# frozen_string_literal: true

require_relative 'error'

module LeapSalesforce
  # Code related to authorising in LeapSalesforce
  # Specific authorisation parameters are stored here. More general settings
  # are stored at the layer above this
  module Auth
    @access_token = nil
    @instance_url = nil
    # @return [String] Setup JWT trail head
    SETUP_JWT_LINK = 'https://trailhead.salesforce.com/content/learn/projects/automate-cicd-with-gitlab/https://trailhead.salesforce.com/content/learn/projects/automate-cicd-with-gitlab/integrate-with-gitlab'
    class << self
      # @return [String] Access token taken from sfdx
      attr_writer :access_token
      # Instance Url taken from sfdx
      attr_writer :instance_url
      # @return [String] Output from SFDX command
      attr_accessor :sfdx_display_output

      # @return [String] Access token taken from sfdx. Value is extracted if
      #   not cached. If not using sfdx this will not be stored here but
      #   within Soaspec which caches the OAuth result
      def access_token
        return @access_token if @access_token

        extract_sfdx_variables
        raise 'Instance URL was not set correctly' if @access_token&.empty?

        @access_token
      end

      # @return [String] Instance URL taken from sfdx. Value is extracted if
      #   not cached
      def instance_url
        return @instance_url if @instance_url

        extract_sfdx_variables
        raise 'Instance URL was not set correctly' if @instance_url&.empty?

        @instance_url
      end

      # @return [Boolean] Whether Sfdx authentication variables are set
      def sfdx_variables?
        !(access_token && instance_url).nil?
      end

      # @return [TrueClass] Whether JWT file exists Exception is raised if it
      #   is not
      def jwt_file?
        ENV['JWT_FOLDER'] ||= Dir.exist?('JWT') ? 'JWT' : 'assets'
        unless File.exist?(File.join(ENV['JWT_FOLDER'], 'server.key'))
          raise LeapSalesforce::SetupError, 'Please create JWT file in ' \
        " '#{ENV['JWT_FOLDER']}/server.key' following #{SETUP_JWT_LINK}"
        end

        true
      end

      # @return [Boolean] Whether SFDX Access token and instance url have been manually set
      #   If not they will be attempted to be retrieved via JWT, SF_USERNAME & SF_CONSUMER_KEY
      def manually_set_auth?
        ENV['SFDX_ACCESS_TOKEN'] ||= ENV['SCRATCH_ACCESS_TOKEN']
        ENV['SFDX_INSTANCE_URL'] ||= ENV['SCRATCH_INSTANCE_URL']
        return false unless ENV['SFDX_ACCESS_TOKEN'] && ENV['SFDX_INSTANCE_URL']

        !ENV['SFDX_ACCESS_TOKEN'].empty? && !ENV['SFDX_INSTANCE_URL'].empty?
      end

      # Extract sfdx variables and store them
      # Set ENV['SCRATCH_ORG'] to true to authenticate and run against sandbox
      def extract_sfdx_variables
        return unless LeapSalesforce.sfdx

        LeapSalesforce.client_id = ENV['SF_CONSUMER_KEY']
        if manually_set_auth?
          url_obtained = ENV['SFDX_INSTANCE_URL']
          self.instance_url = url_obtained[-1] == '/' ? url_obtained[0..-2] : url_obtained
          self.access_token = ENV['SFDX_ACCESS_TOKEN']
          return
        end

        unless ENV['SF_USERNAME'] && ENV['SF_CONSUMER_KEY']
          logger.error "No CREDENTIALS FILE found at #{CREDENTIAL_FILE}." unless File.exist? CREDENTIAL_FILE
          raise SetupError,
                'Please set SF_USERNAME and SF_CONSUMER_KEY environment variables'
        end
        script_name = if ENV['SCRATCH_ORG'] && !ENV['SCRATCH_ORG'].empty?
                        raise "Please set SCRATCH_ORG_ALIAS when SCRATCH_ORG(#{ENV['SCRATCH_ORG']}) is set" unless ENV['SCRATCH_ORG_ALIAS']

                        puts "Using sandbox #{ENV['SCRATCH_ORG_ALIAS']}"
                        'get_scratch_auth'
                      else
                        'get_prod_auth'
                      end
        puts "Using JWT folder '#{ENV['JWT_FOLDER']}'"
        self.sfdx_display_output = `sh #{__dir__}/#{script_name}.sh`
        self.access_token = from_output 'Access Token'
        url_obtained = from_output 'Instance Url'
        self.instance_url = url_obtained[-1] == '/' ? url_obtained[0..-2] : url_obtained
      end

      private

      def from_output(variable)
        var_line = sfdx_display_output.lines.find do |line|
          line.start_with? variable
        end
        raise LeapSalesforce::SetupError, "Error retrieving from #{sfdx_display_output}" unless var_line

        var_line.split[-1]
      end
    end
  end
end