from __future__ import print_function, absolute_import
import os
import signal
import sys
import netlib.version
from . import version, cmdline
from .proxy import process_proxy_options, ProxyServerError
from .proxy.server import DummyServer, ProxyServer


# This file is not included in coverage analysis or tests - anything that can be
# tested should live elsewhere.

def check_versions():
    """
    Having installed a wrong version of pyOpenSSL or netlib is unfortunately a
    very common source of error. Check before every start that both versions are
    somewhat okay.
    """
    # We don't introduce backward-incompatible changes in patch versions. Only
    # consider major and minor version.
    if netlib.version.IVERSION[:2] != version.IVERSION[:2]:
        print(
            "Warning: You are using mitmdump %s with netlib %s. "
            "Most likely, that won't work - please upgrade!" % (
                version.VERSION, netlib.version.VERSION
            ),
            file=sys.stderr
        )
    import OpenSSL
    import inspect
    v = tuple([int(x) for x in OpenSSL.__version__.split(".")][:2])
    if v < (0, 14):
        print(
            "You are using an outdated version of pyOpenSSL:"
            " mitmproxy requires pyOpenSSL 0.14 or greater.",
            file=sys.stderr
        )
        # Some users apparently have multiple versions of pyOpenSSL installed.
        # Report which one we got.
        pyopenssl_path = os.path.dirname(inspect.getfile(OpenSSL))
        print(
            "Your pyOpenSSL %s installation is located at %s" % (
                OpenSSL.__version__, pyopenssl_path
            ),
            file=sys.stderr
        )
        sys.exit(1)


def assert_utf8_env():
    spec = ""
    for i in ["LANG", "LC_CTYPE", "LC_ALL"]:
        spec += os.environ.get(i, "").lower()
    if "utf" not in spec:
        print(
            "Error: mitmproxy requires a UTF console environment.",
            file=sys.stderr
        )
        print(
            "Set your LANG enviroment variable to something like en_US.UTF-8",
            file=sys.stderr
        )
        sys.exit(1)


def get_server(dummy_server, options):
    if dummy_server:
        return DummyServer(options)
    else:
        try:
            return ProxyServer(options)
        except ProxyServerError, v:
            print(str(v), file=sys.stderr)
            sys.exit(1)


def mitmproxy():  # pragma: nocover
    from . import console

    check_versions()
    assert_utf8_env()

    parser = cmdline.mitmproxy()
    options = parser.parse_args()
    if options.quiet:
        options.verbose = 0

    proxy_config = process_proxy_options(parser, options)
    console_options = console.Options(**cmdline.get_common_options(options))
    console_options.palette = options.palette
    console_options.eventlog = options.eventlog
    console_options.intercept = options.intercept

    server = get_server(console_options.no_server, proxy_config)

    m = console.ConsoleMaster(server, console_options)
    try:
        m.run()
    except KeyboardInterrupt:
        pass


def mitmdump():  # pragma: nocover
    from . import dump

    check_versions()

    parser = cmdline.mitmdump()
    options = parser.parse_args()
    if options.quiet:
        options.verbose = 0
        options.flow_detail = 0

    proxy_config = process_proxy_options(parser, options)
    dump_options = dump.Options(**cmdline.get_common_options(options))
    dump_options.flow_detail = options.flow_detail
    dump_options.keepserving = options.keepserving
    dump_options.filtstr = " ".join(options.args) if options.args else None

    server = get_server(dump_options.no_server, proxy_config)

    try:
        master = dump.DumpMaster(server, dump_options)

        def cleankill(*args, **kwargs):
            master.shutdown()

        signal.signal(signal.SIGTERM, cleankill)
        master.run()
    except dump.DumpError as e:
        print("mitmdump: %s" % e, file=sys.stderr)
        sys.exit(1)
    except KeyboardInterrupt:
        pass


def mitmweb():  # pragma: nocover
    from . import web

    check_versions()
    parser = cmdline.mitmweb()

    options = parser.parse_args()
    if options.quiet:
        options.verbose = 0

    proxy_config = process_proxy_options(parser, options)
    web_options = web.Options(**cmdline.get_common_options(options))
    web_options.intercept = options.intercept
    web_options.wdebug = options.wdebug
    web_options.wiface = options.wiface
    web_options.wport = options.wport

    server = get_server(web_options.no_server, proxy_config)

    m = web.WebMaster(server, web_options)
    try:
        m.run()
    except KeyboardInterrupt:
        pass