#
# Author:: Adam Jacob (<adam@chef.io>)
# Copyright:: Copyright (c) Chef Software 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_relative "../knife"
require_relative "core/node_presenter"
require_relative "core/formatting_options"

class Chef
  class Knife
    class Search < Knife

      include Knife::Core::MultiAttributeReturnOption

      deps do
        require "chef/node" unless defined?(Chef::Node)
        require "chef/environment" unless defined?(Chef::Environment)
        require "chef/api_client"  unless defined?(Chef::APIClient)
        require "chef/search/query" unless defined?(Chef::Search::Query)
      end

      include Knife::Core::FormattingOptions

      banner "knife search INDEX QUERY (options)"

      option :start,
        short: "-b ROW",
        long: "--start ROW",
        description: "The row to start returning results at.",
        default: 0,
        proc: lambda { |i| i.to_i }

      option :rows,
        short: "-R INT",
        long: "--rows INT",
        description: "The number of rows to return.",
        default: nil,
        proc: lambda { |i| i.to_i }

      option :run_list,
        short: "-r",
        long: "--run-list",
        description: "Show only the run list."

      option :id_only,
        short: "-i",
        long: "--id-only",
        description: "Show only the ID of matching objects."

      option :query,
        short: "-q QUERY",
        long: "--query QUERY",
        description: "The search query; useful to protect queries starting with -."

      option :filter_result,
        short: "-f FILTER",
        long: "--filter-result FILTER",
        description: "Only return specific attributes of the matching objects; for example: \"ServerName=name, Kernel=kernel.version\"."

      def run
        read_cli_args

        if @type == "node"
          ui.use_presenter Knife::Core::NodePresenter
        end

        q = Chef::Search::Query.new

        result_items = []
        result_count = 0

        search_args = {}
        search_args[:fuzz] = true
        search_args[:start] = config[:start] if config[:start]
        search_args[:rows] = config[:rows] if config[:rows]
        if config[:filter_result]
          search_args[:filter_result] = create_result_filter(config[:filter_result])
        elsif (not ui.config[:attribute].nil?) && (not ui.config[:attribute].empty?)
          search_args[:filter_result] = create_result_filter_from_attributes(ui.config[:attribute])
        elsif config[:id_only]
          search_args[:filter_result] = create_result_filter_from_attributes([])
        end

        begin
          q.search(@type, @query, search_args) do |item|
            formatted_item = {}
            if config[:id_only]
              formatted_item = format_for_display({ "id" => item["__display_name"] })
            elsif item.is_a?(Hash)
              # doing a little magic here to set the correct name
              formatted_item[item["__display_name"]] = item.reject { |k| k == "__display_name" }
            else
              formatted_item = format_for_display(item)
            end
            result_items << formatted_item
            result_count += 1
          end
        rescue Net::HTTPClientException => e
          msg = Chef::JSONCompat.from_json(e.response.body)["error"].first
          ui.error("knife search failed: #{msg}")
          exit 99
        end

        if ui.interchange?
          output({ results: result_count, rows: result_items })
        else
          ui.log "#{result_count} items found"
          ui.log("\n")
          result_items.each do |item|
            output(item)
            unless config[:id_only]
              ui.msg("\n")
            end
          end
        end

        # return a "failure" code to the shell so that knife search can be used in pipes similar to grep
        exit 1 if result_count == 0
      end

      def read_cli_args
        if config[:query]
          if @name_args[1]
            ui.error "Please specify query as an argument or an option via -q, not both"
            ui.msg opt_parser
            exit 1
          end
          @type = name_args[0]
          @query = config[:query]
        else
          case name_args.size
          when 0
            ui.error "No query specified"
            ui.msg opt_parser
            exit 1
          when 1
            @type = "node"
            @query = name_args[0]
          when 2
            @type = name_args[0]
            @query = name_args[1]
          end
        end
      end

      # This method turns a set of key value pairs in a string into the appropriate data structure that the
      # chef-server search api is expecting.
      # expected input is in the form of:
      # -f "return_var1=path.to.attribute, return_var2=shorter.path"
      #
      # a more concrete example might be:
      # -f "env=chef_environment, ruby_platform=languages.ruby.platform"
      #
      # The end result is a hash where the key is a symbol in the hash (the return variable)
      # and the path is an array with the path elements as strings (in order)
      # See lib/chef/search/query.rb for more examples of this.
      def create_result_filter(filter_string)
        final_filter = {}
        filter_string.delete!(" ")
        filters = filter_string.split(",")
        filters.each do |f|
          return_id, attr_path = f.split("=")
          final_filter[return_id.to_sym] = attr_path.split(".")
        end
        final_filter
      end

      def create_result_filter_from_attributes(filter_array)
        final_filter = {}
        filter_array.each do |f|
          final_filter[f] = f.split(".")
        end
        # adding magic filter so we can actually pull the name as before
        final_filter["__display_name"] = [ "name" ]
        final_filter
      end

    end
  end
end