class ProjectsFinder
  def execute(current_user, options)
    group = options[:group]

    if group
      group_projects(current_user, group)
    else
      all_projects(current_user)
    end
  end

  private

  def group_projects(current_user, group)
    if current_user
      if group.users.include?(current_user)
        # User is group member
        #
        # Return ALL group projects
        group.projects
      else
        projects_members = UsersProject.where(
          project_id: group.projects,
          user_id: current_user
        )

        if projects_members.any?
          # User is a project member
          #
          # Return only:
          #   public projects
          #   internal projects
          #   joined projects
          #
          group.projects.where(
            "projects.id IN (?) OR projects.visibility_level IN (?)",
            projects_members.pluck(:project_id),
            Project.public_and_internal_levels
          )
        else
          # User has no access to group or group projects
          #
          # Return only:
          #   public projects
          #   internal projects
          #
          group.projects.public_and_internal_only
        end
      end
    else
      # Not authenticated
      #
      # Return only:
      #   public projects
      group.projects.public_only
    end
  end

  def all_projects
    # TODO: implement
    raise 'Not implemented yet'
  end
end