require "../../requests/*"

class DNSManager::Client < IPC
	property server_fd : Int32 = -1

	def initialize
		super()
		fd = self.connect "dnsmanager"
		if fd.nil?
			raise "couldn't connect to 'auth' IPC service"
		end
		@server_fd = fd
	end

	#
	# Simple users.
	#

	def login(token : String)
		request = Request::Login.new token
		send_now request
		parse_message [ Response::Success ], read
	end

	#
	# Domain operations
	#

	# Add a domain.
	def user_domain_add(domain : String)
		request = Request::NewDomain.new domain
		send_now request
		parse_message [ Response::Success ], read
	end

	# Remove a domain.
	def user_domain_del(domain : String)
		request = Request::DeleteDomain.new domain
		send_now request
		parse_message [ Response::Success ], read
	end

	# Get user domain list.
	def user_domain_list()
		request = Request::UserDomains.new
		send_now request
		parse_message [ Response::DomainList ], read
	end

	#
	# Zone operations
	#

	# Add a full zone.
	def user_zone_add(zone : Storage::Zone)
		request = Request::AddOrUpdateZone.new zone
		send_now request
		parse_message [ Response::Success ], read
	end

	# Get a zone.
	def user_zone_get(domain : String)
		request = Request::GetZone.new domain
		send_now request
		parse_message [ Response::Zone ], read
	end

	#
	# Resource Record operations
	#

	# Add a RR.
	def user_rr_add(domain : String, rr : Storage::Zone::ResourceRecord)
		request = Request::AddRR.new domain, rr
		send_now request
		parse_message [ Response::Success ], read
	end

	# Update a RR.
	def user_rr_update(domain : String, rr : Storage::Zone::ResourceRecord)
		request = Request::UpdateRR.new domain, rr
		send_now request
		parse_message [ Response::Success ], read
	end

	# Delete a RR.
	def user_rr_delete(domain : String, rr : UInt32)
		request = Request::DeleteRR.new domain, rr
		send_now request
		parse_message [ Response::Success ], read
	end

	#
	# Admin stuff
	#

	def admin_maintenance(subject : Request::Maintenance::Subject, value : Int32? = nil)
		request = Request::Maintenance.new(subject)
		if value
			request.value = value
		end
		send_now request
		parse_message [ Response::Success ], read
	end

	#
	# Utils
	#

	def send_now(msg : IPC::JSON)
		m = IPCMessage::TypedMessage.new msg.type.to_u8, msg.to_json
		write @server_fd, m
	end

	def send_now(type : Request::Type, payload)
		m = IPCMessage::TypedMessage.new type.value.to_u8, payload
		write @server_fd, m
	end

	def read
		slice = self.read @server_fd
		m = IPCMessage::TypedMessage.deserialize slice
		m.not_nil!
	end

	# TODO: parse_message should raise exception if response not anticipated
	def parse_message(expected_messages, message)
		em = Array(IPC::JSON.class).new
		expected_messages.each do |e|
			em << e
		end
		em << Response::Error
		em.parse_ipc_json message
	end
end