require "db/mongo/models/model_with_provider"
require "providers/exceptions/name_conflict"

module Devops
  module Model
    class StackBase < MongoModel

      include ModelWithProvider

      attr_accessor :id, :name, :project, :deploy_env, :stack_template, :parameters, :details, :owner, :run_list

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

      def initialize attrs={}
#        self.provider = self.class.provider
        self.set_provider(attrs)
        self.id = attrs['id']
        self.project = attrs['project']
        self.deploy_env = attrs['deploy_env']
        self.stack_template = attrs['stack_template']
        self.name = attrs['name']
        self.parameters = attrs['parameters']
        self.details = attrs['details']
        self.owner = attrs['owner']
        self.run_list = attrs['run_list'] || []
        self
      end

      def to_hash_without_id
        {
          project: project,
          deploy_env: deploy_env,
          stack_template: stack_template,
          name: name,
          parameters: parameters,
          # details are required to proper status handling
          details: bson_safe_details,
          stack_status: stack_status,
          owner: owner
        }.merge(provider_hash)
      end

      # overrided in ec2
      def bson_safe_details
        details
      end

      def create_stack_in_cloud! out
        begin
          provider_instance.create_stack(self, out)
        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_instance.delete_stack(self)
      end

      def sync_details!
        self.details = provider_instance.stack_details(self)
      end

      def resources
        provider_instance.stack_resources(self)
      end

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

      # there is only one way to update stack status right now:
      #     stack.sync_details!
      #     mongo.stack_update(stack)
      # It's because syncing updates @details instance variable, but doesn'not persist it.
      # Also that's why we need to have "details" key in #to_mongo_hash
      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

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

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

    end
  end
end