# frozen_string_literal: true

require "forwardable"

require_relative "./blather_ext"
require_relative "./customer_plan"
require_relative "./customer_usage"
require_relative "./backend_sgx"
require_relative "./ibr"
require_relative "./payment_methods"
require_relative "./plan"

class Customer
	def self.for_jid(jid)
		REDIS.get("jmp_customer_id-#{jid}").then do |customer_id|
			raise "No customer id" unless customer_id
			for_customer_id(customer_id)
		end
	end

	def self.for_customer_id(customer_id)
		result = DB.query_defer(<<~SQL, [customer_id])
			SELECT COALESCE(balance,0) AS balance, plan_name, expires_at
			FROM customer_plans LEFT JOIN balances USING (customer_id)
			WHERE customer_id=$1 LIMIT 1
		SQL
		result.then do |rows|
			new(customer_id, **rows.first&.transform_keys(&:to_sym) || {})
		end
	end

	def self.create(jid)
		BRAINTREE.customer.create.then do |result|
			raise "Braintree customer create failed" unless result.success?
			cid = result.customer.id
			REDIS.msetnx(
				"jmp_customer_id-#{jid}", cid, "jmp_customer_jid-#{cid}", jid
			).then do |redis_result|
				raise "Saving new customer to redis failed" unless redis_result == 1
				new(cid)
			end
		end
	end

	extend Forwardable

	attr_reader :customer_id, :balance
	def_delegators :@plan, :active?, :activate_plan_starting_now, :bill_plan,
	               :currency, :merchant_account, :plan_name
	def_delegators :@sgx, :register!, :registered?
	def_delegator :@usage, :report, :usage_report

	def initialize(
		customer_id,
		plan_name: nil,
		expires_at: Time.now,
		balance: BigDecimal.new(0),
		sgx: BackendSgx.new(customer_id)
	)
		@plan = CustomerPlan.new(
			customer_id,
			plan: plan_name && Plan.for(plan_name),
			expires_at: expires_at
		)
		@usage = CustomerUsage.new(customer_id)
		@customer_id = customer_id
		@balance = balance
		@sgx = sgx
	end

	def with_plan(plan_name)
		self.class.new(
			@customer_id,
			balance: @balance,
			expires_at: expires_at,
			plan_name: plan_name
		)
	end

	def payment_methods
		BRAINTREE
			.customer
			.find(@customer_id)
			.then(PaymentMethods.method(:for_braintree_customer))
	end

	def jid
		@jid ||= REDIS.get("jmp_customer_jid-#{customer_id}").then do |sjid|
			Blather::JID.new(sjid)
		end
	end

	def stanza_to(stanza)
		jid.then do |jid|
			stanza = stanza.dup
			stanza.to = jid.with(resource: stanza.to&.resource)
			stanza.from = stanza.from.with(domain: CONFIG[:component][:jid])
			BLATHER << stanza
		end
	end

	def stanza_from(stanza)
		BLATHER << @sgx.stanza(stanza)
	end

	protected def_delegator :@plan, :expires_at
end