module MRuby

module LoadGems
  def gembox(gemboxfile)
    gembox = File.expand_path("#{gemboxfile}.gembox", "#{MRUBY_ROOT}/mrbgems")
    fail "Can't find gembox '#{gembox}'" unless File.exist?(gembox)

    GemBox.config = self
    GemBox.path = gembox

    instance_eval File.read(gembox)

    GemBox.path = nil
  end

  def gem(gemdir, &block)
    caller_dir = File.expand_path(File.dirname(/^(.*?):\d/.match(caller.first).to_a[1]))

    if gemdir.is_a?(Hash)
      gemdir = load_special_path_gem(gemdir)
    elsif GemBox.path && gemdir.is_a?(String)
      gemdir = File.expand_path(gemdir, File.dirname(GemBox.path))
    else
      gemdir = File.expand_path(gemdir, caller_dir)
    end

    gemrake = File.join(gemdir, "mrbgem.rake")

    fail "Can't find #{gemrake}" unless File.exist?(gemrake)
    Gem.current = nil
    load gemrake
    return nil unless Gem.current

    Gem.current.dir = gemdir
    Gem.current.build = MRuby::Build.current
    Gem.current.build_config_initializer = block
    gems << Gem.current

    cxx_srcs = ['src', 'test', 'tools'].map do |subdir|
      Dir.glob("#{Gem.current.dir}/#{subdir}/*.{cpp,cxx,cc}")
    end.flatten
    enable_cxx_abi unless cxx_srcs.empty?

    Gem.current
  end

  def load_special_path_gem(params)
    if params[:github]
      params[:git] = "https://github.com/#{params[:github]}.git"
    elsif params[:bitbucket]
      if params[:method] == "ssh"
        params[:git] = "git@bitbucket.org:#{params[:bitbucket]}.git"
      else
        params[:git] = "https://bitbucket.org/#{params[:bitbucket]}.git"
      end
    end

    if params[:core]
      gemdir = "#{root}/mrbgems/#{params[:core]}"
    elsif params[:git]
      url = params[:git]
      gemdir = "#{gem_clone_dir}/#{url.match(/([-\w]+)(\.[-\w]+|)$/).to_a[1]}"

      # by default the 'master' branch is used
      branch = params[:branch] ? params[:branch] : 'master'

      if File.exist?(gemdir)
        if $pull_gems
          git.run_pull gemdir, url
        else
          gemdir
        end
      else
        options = [params[:options]] || []
        options << "--branch \"#{branch}\""
        options << "--depth 1" unless params[:checksum_hash]
        FileUtils.mkdir_p "#{gem_clone_dir}"
        git.run_clone gemdir, url, options
      end

      if params[:checksum_hash]
        # Jump to the specified commit
        git.run_checkout gemdir, params[:checksum_hash]
      else
        # Jump to the top of the branch
        git.run_checkout gemdir, branch
      end
    else
      fail "unknown gem option #{params}"
    end

    gemdir
  end

  def enable_gems?
    !@gems.empty?
  end
end # LoadGems

end # MRuby

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