require 'net/http'
require 'cgi/util'
require 'multi_json'

# helpers
require 'domoscio_rails/version'
require 'domoscio_rails/json'
require 'domoscio_rails/errors'
require 'domoscio_rails/authorization_token'

# resources
require 'domoscio_rails/http_calls'
require 'domoscio_rails/resource'
require 'domoscio_rails/adaptative/path_rule'
require 'domoscio_rails/adaptative/rule_input'
require 'domoscio_rails/adaptative/rule_output'
require 'domoscio_rails/adaptative/rule_condition'
require 'domoscio_rails/admin/user'
require 'domoscio_rails/student/student'
require 'domoscio_rails/knowledge/knowledge_graph'
require 'domoscio_rails/knowledge/knowledge_edge'
require 'domoscio_rails/knowledge/knowledge_node'
require 'domoscio_rails/metadata/tag'
require 'domoscio_rails/metadata/tagging'
require 'domoscio_rails/metadata/tag_set'
require 'domoscio_rails/metadata/tag_edge'
require 'domoscio_rails/data/knowledge_node_student'
require 'domoscio_rails/data/result'
require 'domoscio_rails/utils/review_util'


module DomoscioRails

  class Configuration
    attr_accessor :preproduction, :root_url,
    :client_id, :client_passphrase,
    :temp_dir, :disabled
    
    def disabled
      @disabled || false
    end

    def preproduction
      @preproduction || false
    end

    def root_url
      @root_url || (@preproduction == true  ? "http://stats-engine.domoscio.com" : "http://localhost:3000/")
    end
  end

  class << self
    attr_accessor :configuration
  end

  def self.configure
    self.configuration ||= Configuration.new
    yield configuration
  end

  def self.api_uri(url='')
    URI(configuration.root_url + url)
  end

  #
  # - +method+: HTTP method; lowercase symbol, e.g. :get, :post etc.
  # - +url+: the part after Configuration#root_url
  # - +params+: hash; entity data for creation, update etc.; will dump it by JSON and assign to Net::HTTPRequest#body
  # - +filters+: hash; pagination params etc.; will encode it by URI and assign to URI#query
  # - +headers+: hash; request_headers by default
  # - +before_request_proc+: optional proc; will call it passing the Net::HTTPRequest instance just before Net::HTTPRequest#request
  #
  # Raises DomoscioRails::ResponseError if response code != 200.
  #
  def self.request(method, url, params={}, filters={}, headers = request_headers, before_request_proc = nil)
    return false if @disabled
    uri = api_uri(url)
    uri.query = URI.encode_www_form(filters) unless filters.empty?    
    
    res = Net::HTTP.start(uri.host, uri.port) do |http| # , use_ssl: uri.scheme == 'https') do |http|
      req = Net::HTTP::const_get(method.capitalize).new(uri.request_uri, headers)
      req.body = DomoscioRails::JSON.dump(params)
      before_request_proc.call(req) if before_request_proc
      http.request req
    end

    # decode json data
    begin
      data = DomoscioRails::JSON.load(res.body.nil? ? '' : res.body)
    rescue MultiJson::LoadError
      data = {}
    end

    ############### TEMP!!!! #######################################################
    #pp method, uri.request_uri, params #, filters, headers
    #pp res, data
    #puts

    # if (!(res.is_a? Net::HTTPOK))
    #   ex = DomoscioRails::ResponseError.new(uri, res.code, data)
    #   ############## TEMP!!!! ########################################################
    #   #pp ex, data
    #   raise ex
    # end

    # copy pagination info if any
    # ['x-number-of-pages', 'x-number-of-items'].each { |k|
#       filters[k.gsub('x-number-of-', 'total_')] = res[k].to_i if res[k]
#     }

    data
  end

  private

  def self.user_agent
    @uname ||= get_uname

    {
      bindings_version: DomoscioRails::VERSION,
      lang: 'ruby',
      lang_version: "#{RUBY_VERSION} p#{RUBY_PATCHLEVEL} (#{RUBY_RELEASE_DATE})",
      platform: RUBY_PLATFORM,
      uname: @uname
    }
  end

  def self.get_uname
    `uname -a 2>/dev/null`.strip if RUBY_PLATFORM =~ /linux|darwin/i
  rescue Errno::ENOMEM
    'uname lookup failed'
  end

  def self.request_headers
    auth_token = DomoscioRails::AuthorizationToken::Manager.get_token
    headers = {
      'user_agent' => "DomoscioRails V2 RubyBindings/#{DomoscioRails::VERSION}",
      'Authorization' => "Token token=#{DomoscioRails.configuration.client_passphrase}",#"#{auth_token['token_type']} #{auth_token['access_token']}",
      'Content-Type' => 'application/json'
    }
    # begin
#       headers.update('x_mangopay_client_user_agent' => DomoscioRails::JSON.dump(user_agent))
#     rescue => e
#       headers.update('x_mangopay_client_raw_user_agent' => user_agent.inspect, error: "#{e} (#{e.class})")
#     end
  end
  
  
end