# -*- coding: utf-8 -*-
#
# Copyright (C) 2011  Haruka Yoshihara <yoshihara@clear-code.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License version 2.1 as published by the Free Software Foundation.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

module Packnga
  # This class creates release tasks.
  #
  # Release tasks tag current version and install gem for test.
  #
  # @since 0.9.0
  class ReleaseTask
    include Rake::DSL

    # This attribute is path of HTML files written version and release date.
    # @param [String] value path of HTML files
    attr_writer :index_html_dir
    # This attribute is path of base directory of document.
    # @param [String] value path of base directory of document
    attr_writer :base_dir
    # This attribute is message when tagging in release.
    # @param [String] value message
    attr_writer :tag_message
    # Defines task for preparing to release.
    # Defined tasks update version and release-date in index files
    # and tag in git.
    # @param [Gem::Specification] spec specification for your package
    def initialize(spec)
      @spec = spec
      @index_html_dir = nil
      @tag_messsage = nil
      @publish_options = nil
      @changes = nil
      yield(self) if block_given?
      set_default_values
      define_tasks
    end

    private
    def html_base_dir
      File.join(@base_dir, "html")
    end

    def html_reference_dir
      File.join(html_base_dir, @spec.name)
    end

    def set_default_values
      @index_html_dir ||= "doc/html"
      @base_dir ||= Pathname.new("doc")
      @tag_message ||= "release #{@spec.version}!!!"
      @publish_options ||= {}
      @changes ||= ""
    end

    def define_tasks
      namespace :release do
        define_info_task
        define_reference_upload_task
        define_tag_task
      end
    end

    def define_info_task
      namespace :info do
        desc "Update version in index HTML."
        task :update do
          @index_html_dir = Pathname(@index_html_dir)
          indexes = [
            @index_html_dir + "index.html",
            @index_html_dir + "ja/index.html"
          ]
          indexes.each do |index|
            content = replaced_content = File.read(index)
            package_infos.each do |key, (old, new)|
              next if old == new
              old_regexp = /#{Regexp.escape(old)}/
              replaced_content = replaced_content.gsub(old_regexp, new)
            end

            File.open(index, "w") do |output|
              output.print(replaced_content)
            end
          end
        end
      end
    end

    def package_infos
      old_version = ENV["OLD_VERSION"]
      old_release_date = ENV["OLD_RELEASE_DATE"]
      new_release_date = ENV["RELEASE_DATE"] || Time.now.strftime("%Y-%m-%d")
      new_version = ENV["VERSION"] || @spec.version.to_s

      empty_options = []
      empty_options << "OLD_VERSION" if old_version.nil?
      empty_options << "OLD_RELEASE_DATE" if old_release_date.nil?
      empty_options << "VERSION" if new_version.empty?

      unless empty_options.empty?
        raise ArgumentError, "Specify option(s) of #{empty_options.join(", ")}."
      end

      {
        :version       => [old_version, new_version],
        :release_date  => [old_release_date, new_release_date]
      }
    end

    def define_reference_upload_task
      namespace :references do
        desc "Copy references to reference html directory."
        task :upload do
          cp_r(html_reference_dir, @index_html_dir)
        end
      end
    end

    def define_tag_task
      desc "Tag the current revision."
      task :tag do
        version = @spec.version
        sh("git tag -a #{version} -m '#{@tag_message}'")
      end
    end
  end
end