import os, shutil, tempfile
from contextlib import contextmanager
from libmproxy import flow, utils, controller
from libmproxy.console.flowview import FlowView
from libmproxy.console import ConsoleState
from netlib import certutils
from nose.plugins.skip import SkipTest
from mock import Mock

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

def treq(conn=None, content="content"):
    if not conn:
        conn = flow.ClientConnect(("address", 22))
    conn.reply = controller.DummyReply()
    headers = flow.ODictCaseless()
    headers["header"] = ["qvalue"]
    r = flow.Request(conn, (1, 1), "host", 80, "http", "GET", "/path", headers,
            content)
    r.reply = controller.DummyReply()
    return r


def tresp(req=None):
    if not req:
        req = treq()
    headers = flow.ODictCaseless()
    headers["header_response"] = ["svalue"]
    cert = certutils.SSLCert.from_der(file(test_data.path("data/dercert"),"rb").read())
    resp = flow.Response(req, (1, 1), 200, "message", headers, "content_response", cert)
    resp.reply = controller.DummyReply()
    return resp

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


def tflow(r=None):
    if r == None:
        r = treq()
    return flow.Flow(r)


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)


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__)