module Streams
  # Catena effective cover: partita → squadra → società → default Match Live TV.
  class CoverResolver
    Result = Struct.new(:record, :source, :cover_url, :slate_local_path, keyword_init: true)

    DEFAULT_COVER_URL = "/images/copertina-canale.png".freeze

    def initialize(match)
      @match = match
      @team = match.team
      @club = @team.club
      @entitlements = @team.entitlements
    end

    def effective_cover_url
      resolve&.cover_url || default_cover_url
    end

    def cover_source
      resolve&.source || "default"
    end

    def resolve
      return nil unless @entitlements.can_use_custom_cover?

      candidates.each do |record, source|
        next unless record.cover_image.attached?
        next unless record.cover_slate.attached?

        path = CoverSlatePaths.local_path_for(record)
        next if path.blank?

        return Result.new(
          record: record,
          source: source,
          cover_url: blob_path(record.cover_image),
          slate_local_path: path
        )
      end

      nil
    end

    def default_cover_url
      DEFAULT_COVER_URL
    end

    def default_slate_path
      ENV.fetch("MEDIAMTX_SLATE_FILE", "/slates/offline.mp4")
    end

    private

    def candidates
      [
        [@match, "match"],
        [@team, "team"],
        [@club, "club"]
      ]
    end

    def blob_path(attachment)
      Rails.application.routes.url_helpers.rails_blob_path(attachment, only_path: true)
    end
  end
end