require 'time'
require 'uri'

module RingCentralSdk
  module REST
    module Cache
      # Extensions cache is a local store that can retrieve all
      # extensions for use locally
      class Extensions
        attr_accessor :client
        attr_accessor :account_id
        attr_reader :extensions_hash
        attr_reader :extensions_num2id
        attr_reader :last_retrieved

        def initialize(client)
          @client = client
          @account_id = '~'
          flush
        end

        def flush
          @extensions_hash = {}
          @extensions_num2id = {}
          @last_retrieved = -1
        end

        def retrieve(params = {}, retrieve_all = true)
          @last_retrieved = Time.now.to_i
          uri = URI.parse "account/#{@account_id}/extension"
          uri.query = URI.encode_www_form(params) unless params.empty?
          res = @client.http.get do |req|
            req.url uri.to_s
            if retrieve_all
              req.params['page'] = 1
              req.params['perPage'] = 1000
            end
          end
          load_extensions(res.body['records'])
          if retrieve_all
            while res.body.key?('navigation') && res.body['navigation'].key?('nextPage')
              res = @client.http.get do |req|
                req.url res.body['navigation']['nextPage']['uri']
              end
              load_extensions(res.body['records'])
            end
          end
          inflate_num2id
          @extensions_hash
        end

        def load_extensions(api_extensions)
          api_extensions.each do |extension|
            if extension.key?('id') && extension['id'] > 0
              @extensions_hash[extension['id'].to_s] = extension
            end
          end
        end

        def retrieve_all
          retrieve({}, true)
        end

        def inflate_num2id
          num2id = {}
          @extensions_hash.each do |_, v|
            if v.key?('id') && v['id'] > 0 && v.key?('extensionNumber') && !v['extensionNumber'].empty?
              num2id[v['extensionNumber']] = v['id'].to_s
            end
          end
          @extensions_num2id = num2id
          num2id
        end

        def get_extension_by_id(extension_id)
          extension_id = extension_id.to_s unless extension_id.is_a? String
          return @extensions_hash[extension_id] if @extensions_hash.key? extension_id
          nil
        end

        def get_extension_by_number(extension_number)
          unless extension_number.is_a? String
            extension_number = extension_number.to_s
          end
          if @extensions_num2id.key?(extension_number)
            extension_id = @extensions_num2id[extension_number]
            if @extensions_hash.key?(extension_id)
              return @extensions_hash[extension_id]
            end
          end
          nil
        end

        def get_department_members(department_id)
          department_id = department_id.to_s unless department_id.is_a? String
          if department_id !~ /^[0-9]+$/
            raise 'department_id parameter must be a positive integer'
          end

          members = []

          res = @client.http.get do |req|
            req.url "account/#{account_id}/department/#{department_id}/members"
          end

          if res.body.key? 'records'
            res.body['records'].each do |extension|
              if extension.key? 'id'
                member = get_extension_by_id extension['id']
                members.push member unless member.nil?
              end
            end
          end

          members
        end
      end
    end
  end
end