require 'ore/paths'

require 'rubygems'

module Ore
  module RubyGems
    include Paths

    #
    # Populates a Gem Specification using the metadata of the project.
    #
    # @yield [gemspec]
    #   The given block will be passed the populated Gem Specification
    #   object.
    #
    # @yieldparam [Gem::Specification] gemspec
    #   The newly created Gem Specification.
    #
    # @return [Gem::Specification]
    #   The Gem Specification.
    #
    # @see http://rubygems.rubyforge.org/rdoc/Gem/Specification.html
    #
    # @since 0.1.5
    #
    def to_gemspec
      Gem::Specification.new do |gemspec|
        gemspec.name = @name.to_s
        gemspec.version = @version.to_s
        gemspec.summary = @summary.to_s
        gemspec.description = @description.to_s
        gemspec.licenses = @licenses
        gemspec.authors = @authors
        gemspec.homepage = @homepage
        gemspec.email = @emails
        gemspec.date = @date

        @require_paths.each do |path|
          unless gemspec.require_paths.include?(path)
            gemspec.require_paths << path
          end
        end

        gemspec.executables = @executables

        # default_executable is deprecated in RubyGems 1.7.0 and will be
        # removed after 2011-10-01.
        if Gem::VERSION < '1.7.'
          gemspec.default_executable = @default_executable
        end

        # forcibly set the @has_rdoc ivar, as RubyGems 1.5.x disables the
        # #has_rdoc= writer method.
        if gemspec.instance_variable_defined?('@has_rdoc')
          case @documentation
          when :yard
            gemspec.instance_variable_set('@has_rdoc','yard')
          when :rdoc
            gemspec.instance_variable_set('@has_rdoc',true)
          when nil
            gemspec.instance_variable_set('@has_rdoc',false)
          end
        end

        gemspec.extra_rdoc_files = @extra_doc_files
        gemspec.files = @files
        gemspec.test_files = @test_files
        gemspec.post_install_message = @post_install_message

        gemspec.requirements = @requirements

        if gemspec.respond_to?(:required_ruby_version=)
          gemspec.required_ruby_version = @required_ruby_version
        end

        if gemspec.respond_to?(:required_rubygems_version=)
          gemspec.required_rubygems_version = @required_rubygems_version
        end

        @dependencies.each do |dep|
          gemspec.add_dependency(dep.name,*dep.versions)
        end

        if gemspec.respond_to?(:add_runtime_dependency)
          @runtime_dependencies.each do |dep|
            gemspec.add_runtime_dependency(dep.name,*dep.versions)
          end
        else
          @runtime_dependencies.each do |dep|
            gemspec.add_dependency(dep.name,*dep.versions)
          end
        end

        if gemspec.respond_to?(:add_development_dependency)
          @development_dependencies.each do |dep|
            gemspec.add_development_dependency(dep.name,*dep.versions)
          end
        else
          @development_dependencies.each do |dep|
            gemspec.add_dependency(dep.name,*dep.versions)
          end
        end

        # legacy information
        if gemspec.respond_to?(:rubyforge_project=)
          gemspec.rubyforge_project = gemspec.name
        end

        yield gemspec if block_given?
      end
    end

    #
    # Builds a gem for the project.
    #
    # @return [Pathname]
    #   The path to the built gem file within the `pkg/` directory.
    #
    # @since 0.1.5
    #
    def to_gem
      pkg_dir = @root.join(@@pkg_dir)
      FileUtils.mkdir_p(pkg_dir)

      gem_file = Gem::Builder.new(self.to_gemspec).build
      pkg_path = @root.join(pkg_file)

      FileUtils.mv(gem_file,pkg_path)
      return pkg_path
    end
  end
end