# https://github.com/doumart/omniauth-patreon-v2

require 'omniauth/strategies/oauth2'
require 'json'

module OmniAuth
  module Strategies
    class Patreon < OmniAuth::Strategies::OAuth2

      DEFAULT_SCOPE = 'identity identity[email] identity[memberships]'

      option :name, 'patreon'
      option :client_options, {
          :authorize_url => '/oauth2/authorize',
          :site => 'https://www.patreon.com',
          :token_url => '/api/oauth2/token'
      }

      uid { raw_info["data"]["id"] }

      info do
        prune!({
                   :first_name => raw_info["data"]["attributes"]['first_name'],
                   :last_name => raw_info["data"]["attributes"]['last_name'],
                   :full_name => raw_info["data"]["attributes"]['full_name'],
                   :nickname => raw_info["data"]["attributes"]['full_name'].gsub('ä','ae').gsub('ö','oe').gsub('ü','ue').gsub(' ','_').downcase,
                   :image_url => raw_info["data"]["attributes"]['image_url'],
                   :email => raw_info["data"]["attributes"]['email']
               })
      end

      def authorize_params
        super.tap do |params|
          options[:authorize_options].each do |k|
            params[k] = request.params[k.to_s] unless [nil, ''].include?(request.params[k.to_s])
          end
          params[:scope] = get_scope(params)
          session['omniauth.state'] = params[:state] if params[:state]
        end
      end

      extra do
        hash = {}
        hash['raw_info'] = raw_info unless skip_info?
        prune! hash
      end

      def raw_info
        @raw_info =  MultiJson.decode(access_token.get('/api/oauth2/v2/identity?include=memberships&fields[pledge]=total_historical_amount_cents,is_paused,outstanding_payment_amount_cents,declined_since', info_options).body)
#         @raw_info =  MultiJson.decode(access_token.get('/api/oauth2/v2/identity?include=campaign&fields[pledge]=total_historical_amount_cents,is_paused,outstanding_payment_amount_cents,declined_since', info_options).body)
      end

      def info_options
        params = {}
        params.merge!({fields: {user: (options[:info_fields] || 'full_name,first_name,email')}})
        params.merge!({locale: options[:locale]}) if options[:locale]

        { params: params }
      end


      def callback_url
        options[:redirect_uri] || full_host + script_name + callback_path
      end

      def get_scope(params)
        raw_scope = params[:scope] || DEFAULT_SCOPE
        scope_list = raw_scope.split(' ').map { |item| item.split(',') }.flatten
        scope_list.join(' ')
      end
      def prune!(hash)
        hash.delete_if do |_, value|
          prune!(value) if value.is_a?(Hash)
          value.nil? || (value.respond_to?(:empty?) && value.empty?)
        end
      end
    end
  end
end