# frozen_string_literal: true

require "bigdecimal"

class Transaction
	def self.sale(customer, amount:, payment_method: nil)
		REDIS.get("jmp_pay_decline-#{customer.customer_id}").then do |declines|
			raise "too many declines" if declines.to_i >= 2

			BRAINTREE.transaction.sale(
				amount: amount,
				**sale_args_for(customer, payment_method)
			).then do |response|
				decline_guard(customer, response)
				new(response.transaction)
			end
		end
	end

	def self.decline_guard(customer, response)
		return if response.success?

		REDIS.incr("jmp_pay_decline-#{customer.customer_id}").then do
			REDIS.expire("jmp_pay_decline-#{customer.customer_id}", 60 * 60 * 24)
		end
		raise response.message
	end

	def self.sale_args_for(customer, payment_method=nil)
		{
			merchant_account_id: customer.merchant_account,
			options: { submit_for_settlement: true }
		}.merge(
			if payment_method
				{ payment_method_token: payment_method.token }
			else
				{ customer_id: customer.customer_id }
			end
		)
	end

	attr_reader :amount

	def initialize(braintree_transaction)
		@customer_id = braintree_transaction.customer_details.id
		@transaction_id = braintree_transaction.id
		@created_at = braintree_transaction.created_at
		@amount = BigDecimal(braintree_transaction.amount, 4)
	end

	def insert
		EM.promise_fiber do
			DB.transaction do
				insert_tx
				insert_bonus
			end
		end
	end

	def bonus
		return BigDecimal(0) if amount <= 15
		amount *
			case amount
			when (15..29.99)
				0.01
			when (30..139.99)
				0.03
			else
				0.05
			end
	end

	def to_s
		plus = " + #{'%.4f' % bonus} bonus"
		"$#{'%.2f' % amount}#{plus if bonus.positive?}"
	end

protected

	def insert_tx
		params = [@customer_id, @transaction_id, @created_at, @amount]
		DB.exec(<<~SQL, params)
			INSERT INTO transactions
				(customer_id, transaction_id, created_at, amount, note)
			VALUES
				($1, $2, $3, $4, 'Credit card payment')
		SQL
	end

	def insert_bonus
		return if bonus <= 0
		params = [@customer_id, "bonus_for_#{@transaction_id}", @created_at, bonus]
		DB.exec(<<~SQL, params)
			INSERT INTO transactions
				(customer_id, transaction_id, created_at, amount, note)
			VALUES
				($1, $2, $3, $4, 'Credit card payment bonus')
		SQL
	end
end