#
# Author:: John Keiser (<jkeiser@opscode.com>)
# Copyright:: Copyright (c) 2012 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/base_fs_dir'
require 'chef_fs/file_system/rest_list_entry'
require 'chef_fs/file_system/not_found_error'

module ChefFS
  module FileSystem
    class RestListDir < BaseFSDir
      def initialize(name, parent, api_path = nil, data_handler = nil)
        super(name, parent)
        @api_path = api_path || (parent.api_path == "" ? name : "#{parent.api_path}/#{name}")
        @data_handler = data_handler
      end

      attr_reader :api_path
      attr_reader :data_handler

      def child(name)
        result = @children.select { |child| child.name == name }.first if @children
        result ||= can_have_child?(name, false) ?
                   _make_child_entry(name) : NonexistentFSObject.new(name, self)
      end

      def can_have_child?(name, is_dir)
        name =~ /\.json$/ && !is_dir
      end

      def children
        begin
          @children ||= rest.get_rest(api_path).keys.sort.map do |key|
            _make_child_entry("#{key}.json", true)
          end
        rescue Net::HTTPServerException => e
          if $!.response.code == "404"
            raise ChefFS::FileSystem::NotFoundError.new(self, $!)
          else
            raise ChefFS::FileSystem::OperationFailedError.new(:children, self, e)
          end
        end
      end

      def identity_key
        'name'
      end

      # NOTE if you change this significantly, you will likely need to change
      # DataBagDir.create_child as well.
      def create_child(name, file_contents)
        begin
          object = Chef::JSONCompat.from_json(file_contents).to_hash
        rescue JSON::ParserError => e
          raise ChefFS::FileSystem::OperationFailedError.new(:create_child, self, e), "Parse error reading JSON creating child '#{name}': #{e}"
        end

        result = _make_child_entry(name, true)

        if data_handler
          object = data_handler.normalize(object, result)
        end

        base_name = name[0,name.length-5]
        if object[identity_key] != base_name
          raise ChefFS::FileSystem::OperationFailedError.new(:create_child, self), "Name in #{path_for_printing}/#{name} must be '#{base_name}' (is '#{object[identity_key]}')"
        end

        begin
          rest.post_rest(api_path, object)
        rescue Net::HTTPServerException => e
          if e.response.code == "404"
            raise ChefFS::FileSystem::NotFoundError.new(self, e)
          else
            raise ChefFS::FileSystem::OperationFailedError.new(:create_child, self, e), "Failure creating '#{name}': #{e.message}"
          end
        end

        result
      end

      def environment
        parent.environment
      end

      def rest
        parent.rest
      end

      def _make_child_entry(name, exists = nil)
        RestListEntry.new(name, self, exists)
      end
    end
  end
end