module SvelteOnRails
  class ActionCable
    def self.dispatch(component = nil, event_detail = nil, event: 'stream-action', selector: nil, channel: nil)

      utils = SvelteOnRails::Lib::Utils
      conf = SvelteOnRails::Configuration.instance

      _comp = if component
                utils.validate_filename(component)
                "/#{conf.components_folder + component}"
              end

      _channel = require_channel(svelte_on_rails_configs['channel'] || channel)

      if event != 'stream-action' && !selector
        raise "Another event name than the default one is only possible together with a selector"
      end

      args = {
        eventDetail: event_detail,
        component: _comp,
        event: event,
        selector: selector
      }

      ::ActionCable.server.broadcast(
        _channel,
        args
      )

    end

    def self.dispatch_by_selector(selector, event_detail = nil, event: 'stream-action', channel: nil)

      _channel = require_channel(svelte_on_rails_configs['channel'] || channel)

      if event != 'stream-action' && !selector
        raise "Another event name than the default one is only possible together with a selector"
      end

      args = {
        eventDetail: event_detail,
        component: ':false:',
        event: event,
        selector: selector
      }

      ::ActionCable.server.broadcast(
        _channel,
        args
      )

    end

    private

    def self.svelte_on_rails_configs
      cnf = SvelteOnRails::Configuration.instance.configs[:action_cable]
      raise 'ActionCable not configured for SvelteOnRails' if cnf.nil?
      cnf
    end

    def self.require_channel(channel)
      unless channel.present?
        raise 'Missing attribute or configuration: action_cable/channel'
      end
      channel
    end

  end
end