module ForemanSalt
  module Concerns
    module HostManagedExtensions
      extend ActiveSupport::Concern

      module Overrides
        def configuration?
          super || !!salt_proxy
        end

        def params
          params = super
          params['salt_master'] = salt_master if salt_master.present?
          params
        end

        def smart_proxy_ids
          ids = super
          [salt_proxy, hostgroup.try(:salt_proxy)].compact.each do |proxy|
            ids << proxy.id
          end
          ids
        end

        def inherited_attributes
          super + %w[salt_proxy_id salt_environment_id]
        end
      end

      included do
        has_many :host_salt_modules, foreign_key: :host_id, class_name: '::ForemanSalt::HostSaltModule'
        has_many :salt_modules, through: :host_salt_modules, class_name: '::ForemanSalt::SaltModule'

        belongs_to :salt_proxy, class_name: 'SmartProxy'
        belongs_to :salt_environment, class_name: 'ForemanSalt::SaltEnvironment'

        prepend Overrides

        scoped_search relation: :salt_modules, on: :name, complete_value: true, rename: :salt_state
        scoped_search relation: :salt_environment, on: :name, complete_value: true, rename: :salt_environment
        scoped_search relation: :salt_proxy, on: :name, complete_value: true, rename: :saltmaster

        validate :salt_modules_in_host_environment

        after_build :ensure_salt_autosign, if: ->(host) { host.salt_proxy }
        before_destroy :remove_salt_minion, if: ->(host) { host.salt_proxy }
      end

      def salt_params
        variables = ForemanSalt::SaltVariable.where(salt_module_id: all_salt_modules.pluck(:id), override: true)
        values = variables.values_hash(self)

        variables.each_with_object({}) do |var, memo|
          value = values[var]
          memo[var.key] = value if value
          memo
        end
      end

      def host_params_grains_name
        'salt_grains'
      end

      def autosign_grain_name
        'autosign_key'
      end

      def salt_modules_for_enc
        all_salt_modules.collect(&:name).uniq
      end

      def all_salt_modules
        return [] unless salt_environment

        modules = salt_modules + (hostgroup ? hostgroup.all_salt_modules : [])
        ForemanSalt::SaltModule.in_environment(salt_environment).where(id: modules)
      end

      def salt_master
        salt_proxy.to_s
      end

      def salt_modules_in_host_environment
        return unless salt_modules.any?

        if salt_environment
          errors.add(:base, _('Salt states must be in the environment of the host')) unless (salt_modules - salt_environment.salt_modules).empty?
        else
          errors.add(:base, _('Host must have an environment in order to set salt states'))
        end
      end

      def derive_salt_grains(use_autosign: false)
        grains = {}
        begin
          Rails.logger.info('Derive Salt Grains from host_params and autosign_key')
          grains[autosign_grain_name] = salt_autosign_key if use_autosign && !salt_autosign_key.nil?
          unless host_params[host_params_grains_name].nil? ||
                 host_params[host_params_grains_name].class != Hash
            grains.merge!(host_params[host_params_grains_name])
          end
        rescue Foreman::Exception => e
          Rails.logger.warn("Unable to derive Salt Grains: #{e}")
        end
        grains
      end

      private

      def ensure_salt_autosign
        remove_salt_autosign
        create_salt_autosign
      end

      def remove_salt_minion
        remove_salt_autosign
        remove_salt_key
      end

      def remove_salt_key
        Rails.logger.info("Remove salt key for host #{fqdn}")
        api = ProxyAPI::Salt.new(url: salt_proxy.url)
        api.key_delete(name)
      end

      def remove_salt_autosign
        key = salt_autosign_key
        return if key.nil?
        Rails.logger.info("Remove salt autosign key for host #{fqdn}")
        begin
          api = ProxyAPI::Salt.new(url: salt_proxy.url)
          api.autosign_remove_key(key)
        rescue Foreman::Exception => e
          Rails.logger.warn("Unable to remove salt autosign for #{fqdn}: #{e}")
        end
      end

      def generate_provisioning_key
        SecureRandom.hex(10)
      end

      def create_salt_autosign
        Rails.logger.info("Create salt autosign key for host #{fqdn}")
        api = ProxyAPI::Salt.new(url: salt_proxy.url)
        key = generate_provisioning_key
        api.autosign_create_key(key)
        update(salt_autosign_key: key)
        update(salt_status: ForemanSalt::SaltStatus.minion_auth_waiting)
      rescue Foreman::Exception => e
        Rails.logger.warn("Unable to create salt autosign for #{fqdn}: #{e}")
      end
    end
  end
end

# rubocop:disable Style/ClassAndModuleChildren
class Host::Managed
  class Jail < ::Safemode::Jail
    allow :salt_environment, :salt_master, :derive_salt_grains
  end
end
# rubocop:enable Style/ClassAndModuleChildren