require 'db/mongo/models/stack_template/stack_template_factory'
require "app/api2/parsers/stack_template"
require_relative "request_handler"

module Devops
  module API2_0
    module Handler
      class StackTemplate < RequestHandler

        set_parser Devops::API2_0::Parser::StackTemplateParser

        def stack_templates
          Devops::Db.connector.stack_templates
        end

        def stack_templates_for_provider provider
          Devops::Db.connector.stack_templates(provider)
        end

        def create_stack_template provider
          body = parser.create
          template_model = Model::StackTemplateFactory.create(provider, body)
          template_model.owner = parser.current_user
          Devops::Db.connector.stack_template_insert(template_model)
          template_model
        end

        def get_stack_template id
          Devops::Db.connector.stack_template(id)
        end

        def delete_stack_template id
          envs_with_this_template = envs_using_stack_template(id)

          if envs_with_this_template.empty?
            Devops::Db.connector.stack_template_delete id
          else
            raise ConflictException.new("Stack template '#{id}' is already in use in #{envs_with_this_template.map{|project, envs| "#{project}: #{envs.join(', ')}"}.join('; ')}", {projects: envs_with_this_template})
          end
        end

        private

        # returns:
        # {
        #   "project" => ["deploy_env"]
        # }
        def envs_using_stack_template(id)
          projects = Devops::Db.connector.projects_and_deploy_envs_by_field('stack_template', id)
          envs_with_this_template = []
          res = {}

          projects.each do |project|
            array = []
            res[project.id] = array
            project.deploy_envs.each do |env|
              array << env.identifier
            end
          end
          res
        end

      end
    end
  end
end