module Devops
  module Model
    class StackBase < MongoModel

      attr_accessor :id, :project, :deploy_env, :stack_template,
        :cloud_stack_id, :provider, :parameters, :details, :owner

      types id: {type: String, empty: false},
            provider: {type: String, empty: false},
            project: {type: String},
            deploy_env: {type: String},
            stack_template: {type: String, empty: false},
            cloud_stack_id: {type: String, nil: true},
            owner: {type: String}
            # details: {type: Hash, nil: true} # Hash type isn't supported yet

      def initialize attrs={}
        self.provider = self.class.provider

        self.id = attrs['id']
        self.project = attrs['project']
        self.deploy_env = attrs['deploy_env']
        self.stack_template = attrs['stack_template']
        self.cloud_stack_id = attrs['cloud_stack_id']
        self.parameters = attrs['parameters']
        self.details = attrs['details']
        self.owner = attrs['owner']
        self
      end

      def to_hash_without_id
        {
          provider: provider,
          project: project,
          deploy_env: deploy_env,
          stack_template: stack_template,
          cloud_stack_id: cloud_stack_id,
          parameters: parameters,
          details: details,
          stack_status: stack_status,
          owner: owner
        }
      end

      def create_stack_in_cloud!
        begin
          self.cloud_stack_id = provider_class.create_stack(self)
        rescue ProviderErrors::NameConflict
          raise InvalidRecord.new "Duplicate key error: stack with name '#{id}' already exists in cloud"
        end
      end

      def delete_stack_in_cloud!
        provider_class.delete_stack(self)
      end

      def sync_details!
        self.details = provider_class.stack_details(self).attributes
      end

      def resources
        provider_class.stack_resources(self)
      end

      # resource_id is logical
      def resource(resource_id)
        provider_class.stack_resource(self, resource_id)
      end

      def stack_status
        raise 'override me'
      end

      def stack_statuses
        # maybe they differ in different providers, so use method instead of hardcoding
        {
          in_progress: 'CREATE_IN_PROGRESS',
          complete: 'CREATE_COMPLETE'
        }
      end

      def template_body
        Devops::Db.connector.stack_template(stack_template).template_body
      end

      class << self
        attr_accessor :provider

        # attrs should include:
        # - id (String)
        # - deploy_env (String)
        # - stack_template (String)
        def create(attrs)
          model = new(attrs)
          model.create_stack_in_cloud!
          model.sync_details!
          model
        end

        def build_from_bson(attrs)
          attrs['id'] = attrs["_id"]
          self.new(attrs)
        end
      end

      private

      def provider_class
        Provider::ProviderFactory.get(provider)
      end

    end
  end
end