import nilmdb.server

from nose.tools import *
from nose.tools import assert_raises
import distutils.version
import simplejson as json
import itertools
import os
import sys
import threading
import urllib2
from urllib2 import urlopen, HTTPError
import cStringIO
import time
import requests

from nilmdb.utils import serializer_proxy

testdb = "tests/testdb"

#@atexit.register
#def cleanup():
#    os.unlink(testdb)

from testutil.helpers import *

class Test00Nilmdb(object):  # named 00 so it runs first
    def test_NilmDB(self):
        recursive_unlink(testdb)

        with assert_raises(IOError):
            nilmdb.server.NilmDB("/nonexistant-db/foo")

        db = nilmdb.server.NilmDB(testdb)
        db.close()
        db = nilmdb.server.NilmDB(testdb)
        db.close()

        # test timer, just to get coverage
        capture = cStringIO.StringIO()
        old = sys.stdout
        sys.stdout = capture
        with nilmdb.utils.Timer("test"):
            time.sleep(0.01)
        sys.stdout = old
        in_("test: ", capture.getvalue())

    def test_stream(self):
        db = nilmdb.server.NilmDB(testdb)
        eq_(db.stream_list(), [])

        # Bad path
        with assert_raises(ValueError):
            db.stream_create("foo/bar/baz", "float32_8")
        with assert_raises(ValueError):
            db.stream_create("/foo", "float32_8")
        # Bad layout type
        with assert_raises(ValueError):
            db.stream_create("/newton/prep", "NoSuchLayout")
        db.stream_create("/newton/prep", "float32_8")
        db.stream_create("/newton/raw", "uint16_6")
        db.stream_create("/newton/zzz/rawnotch", "uint16_9")

        # Verify we got 3 streams
        eq_(db.stream_list(), [ ["/newton/prep", "float32_8"],
                                ["/newton/raw", "uint16_6"],
                                ["/newton/zzz/rawnotch", "uint16_9"]
                                ])
        # Match just one type or one path
        eq_(db.stream_list(layout="uint16_6"), [ ["/newton/raw", "uint16_6"] ])
        eq_(db.stream_list(path="/newton/raw"), [ ["/newton/raw", "uint16_6"] ])

        # Verify that columns were made right (pytables specific)
        if "h5file" in db.data.__dict__:
            h5file = db.data.h5file
            eq_(len(h5file.getNode("/newton/prep").cols), 9)
            eq_(len(h5file.getNode("/newton/raw").cols), 7)
            eq_(len(h5file.getNode("/newton/zzz/rawnotch").cols), 10)
            assert(not h5file.getNode("/newton/prep").colindexed["timestamp"])
            assert(not h5file.getNode("/newton/prep").colindexed["c1"])

        # Set / get metadata
        eq_(db.stream_get_metadata("/newton/prep"), {})
        eq_(db.stream_get_metadata("/newton/raw"), {})
        meta1 = { "description": "The Data",
                  "v_scale": "1.234" }
        meta2 = { "description": "The Data" }
        meta3 = { "v_scale": "1.234" }
        db.stream_set_metadata("/newton/prep", meta1)
        db.stream_update_metadata("/newton/prep", {})
        db.stream_update_metadata("/newton/raw", meta2)
        db.stream_update_metadata("/newton/raw", meta3)
        eq_(db.stream_get_metadata("/newton/prep"), meta1)
        eq_(db.stream_get_metadata("/newton/raw"), meta1)

        # fill in some test coverage for start >= end
        with assert_raises(nilmdb.server.NilmDBError):
            db.stream_remove("/newton/prep", 0, 0)
        with assert_raises(nilmdb.server.NilmDBError):
            db.stream_remove("/newton/prep", 1, 0)
        db.stream_remove("/newton/prep", 0, 1)

        db.close()

class TestBlockingServer(object):
    def setUp(self):
        self.db = serializer_proxy(nilmdb.server.NilmDB)(testdb)

    def tearDown(self):
        self.db.close()

    def test_blocking_server(self):
        # Server should fail if the database doesn't have a "_thread_safe"
        # property.
        with assert_raises(KeyError):
            nilmdb.server.Server(object())

        # Start web app on a custom port
        self.server = nilmdb.server.Server(self.db, host = "127.0.0.1",
                                           port = 32180, stoppable = True)

        # Run it
        event = threading.Event()
        def run_server():
            self.server.start(blocking = True, event = event)
        thread = threading.Thread(target = run_server)
        thread.start()
        if not event.wait(timeout = 10):
            raise AssertionError("server didn't start in 10 seconds")

        # Send request to exit.
        req = urlopen("http://127.0.0.1:32180/exit/", timeout = 1)

        # Wait for it
        thread.join()

def geturl(path):
    req = urlopen("http://127.0.0.1:32180" + path, timeout = 10)
    return req.read()

def getjson(path):
    return json.loads(geturl(path))

class TestServer(object):

    def setUp(self):
        # Start web app on a custom port
        self.db = serializer_proxy(nilmdb.server.NilmDB)(testdb)
        self.server = nilmdb.server.Server(self.db, host = "127.0.0.1",
                                           port = 32180, stoppable = False)
        self.server.start(blocking = False)

    def tearDown(self):
        # Close web app
        self.server.stop()
        self.db.close()

    def test_server(self):
        # Make sure we can't force an exit, and test other 404 errors
        for url in [ "/exit", "/", "/favicon.ico" ]:
            with assert_raises(HTTPError) as e:
                geturl(url)
            eq_(e.exception.code, 404)

        # Check version
        eq_(distutils.version.LooseVersion(getjson("/version")),
            distutils.version.LooseVersion(nilmdb.__version__))

    def test_stream_list(self):
        # Known streams that got populated by an earlier test (test_nilmdb)
        streams = getjson("/stream/list")

        eq_(streams, [
            ['/newton/prep', 'float32_8'],
            ['/newton/raw', 'uint16_6'],
            ['/newton/zzz/rawnotch', 'uint16_9'],
            ])

        streams = getjson("/stream/list?layout=uint16_6")
        eq_(streams, [['/newton/raw', 'uint16_6']])

        streams = getjson("/stream/list?layout=NoSuchLayout")
        eq_(streams, [])


    def test_stream_metadata(self):
        with assert_raises(HTTPError) as e:
            getjson("/stream/get_metadata?path=foo")
        eq_(e.exception.code, 404)

        data = getjson("/stream/get_metadata?path=/newton/prep")
        eq_(data, {'description': 'The Data', 'v_scale': '1.234'})

        data = getjson("/stream/get_metadata?path=/newton/prep"
                       "&key=v_scale")
        eq_(data, {'v_scale': '1.234'})

        data = getjson("/stream/get_metadata?path=/newton/prep"
                       "&key=v_scale&key=description")
        eq_(data, {'description': 'The Data', 'v_scale': '1.234'})

        data = getjson("/stream/get_metadata?path=/newton/prep"
                       "&key=v_scale&key=foo")
        eq_(data, {'foo': None, 'v_scale': '1.234'})

        data = getjson("/stream/get_metadata?path=/newton/prep"
                       "&key=foo")
        eq_(data, {'foo': None})

    def test_cors_headers(self):
        # Test that CORS headers are being set correctly

        # Normal GET should send simple response
        url = "http://127.0.0.1:32180/stream/list"
        r = requests.get(url, headers = { "Origin": "http://google.com/" })
        eq_(r.status_code, 200)
        if "access-control-allow-origin" not in r.headers:
            raise AssertionError("No Access-Control-Allow-Origin (CORS) "
                                 "header in response:\n", r.headers)
        eq_(r.headers["access-control-allow-origin"], "http://google.com/")

        # OPTIONS without CORS preflight headers should result in 405
        r = requests.options(url, headers = {
            "Origin": "http://google.com/",
            })
        eq_(r.status_code, 405)

        # OPTIONS with preflight headers should give preflight response
        r = requests.options(url, headers = {
            "Origin": "http://google.com/",
            "Access-Control-Request-Method": "POST",
            "Access-Control-Request-Headers": "X-Custom",
            })
        eq_(r.status_code, 200)
        if "access-control-allow-origin" not in r.headers:
            raise AssertionError("No Access-Control-Allow-Origin (CORS) "
                                 "header in response:\n", r.headers)
        eq_(r.headers["access-control-allow-methods"], "GET, HEAD")
        eq_(r.headers["access-control-allow-headers"], "X-Custom")

    def test_post_bodies(self):
        # Test JSON post bodies
        r = requests.post("http://127.0.0.1:32180/stream/set_metadata",
                          headers = { "Content-Type": "application/json" },
                          data = '{"hello": 1}')
        eq_(r.status_code, 404) # wrong parameters

        r = requests.post("http://127.0.0.1:32180/stream/set_metadata",
                          headers = { "Content-Type": "application/json" },
                          data = '["hello"]')
        eq_(r.status_code, 415) # not a dict

        r = requests.post("http://127.0.0.1:32180/stream/set_metadata",
                          headers = { "Content-Type": "application/json" },
                          data = '[hello]')
        eq_(r.status_code, 400) # badly formatted JSON