# -*- coding: utf-8 -*-

# Unit tests for cache framework
# Uses whatever cache backend is set in the test settings file.

import os
import shutil
import tempfile
import time
import unittest

from django.core.cache import cache
from django.core.cache.backends.filebased import CacheClass as FileCache
from django.http import HttpResponse
from django.utils.cache import patch_vary_headers
from django.utils.hashcompat import md5_constructor

# functions/classes for complex data type tests
def f():
    return 42
class C:
    def m(n):
        return 24

class Cache(unittest.TestCase):
    def test_simple(self):
        # simple set/get
        cache.set("key", "value")
        self.assertEqual(cache.get("key"), "value")

    def test_add(self):
        # test add (only add if key isn't already in cache)
        cache.add("addkey1", "value")
        result = cache.add("addkey1", "newvalue")
        self.assertEqual(result, False)
        self.assertEqual(cache.get("addkey1"), "value")

    def test_non_existent(self):
        # get with non-existent keys
        self.assertEqual(cache.get("does_not_exist"), None)
        self.assertEqual(cache.get("does_not_exist", "bang!"), "bang!")

    def test_get_many(self):
        # get_many
        cache.set('a', 'a')
        cache.set('b', 'b')
        cache.set('c', 'c')
        cache.set('d', 'd')
        self.assertEqual(cache.get_many(['a', 'c', 'd']), {'a' : 'a', 'c' : 'c', 'd' : 'd'})
        self.assertEqual(cache.get_many(['a', 'b', 'e']), {'a' : 'a', 'b' : 'b'})

    def test_delete(self):
        # delete
        cache.set("key1", "spam")
        cache.set("key2", "eggs")
        self.assertEqual(cache.get("key1"), "spam")
        cache.delete("key1")
        self.assertEqual(cache.get("key1"), None)
        self.assertEqual(cache.get("key2"), "eggs")

    def test_has_key(self):
        # has_key
        cache.set("hello1", "goodbye1")
        self.assertEqual(cache.has_key("hello1"), True)
        self.assertEqual(cache.has_key("goodbye1"), False)

    def test_in(self):
        cache.set("hello2", "goodbye2")
        self.assertEqual("hello2" in cache, True)
        self.assertEqual("goodbye2" in cache, False)

    def test_data_types(self):
        stuff = {
            'string'    : 'this is a string',
            'int'       : 42,
            'list'      : [1, 2, 3, 4],
            'tuple'     : (1, 2, 3, 4),
            'dict'      : {'A': 1, 'B' : 2},
            'function'  : f,
            'class'     : C,
        }
        cache.set("stuff", stuff)
        self.assertEqual(cache.get("stuff"), stuff)

    def test_expiration(self):
        cache.set('expire1', 'very quickly', 1)
        cache.set('expire2', 'very quickly', 1)
        cache.set('expire3', 'very quickly', 1)

        time.sleep(2)
        self.assertEqual(cache.get("expire1"), None)

        cache.add("expire2", "newvalue")
        self.assertEqual(cache.get("expire2"), "newvalue")
        self.assertEqual(cache.has_key("expire3"), False)

    def test_unicode(self):
        stuff = {
            u'ascii': u'ascii_value',
            u'unicode_ascii': u'Iñtërnâtiônàlizætiøn1',
            u'Iñtërnâtiônàlizætiøn': u'Iñtërnâtiônàlizætiøn2',
            u'ascii': {u'x' : 1 }
            }
        for (key, value) in stuff.items():
            cache.set(key, value)
            self.assertEqual(cache.get(key), value)


class FileBasedCacheTests(unittest.TestCase):
    """
    Specific test cases for the file-based cache.
    """
    def setUp(self):
        self.dirname = tempfile.mktemp()
        os.mkdir(self.dirname)
        self.cache = FileCache(self.dirname, {})

    def tearDown(self):
        shutil.rmtree(self.dirname)

    def test_hashing(self):
        """Test that keys are hashed into subdirectories correctly"""
        self.cache.set("foo", "bar")
        keyhash = md5_constructor("foo").hexdigest()
        keypath = os.path.join(self.dirname, keyhash[:2], keyhash[2:4], keyhash[4:])
        self.assert_(os.path.exists(keypath))

    def test_subdirectory_removal(self):
        """
        Make sure that the created subdirectories are correctly removed when empty.
        """
        self.cache.set("foo", "bar")
        keyhash = md5_constructor("foo").hexdigest()
        keypath = os.path.join(self.dirname, keyhash[:2], keyhash[2:4], keyhash[4:])
        self.assert_(os.path.exists(keypath))

        self.cache.delete("foo")
        self.assert_(not os.path.exists(keypath))
        self.assert_(not os.path.exists(os.path.dirname(keypath)))
        self.assert_(not os.path.exists(os.path.dirname(os.path.dirname(keypath))))

class CacheUtils(unittest.TestCase):
    """TestCase for django.utils.cache functions."""

    def test_patch_vary_headers(self):
        headers = (
            # Initial vary, new headers, resulting vary.
            (None, ('Accept-Encoding',), 'Accept-Encoding'),
            ('Accept-Encoding', ('accept-encoding',), 'Accept-Encoding'),
            ('Accept-Encoding', ('ACCEPT-ENCODING',), 'Accept-Encoding'),
            ('Cookie', ('Accept-Encoding',), 'Cookie, Accept-Encoding'),
            ('Cookie, Accept-Encoding', ('Accept-Encoding',), 'Cookie, Accept-Encoding'),
            ('Cookie, Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
            (None, ('Accept-Encoding', 'COOKIE'), 'Accept-Encoding, COOKIE'),
            ('Cookie,     Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
            ('Cookie    ,     Accept-Encoding', ('Accept-Encoding', 'cookie'), 'Cookie, Accept-Encoding'),
        )
        for initial_vary, newheaders, resulting_vary in headers:
            response = HttpResponse()
            if initial_vary is not None:
                response['Vary'] = initial_vary
            patch_vary_headers(response, newheaders)
            self.assertEqual(response['Vary'], resulting_vary)


if __name__ == '__main__':
    unittest.main()