# frozen_string_literal: true

require "pg/em/connection_pool"
require "bigdecimal"
require "blather/client/dsl" # Require this first to not auto-include
require "blather/client"
require "braintree"
require "date"
require "dhall"
require "em-hiredis"
require "em_promise"
require "ougai"
require "ruby-bandwidth-iris"
require "sentry-ruby"
require "statsd-instrument"

$stdout.sync = true
LOG = Ougai::Logger.new($stdout)
LOG.level = ENV.fetch("LOG_LEVEL", "info")
LOG.formatter = Ougai::Formatters::Readable.new(
	nil,
	nil,
	plain: !$stdout.isatty
)
LOG.info "Starting"

Sentry.init

CONFIG =
	Dhall::Coder
	.new(safe: Dhall::Coder::JSON_LIKE + [Symbol, Proc])
	.load(ARGV[0], transform_keys: ->(k) { k&.to_sym })

singleton_class.class_eval do
	include Blather::DSL
	Blather::DSL.append_features(self)
end

require_relative "lib/alt_top_up_form"
require_relative "lib/add_bitcoin_address"
require_relative "lib/backend_sgx"
require_relative "lib/bandwidth_tn_order"
require_relative "lib/btc_sell_prices"
require_relative "lib/buy_account_credit_form"
require_relative "lib/command_list"
require_relative "lib/customer"
require_relative "lib/electrum"
require_relative "lib/error_to_send"
require_relative "lib/em"
require_relative "lib/payment_methods"
require_relative "lib/registration"
require_relative "lib/transaction"
require_relative "lib/web_register_manager"
require_relative "lib/statsd"

ELECTRUM = Electrum.new(**CONFIG[:electrum])
EM::Hiredis::Client.load_scripts_from("./redis_lua")

Faraday.default_adapter = :em_synchrony
BandwidthIris::Client.global_options = {
	account_id: CONFIG[:creds][:account],
	username: CONFIG[:creds][:username],
	password: CONFIG[:creds][:password]
}

def new_sentry_hub(stanza, name: nil)
	hub = Sentry.get_current_hub&.new_from_top
	raise "Sentry.init has not been called" unless hub

	hub.push_scope
	hub.current_scope.clear_breadcrumbs
	hub.current_scope.set_transaction_name(name) if name
	hub.current_scope.set_user(jid: stanza.from.stripped.to_s)
	hub
end

# Braintree is not async, so wrap in EM.defer for now
class AsyncBraintree
	def initialize(environment:, merchant_id:, public_key:, private_key:, **)
		@gateway = Braintree::Gateway.new(
			environment: environment,
			merchant_id: merchant_id,
			public_key: public_key,
			private_key: private_key
		)
	end

	def respond_to_missing?(m, *)
		@gateway.respond_to?(m)
	end

	def method_missing(m, *args)
		return super unless respond_to_missing?(m, *args)

		EM.promise_defer(klass: PromiseChain) do
			@gateway.public_send(m, *args)
		end
	end

	class PromiseChain < EMPromise
		def respond_to_missing?(*)
			false # We don't actually know what we respond to...
		end

		def method_missing(m, *args)
			return super if respond_to_missing?(m, *args)
			self.then { |o| o.public_send(m, *args) }
		end
	end
end

BRAINTREE = AsyncBraintree.new(**CONFIG[:braintree])

def panic(e, hub=nil)
	LOG.fatal "Error raised during event loop: #{e.class}", e
	if e.is_a?(::Exception)
		(hub || Sentry).capture_exception(e, hint: { background: false })
	else
		(hub || Sentry).capture_message(e.to_s, hint: { background: false })
	end
	exit 1
end

EM.error_handler(&method(:panic))

when_ready do
	LOG.info "Ready"
	BLATHER = self
	REDIS = EM::Hiredis.connect
	BTC_SELL_PRICES = BTCSellPrices.new(REDIS, CONFIG[:oxr_app_id])
	DB = PG::EM::ConnectionPool.new(dbname: "jmp") do |conn|
		conn.type_map_for_results = PG::BasicTypeMapForResults.new(conn)
		conn.type_map_for_queries = PG::BasicTypeMapForQueries.new(conn)
	end

	EM.add_periodic_timer(3600) do
		ping = Blather::Stanza::Iq::Ping.new(:get, CONFIG[:server][:host])
		ping.from = CONFIG[:component][:jid]
		self << ping
	end
end

# workqueue_count MUST be 0 or else Blather uses threads!
setup(
	CONFIG[:component][:jid],
	CONFIG[:component][:secret],
	CONFIG[:server][:host],
	CONFIG[:server][:port],
	nil,
	nil,
	workqueue_count: 0
)

message to: /\Aaccount@/, body: /./ do |m|
	StatsD.increment("deprecated_account_bot")

	self << m.reply.tap do |out|
		out.body = "This bot is deprecated. Please talk to xmpp:cheogram.com"
	end
end

before(
	:iq,
	type: [:error, :result],
	to: /\Acustomer_/,
	from: /(\A|@)#{CONFIG[:sgx]}(\/|\Z)/
) { |iq| halt if IQ_MANAGER.fulfill(iq) }

before nil, to: /\Acustomer_/, from: /(\A|@)#{CONFIG[:sgx]}(\/|\Z)/ do |s|
	StatsD.increment("stanza_customer")

	sentry_hub = new_sentry_hub(s, name: "stanza_customer")
	Customer.for_customer_id(
		s.to.node.delete_prefix("customer_")
	).then { |customer|
		sentry_hub.current_scope.set_user(
			id: customer.customer_id,
			jid: s.from.stripped.to_s
		)
		customer.stanza_to(s)
	}.catch { |e| panic(e, sentry_hub) }
	halt
end

ADDRESSES_NS = "http://jabber.org/protocol/address"
message(
	to: /\A#{CONFIG[:component][:jid]}\Z/,
	from: /(\A|@)#{CONFIG[:sgx]}(\/|\Z)/
) do |m|
	StatsD.increment("inbound_group_text")
	sentry_hub = new_sentry_hub(m, name: "message")

	address = m.find("ns:addresses", ns: ADDRESSES_NS).first
		&.find("ns:address", ns: ADDRESSES_NS)
		&.find { |el| el["jid"].to_s.start_with?("customer_") }
	pass unless address

	Customer.for_customer_id(
		Blather::JID.new(address["jid"].to_s).node.delete_prefix("customer_")
	).then(&:jid).then { |customer_jid|
		m.from = m.from.with(domain: CONFIG[:component][:jid])
		m.to = m.to.with(domain: customer_jid.domain)
		address["jid"] = customer_jid.to_s
		BLATHER << m
	}.catch { |e| panic(e, sentry_hub) }
end

# Ignore groupchat messages
# Especially if we have the component join MUC for notifications
message(type: :groupchat) { true }

def billable_message(m)
	(m.body && !m.body.empty?) || m.find("ns:x", ns: OOB.registered_ns).first
end

message do |m|
	StatsD.increment("message")

	sentry_hub = new_sentry_hub(m, name: "message")
	today = Time.now.utc.to_date
	Customer.for_jid(m.from.stripped).then { |customer|
		sentry_hub.current_scope.set_user(
			id: customer.customer_id, jid: m.from.stripped.to_s
		)
		EMPromise.all([
			customer, (customer.incr_message_usage if billable_message(m)),
			REDIS.exists("jmp_usage_notify-#{customer.customer_id}"),
			customer.stanza_from(m)
		])
	}.then { |(customer, _, already, _)|
		next if already == 1

		customer.message_usage((today..(today - 30))).then do |usage|
			next unless usage > 500

			BLATHER.join(CONFIG[:notify_admin], "sgx-jmp")
			BLATHER.say(
				CONFIG[:notify_admin],
				"#{customer.customer_id} has used #{usage} messages since #{today - 30}",
				:groupchat
			)
			REDIS.set("jmp_usage_notify-#{customer.customer_id}", ex: 60 * 60 * 24)
		end
	}.catch { |e| panic(e, sentry_hub) }
end

message :error? do |m|
	StatsD.increment("message_error")

	LOG.error "MESSAGE ERROR", stanza: m
end

class SessionManager
	def initialize(blather, id_msg, timeout: 5, error_if: nil)
		@blather = blather
		@sessions = {}
		@id_msg = id_msg
		@timeout = timeout
		@error_if = error_if
	end

	def promise_for(stanza)
		id = "#{stanza.to.stripped}/#{stanza.public_send(@id_msg)}"
		@sessions.fetch(id) do
			@sessions[id] = EMPromise.new
			EM.add_timer(@timeout) do
				@sessions.delete(id)&.reject(:timeout)
			end
			@sessions[id]
		end
	end

	def write(stanza)
		promise = promise_for(stanza)
		@blather << stanza
		promise
	end

	def fulfill(stanza)
		id = "#{stanza.from.stripped}/#{stanza.public_send(@id_msg)}"
		if stanza.error? || @error_if&.call(stanza)
			@sessions.delete(id)&.reject(stanza)
		else
			@sessions.delete(id)&.fulfill(stanza)
		end
	end
end

IQ_MANAGER = SessionManager.new(self, :id)
COMMAND_MANAGER = SessionManager.new(
	self,
	:sessionid,
	timeout: 60 * 60,
	error_if: ->(s) { s.cancel? }
)
web_register_manager = WebRegisterManager.new

disco_info to: Blather::JID.new(CONFIG[:component][:jid]) do |iq|
	reply = iq.reply
	reply.identities = [{
		name: "JMP.chat",
		type: "sms",
		category: "gateway"
	}]
	reply.features = [
		"http://jabber.org/protocol/disco#info",
		"http://jabber.org/protocol/commands"
	]
	form = Blather::Stanza::X.find_or_create(reply.query)
	form.type = "result"
	form.fields = [
		{
			var: "FORM_TYPE",
			type: "hidden",
			value: "http://jabber.org/network/serverinfo"
		}
	] + CONFIG[:xep0157]
	self << reply
end

disco_info do |iq|
	reply = iq.reply
	reply.identities = [{
		name: "JMP.chat",
		type: "sms",
		category: "client"
	}]
	reply.features = [
		"urn:xmpp:receipts"
	]
	self << reply
end

disco_items node: "http://jabber.org/protocol/commands" do |iq|
	StatsD.increment("command_list")

	sentry_hub = new_sentry_hub(iq, name: iq.node)
	reply = iq.reply

	CommandList.for(iq.from.stripped).then { |list|
		reply.items = list.map do |item|
			Blather::Stanza::DiscoItems::Item.new(
				iq.to,
				item[:node],
				item[:name]
			)
		end
		self << reply
	}.catch { |e| panic(e, sentry_hub) }
end

iq "/iq/ns:services", ns: "urn:xmpp:extdisco:2" do |iq|
	StatsD.increment("extdisco")

	reply = iq.reply
	reply << Nokogiri::XML::Builder.new {
		services(xmlns: "urn:xmpp:extdisco:2") do
			service(
				type: "sip",
				host: CONFIG[:sip_host]
			)
		end
	}.doc.root

	self << reply
end

command :execute?, node: "jabber:iq:register", sessionid: nil do |iq|
	StatsD.increment("command", tags: ["node:#{iq.node}"])

	sentry_hub = new_sentry_hub(iq, name: iq.node)
	EMPromise.resolve(nil).then {
		Customer.for_jid(iq.from.stripped)
	}.catch {
		sentry_hub.add_breadcrumb(Sentry::Breadcrumb.new(
			message: "Customer.create"
		))
		Customer.create(iq.from.stripped)
	}.then { |customer|
		sentry_hub.current_scope.set_user(
			id: customer.customer_id,
			jid: iq.from.stripped.to_s
		)
		sentry_hub.add_breadcrumb(Sentry::Breadcrumb.new(
			message: "Registration.for"
		))
		Registration.for(
			iq,
			customer,
			web_register_manager
		).then(&:write).then { StatsD.increment("registration.completed") }
	}.catch_only(ErrorToSend) { |e|
		self << e.stanza
	}.catch { |e| panic(e, sentry_hub) }
end

def reply_with_note(iq, text, type: :info)
	reply = iq.reply
	reply.status = :completed
	reply.note_type = type
	reply.note_text = text

	self << reply
end

# Commands that just pass through to the SGX
command node: [
	"number-display",
	"configure-calls",
	"record-voicemail-greeting"
] do |iq|
	StatsD.increment("command", tags: ["node:#{iq.node}"])

	sentry_hub = new_sentry_hub(iq, name: iq.node)
	Customer.for_jid(iq.from.stripped).then { |customer|
		sentry_hub.current_scope.set_user(
			id: customer.customer_id,
			jid: iq.from.stripped.to_s
		)

		customer.stanza_from(iq)
	}.catch { |e| panic(e, sentry_hub) }
end

command :execute?, node: "credit cards", sessionid: nil do |iq|
	StatsD.increment("command", tags: ["node:#{iq.node}"])

	sentry_hub = new_sentry_hub(iq, name: iq.node)
	reply = iq.reply
	reply.status = :completed

	Customer.for_jid(iq.from.stripped).then { |customer|
		oob = OOB.find_or_create(reply.command)
		oob.url = CONFIG[:credit_card_url].call(
			reply.to.stripped.to_s.gsub("\\", "%5C"),
			customer.customer_id
		)
		oob.desc = "Manage credits cards and settings"

		reply.note_type = :info
		reply.note_text = "#{oob.desc}: #{oob.url}"

		self << reply
	}.catch { |e| panic(e, sentry_hub) }
end

command :execute?, node: "top up", sessionid: nil do |iq|
	StatsD.increment("command", tags: ["node:#{iq.node}"])

	sentry_hub = new_sentry_hub(iq, name: iq.node)
	reply = iq.reply
	reply.allowed_actions = [:complete]

	Customer.for_jid(iq.from.stripped).then { |customer|
		BuyAccountCreditForm.for(customer).then do |credit_form|
			credit_form.add_to_form(reply.form)
			COMMAND_MANAGER.write(reply).then { |iq2| [customer, credit_form, iq2] }
		end
	}.then { |(customer, credit_form, iq2)|
		iq = iq2 # This allows the catch to use it also
		Transaction.sale(customer, **credit_form.parse(iq2.form))
	}.then { |transaction|
		transaction.insert.then do
			reply_with_note(iq, "#{transaction} added to your account balance.")
		end
	}.catch_only(BuyAccountCreditForm::AmountValidationError) { |e|
		reply_with_note(iq, e.message, type: :error)
	}.catch { |e|
		sentry_hub.capture_exception(e)
		text = "Failed to buy credit, system said: #{e.message}"
		reply_with_note(iq, text, type: :error)
	}.catch { |e| panic(e, sentry_hub) }
end

command :execute?, node: "alt top up", sessionid: nil do |iq|
	StatsD.increment("command", tags: ["node:#{iq.node}"])

	sentry_hub = new_sentry_hub(iq, name: iq.node)
	reply = iq.reply
	reply.status = :executing
	reply.allowed_actions = [:complete]

	Customer.for_jid(iq.from.stripped).then { |customer|
		sentry_hub.current_scope.set_user(
			id: customer.customer_id,
			jid: iq.from.stripped.to_s
		)

		EMPromise.all([AltTopUpForm.for(customer), customer])
	}.then { |(alt_form, customer)|
		reply.command << alt_form.form

		COMMAND_MANAGER.write(reply).then do |iq2|
			AddBitcoinAddress.for(iq2, alt_form, customer).write
		end
	}.catch { |e| panic(e, sentry_hub) }
end

command :execute?, node: "reset sip account", sessionid: nil do |iq|
	StatsD.increment("command", tags: ["node:#{iq.node}"])

	sentry_hub = new_sentry_hub(iq, name: iq.node)
	Customer.for_jid(iq.from.stripped).then { |customer|
		sentry_hub.current_scope.set_user(
			id: customer.customer_id,
			jid: iq.from.stripped.to_s
		)
		customer.reset_sip_account
	}.then { |sip_account|
		reply = iq.reply
		reply.command << sip_account.form
		BLATHER << reply
	}.catch { |e| panic(e, sentry_hub) }
end

command :execute?, node: "usage", sessionid: nil do |iq|
	StatsD.increment("command", tags: ["node:#{iq.node}"])

	sentry_hub = new_sentry_hub(iq, name: iq.node)
	report_for = (Date.today..(Date.today << 1))

	Customer.for_jid(iq.from.stripped).then { |customer|
		sentry_hub.current_scope.set_user(
			id: customer.customer_id,
			jid: iq.from.stripped.to_s
		)

		customer.usage_report(report_for)
	}.then { |usage_report|
		reply = iq.reply
		reply.status = :completed
		reply.command << usage_report.form
		BLATHER << reply
	}.catch { |e| panic(e, sentry_hub) }
end

command :execute?, node: "web-register", sessionid: nil do |iq|
	StatsD.increment("command", tags: ["node:#{iq.node}"])

	sentry_hub = new_sentry_hub(iq, name: iq.node)

	begin
		jid = iq.form.field("jid")&.value.to_s.strip
		tel = iq.form.field("tel")&.value.to_s.strip
		sentry_hub.current_scope.set_user(jid: jid, tel: tel)
		if iq.from.stripped != CONFIG[:web_register][:from]
			BLATHER << iq.as_error("forbidden", :auth)
		elsif jid == "" || tel !~ /\A\+\d+\Z/
			reply_with_note(iq, "Invalid JID or telephone number.", type: :error)
		else
			IQ_MANAGER.write(Blather::Stanza::Iq::Command.new.tap { |cmd|
				cmd.to = CONFIG[:web_register][:to]
				cmd.node = "push-register"
				cmd.form.fields = [var: "to", value: jid]
				cmd.form.type = "submit"
			}).then { |result|
				final_jid = result.form.field("from")&.value.to_s.strip
				web_register_manager[final_jid] = tel
				BLATHER << iq.reply.tap { |reply| reply.status = :completed }
			}.catch { |e| panic(e, sentry_hub) }
		end
	rescue StandardError => e
		sentry_hub.capture_exception(e)
	end
end

command sessionid: /./ do |iq|
	COMMAND_MANAGER.fulfill(iq)
end

iq type: [:result, :error] do |iq|
	IQ_MANAGER.fulfill(iq)
end

iq type: [:get, :set] do |iq|
	StatsD.increment("unknown_iq")

	self << Blather::StanzaError.new(iq, "feature-not-implemented", :cancel)
end