# frozen_string_literal: true

require 'semverify/version_file_sources'

module Semverify
  # Finds the file that contains the gem's version and returns a VersionFile instance
  #
  # @api public
  #
  class VersionFileFactory
    # The list of VersionFileSources to check for the version file
    #
    # The order of the list is important. The first VersionFileSource that finds a version file will be used.
    #
    VERSION_FILE_SOURCES = [
      Semverify::VersionFileSources::Version,
      Semverify::VersionFileSources::VersionRb,
      Semverify::VersionFileSources::Gemspec
    ].freeze

    # Finds the version file for the gem
    #
    # @example
    #   version_file = Semverify::VersionFileFactory.find
    #   version_file.path # => 'lib/semverify/version.rb'
    #   version_file.version # => '1.2.3'
    #
    # @return [Semverify::VersionFile, nil] the version file or nil if no version file was found
    #
    def self.find
      VERSION_FILE_SOURCES.each do |version_file_source|
        version_file = version_file_source.find
        return version_file if version_file
      end
      nil
    end
  end
end