#
# Author:: John Keiser (<jkeiser@opscode.com>)
# Copyright:: Copyright (c) 2013 Opscode, Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

require 'chef_fs/file_system/chef_repository_file_system_cookbook_entry'
require 'chef_fs/file_system/cookbook_dir'
require 'chef/cookbook/chefignore'
require 'chef/cookbook/cookbook_version_loader'

module ChefFS
  module FileSystem
    class ChefRepositoryFileSystemCookbookDir < ChefRepositoryFileSystemCookbookEntry
      def initialize(name, parent, file_path = nil)
        super(name, parent, file_path)
      end

      def chef_object
        begin
          loader = Chef::Cookbook::CookbookVersionLoader.new(file_path, parent.chefignore)
          # We need the canonical cookbook name if we are using versioned cookbooks, but we don't
          # want to spend a lot of time adding code to the main Chef libraries
          if Chef::Config[:versioned_cookbooks]
            _canonical_name = canonical_cookbook_name(File.basename(file_path))
            fail "When versioned_cookbooks mode is on, cookbook #{file_path} must match format <cookbook_name>-x.y.z"  unless _canonical_name

            # KLUDGE: We shouldn't have to use instance_variable_set
            loader.instance_variable_set(:@cookbook_name, _canonical_name)
          end

          loader.load_cookbooks
          return loader.cookbook_version
        rescue
          Chef::Log.error("Could not read #{path_for_printing} into a Chef object: #{$!}")
        end
        nil
      end

      def children
        Dir.entries(file_path).sort.
            select { |child_name| can_have_child?(child_name, File.directory?(File.join(file_path, child_name))) }.
            map do |child_name|
              segment_info = CookbookDir::COOKBOOK_SEGMENT_INFO[child_name.to_sym] || {}
              ChefRepositoryFileSystemCookbookEntry.new(child_name, self, nil, segment_info[:ruby_only], segment_info[:recursive])
            end.
            select { |entry| !(entry.dir? && entry.children.size == 0) }
      end

      def can_have_child?(name, is_dir)
        if is_dir
          # Only the given directories will be uploaded.
          return CookbookDir::COOKBOOK_SEGMENT_INFO.keys.include?(name.to_sym) && name != 'root_files'
        end

        super(name, is_dir)
      end

      # Exposed as a class method so that it can be used elsewhere
      def self.canonical_cookbook_name(entry_name)
        name_match = ChefFS::FileSystem::CookbookDir::VALID_VERSIONED_COOKBOOK_NAME.match(entry_name)
        return nil if name_match.nil?
        return name_match[1]
      end

      def canonical_cookbook_name(entry_name)
        self.class.canonical_cookbook_name(entry_name)
      end
    end
  end
end