module Buildgem
  class Version
    include ForwardGemMethodsToConfig

    class << self
      attr_accessor :args

      def increment!(options = [])
        @args = options.empty? ? %w(patch) : options

        instance.increment!
      end

      def instance
        version_class.new
      end

      def version_class
        eval "Buildgem::#{version_type.capitalize}Version"
      end

      def version_type
        args[0]
      end

      def method_missing(method_name, *args)
        instance.send(method_name, *args)
      end
    end

    attr_accessor :file_content

    def initialize
      @file_content = File.read(gem_version_full_file_path)
    end

    def increment!
      content = file_content.gsub(current_version, new_version)

      File.open(gem_version_full_file_path, 'w') do |f|
        f.write(content)
      end
    end

    def current_version
      file_content.match(/VERSION = (".+")/) { |m| m[1] }
    end

    def new_version
      raise "Please implement #{self.name}#new_version"
    end
  end
end

require 'buildgem/version/major_version'
require 'buildgem/version/minor_version'
require 'buildgem/version/patch_version'