module Oxidized
  class HTTP < Source
    def initialize
      @cfg = Oxidized.config.source.http
      super
    end

    def setup
      if @cfg.url.empty?
        raise NoConfig, 'no source http url config, edit ~/.config/oxidized/config'
      end
    end

    require "net/http"
    require "uri"
    require "json"

    def load
      nodes = []
      uri = URI.parse(@cfg.url)
      http = Net::HTTP.new(uri.host, uri.port)
      http.use_ssl = true if uri.scheme == 'https'
      http.verify_mode = OpenSSL::SSL::VERIFY_NONE unless @cfg.secure

      # map headers
      headers = {}
      @cfg.headers.each do |header, value|
        headers[header] = value
      end

      request = Net::HTTP::Get.new(uri.request_uri, headers)
      if (@cfg.user? && @cfg.pass?)
        request.basic_auth(@cfg.user, @cfg.pass)
      end

      response = http.request(request)
      data = JSON.parse(response.body)
      data.each do |node|
        next if node.empty?
        # map node parameters
        keys = {}
        @cfg.map.each do |key, want_position|
          want_positions = want_position.split('.')
          keys[key.to_sym] = node_var_interpolate node.dig(*want_positions)
        end
        keys[:model] = map_model keys[:model] if keys.has_key? :model

        # map node specific vars
        vars = {}
        @cfg.vars_map.each do |key, want_position|
          want_positions = want_position.split('.')
          vars[key.to_sym] = node_var_interpolate node.dig(*want_positions)
        end
        keys[:vars] = vars unless vars.empty?

        nodes << keys
      end
      nodes
    end
  end
end

if RUBY_VERSION < '2.3'
  class Hash
    def dig(key, *rest)
      value = self[key]
      if value.nil? || rest.empty?
        value
      elsif value.respond_to?(:dig)
        value.dig(*rest)
      else # foo.bar.baz (bar exist but is not hash)
        return nil
      end
    end
  end
end