop)
      raise "No config for this environment (#{foodcoop}) available!" if APP_CONFIG[foodcoop].nil?
      self.config = APP_CONFIG[foodcoop].symbolize_keys
      self.scope = foodcoop
      set_missing
    end

    def setup_database
      database_config = ActiveRecord::Base.configurations[Rails.env]
      database_config = database_config.merge(config[:database]) if config[:database].present?
      ActiveRecord::Base.establish_connection(database_config)
    end

    # When new options are introduced, put backward-compatible defaults here, so that
    # configuration files that haven't been updated, still work as they did.
    def set_missing
      config.replace({
        use_nick: true,
        use_apple_points: true,
        foodsoft_url: 'https://github.com/foodcoops/foodsoft'
      }.merge(config))
    end

    # reload original configuration file, e.g. in between tests
    def reload!(filename = APP_CONFIG_FILE)
      APP_CONFIG.clear.merge! YAML.load(File.read(File.expand_path(filename, Rails.root)))
      init
    end

  end
end