# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
# SPDX-License-Identifier: Apache-2.0.
import argparse
import sys
import os
from io import BytesIO
from awscrt import io, http
from urllib.parse import urlparse


def print_header_list(headers):
    for name, value in headers:
        print('{}: {}'.format(name, value))


parser = argparse.ArgumentParser()
parser.add_argument(
    'url',
    help='URL to make request to. HTTPS is assumed unless port 80 is specified or HTTP is specified in the scheme.')
parser.add_argument('--cacert', required=False, help='FILE: path to a CA certificate file.')
parser.add_argument('--capath', required=False, help='PATH: path to a directory containing CA files.')
parser.add_argument('--cert', required=False, help='FILE: path to a PEM encoded certificate to use with mTLS')
parser.add_argument('--key', required=False, help='FILE: Path to a PEM encoded private key that matches cert.')
parser.add_argument(
    '--connect_timeout',
    required=False,
    type=int,
    help='INT: time in milliseconds to wait for a connection.',
    default=5000)
parser.add_argument(
    '-H',
    '--header',
    required=False,
    help='STRING: line to send as a header in format "name:value". May be specified multiple times.',
    action='append')
parser.add_argument('-d', '--data', required=False, help='STRING: Data to POST or PUT.')
parser.add_argument('--data_file', required=False, help='FILE: File to read from file and POST or PUT')
parser.add_argument(
    '-M',
    '--method',
    required=False,
    help='STRING: Http Method verb to use for the request',
    default='GET')
parser.add_argument('-G', '--get', required=False, help='uses GET for the verb', action='store_true')
parser.add_argument('-P', '--post', required=False, help='uses POST for the verb', action='store_true')
parser.add_argument('-I', '--head', required=False, help='uses HEAD for the verb', action='store_true')
parser.add_argument(
    '-i',
    '--include',
    required=False,
    help='Includes headers in output',
    action='store_true',
    default=False)
parser.add_argument(
    '-k',
    '--insecure',
    required=False,
    help='Turns off x.509 validation',
    action='store_true',
    default=False)
parser.add_argument('-o', '--output', required=False, help='FILE: dumps content-body to FILE instead of stdout.')
parser.add_argument('-t', '--trace', required=False, help='FILE: dumps logs to FILE instead of stderr.')
parser.add_argument(
    '-p',
    '--alpn',
    default=["h2", "http/1.1"],
    required=False,
    help='STRING: protocol for ALPN. May be specified multiple times.',
    action='append')
parser.add_argument(
    '--http2',
    required=False,
    help='HTTP/2 connection required',
    action="store_true")
parser.add_argument(
    '--http1_1',
    required=False,
    help='HTTP/1.1 connection required',
    action="store_true")
parser.add_argument(
    '-v',
    '--verbose',
    required=False,
    help='ERROR|INFO|DEBUG|TRACE: log level to configure. Default is none.')

args = parser.parse_args()

output = getattr(sys.stdout, 'buffer', sys.stdout)

if args.output:
    output = open(args.output, mode='wb')

# setup the logger if user request logging

if args.verbose:
    log_level = io.LogLevel.NoLogs

    if args.verbose == 'ERROR':
        log_level = io.LogLevel.Error
    elif args.verbose == 'INFO':
        log_level = io.LogLevel.Info
    elif args.verbose == 'DEBUG':
        log_level = io.LogLevel.Debug
    elif args.verbose == 'TRACE':
        log_level = io.LogLevel.Trace
    else:
        print('{} unsupported value for the verbose option'.format(args.verbose))
        exit(-1)

    log_output = 'stderr'

    if args.trace:
        log_output = args.trace

    io.init_logging(log_level, log_output)


required_version = http.HttpVersion.Unknown
if args.http1_1:
    required_version = http.HttpVersion.Http1_1
    args.alpn = ["http/1.1"]
if args.http2:
    required_version = http.HttpVersion.Http2
    args.alpn = ["h2"]


# an event loop group is needed for IO operations. Unless you're a server or a client doing hundreds of connections
# you only want one of these.
event_loop_group = io.EventLoopGroup(1)

host_resolver = io.DefaultHostResolver(event_loop_group)

# client bootstrap knows how to connect all the pieces. In this case it also has the default dns resolver
# baked in.
client_bootstrap = io.ClientBootstrap(event_loop_group, host_resolver)

url = urlparse(args.url)
port = 443
scheme = 'https'

if url.scheme is not None and url.scheme == 'http':
    scheme = 'http'

if url.port is not None:
    port = url.port
else:
    if scheme == 'http':
        port = 80
        if args.http2:
            sys.exit("Error, we don't support h2c, please use TLS for HTTP/2 connection")


tls_connection_options = None

if scheme == 'https':
    if args.cert is not None and args.key is not None:
        tls_ctx_options = io.TlsContextOptions.create_client_with_mtls_from_path(args.cert, args.key)
    else:
        tls_ctx_options = io.TlsContextOptions()

    if args.cacert is not None or args.capath is not None:
        tls_ctx_options.override_default_trust_store_from_path(args.capath, args.cacert)

    if args.insecure:
        tls_ctx_options.verify_peer = False

    tls_ctx = io.ClientTlsContext(tls_ctx_options)

    tls_connection_options = tls_ctx.new_connection_options()
    tls_connection_options.set_server_name(url.hostname)

    if args.alpn:
        tls_connection_options.set_alpn_list(args.alpn)

# invoked up on the connection closing


def on_connection_shutdown(shutdown_future):
    print('connection close with error: {}'.format(shutdown_future.exception()))


# invoked by the http request call as the response body is received in chunks
def on_incoming_body(http_stream, chunk, **kwargs):
    output.write(chunk)


data_len = 0
data_stream = None

if args.data:
    data_bytes = args.data.encode(encoding='utf-8')
    data_len = len(data_bytes)
    data_stream = BytesIO(data_bytes)
elif args.data_file:
    data_len = os.stat(args.data_file).st_size
    data_stream = open(args.data_file, 'rb')


socket_options = io.SocketOptions()
socket_options.connect_timeout_ms = args.connect_timeout

hostname = url.hostname
connect_future = http.HttpClientConnection.new(
    host_name=hostname,
    port=port,
    socket_options=socket_options,
    tls_connection_options=tls_connection_options,
    bootstrap=client_bootstrap)

connection = connect_future.result(10)
connection.shutdown_future.add_done_callback(on_connection_shutdown)

if required_version:
    if connection.version != required_version:
        error_msg = "Error. The requested HTTP version " + args.alpn[0] + " is not supported by the peer."
        sys.exit(error_msg)


request = http.HttpRequest(args.method, body_stream=data_stream)

if args.get:
    request.method = "GET"

if args.post:
    request.method = "POST"

if args.head:
    request.method = "HEAD"

if url.path:
    request.path = url.path

if url.query:
    request.path += '?' + url.query

if connection.version == http.HttpVersion.Http2:
    request.headers.add(':authority', hostname)
else:
    request.headers.add('host', hostname)
request.headers.add('user-agent', 'elasticurl.py 1.0, Powered by the AWS Common Runtime.')

if data_len != 0:
    request.headers.add('content-length', str(data_len))

if args.header:
    for i in args.header:
        name, value = i.split(':')
        request.headers.add(name.strip(), value.strip())

# invoked as soon as the response headers are received


def response_received_cb(http_stream, status_code, headers, **kwargs):
    if args.include:
        print('Response Code: {}'.format(status_code))
        print_header_list(headers)


# make the request
stream = connection.request(request, response_received_cb, on_incoming_body)
stream.activate()

# wait until the full response is finished
stream.completion_future.result()
stream = None
connection = None

if data_stream:
    data_stream.close()

if args.output:
    output.close()