# encoding: utf-8
require 'fedux_org_stdlib/version_management/rubygem_version_file'
require 'fedux_org_stdlib/rake/task'
require 'fedux_org_stdlib/roles/versionable'

module FeduxOrgStdlib
  module Rake
    # Version Bump Task
    #
    # @example Create new version task for bumping the major number X.0.0
    #   FeduxOrgStdlib::Rake::VersionBumpTask.new(
    #     name: 'version:bump:major',
    #     description: 'Bump major version part'
    #   ) { |t| t.bump_version :major }
    #
    # @example Create new version task for bumping the minor number 0.X.0
    #   FeduxOrgStdlib::Rake::VersionBumpTask.new(
    #     name: 'version:bump:minor',
    #     description: 'Bump minor version part'
    #   ) { |t| t.bump_version :minor }
    #
    # @example Create new version task for bumping the tiny number 0.0.X
    #   FeduxOrgStdlib::Rake::VersionBumpTask.new(
    #     name: 'version:bump:tiny',
    #     description: 'Bump tiny version part'
    #   ) { |t| t.bump_version :tiny }
    #
    # @see Rakefile
    class VersionBumpTask < Task
      include Roles::Versionable

      # @private
      def bump_version(type)
        version_update do |file|
          file.bump(type)
        end
      end

      # @private
      def version(new_version)
        fail Exception, "You need to define a version via \"VERSION=<version>\" or \"version=<version>\"." if new_version.blank?

        begin
          version_update do |file|
            file.version = new_version
          end
        rescue StandardError => e
          logger.fatal("Nothing has changed since your last commit or has been added to the index. Therefor nothing needs to be commited: #{e.message}.")
        end
      end

      private

      def add_to_repo(file, version)
        logger.info('Adding new version file to repository.')

        sh "git add #{file}"
        sh 'git add Gemfile.lock' if File.exist? 'Gemfile.lock'
        sh "git commit -m 'Version bump to #{version}'"
      end

      def version_update(&block)
        file = FeduxOrgStdlib::VersionManagement::RubygemVersionFile.read(version_file)
        old_version = file.version
        block.call(file)
        new_version = file.version

        file.write(version_file)

        logger.info("Updated version. It was \"#{old_version}\". It is now \"#{new_version}\".")
        add_to_repo(version_file, file.version)
      end
    end
  end
end