# frozen_string_literal: true

# Finder for obtaining the unique environment names of a project or group.
#
# This finder exists so that the merge requests "environments" filter can be
# populated with a unique list of environment names. If we retrieve _just_ the
# environments, duplicates may be present (e.g. multiple projects in a group
# having a "staging" environment).
#
# In addition, this finder only produces unfoldered environments. We do this
# because when searching for environments we want to exclude review app
# environments.
class EnvironmentNamesFinder
  attr_reader :project_or_group, :current_user

  def initialize(project_or_group, current_user)
    @project_or_group = project_or_group
    @current_user = current_user
  end

  def execute
    all_environments.unfoldered.order_by_name.pluck_unique_names
  end

  def all_environments
    if project_or_group.is_a?(Namespace)
      namespace_environments
    else
      project_environments
    end
  end

  def namespace_environments
    projects =
      project_or_group.all_projects.public_or_visible_to_user(current_user)

    Environment.for_project(projects)
  end

  def project_environments
    if current_user.can?(:read_environment, project_or_group)
      project_or_group.environments
    else
      Environment.none
    end
  end
end
