from cStringIO import StringIO
import os, shutil, tempfile, argparse
from contextlib import contextmanager
import sys
from libmproxy import flow, utils, controller
from libmproxy.protocol import http
from libmproxy.proxy.connection import ClientConnection, ServerConnection
import mock_urwid
from libmproxy.console.flowview import FlowView
from libmproxy.console import ConsoleState
from libmproxy.protocol.primitives import Error
from netlib import certutils
from nose.plugins.skip import SkipTest
from mock import Mock
from time import time

def _SkipWindows():
    raise SkipTest("Skipped on Windows.")
def SkipWindows(fn):
    if os.name == "nt":
        return _SkipWindows
    else:
        return fn


def tclient_conn():
    c = ClientConnection._from_state(dict(
        address=dict(address=("address", 22), use_ipv6=True),
        clientcert=None
    ))
    c.reply = controller.DummyReply()
    return c


def tserver_conn():
    c = ServerConnection._from_state(dict(
        address=dict(address=("address", 22), use_ipv6=True),
        state=[],
        source_address=dict(address=("address", 22), use_ipv6=True),
        cert=None
    ))
    c.reply = controller.DummyReply()
    return c


def treq_absolute(conn=None, content="content"):
    r = treq(conn, content)
    r.form_in = r.form_out = "absolute"
    r.host = "address"
    r.port = 22
    r.scheme = "http"
    return r

def treq(conn=None, content="content"):
    if not conn:
        conn = tclient_conn()
    server_conn = tserver_conn()
    headers = flow.ODictCaseless()
    headers["header"] = ["qvalue"]

    f = http.HTTPFlow(conn, server_conn)
    f.request = http.HTTPRequest("relative", "GET", None, None, None, "/path", (1, 1), headers, content,
                                 None, None, None)
    f.request.reply = controller.DummyReply()
    return f.request


def tresp(req=None, content="message"):
    if not req:
        req = treq()
    f = req.flow

    headers = flow.ODictCaseless()
    headers["header_response"] = ["svalue"]
    cert = certutils.SSLCert.from_der(file(test_data.path("data/dercert"), "rb").read())
    f.server_conn = ServerConnection._from_state(dict(
        address=dict(address=("address", 22), use_ipv6=True),
        state=[],
        source_address=None,
        cert=cert.to_pem()))
    f.response = http.HTTPResponse((1, 1), 200, "OK", headers, content, time(), time())
    f.response.reply = controller.DummyReply()
    return f.response


def terr(req=None):
    if not req:
        req = treq()
    f = req.flow
    f.error = Error("error")
    f.error.reply = controller.DummyReply()
    return f.error

def tflow_noreq():
    f = tflow()
    f.request = None
    return f

def tflow(req=None):
    if not req:
        req = treq()
    return req.flow


def tflow_full():
    f = tflow()
    f.response = tresp(f.request)
    return f


def tflow_err():
    f = tflow()
    f.error = terr(f.request)
    return f

def tflowview(request_contents=None):
    m = Mock()
    cs = ConsoleState()
    if request_contents == None:
        flow = tflow()
    else:
        req = treq(None, request_contents)
        flow = tflow(req)

    fv = FlowView(m, cs, flow)
    return fv

def get_body_line(last_displayed_body, line_nb):
    return last_displayed_body.contents()[line_nb + 2]

@contextmanager
def tmpdir(*args, **kwargs):
    orig_workdir = os.getcwd()
    temp_workdir = tempfile.mkdtemp(*args, **kwargs)
    os.chdir(temp_workdir)

    yield temp_workdir

    os.chdir(orig_workdir)
    shutil.rmtree(temp_workdir)


class MockParser(argparse.ArgumentParser):
    """
    argparse.ArgumentParser sys.exits() by default.
    Make it more testable by throwing an exception instead.
    """
    def error(self, message):
        raise Exception(message)


def raises(exc, obj, *args, **kwargs):
    """
        Assert that a callable raises a specified exception.

        :exc An exception class or a string. If a class, assert that an
        exception of this type is raised. If a string, assert that the string
        occurs in the string representation of the exception, based on a
        case-insenstivie match.

        :obj A callable object.

        :args Arguments to be passsed to the callable.

        :kwargs Arguments to be passed to the callable.
    """
    try:
        apply(obj, args, kwargs)
    except Exception, v:
        if isinstance(exc, basestring):
            if exc.lower() in str(v).lower():
                return
            else:
                raise AssertionError(
                    "Expected %s, but caught %s"%(
                        repr(str(exc)), v
                    )
                )
        else:
            if isinstance(v, exc):
                return
            else:
                raise AssertionError(
                    "Expected %s, but caught %s %s"%(
                        exc.__name__, v.__class__.__name__, str(v)
                    )
                )
    raise AssertionError("No exception raised.")


@contextmanager
def capture_stderr(command, *args, **kwargs):
    out, sys.stderr = sys.stderr, StringIO()
    command(*args, **kwargs)
    yield sys.stderr.getvalue()
    sys.stderr = out

test_data = utils.Data(__name__)