# frozen_string_literal: true

class BillPlanCommand
	def self.for(customer)
		return ForUnregistered.new unless customer.registered?

		unless customer.balance > customer.monthly_price
			return ForLowBalance.new(customer)
		end

		new(customer)
	end

	def initialize(customer)
		@customer = customer
	end

	def call
		@customer.bill_plan
		Command.reply do |reply|
			reply.note_type = :info
			reply.note_text = "Customer billed"
		end
	end

	class ForLowBalance
		def initialize(customer)
			@customer = customer
		end

		def call
			LowBalance.for(@customer).then(&:notify!).then do |amount|
				return command_for(amount).call if amount&.positive?

				notify_failure
				Command.reply do |reply|
					reply.note_type = :error
					reply.note_text = "Customer balance is too low"
				end
			end
		end

	protected

		def notify_failure
			m = Blather::Stanza::Message.new
			m.from = CONFIG[:notify_from]
			m.body =
				"Failed to renew account for #{@customer.registered?.phone}. " \
				"To keep your number, please buy more credit soon."
			@customer.stanza_to(m)
		end

		def command_for(amount)
			BillPlanCommand.for(
				@customer.with_balance(@customer.balance + amount)
			)
		end
	end

	class ForUnregistered
		def call
			Command.reply do |reply|
				reply.note_type = :error
				reply.note_text = "Customer is not registered"
			end
		end
	end
end