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#
# 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/chef_fs/file_system/repository/chef_repository_file_system_entry'
require 'chef/chef_fs/file_system/repository/chef_repository_file_system_cookbook_dir'
require 'chef/cookbook/chefignore'

class Chef
  module ChefFS
    module FileSystem
      module Repository
        class ChefRepositoryFileSystemCookbooksDir < ChefRepositoryFileSystemEntry
          def initialize(name, parent, file_path)
            super(name, parent, file_path)
            begin
              @chefignore = Chef::Cookbook::Chefignore.new(self.file_path)
            rescue Errno::EISDIR
            rescue Errno::EACCES
              # Work around a bug in Chefignore when chefignore is a directory
            end
          end

          attr_reader :chefignore

          def children
            super.select do |entry|
              # empty cookbooks and cookbook directories are ignored
              if !entry.can_upload?
                Chef::Log.warn("Cookbook '#{entry.name}' is empty or entirely chefignored at #{entry.path_for_printing}")
                false
              else
                true
              end
            end
          end

          def can_have_child?(name, is_dir)
            is_dir && !name.start_with?('.')
          end

          def write_cookbook(cookbook_path, cookbook_version_json, from_fs)
            cookbook_name = File.basename(cookbook_path)
            child = make_child_entry(cookbook_name)

            # Use the copy/diff algorithm to copy it down so we don't destroy
            # chefignored data.  This is terribly un-thread-safe.
            Chef::ChefFS::FileSystem.copy_to(Chef::ChefFS::FilePattern.new("/#{cookbook_path}"), from_fs, child, nil, {:purge => true})

            # Write out .uploaded-cookbook-version.json
            cookbook_file_path = File.join(file_path, cookbook_name)
            if !File.exists?(cookbook_file_path)
              FileUtils.mkdir_p(cookbook_file_path)
            end
            uploaded_cookbook_version_path = File.join(cookbook_file_path, Chef::Cookbook::CookbookVersionLoader::UPLOADED_COOKBOOK_VERSION_FILE)
            File.open(uploaded_cookbook_version_path, 'w') do |file|
              file.write(cookbook_version_json)
            end
          end

          protected

          def make_child_entry(child_name)
            ChefRepositoryFileSystemCookbookDir.new(child_name, self)
          end
        end
      end
    end
  end
end