module Travis::API::V3
  class Queries::Repositories < Query
    params :active, :private, :starred, prefix: :repository
    sortable_by :id, :github_id, :owner_name, :name, active: sort_condition(:active), :'default_branch.last_build' => 'builds.started_at', :current_build => "current_build.id %{order} NULLS LAST"

    def for_member(user, **options)
      all(user: user, **options).joins(:users).where(users: user_condition(user), invalidated_at: nil)
    end

    def for_owner(owner, **options)
      filter(owner.repositories, **options)
    end

    def all(**options)
      filter(Models::Repository, **options)
    end

    def filter(list, user: nil)
      list = list.where(invalidated_at: nil)
      list = list.where(active:  bool(active))  unless active.nil?
      list = list.where(private: bool(private)) unless private.nil?
      list = list.includes(:owner) if includes? 'repository.owner'.freeze

      if user and not starred.nil?
        if bool(starred)
          list = list.joins(:stars).where(stars: { user_id: user.id })
        elsif user.starred_repository_ids.any?
          list = list.where("repositories.id NOT IN (?)", user.starred_repository_ids)
        end
      end

      if includes? 'repository.last_build'.freeze or includes? 'build'.freeze
        list = list.includes(:last_build)
        list = list.includes(last_build: :commit) if includes? 'build.commit'.freeze
      end

      list = list.includes(default_branch: :last_build)
      list = list.includes(default_branch: { last_build: :commit }) if includes? 'build.commit'.freeze

      sort add_current_build list
    end

    # this will add SQL needed to fetch current_build along with the
    # repositories list. It will probably go away soon, once we test the current
    # build and use current_build_id column, just as we do with last_build for
    # branches
    def add_current_build(list)
      join = "
        LEFT OUTER JOIN builds as %{column_alias}
          ON %{column_alias}.repository_id = repositories.id AND
             %{column_alias}.event_type IN ('api', 'push', 'cron') AND
             %{column_alias}.state IN ('started', 'errored', 'passed', 'finished', 'canceled')"

      list = list.joins(join % { column_alias: 'current_build' })
      list = list.joins(join % { column_alias: 'older_builds'  }+ " AND current_build.id < older_builds.id")
      list = list.where("older_builds.id IS NULL")
      list.select("repositories.*, current_build.id as current_build_id")
    end
  end
end