import os, shutil, tempfile, argparse
from contextlib import contextmanager
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 tflow(client_conn=True, server_conn=True, req=True, resp=None, err=None):
    """
    @type client_conn: bool | None | libmproxy.proxy.connection.ClientConnection
    @type server_conn: bool | None | libmproxy.proxy.connection.ServerConnection
    @type req:         bool | None | libmproxy.protocol.http.HTTPRequest
    @type resp:        bool | None | libmproxy.protocol.http.HTTPResponse
    @type err:         bool | None | libmproxy.protocol.primitives.Error
    @return:           bool | None | libmproxy.protocol.http.HTTPFlow
    """
    if client_conn is True:
        client_conn = tclient_conn()
    if server_conn is True:
        server_conn = tserver_conn()
    if req is True:
        req = treq()
    if resp is True:
        resp = tresp()
    if err is True:
        err = terr()

    f = http.HTTPFlow(client_conn, server_conn)
    f.request = req
    f.response = resp
    f.error = err
    f.reply = controller.DummyReply()
    return f


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


def tserver_conn():
    """
    @return: libmproxy.proxy.connection.ServerConnection
    """
    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(content="content", scheme="http", host="address", port=22):
    """
    @return: libmproxy.protocol.http.HTTPRequest
    """
    headers = flow.ODictCaseless()
    headers["header"] = ["qvalue"]
    req = http.HTTPRequest("relative", "GET", scheme, host, port, "/path", (1, 1), headers, content,
                                 None, None, None)
    return req

def treq_absolute(content="content"):
    """
    @return: libmproxy.protocol.http.HTTPRequest
    """
    r = treq(content)
    r.form_in = r.form_out = "absolute"
    r.host = "address"
    r.port = 22
    r.scheme = "http"
    return r


def tresp(content="message"):
    """
    @return: libmproxy.protocol.http.HTTPResponse
    """

    headers = flow.ODictCaseless()
    headers["header_response"] = ["svalue"]

    resp = http.HTTPResponse((1, 1), 200, "OK", headers, content, time(), time())
    return resp


def terr(content="error"):
    """
    @return: libmproxy.protocol.primitives.Error
    """
    err = Error(content)
    return err

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

    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.")

test_data = utils.Data(__name__)