# frozen_string_literal: true

module Chat
  module Service
    # Service responsible for updating a chat channel status.
    #
    # @example
    #  Chat::Service::UpdateChannelStatus.call(channel_id: 2, guardian: guardian, status: "open")
    #
    class UpdateChannelStatus
      include Base

      # @!method call(channel_id:, guardian:, status:)
      #   @param [Integer] channel_id
      #   @param [Guardian] guardian
      #   @param [String] status
      #   @return [Chat::Service::Base::Context]

      model :channel, :fetch_channel
      contract
      policy :check_channel_permission
      step :change_status

      # @!visibility private
      class Contract
        attribute :status
        validates :status, inclusion: { in: ChatChannel.editable_statuses.keys }
      end

      private

      def fetch_channel(channel_id:, **)
        ChatChannel.find_by(id: channel_id)
      end

      def check_channel_permission(guardian:, channel:, status:, **)
        guardian.can_preview_chat_channel?(channel) &&
          guardian.can_change_channel_status?(channel, status.to_sym)
      end

      def change_status(channel:, status:, guardian:, **)
        channel.public_send("#{status}!", guardian.user)
      end
    end
  end
end