# frozen_string_literal: true

module GoogleCloud
  DEFAULT_REGION = 'us-east1'

  class CreateCloudsqlInstanceService < ::GoogleCloud::BaseService
    WORKER_INTERVAL = 30.seconds

    def execute
      create_cloud_instance
      trigger_instance_setup_worker
      success
    rescue Google::Apis::Error => err
      error(err.message)
    end

    private

    def create_cloud_instance
      google_api_client.create_cloudsql_instance(gcp_project_id,
                                                 instance_name,
                                                 root_password,
                                                 database_version,
                                                 region,
                                                 tier)
    end

    def trigger_instance_setup_worker
      GoogleCloud::CreateCloudsqlInstanceWorker.perform_in(WORKER_INTERVAL,
                                                           current_user.id,
                                                           project.id,
                                                           {
                                                             'google_oauth2_token': google_oauth2_token,
                                                             'gcp_project_id': gcp_project_id,
                                                             'instance_name': instance_name,
                                                             'database_version': database_version,
                                                             'environment_name': environment_name,
                                                             'is_protected': protected?
                                                           })
    end

    def protected?
      project.protected_for?(environment_name)
    end

    def instance_name
      # Generates an `instance_name` for the to-be-created Cloud SQL instance
      # Example: `gitlab-34647-postgres-14-staging`
      environment_alias = environment_name == '*' ? 'ALL' : environment_name
      name = "gitlab-#{project.id}-#{database_version}-#{environment_alias}"
      name.tr("_", "-").downcase
    end

    def root_password
      SecureRandom.hex(16)
    end

    def database_version
      params[:database_version]
    end

    def region
      region = ::Ci::VariablesFinder
                 .new(project, { key: Projects::GoogleCloud::GcpRegionsController::GCP_REGION_CI_VAR_KEY,
                                 environment_scope: environment_name })
                 .execute.first
      region&.value || DEFAULT_REGION
    end

    def tier
      params[:tier]
    end
  end
end