"""
Ported to Python 3.
"""

import time
import json

from urllib.parse import (
    quote,
)

from bs4 import (
    BeautifulSoup,
)

from twisted.web.template import Tag
from twisted.web.test.requesthelper import DummyRequest
from twisted.application import service
from testtools.twistedsupport import succeeded
from twisted.internet.defer import (
    inlineCallbacks,
    succeed,
)

from ...storage_client import (
    NativeStorageServer,
    StorageFarmBroker,
)
from ...web.root import (
    RootElement,
    Root,
)
from ...util.connection_status import ConnectionStatus
from ...crypto.ed25519 import (
    create_signing_keypair,
)
from allmydata.web.root import URIHandler
from allmydata.client import _Client

from .common import (
    assert_soup_has_tag_with_attributes,
)
from ..common_web import (
    render,
)
from ..common import (
    EMPTY_CLIENT_CONFIG,
)

from ..common import (
    SyncTestCase,
    AsyncTestCase,
)

from testtools.matchers import (
    Equals,
    Contains,
    AfterPreprocessing,
)

class RenderSlashUri(SyncTestCase):
    """
    Ensure that URIs starting with /uri?uri= only accept valid
    capabilities
    """

    def setUp(self):
        self.client = object()
        self.res = URIHandler(self.client)
        super(RenderSlashUri, self).setUp()

    @inlineCallbacks
    def test_valid_query_redirect(self):
        """
        A syntactically valid capability given in the ``uri`` query argument
        results in a redirect.
        """
        cap = (
            b"URI:CHK:nt2xxmrccp7sursd6yh2thhcky:"
            b"mukesarwdjxiyqsjinbfiiro6q7kgmmekocxfjcngh23oxwyxtzq:2:5:5874882"
        )
        query_args = {b"uri": [cap]}
        response_body = yield render(self.res, query_args)
        soup = BeautifulSoup(response_body, 'html5lib')
        tag = assert_soup_has_tag_with_attributes(
            self,
            soup,
            u"meta",
            {u"http-equiv": "refresh"},
        )
        self.assertThat(
            tag.attrs.get(u"content"),
            Contains(quote(cap, safe="")),
        )

    def test_invalid(self):
        """
        A syntactically invalid capbility results in an error.
        """
        query_args = {b"uri": [b"not a capability"]}
        response_body = render(self.res, query_args)
        self.assertThat(
            response_body,
            succeeded(AfterPreprocessing(bytes, Equals(b"Invalid capability"))),
        )


class RenderServiceRow(SyncTestCase):
    def test_missing(self):
        """
        minimally-defined static servers just need anonymous-storage-FURL
        and permutation-seed-base32. The WUI used to have problems
        rendering servers that lacked nickname and version. This tests that
        we can render such minimal servers.
        """
        ann = {"anonymous-storage-FURL": "pb://w2hqnbaa25yw4qgcvghl5psa3srpfgw3@tcp:127.0.0.1:51309/vucto2z4fxment3vfxbqecblbf6zyp6x",
               "permutation-seed-base32": "w2hqnbaa25yw4qgcvghl5psa3srpfgw3",
               }
        srv = NativeStorageServer(b"server_id", ann, None, {}, EMPTY_CLIENT_CONFIG)
        srv.get_connection_status = lambda: ConnectionStatus(False, "summary", {}, 0, 0)

        class FakeClient(_Client):
            def __init__(self):
                service.MultiService.__init__(self)
                self.storage_broker = StorageFarmBroker(
                    permute_peers=True,
                    tub_maker=None,
                    node_config=EMPTY_CLIENT_CONFIG,
                )
                self.storage_broker.test_add_server(b"test-srv", srv)

        root = RootElement(FakeClient(), time.time)
        req = DummyRequest(b"")
        tag = Tag(b"")

        # Pick all items from services table.
        items = root.services_table(req, tag).item(req, tag)

        # Coerce `items` to list and pick the first item from it.
        item = list(items)[0]

        self.assertThat(item.slotData.get("version"), Equals(""))
        self.assertThat(item.slotData.get("nickname"), Equals(""))


class RenderRoot(AsyncTestCase):

    @inlineCallbacks
    def test_root_json(self):
        """
        The 'welcome' / root page renders properly with ?t=json when some
        servers show None for available_space while others show a
        valid int

        See also https://tahoe-lafs.org/trac/tahoe-lafs/ticket/3852
        """
        ann = {
            "anonymous-storage-FURL": "pb://w2hqnbaa25yw4qgcvghl5psa3srpfgw3@tcp:127.0.0.1:51309/vucto2z4fxment3vfxbqecblbf6zyp6x",
            "permutation-seed-base32": "w2hqnbaa25yw4qgcvghl5psa3srpfgw3",
        }
        srv0 = NativeStorageServer(b"server_id0", ann, None, {}, EMPTY_CLIENT_CONFIG)
        srv0.get_connection_status = lambda: ConnectionStatus(False, "summary0", {}, 0, 0)

        srv1 = NativeStorageServer(b"server_id1", ann, None, {}, EMPTY_CLIENT_CONFIG)
        srv1.get_connection_status = lambda: ConnectionStatus(False, "summary1", {}, 0, 0)
        # arrange for this server to have some valid available space
        srv1.get_available_space = lambda: 12345

        class FakeClient(_Client):
            history = []
            stats_provider = object()
            nickname = ""
            nodeid = b"asdf"
            _node_public_key = create_signing_keypair()[1]
            introducer_clients = []
            helper = None

            def __init__(self):
                service.MultiService.__init__(self)
                self.storage_broker = StorageFarmBroker(
                    permute_peers=True,
                    tub_maker=None,
                    node_config=EMPTY_CLIENT_CONFIG,
                )
                self.storage_broker.test_add_server(b"test-srv0", srv0)
                self.storage_broker.test_add_server(b"test-srv1", srv1)

        root = Root(FakeClient(), now_fn=time.time)

        lines = []

        req = DummyRequest(b"")
        req.fields = {}
        req.args = {
            b"t": [b"json"],
        }

        # for some reason, DummyRequest is already finished when we
        # try to add a notifyFinish handler, so override that
        # behavior.

        def nop():
            return succeed(None)
        req.notifyFinish = nop
        req.write = lines.append

        yield root.render(req)

        raw_js = b"".join(lines).decode("utf8")
        js = json.loads(raw_js)
        servers = js["servers"]
        self.assertEquals(len(servers), 2)
        self.assertIn(
            {
                "connection_status": "summary0",
                "nodeid": "server_id0",
                "last_received_data": 0,
                "version": None,
                "available_space": None,
                "nickname": ""
            },
            servers
        )
        self.assertIn(
            {
                "connection_status": "summary1",
                "nodeid": "server_id1",
                "last_received_data": 0,
                "version": None,
                "available_space": 12345,
                "nickname": ""
            },
            servers
        )