# Copyright (c) 2017 crocoite contributors
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# THE SOFTWARE.

import asyncio, socket
from operator import itemgetter
from http.server import BaseHTTPRequestHandler
from datetime import datetime

from yarl import URL
from aiohttp import web
from multidict import CIMultiDict

from hypothesis import given
import hypothesis.strategies as st
import pytest

from .browser import RequestResponsePair, SiteLoader, VarChangeEvent, Request, \
        UnicodeBody, ReferenceTimestamp, Base64Body, UnicodeBody, Request, \
        Response
from .logger import Logger, Consumer
from .devtools import Crashed, Process

# if you want to know what’s going on:
#import logging
#logging.basicConfig(level=logging.DEBUG)

class AssertConsumer (Consumer):
    def __call__ (self, **kwargs):
        assert 'uuid' in kwargs
        assert 'msg' in kwargs
        assert 'context' in kwargs
        return kwargs

@pytest.fixture
def logger ():
    return Logger (consumer=[AssertConsumer ()])

@pytest.fixture
async def loader (logger):
    async with Process () as browser, SiteLoader (browser, logger) as l:
        yield l

@pytest.mark.asyncio
async def test_crash (loader):
    with pytest.raises (Crashed):
        await loader.tab.Page.crash ()

@pytest.mark.asyncio
async def test_invalidurl (loader):
    host = 'nonexistent.example'

    # make sure the url does *not* resolve (some DNS intercepting ISP’s mess
    # with this)
    loop = asyncio.get_event_loop ()
    try:
        resolved = await loop.getaddrinfo (host, None)
    except socket.gaierror:
        url = URL.build (scheme='http', host=host)
        await loader.navigate (url)
        async for it in loader:
            assert it.request is not None
            assert it.url == url
            assert it.response is None
            break
    else:
        pytest.skip (f'host {host} resolved to {resolved}')

@pytest.mark.asyncio
async def test_varchangeevent ():
    e = VarChangeEvent (True)
    assert e.get () == True

    # no change at all
    w = asyncio.ensure_future (e.wait ())
    finished, pending = await asyncio.wait ([w], timeout=0.1)
    assert not finished and pending

    # no change
    e.set (True)
    finished, pending = await asyncio.wait ([w], timeout=0.1)
    assert not finished and pending

    # changed
    e.set (False)
    await asyncio.sleep (0.1) # XXX: is there a yield() ?
    assert w.done ()
    ret = w.result ()
    assert ret == False
    assert e.get () == ret

timestamp = st.one_of (
                st.integers(min_value=0, max_value=2**32-1),
                st.floats (min_value=0, max_value=2**32-1),
                )

@given(timestamp, timestamp, timestamp)
def test_referencetimestamp (relativeA, absoluteA, relativeB):
    ts = ReferenceTimestamp (relativeA, absoluteA)
    absoluteA = datetime.utcfromtimestamp (absoluteA)
    absoluteB = ts (relativeB)
    assert (absoluteA < absoluteB and relativeA < relativeB) or \
            (absoluteA >= absoluteB and relativeA >= relativeB)
    assert abs ((absoluteB - absoluteA).total_seconds () - (relativeB - relativeA)) < 10e-6

def hostname ():
    # XXX: find a better way to generate hostnames
    return st.text (alphabet=st.sampled_from('abcdefghijklmnopqrstuvwxyz0123456789-'), min_size=1, max_size=253)

def urls ():
    """ Build http/https URL """
    scheme = st.sampled_from (['http', 'https'])
    # Path must start with a slash
    pathSt = st.builds (lambda x: '/' + x, st.text ())
    args = st.fixed_dictionaries ({
            'scheme': scheme,
            'host': hostname (),
            'port': st.one_of (st.none (), st.integers (min_value=1, max_value=2**16-1)),
            'path': pathSt,
            'query_string': st.text (),
            'fragment': st.text (),
            })
    return st.builds (lambda x: URL.build (**x), args)

def urlsStr ():
    return st.builds (lambda x: str (x), urls ())

asciiText = st.text (st.characters (min_codepoint=32, max_codepoint=126))

def chromeHeaders ():
    # token as defined by https://tools.ietf.org/html/rfc7230#section-3.2.6
    token = st.sampled_from('abcdefghijklmnopqrstuvwxyz0123456789!#$%&\'*+-.^_`|~')
    # XXX: the value should be asciiText without leading/trailing spaces
    return st.dictionaries (token, token)

def fixedDicts (fixed, dynamic):
    return st.builds (lambda x, y: x.update (y), st.fixed_dictionaries (fixed), st.lists (dynamic))

def chromeRequestWillBeSent (reqid, url):
    methodSt = st.sampled_from (['GET', 'POST', 'PUT', 'DELETE'])
    return st.fixed_dictionaries ({
            'requestId': reqid,
            'initiator': st.just ('Test'),
            'wallTime': timestamp,
            'timestamp': timestamp,
            'request': st.fixed_dictionaries ({
                'url': url,
                'method': methodSt,
                'headers': chromeHeaders (),
                # XXX: postData, hasPostData
                })
            })

def chromeResponseReceived (reqid, url):
    mimeTypeSt = st.one_of (st.none (), st.just ('text/html'))
    remoteIpAddressSt = st.one_of (st.none (), st.just ('127.0.0.1'))
    protocolSt = st.one_of (st.none (), st.just ('h2'))
    statusCodeSt = st.integers (min_value=100, max_value=999)
    typeSt = st.sampled_from (['Document', 'Stylesheet', 'Image', 'Media',
            'Font', 'Script', 'TextTrack', 'XHR', 'Fetch', 'EventSource',
            'WebSocket', 'Manifest', 'SignedExchange', 'Ping',
            'CSPViolationReport', 'Other'])
    return st.fixed_dictionaries ({
            'requestId': reqid,
            'timestamp': timestamp,
            'type': typeSt,
            'response': st.fixed_dictionaries ({
                'url': url,
                'requestHeaders': chromeHeaders (), # XXX: make this optional
                'headers': chromeHeaders (),
                'status': statusCodeSt,
                'statusText': asciiText,
                'mimeType': mimeTypeSt,
                'remoteIPAddress': remoteIpAddressSt,
                'protocol': protocolSt,
                })
            })

def chromeReqResp ():
    # XXX: will this gnerated the same url for all testcases?
    reqid = st.shared (st.text (), 'reqresp')
    url = st.shared (urlsStr (), 'reqresp')
    return st.tuples (chromeRequestWillBeSent (reqid, url),
            chromeResponseReceived (reqid, url))

def requestResponsePair ():
    def f (creq, cresp, hasPostData, reqBody, respBody):
        i = RequestResponsePair ()
        i.fromRequestWillBeSent (creq)
        i.request.hasPostData = hasPostData
        if hasPostData:
            i.request.body = reqBody

        if cresp is not None:
            i.fromResponseReceived (cresp)
            if respBody is not None:
                i.response.body = respBody
        return i

    bodySt = st.one_of (
            st.none (),
            st.builds (UnicodeBody, st.text ()),
            st.builds (Base64Body.fromBytes, st.binary ())
            )
    return st.builds (lambda reqresp, hasPostData, reqBody, respBody:
            f (reqresp[0], reqresp[1], hasPostData, reqBody, respBody),
            chromeReqResp (), st.booleans (), bodySt, bodySt)

@given(chromeReqResp ())
def test_requestResponsePair (creqresp):
    creq, cresp = creqresp

    item = RequestResponsePair ()

    assert item.id is None
    assert item.url is None
    assert item.request is None
    assert item.response is None

    item.fromRequestWillBeSent (creq)

    assert item.id == creq['requestId']
    url = URL (creq['request']['url'])
    assert item.url == url
    assert item.request is not None
    assert item.request.timestamp == datetime.utcfromtimestamp (creq['wallTime'])
    assert set (item.request.headers.keys ()) == set (creq['request']['headers'].keys ())
    assert item.response is None

    item.fromResponseReceived (cresp)

    # url will not be overwritten
    assert item.id == creq['requestId'] == cresp['requestId']
    assert item.url == url
    assert item.request is not None
    assert set (item.request.headers.keys ()) == set (cresp['response']['requestHeaders'].keys ())
    assert item.response is not None
    assert set (item.response.headers.keys ()) == set (cresp['response']['headers'].keys ())
    assert (item.response.timestamp - item.request.timestamp).total_seconds () - \
            (cresp['timestamp'] - creq['timestamp']) < 10e-6

@given(chromeReqResp ())
def test_requestResponsePair_eq (creqresp):
    creq, cresp = creqresp

    item = RequestResponsePair ()
    item2 = RequestResponsePair ()
    assert item == item
    assert item == item2

    item.fromRequestWillBeSent (creq)
    assert item != item2
    item2.fromRequestWillBeSent (creq)
    assert item == item
    assert item == item2

    item.fromResponseReceived (cresp)
    assert item != item2
    item2.fromResponseReceived (cresp)
    assert item == item
    assert item == item2

    # XXX: test for inequality with different parameters

### Google Chrome integration tests ###

serverUrl = URL.build (scheme='http', host='localhost', port=8080)
items = [
    RequestResponsePair (
        url=serverUrl.with_path ('/encoding/utf-8'),
        request=Request (method='GET'),
        response=Response (status=200, headers=CIMultiDict ([('Content-Type', 'text/html; charset=utf-8')]),
            body=UnicodeBody ('äöü'), mimeType='text/html')
        ),
    RequestResponsePair (
        url=serverUrl.with_path ('/encoding/latin1'),
        request=Request (method='GET'),
        response=Response (status=200, headers=CIMultiDict ([('Content-Type', 'text/html; charset=latin1')]),
            body=UnicodeBody ('äöü'), mimeType='text/html')
        ),
    RequestResponsePair (
        url=serverUrl.with_path ('/encoding/utf-16'),
        request=Request (method='GET'),
        response=Response (status=200, headers=CIMultiDict ([('Content-Type', 'text/html; charset=utf-16')]),
            body=UnicodeBody ('äöü'), mimeType='text/html')
        ),
    RequestResponsePair (
        url=serverUrl.with_path ('/encoding/ISO-8859-1'),
        request=Request (method='GET'),
        response=Response (status=200, headers=CIMultiDict ([('Content-Type', 'text/html; charset=ISO-8859-1')]),
            body=UnicodeBody ('äöü'), mimeType='text/html')
        ),
    RequestResponsePair (
        url=serverUrl.with_path ('/status/200'),
        request=Request (method='GET'),
        response=Response (status=200, headers=CIMultiDict ([('Content-Type', 'text/plain')]),
            body=b'',
            mimeType='text/plain'),
        ),
    # redirects never have a response body
    RequestResponsePair (
        url=serverUrl.with_path ('/status/301'),
        request=Request (method='GET'),
        response=Response (status=301,
            headers=CIMultiDict ([('Content-Type', 'text/plain'),
                ('Location', str (serverUrl.with_path ('/status/301/redirected')))]),
            body=None,
            mimeType='text/plain'),
        ),
    RequestResponsePair (
        url=serverUrl.with_path ('/image/png'),
        request=Request (method='GET'),
        response=Response (status=200, headers=CIMultiDict ([('Content-Type', 'image/png')]),
            body=Base64Body.fromBytes (b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR\x00\x00\x00\x01\x00\x00\x00\x01\x08\x00\x00\x00\x00:~\x9bU\x00\x00\x00\nIDAT\x08\x1dc\xf8\x0f\x00\x01\x01\x01\x006_g\x80\x00\x00\x00\x00IEND\xaeB`\x82'),
            mimeType='image/png'),
        ),
    RequestResponsePair (
        url=serverUrl.with_path ('/script/alert'),
        request=Request (method='GET'),
        response=Response (status=200, headers=CIMultiDict ([('Content-Type', 'text/html; charset=utf-8')]),
            body=UnicodeBody ('''<html><body><script>
window.addEventListener("beforeunload", function (e) {
    e.returnValue = "bye?";
    return e.returnValue;
});
alert("stopping here");
if (confirm("are you sure?") || prompt ("42?")) {
    window.location = "/nonexistent";
}
</script></body></html>'''), mimeType='text/html')
        ),
    ]

@pytest.mark.asyncio
# would be nice if we could use hypothesis here somehow
@pytest.mark.parametrize("golden", items)
async def test_integration_item (loader, golden):
    async def f (req):
        body = golden.response.body
        contentType = golden.response.headers.get ('content-type', '') if golden.response.headers is not None else ''
        charsetOff = contentType.find ('charset=')
        if isinstance (body, UnicodeBody) and charsetOff != -1:
            encoding = contentType[charsetOff+len ('charset='):]
            body = golden.response.body.decode ('utf-8').encode (encoding)
        return web.Response (body=body, status=golden.response.status,
                headers=golden.response.headers)

    app = web.Application ()
    app.router.add_route (golden.request.method, golden.url.path, f)
    runner = web.AppRunner(app)
    await runner.setup()
    site = web.TCPSite(runner, serverUrl.host, serverUrl.port)
    await site.start()

    try:
        await loader.navigate (golden.url)

        it = loader.__aiter__ ()
        item = await it.__anext__ ()

        # we do not know this in advance
        item.request.initiator = None
        item.request.headers = None
        item.remoteIpAddress = None
        item.protocol = None
        item.resourceType = None

        if item.response:
            assert item.response.statusText is not None
            item.response.statusText = None

            del item.response.headers['server']
            del item.response.headers['content-length']
            del item.response.headers['date']
        assert item == golden
    finally:
        await runner.cleanup ()