# frozen_string_literal: true

module Mozo
  module Broadcaster
    # Drop-in replacement for Mozo::Broadcaster::Faye that uses
    # Rails' built-in ActionCable instead of an external Faye process.
    #
    # Benefits over Faye:
    #   - Async by default (ActionCable.server.broadcast is non-blocking)
    #   - No extra gem / process / port to manage
    #   - Integrated with Rails authentication (cookies, sessions)
    #   - WebSocket native (no long-polling fallback needed with modern browsers)
    #
    # Channel naming: accepts both Faye format and underscore format:
    #   /user/123 or /user_123  →  user_123
    #   /supplier/456  or /supplier_456  →  supplier_456
    #
    # To use:
    #   Set Mozo.broadcaster = Mozo::Broadcaster::ActionCable.new
    #   in config/initializers/mozo_settings.rb
    #
    class ActionCable
      CHANNEL_PREFIX_REMAP = {
        %r{^/user[/_](.+)$}     => 'user_\1',
        %r{^/supplier[/_](.+)$} => 'supplier_\1'
      }.freeze

      def broadcast(message)
        channel = message[:channel] || message['channel']
        data    = message[:data]    || message['data']

        remapped = remap_channel(channel)
        unless remapped
          Rails.logger.warn("[ACTION_CABLE] broadcast skipped: unknown channel #{channel}")
          return
        end

        Rails.logger.debug("[ACTION_CABLE] broadcasting to #{remapped}: #{data.inspect}")
        ::ActionCable.server.broadcast(remapped, data)
      rescue => e
        Rails.logger.error("[ACTION_CABLE][ERROR] #{e.message}")
      end

      private

      def remap_channel(channel)
        CHANNEL_PREFIX_REMAP.each do |pattern, replacement|
          return channel.sub(pattern, replacement) if channel.match?(pattern)
        end
        Rails.logger.warn("[ACTION_CABLE] Unknown channel format: #{channel}")
        nil
      end
    end
  end
end