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

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

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

      DEFAULT_SCOPE = 'users pledges-to-me my-campaign'

      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!({
         :email          => raw_info['data']['attributes']['email'],
         :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,
         :access_token   => access_token.token,
         :refresh_token  => access_token.refresh_token
        })
      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('/oauth2/api/current_user', info_options).body)
      # end

      def raw_info
        @raw_info ||= begin
          response = client.request(
              :get, 'https://api.patreon.com/oauth2/api/current_user',
              headers: {
                  'Authorization' => "Bearer #{access_token.token}"
              },
              parse: :json
          )
          response.parsed
        end
      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