"""
mbed SDK
Copyright (c) 2011-2013 ARM Limited

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""

import re
import sys
import uuid
from sys import stdout
from host_test import DefaultTest
from socket import socket, AF_INET, SOCK_DGRAM


class UDPEchoServerTest(DefaultTest):
    ECHO_SERVER_ADDRESS = ""
    ECHO_PORT = 0
    s = None # Socket

    PATTERN_SERVER_IP = "Server IP Address is (\d+).(\d+).(\d+).(\d+):(\d+)"
    re_detect_server_ip = re.compile(PATTERN_SERVER_IP)

    def run(self):
        result = True
        serial_ip_msg = self.mbed.serial_readline()
        if serial_ip_msg is None:
            self.print_result(self.RESULT_IO_SERIAL)
            return
        self.notify(serial_ip_msg)
        # Searching for IP address and port prompted by server
        m = self.re_detect_server_ip.search(serial_ip_msg)
        if m and len(m.groups()):
            self.ECHO_SERVER_ADDRESS = ".".join(m.groups()[:4])
            self.ECHO_PORT = int(m.groups()[4]) # must be integer for socket.connect method
            self.notify("HOST: UDP Server found at: " + self.ECHO_SERVER_ADDRESS + ":" + str(self.ECHO_PORT))

            # We assume this test fails so can't send 'error' message to server
            try:
                self.s = socket(AF_INET, SOCK_DGRAM)
            except Exception, e:
                self.s = None
                print "HOST: Error: %s" % e
                self.print_result(self.RESULT_ERROR)
                exit(-1)

            for i in range(0, 100):
                TEST_STRING = str(uuid.uuid4())
                self.s.sendto(TEST_STRING, (self.ECHO_SERVER_ADDRESS, self.ECHO_PORT))
                data = self.s.recv(len(TEST_STRING))
                received_str = repr(data)[1:-1]
                if TEST_STRING != received_str:
                    result = False
                    break
                sys.stdout.write('.')
                stdout.flush()
        else:
            result = False

        if self.s is not None:
            self.s.close()

        self.print_result(self.RESULT_SUCCESS if result else self.RESULT_FAILURE)

        # Receiving
        try:
            while True:
                c = self.mbed.serial_read(512)
                if c is None:
                    self.print_result(self.RESULT_IO_SERIAL)
                    break
                stdout.write(c)
                stdout.flush()
        except KeyboardInterrupt, _:
            print "\n[CTRL+c] exit"


if __name__ == '__main__':
    UDPEchoServerTest().run()