#! coding: utf-8

import itertools
import time
from unittest import TestCase

from dogpile.cache import util
from dogpile.cache.api import NO_VALUE
from dogpile.util import compat
from . import eq_
from . import winsleep
from ._fixtures import _GenericBackendFixture


class DecoratorTest(_GenericBackendFixture, TestCase):
    backend = "dogpile.cache.memory"

    def _fixture(
        self, namespace=None, expiration_time=None, key_generator=None
    ):
        reg = self._region(config_args={"expiration_time": 0.25})

        counter = itertools.count(1)

        @reg.cache_on_arguments(
            namespace=namespace,
            expiration_time=expiration_time,
            function_key_generator=key_generator,
        )
        def go(a, b):
            val = next(counter)
            return val, a, b

        return go

    def _multi_fixture(
        self, namespace=None, expiration_time=None, key_generator=None
    ):

        reg = self._region(config_args={"expiration_time": 0.25})

        counter = itertools.count(1)

        @reg.cache_multi_on_arguments(
            namespace=namespace,
            expiration_time=expiration_time,
            function_multi_key_generator=key_generator,
        )
        def go(*args):
            val = next(counter)
            return ["%d %s" % (val, arg) for arg in args]

        return go

    def test_decorator(self):
        go = self._fixture()
        eq_(go(1, 2), (1, 1, 2))
        eq_(go(3, 4), (2, 3, 4))
        eq_(go(1, 2), (1, 1, 2))
        time.sleep(0.3)
        eq_(go(1, 2), (3, 1, 2))

    def test_decorator_namespace(self):
        # TODO: test the namespace actually
        # working somehow...
        go = self._fixture(namespace="x")
        eq_(go(1, 2), (1, 1, 2))
        eq_(go(3, 4), (2, 3, 4))
        eq_(go(1, 2), (1, 1, 2))
        time.sleep(0.3)
        eq_(go(1, 2), (3, 1, 2))

    def test_decorator_custom_expire(self):
        go = self._fixture(expiration_time=0.5)
        eq_(go(1, 2), (1, 1, 2))
        eq_(go(3, 4), (2, 3, 4))
        eq_(go(1, 2), (1, 1, 2))
        time.sleep(0.3)
        eq_(go(1, 2), (1, 1, 2))
        time.sleep(0.3)
        eq_(go(1, 2), (3, 1, 2))

    def test_decorator_expire_callable(self):
        go = self._fixture(expiration_time=lambda: 0.5)
        eq_(go(1, 2), (1, 1, 2))
        eq_(go(3, 4), (2, 3, 4))
        eq_(go(1, 2), (1, 1, 2))
        time.sleep(0.3)
        eq_(go(1, 2), (1, 1, 2))
        time.sleep(0.3)
        eq_(go(1, 2), (3, 1, 2))

    def test_decorator_expire_callable_zero(self):
        go = self._fixture(expiration_time=lambda: 0)
        eq_(go(1, 2), (1, 1, 2))
        winsleep()
        eq_(go(1, 2), (2, 1, 2))
        winsleep()
        eq_(go(1, 2), (3, 1, 2))

    def test_explicit_expire(self):
        go = self._fixture(expiration_time=1)
        eq_(go(1, 2), (1, 1, 2))
        eq_(go(3, 4), (2, 3, 4))
        eq_(go(1, 2), (1, 1, 2))
        go.invalidate(1, 2)
        eq_(go(1, 2), (3, 1, 2))

    def test_explicit_set(self):
        go = self._fixture(expiration_time=1)
        eq_(go(1, 2), (1, 1, 2))
        go.set(5, 1, 2)
        eq_(go(3, 4), (2, 3, 4))
        eq_(go(1, 2), 5)
        go.invalidate(1, 2)
        eq_(go(1, 2), (3, 1, 2))
        go.set(0, 1, 3)
        eq_(go(1, 3), 0)

    def test_explicit_get(self):
        go = self._fixture(expiration_time=1)
        eq_(go(1, 2), (1, 1, 2))
        eq_(go.get(1, 2), (1, 1, 2))
        eq_(go.get(2, 1), NO_VALUE)
        eq_(go(2, 1), (2, 2, 1))
        eq_(go.get(2, 1), (2, 2, 1))

    def test_explicit_get_multi(self):
        go = self._multi_fixture(expiration_time=1)
        eq_(go(1, 2), ["1 1", "1 2"])
        eq_(go.get(1, 2), ["1 1", "1 2"])
        eq_(go.get(3, 1), [NO_VALUE, "1 1"])
        eq_(go(3, 1), ["2 3", "1 1"])
        eq_(go.get(3, 1), ["2 3", "1 1"])

    def test_explicit_set_multi(self):
        go = self._multi_fixture(expiration_time=1)
        eq_(go(1, 2), ["1 1", "1 2"])
        eq_(go(1, 2), ["1 1", "1 2"])
        go.set({1: "1 5", 2: "1 6"})
        eq_(go(1, 2), ["1 5", "1 6"])

    def test_explicit_refresh(self):
        go = self._fixture(expiration_time=1)
        eq_(go(1, 2), (1, 1, 2))
        eq_(go.refresh(1, 2), (2, 1, 2))
        eq_(go(1, 2), (2, 1, 2))
        eq_(go(1, 2), (2, 1, 2))
        eq_(go.refresh(1, 2), (3, 1, 2))
        eq_(go(1, 2), (3, 1, 2))

    def test_explicit_refresh_multi(self):
        go = self._multi_fixture(expiration_time=1)
        eq_(go(1, 2), ["1 1", "1 2"])
        eq_(go(1, 2), ["1 1", "1 2"])
        eq_(go.refresh(1, 2), ["2 1", "2 2"])
        eq_(go(1, 2), ["2 1", "2 2"])
        eq_(go(1, 2), ["2 1", "2 2"])

    def test_decorator_key_generator(self):
        def my_key_generator(namespace, fn, **kw):
            fname = fn.__name__

            def generate_key_with_first_argument(*args):
                return fname + "_" + str(args[0])

            return generate_key_with_first_argument

        go = self._fixture(key_generator=my_key_generator)
        eq_(go(1, 2), (1, 1, 2))
        eq_(go(3, 4), (2, 3, 4))
        eq_(go(1, 3), (1, 1, 2))
        time.sleep(0.3)
        eq_(go(1, 3), (3, 1, 3))

    def test_decorator_key_generator_multi(self):
        def my_key_generator(namespace, fn, **kw):
            fname = fn.__name__

            def generate_key_with_reversed_order(*args):
                return [fname + "_" + str(a) for a in args][::-1]

            return generate_key_with_reversed_order

        go = self._multi_fixture(key_generator=my_key_generator)
        eq_(go(1, 2), ["1 1", "1 2"])
        eq_(go.get(1, 2), ["1 1", "1 2"])
        eq_(go.get(3, 1), ["1 2", NO_VALUE])
        eq_(go(3, 1), ["1 2", "2 1"])
        eq_(go.get(3, 1), ["1 2", "2 1"])


class KeyGenerationTest(TestCase):
    def _keygen_decorator(self, namespace=None, **kw):
        canary = []

        def decorate(fn):
            canary.append(util.function_key_generator(namespace, fn, **kw))
            return fn

        return decorate, canary

    def _multi_keygen_decorator(self, namespace=None, **kw):
        canary = []

        def decorate(fn):
            canary.append(
                util.function_multi_key_generator(namespace, fn, **kw)
            )
            return fn

        return decorate, canary

    def _kwarg_keygen_decorator(self, namespace=None, **kw):
        canary = []

        def decorate(fn):
            canary.append(
                util.kwarg_function_key_generator(namespace, fn, **kw)
            )
            return fn

        return decorate, canary

    def test_default_keygen_kwargs_raises_value_error(self):
        decorate, canary = self._keygen_decorator()

        @decorate
        def one(a, b):
            pass

        gen = canary[0]
        self.assertRaises(ValueError, gen, 1, b=2)

    def test_kwarg_kegen_keygen_fn(self):
        decorate, canary = self._kwarg_keygen_decorator()

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        result_key = "tests.cache.test_decorator:one|1 2"

        eq_(gen(1, 2), result_key)
        eq_(gen(1, b=2), result_key)
        eq_(gen(a=1, b=2), result_key)
        eq_(gen(b=2, a=1), result_key)

    def test_kwarg_kegen_keygen_fn_with_defaults_and_positional(self):
        decorate, canary = self._kwarg_keygen_decorator()

        @decorate
        def one(a, b=None):
            pass

        gen = canary[0]

        result_key = "tests.cache.test_decorator:one|1 2"

        eq_(gen(1, 2), result_key)
        eq_(gen(1, b=2), result_key)
        eq_(gen(a=1, b=2), result_key)
        eq_(gen(b=2, a=1), result_key)
        eq_(gen(a=1), "tests.cache.test_decorator:one|1 None")

    def test_kwarg_kegen_keygen_fn_all_defaults(self):
        decorate, canary = self._kwarg_keygen_decorator()

        @decorate
        def one(a=True, b=None):
            pass

        gen = canary[0]

        result_key = "tests.cache.test_decorator:one|1 2"

        eq_(gen(1, 2), result_key)
        eq_(gen(1, b=2), result_key)
        eq_(gen(a=1, b=2), result_key)
        eq_(gen(b=2, a=1), result_key)
        eq_(gen(a=1), "tests.cache.test_decorator:one|1 None")
        eq_(gen(1), "tests.cache.test_decorator:one|1 None")
        eq_(gen(), "tests.cache.test_decorator:one|True None")
        eq_(gen(b=2), "tests.cache.test_decorator:one|True 2")

    def test_keygen_fn(self):
        decorate, canary = self._keygen_decorator()

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        eq_(gen(1, 2), "tests.cache.test_decorator:one|1 2")
        eq_(gen(None, 5), "tests.cache.test_decorator:one|None 5")

    def test_multi_keygen_fn(self):
        decorate, canary = self._multi_keygen_decorator()

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        eq_(
            gen(1, 2),
            [
                "tests.cache.test_decorator:one|1",
                "tests.cache.test_decorator:one|2",
            ],
        )

    def test_keygen_fn_namespace(self):
        decorate, canary = self._keygen_decorator("mynamespace")

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        eq_(gen(1, 2), "tests.cache.test_decorator:one|mynamespace|1 2")
        eq_(gen(None, 5), "tests.cache.test_decorator:one|mynamespace|None 5")

    def test_kwarg_keygen_fn_namespace(self):
        decorate, canary = self._kwarg_keygen_decorator("mynamespace")

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        eq_(gen(1, 2), "tests.cache.test_decorator:one|mynamespace|1 2")
        eq_(gen(None, 5), "tests.cache.test_decorator:one|mynamespace|None 5")

    def test_key_isnt_unicode_bydefault(self):
        decorate, canary = self._keygen_decorator("mynamespace")

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        assert isinstance(gen("foo"), str)

    def test_kwarg_kwgen_key_isnt_unicode_bydefault(self):
        decorate, canary = self._kwarg_keygen_decorator("mynamespace")

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        assert isinstance(gen("foo"), str)

    def test_unicode_key(self):
        decorate, canary = self._keygen_decorator("mynamespace", to_str=str)

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        eq_(
            gen("méil", "drôle"),
            "tests.cache.test_decorator:one|mynamespace|m\xe9il dr\xf4le",
        )

    def test_unicode_key_kwarg_generator(self):
        decorate, canary = self._kwarg_keygen_decorator(
            "mynamespace", to_str=str
        )

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        eq_(
            gen("méil", "drôle"),
            "tests.cache.test_decorator:one|mynamespace|m\xe9il dr\xf4le",
        )

    def test_unicode_key_multi(self):
        decorate, canary = self._multi_keygen_decorator(
            "mynamespace", to_str=str
        )

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        eq_(
            gen("méil", "drôle"),
            [
                "tests.cache.test_decorator:one|mynamespace|m\xe9il",
                "tests.cache.test_decorator:one|mynamespace|dr\xf4le",
            ],
        )

    def test_unicode_key_by_default(self):
        decorate, canary = self._keygen_decorator("mynamespace", to_str=str)

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        assert isinstance(gen("méil"), str)

        eq_(
            gen("méil", "drôle"),
            "tests.cache.test_decorator:" "one|mynamespace|m\xe9il dr\xf4le",
        )

    def test_unicode_key_by_default_kwarg_generator(self):
        decorate, canary = self._kwarg_keygen_decorator(
            "mynamespace", to_str=str
        )

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        assert isinstance(gen("méil"), str)

        eq_(
            gen("méil", "drôle"),
            "tests.cache.test_decorator:" "one|mynamespace|m\xe9il dr\xf4le",
        )

    def test_sha1_key_mangler(self):

        decorate, canary = self._keygen_decorator()

        @decorate
        def one(a, b):
            pass

        gen = canary[0]

        key = gen(1, 2)

        eq_(
            util.sha1_mangle_key(key),
            "aead490a8ace2d69a00160f1fd8fd8a16552c24f",
        )

    def test_sha1_key_mangler_unicode_py2k(self):
        eq_(
            util.sha1_mangle_key("some_key"),
            "53def077a4264bd3183d4eb21b1f56f883e1b572",
        )

    def test_sha1_key_mangler_bytes_py3k(self):
        eq_(
            util.sha1_mangle_key(b"some_key"),
            "53def077a4264bd3183d4eb21b1f56f883e1b572",
        )


class CacheDecoratorTest(_GenericBackendFixture, TestCase):
    backend = "mock"

    def test_cache_arg(self):
        reg = self._region()

        counter = itertools.count(1)

        @reg.cache_on_arguments()
        def generate(x, y):
            return next(counter) + x + y

        eq_(generate(1, 2), 4)
        eq_(generate(2, 1), 5)
        eq_(generate(1, 2), 4)
        generate.invalidate(1, 2)
        eq_(generate(1, 2), 6)

    def test_original_fn_set(self):
        reg = self._region(backend="dogpile.cache.memory")

        counter = itertools.count(1)

        def generate(x, y):
            return next(counter) + x + y

        decorated = reg.cache_on_arguments()(generate)

        eq_(decorated.original, generate)

    def test_reentrant_call(self):
        reg = self._region(backend="dogpile.cache.memory")

        counter = itertools.count(1)

        # if these two classes get the same namespace,
        # you get a reentrant deadlock.
        class Foo(object):
            @classmethod
            @reg.cache_on_arguments(namespace="foo")
            def generate(cls, x, y):
                return next(counter) + x + y

        class Bar(object):
            @classmethod
            @reg.cache_on_arguments(namespace="bar")
            def generate(cls, x, y):
                return Foo.generate(x, y)

        eq_(Bar.generate(1, 2), 4)

    def test_multi(self):
        reg = self._region()

        counter = itertools.count(1)

        @reg.cache_multi_on_arguments()
        def generate(*args):
            return ["%d %d" % (arg, next(counter)) for arg in args]

        eq_(generate(2, 8, 10), ["2 2", "8 3", "10 1"])
        eq_(generate(2, 9, 10), ["2 2", "9 4", "10 1"])

        generate.invalidate(2)
        eq_(generate(2, 7, 10), ["2 5", "7 6", "10 1"])

        generate.set({7: 18, 10: 15})
        eq_(generate(2, 7, 10), ["2 5", 18, 15])

    def test_multi_asdict(self):
        reg = self._region()

        counter = itertools.count(1)

        @reg.cache_multi_on_arguments(asdict=True)
        def generate(*args):
            return dict(
                [(arg, "%d %d" % (arg, next(counter))) for arg in args]
            )

        eq_(generate(2, 8, 10), {2: "2 2", 8: "8 3", 10: "10 1"})
        eq_(generate(2, 9, 10), {2: "2 2", 9: "9 4", 10: "10 1"})

        generate.invalidate(2)
        eq_(generate(2, 7, 10), {2: "2 5", 7: "7 6", 10: "10 1"})

        generate.set({7: 18, 10: 15})
        eq_(generate(2, 7, 10), {2: "2 5", 7: 18, 10: 15})

        eq_(generate.refresh(2, 7), {2: "2 7", 7: "7 8"})
        eq_(generate(2, 7, 10), {2: "2 7", 10: 15, 7: "7 8"})

    def test_multi_asdict_keys_missing(self):
        reg = self._region()

        counter = itertools.count(1)

        @reg.cache_multi_on_arguments(asdict=True)
        def generate(*args):
            return dict(
                [
                    (arg, "%d %d" % (arg, next(counter)))
                    for arg in args
                    if arg != 10
                ]
            )

        eq_(generate(2, 8, 10), {2: "2 1", 8: "8 2"})
        eq_(generate(2, 9, 10), {2: "2 1", 9: "9 3"})

        assert reg.get(10) is NO_VALUE

        generate.invalidate(2)
        eq_(generate(2, 7, 10), {2: "2 4", 7: "7 5"})

        generate.set({7: 18, 10: 15})
        eq_(generate(2, 7, 10), {2: "2 4", 7: 18, 10: 15})

    def test_multi_asdict_keys_missing_existing_cache_fn(self):
        reg = self._region()

        counter = itertools.count(1)

        @reg.cache_multi_on_arguments(
            asdict=True, should_cache_fn=lambda v: not v.startswith("8 ")
        )
        def generate(*args):
            return dict(
                [
                    (arg, "%d %d" % (arg, next(counter)))
                    for arg in args
                    if arg != 10
                ]
            )

        eq_(generate(2, 8, 10), {2: "2 1", 8: "8 2"})
        eq_(generate(2, 8, 10), {2: "2 1", 8: "8 3"})
        eq_(generate(2, 8, 10), {2: "2 1", 8: "8 4"})
        eq_(generate(2, 9, 10), {2: "2 1", 9: "9 5"})

        assert reg.get(10) is NO_VALUE

        generate.invalidate(2)
        eq_(generate(2, 7, 10), {2: "2 6", 7: "7 7"})

        generate.set({7: 18, 10: 15})
        eq_(generate(2, 7, 10), {2: "2 6", 7: 18, 10: 15})

    def test_multi_namespace(self):
        reg = self._region()

        counter = itertools.count(1)

        @reg.cache_multi_on_arguments(namespace="foo")
        def generate(*args):
            return ["%d %d" % (arg, next(counter)) for arg in args]

        eq_(generate(2, 8, 10), ["2 2", "8 3", "10 1"])
        eq_(generate(2, 9, 10), ["2 2", "9 4", "10 1"])

        eq_(
            sorted(list(reg.backend._cache)),
            [
                "tests.cache.test_decorator:generate|foo|10",
                "tests.cache.test_decorator:generate|foo|2",
                "tests.cache.test_decorator:generate|foo|8",
                "tests.cache.test_decorator:generate|foo|9",
            ],
        )
        generate.invalidate(2)
        eq_(generate(2, 7, 10), ["2 5", "7 6", "10 1"])

        generate.set({7: 18, 10: 15})
        eq_(generate(2, 7, 10), ["2 5", 18, 15])

    def test_cache_preserve_sig(self):
        reg = self._region()

        def func(a, b, c=True, *args, **kwargs):
            return None

        signature = compat.inspect_getargspec(func)
        cached_func = reg.cache_on_arguments()(func)
        cached_signature = compat.inspect_getargspec(cached_func)

        self.assertEqual(signature, cached_signature)

    def test_cache_multi_preserve_sig(self):
        reg = self._region()

        def func(a, b, c=True, *args, **kwargs):
            return None, None

        signature = compat.inspect_getargspec(func)
        cached_func = reg.cache_multi_on_arguments()(func)
        cached_signature = compat.inspect_getargspec(cached_func)

        self.assertEqual(signature, cached_signature)
