# frozen_string_literal: true

require 'credit_gateway/errors'
require 'credit_gateway/camelizer_lower'

module CreditGateway
  class BaseModel
    class << self
      def attributes(*attributes)
        @attributes ||= []

        return @attributes unless attributes

        attr_accessor(*attributes)

        @attributes += attributes
      end

      def attribute_aliases(aliases = nil)
        @attribute_aliases ||= {}

        return @attribute_aliases unless aliases

        @attribute_aliases.merge!(aliases)
      end

      def key_transformer
        CamelizerLower
      end

      # Sets all the instance variables by reading the JSON from CreditGateway and converting the keys from
      # PascalCase to snake_case, as it's the standard in Ruby.
      def build(json: {}, key_transformer: self.key_transformer)
        new.tap do |record|
          attributes.each do |attr|
            key = attribute_aliases.key?(attr) ? attribute_aliases[attr] : attr
            record.public_send("#{attr}=", json[key_transformer.transform(key)])
          end
        end
      end
    end

    def initialize(attributes = {})
      attributes.each do |attr, value|
        public_send("#{attr}=", value)
      end
    end

    def as_json
      self.class.attributes.each_with_object({}) do |attr, hash|
        value = public_send(attr)

        value = value.as_json if value.respond_to?(:as_json)
        if value.is_a?(Array)
          value = value.map { |v| v.respond_to?(:as_json) ? v.as_json : v }
        end
        value = value.iso8601 if value.respond_to?(:iso8601)

        key = self.class.key_transformer.transform(attr)

        hash[key] = value
      end
    end
  end
end