import multiprocessing
import os
import re
import socket
import ssl
import struct

from tiny_test_fw import DUT
import ttfw_idf
import random
import subprocess

try:
    import BaseHTTPServer
    from SimpleHTTPServer import SimpleHTTPRequestHandler
except ImportError:
    import http.server as BaseHTTPServer
    from http.server import SimpleHTTPRequestHandler

server_file = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'test_certs/server_cert.pem')
key_file = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'test_certs/server_key.pem')


def get_my_ip():
    s1 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    s1.connect(("8.8.8.8", 80))
    my_ip = s1.getsockname()[0]
    s1.close()
    return my_ip


def get_server_status(host_ip, port):
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server_status = sock.connect_ex((host_ip, port))
    sock.close()
    if server_status == 0:
        return True
    return False


def https_request_handler():
    """
    Returns a request handler class that handles broken pipe exception
    """
    class RequestHandler(SimpleHTTPRequestHandler):
        def finish(self):
            try:
                if not self.wfile.closed:
                    self.wfile.flush()
                    self.wfile.close()
            except socket.error:
                pass
            self.rfile.close()

        def handle(self):
            try:
                BaseHTTPServer.BaseHTTPRequestHandler.handle(self)
            except socket.error:
                pass

    return RequestHandler


def start_https_server(ota_image_dir, server_ip, server_port):
    os.chdir(ota_image_dir)
    requestHandler = https_request_handler()
    httpd = BaseHTTPServer.HTTPServer((server_ip, server_port), requestHandler)

    httpd.socket = ssl.wrap_socket(httpd.socket,
                                   keyfile=key_file,
                                   certfile=server_file, server_side=True)
    httpd.serve_forever()


def start_chunked_server(ota_image_dir, server_port):
    os.chdir(ota_image_dir)
    chunked_server = subprocess.Popen(['openssl', 's_server', '-WWW', '-key', key_file, '-cert', server_file, '-port', str(server_port)])
    return chunked_server


def redirect_handler_factory(url):
    """
    Returns a request handler class that redirects to supplied `url`
    """
    class RedirectHandler(SimpleHTTPRequestHandler):
        def do_GET(self):
            print("Sending resp, URL: " + url)
            self.send_response(301)
            self.send_header('Location', url)
            self.end_headers()

    return RedirectHandler


def start_redirect_server(ota_image_dir, server_ip, server_port, redirection_port):
    os.chdir(ota_image_dir)
    redirectHandler = redirect_handler_factory('https://' + server_ip + ':' + str(redirection_port) + '/advanced_https_ota.bin')

    httpd = BaseHTTPServer.HTTPServer((server_ip, server_port),
                                      redirectHandler)

    httpd.socket = ssl.wrap_socket(httpd.socket,
                                   keyfile=key_file,
                                   certfile=server_file, server_side=True)
    httpd.serve_forever()


@ttfw_idf.idf_example_test(env_tag="Example_WIFI")
def test_examples_protocol_advanced_https_ota_example(env, extra_data):
    """
    This is a positive test case, which downloads complete binary file multiple number of times.
    Number of iterations can be specified in variable iterations.
    steps: |
      1. join AP
      2. Fetch OTA image over HTTPS
      3. Reboot with the new OTA image
    """
    dut1 = env.get_dut("advanced_https_ota_example", "examples/system/ota/advanced_https_ota", dut_class=ttfw_idf.ESP32DUT)
    # Number of iterations to validate OTA
    iterations = 3
    server_port = 8001
    # File to be downloaded. This file is generated after compilation
    bin_name = "advanced_https_ota.bin"
    # check and log bin size
    binary_file = os.path.join(dut1.app.binary_path, bin_name)
    bin_size = os.path.getsize(binary_file)
    ttfw_idf.log_performance("advanced_https_ota_bin_size", "{}KB".format(bin_size // 1024))
    ttfw_idf.check_performance("advanced_https_ota_bin_size", bin_size // 1024)
    # start test
    host_ip = get_my_ip()
    if (get_server_status(host_ip, server_port) is False):
        thread1 = multiprocessing.Process(target=start_https_server, args=(dut1.app.binary_path, host_ip, server_port))
        thread1.daemon = True
        thread1.start()
    dut1.start_app()
    for i in range(iterations):
        dut1.expect("Loaded app from partition at offset", timeout=30)
        try:
            ip_address = dut1.expect(re.compile(r" sta ip: ([^,]+),"), timeout=30)
            print("Connected to AP with IP: {}".format(ip_address))
        except DUT.ExpectTimeout:
            raise ValueError('ENV_TEST_FAILURE: Cannot connect to AP')
            thread1.terminate()
        dut1.expect('Starting Advanced OTA example', timeout=30)

        print("writing to device: {}".format("https://" + host_ip + ":" + str(server_port) + "/" + bin_name))
        dut1.write("https://" + host_ip + ":" + str(server_port) + "/" + bin_name)
        dut1.expect("Loaded app from partition at offset", timeout=60)
        dut1.expect("Starting Advanced OTA example", timeout=30)
        dut1.reset()
    thread1.terminate()


@ttfw_idf.idf_example_test(env_tag="Example_WIFI")
def test_examples_protocol_advanced_https_ota_example_truncated_bin(env, extra_data):
    """
    Working of OTA if binary file is truncated is validated in this test case.
    Application should return with error message in this case.
    steps: |
      1. join AP
      2. Generate truncated binary file
      3. Fetch OTA image over HTTPS
      4. Check working of code if bin is truncated
    """
    dut1 = env.get_dut("advanced_https_ota_example", "examples/system/ota/advanced_https_ota", dut_class=ttfw_idf.ESP32DUT)
    server_port = 8001
    # Original binary file generated after compilation
    bin_name = "advanced_https_ota.bin"
    # Truncated binary file to be generated from original binary file
    truncated_bin_name = "truncated.bin"
    # Size of truncated file to be grnerated. This value can range from 288 bytes (Image header size) to size of original binary file
    # truncated_bin_size is set to 64000 to reduce consumed by the test case
    truncated_bin_size = 64000
    # check and log bin size
    binary_file = os.path.join(dut1.app.binary_path, bin_name)
    f = open(binary_file, "rb+")
    fo = open(os.path.join(dut1.app.binary_path, truncated_bin_name), "wb+")
    fo.write(f.read(truncated_bin_size))
    fo.close()
    f.close()
    binary_file = os.path.join(dut1.app.binary_path, truncated_bin_name)
    bin_size = os.path.getsize(binary_file)
    ttfw_idf.log_performance("advanced_https_ota_bin_size", "{}KB".format(bin_size // 1024))
    ttfw_idf.check_performance("advanced_https_ota_bin_size", bin_size // 1024)
    # start test
    host_ip = get_my_ip()
    if (get_server_status(host_ip, server_port) is False):
        thread1 = multiprocessing.Process(target=start_https_server, args=(dut1.app.binary_path, host_ip, server_port))
        thread1.daemon = True
        thread1.start()
    dut1.start_app()
    dut1.expect("Loaded app from partition at offset", timeout=30)
    try:
        ip_address = dut1.expect(re.compile(r" sta ip: ([^,]+),"), timeout=30)
        print("Connected to AP with IP: {}".format(ip_address))
    except DUT.ExpectTimeout:
        raise ValueError('ENV_TEST_FAILURE: Cannot connect to AP')
        thread1.terminate()
    dut1.expect('Starting Advanced OTA example', timeout=30)

    print("writing to device: {}".format("https://" + host_ip + ":" + str(server_port) + "/" + truncated_bin_name))
    dut1.write("https://" + host_ip + ":" + str(server_port) + "/" + truncated_bin_name)
    dut1.expect("Image validation failed, image is corrupted", timeout=30)
    os.remove(binary_file)
    thread1.terminate()


@ttfw_idf.idf_example_test(env_tag="Example_WIFI")
def test_examples_protocol_advanced_https_ota_example_truncated_header(env, extra_data):
    """
    Working of OTA if headers of binary file are truncated is vaildated in this test case.
    Application should return with error message in this case.
    steps: |
      1. join AP
      2. Generate binary file with truncated headers
      3. Fetch OTA image over HTTPS
      4. Check working of code if headers are not sent completely
    """
    dut1 = env.get_dut("advanced_https_ota_example", "examples/system/ota/advanced_https_ota", dut_class=ttfw_idf.ESP32DUT)
    server_port = 8001
    # Original binary file generated after compilation
    bin_name = "advanced_https_ota.bin"
    # Truncated binary file to be generated from original binary file
    truncated_bin_name = "truncated_header.bin"
    # Size of truncated file to be grnerated. This value should be less than 288 bytes (Image header size)
    truncated_bin_size = 180
    # check and log bin size
    binary_file = os.path.join(dut1.app.binary_path, bin_name)
    f = open(binary_file, "rb+")
    fo = open(os.path.join(dut1.app.binary_path, truncated_bin_name), "wb+")
    fo.write(f.read(truncated_bin_size))
    fo.close()
    f.close()
    binary_file = os.path.join(dut1.app.binary_path, truncated_bin_name)
    bin_size = os.path.getsize(binary_file)
    ttfw_idf.log_performance("advanced_https_ota_bin_size", "{}KB".format(bin_size // 1024))
    ttfw_idf.check_performance("advanced_https_ota_bin_size", bin_size // 1024)
    # start test
    host_ip = get_my_ip()
    if (get_server_status(host_ip, server_port) is False):
        thread1 = multiprocessing.Process(target=start_https_server, args=(dut1.app.binary_path, host_ip, server_port))
        thread1.daemon = True
        thread1.start()
    dut1.start_app()
    dut1.expect("Loaded app from partition at offset", timeout=30)
    try:
        ip_address = dut1.expect(re.compile(r" sta ip: ([^,]+),"), timeout=30)
        print("Connected to AP with IP: {}".format(ip_address))
    except DUT.ExpectTimeout:
        raise ValueError('ENV_TEST_FAILURE: Cannot connect to AP')
        thread1.terminate()
    dut1.expect('Starting Advanced OTA example', timeout=30)

    print("writing to device: {}".format("https://" + host_ip + ":" + str(server_port) + "/" + truncated_bin_name))
    dut1.write("https://" + host_ip + ":" + str(server_port) + "/" + truncated_bin_name)
    dut1.expect("advanced_https_ota_example: esp_https_ota_read_img_desc failed", timeout=30)
    os.remove(binary_file)
    thread1.terminate()


@ttfw_idf.idf_example_test(env_tag="Example_WIFI")
def test_examples_protocol_advanced_https_ota_example_random(env, extra_data):
    """
    Working of OTA if random data is added in binary file are validated in this test case.
    Magic byte verification should fail in this case.
    steps: |
      1. join AP
      2. Generate random binary image
      3. Fetch OTA image over HTTPS
      4. Check working of code for random binary file
    """
    dut1 = env.get_dut("advanced_https_ota_example", "examples/system/ota/advanced_https_ota", dut_class=ttfw_idf.ESP32DUT)
    server_port = 8001
    # Random binary file to be generated
    random_bin_name = "random.bin"
    # Size of random binary file. 32000 is choosen, to reduce the time required to run the test-case
    random_bin_size = 32000
    # check and log bin size
    binary_file = os.path.join(dut1.app.binary_path, random_bin_name)
    fo = open(binary_file, "wb+")
    # First byte of binary file is always set to zero. If first byte is generated randomly,
    # in some cases it may generate 0xE9 which will result in failure of testcase.
    fo.write(struct.pack("B", 0))
    for i in range(random_bin_size - 1):
        fo.write(struct.pack("B", random.randrange(0,255,1)))
    fo.close()
    bin_size = os.path.getsize(binary_file)
    ttfw_idf.log_performance("advanced_https_ota_bin_size", "{}KB".format(bin_size // 1024))
    ttfw_idf.check_performance("advanced_https_ota_bin_size", bin_size // 1024)
    # start test
    host_ip = get_my_ip()
    if (get_server_status(host_ip, server_port) is False):
        thread1 = multiprocessing.Process(target=start_https_server, args=(dut1.app.binary_path, host_ip, server_port))
        thread1.daemon = True
        thread1.start()
    dut1.start_app()
    dut1.expect("Loaded app from partition at offset", timeout=30)
    try:
        ip_address = dut1.expect(re.compile(r" sta ip: ([^,]+),"), timeout=30)
        print("Connected to AP with IP: {}".format(ip_address))
    except DUT.ExpectTimeout:
        raise ValueError('ENV_TEST_FAILURE: Cannot connect to AP')
        thread1.terminate()
    dut1.expect('Starting Advanced OTA example', timeout=30)

    print("writing to device: {}".format("https://" + host_ip + ":" + str(server_port) + "/" + random_bin_name))
    dut1.write("https://" + host_ip + ":" + str(server_port) + "/" + random_bin_name)
    dut1.expect("esp_ota_ops: OTA image has invalid magic byte", timeout=10)
    os.remove(binary_file)
    thread1.terminate()


@ttfw_idf.idf_example_test(env_tag="Example_WIFI")
def test_examples_protocol_advanced_https_ota_example_chunked(env, extra_data):
    """
    This is a positive test case, which downloads complete binary file multiple number of times.
    Number of iterations can be specified in variable iterations.
    steps: |
      1. join AP
      2. Fetch OTA image over HTTPS
      3. Reboot with the new OTA image
    """
    dut1 = env.get_dut("advanced_https_ota_example", "examples/system/ota/advanced_https_ota", dut_class=ttfw_idf.ESP32DUT)
    # File to be downloaded. This file is generated after compilation
    bin_name = "advanced_https_ota.bin"
    # check and log bin size
    binary_file = os.path.join(dut1.app.binary_path, bin_name)
    bin_size = os.path.getsize(binary_file)
    ttfw_idf.log_performance("advanced_https_ota_bin_size", "{}KB".format(bin_size // 1024))
    ttfw_idf.check_performance("advanced_https_ota_bin_size", bin_size // 1024)
    # start test
    host_ip = get_my_ip()
    chunked_server = start_chunked_server(dut1.app.binary_path, 8070)
    dut1.start_app()
    dut1.expect("Loaded app from partition at offset", timeout=30)
    try:
        ip_address = dut1.expect(re.compile(r" sta ip: ([^,]+),"), timeout=30)
        print("Connected to AP with IP: {}".format(ip_address))
    except DUT.ExpectTimeout:
        raise ValueError('ENV_TEST_FAILURE: Cannot connect to AP')
    dut1.expect("Starting Advanced OTA example", timeout=30)

    print("writing to device: {}".format("https://" + host_ip + ":8070/" + bin_name))
    dut1.write("https://" + host_ip + ":8070/" + bin_name)
    dut1.expect("Loaded app from partition at offset", timeout=60)
    dut1.expect("Starting Advanced OTA example", timeout=30)
    chunked_server.kill()


@ttfw_idf.idf_example_test(env_tag="Example_WIFI")
def test_examples_protocol_advanced_https_ota_example_redirect_url(env, extra_data):
    """
    This is a positive test case, which starts a server and a redirection server.
    Redirection server redirects http_request to different port
    Number of iterations can be specified in variable iterations.
    steps: |
      1. join AP
      2. Fetch OTA image over HTTPS
      3. Reboot with the new OTA image
    """
    dut1 = env.get_dut("advanced_https_ota_example", "examples/system/ota/advanced_https_ota", dut_class=ttfw_idf.ESP32DUT)
    server_port = 8001
    # Port to which the request should be redirecetd
    redirection_server_port = 8081
    # File to be downloaded. This file is generated after compilation
    bin_name = "advanced_https_ota.bin"
    # check and log bin size
    binary_file = os.path.join(dut1.app.binary_path, bin_name)
    bin_size = os.path.getsize(binary_file)
    ttfw_idf.log_performance("advanced_https_ota_bin_size", "{}KB".format(bin_size // 1024))
    ttfw_idf.check_performance("advanced_https_ota_bin_size", bin_size // 1024)
    # start test
    host_ip = get_my_ip()
    if (get_server_status(host_ip, server_port) is False):
        thread1 = multiprocessing.Process(target=start_https_server, args=(dut1.app.binary_path, host_ip, server_port))
        thread1.daemon = True
        thread1.start()
    thread2 = multiprocessing.Process(target=start_redirect_server, args=(dut1.app.binary_path, host_ip, redirection_server_port, server_port))
    thread2.daemon = True
    thread2.start()
    dut1.start_app()
    dut1.expect("Loaded app from partition at offset", timeout=30)
    try:
        ip_address = dut1.expect(re.compile(r" sta ip: ([^,]+),"), timeout=30)
        print("Connected to AP with IP: {}".format(ip_address))
    except DUT.ExpectTimeout:
        raise ValueError('ENV_TEST_FAILURE: Cannot connect to AP')
        thread1.terminate()
        thread2.terminate()
    dut1.expect('Starting Advanced OTA example', timeout=30)

    print("writing to device: {}".format("https://" + host_ip + ":" + str(redirection_server_port) + "/" + bin_name))
    dut1.write("https://" + host_ip + ":" + str(redirection_server_port) + "/" + bin_name)
    dut1.expect("Loaded app from partition at offset", timeout=60)
    dut1.expect("Starting Advanced OTA example", timeout=30)
    dut1.reset()
    thread1.terminate()
    thread2.terminate()


if __name__ == '__main__':
    test_examples_protocol_advanced_https_ota_example()
    test_examples_protocol_advanced_https_ota_example_chunked()
    test_examples_protocol_advanced_https_ota_example_redirect_url()
    test_examples_protocol_advanced_https_ota_example_truncated_bin()
    test_examples_protocol_advanced_https_ota_example_truncated_header()
    test_examples_protocol_advanced_https_ota_example_random()