import datetime
import os
import string
import random
from functools import wraps

from django.conf import settings
from django.contrib.auth import BACKEND_SESSION_KEY, SESSION_KEY, get_user_model
from django.contrib.sessions.backends.db import SessionStore
from django.core.urlresolvers import reverse
from django.test import LiveServerTestCase, TestCase
from orm.api import Api
from selenium.webdriver.firefox.webdriver import WebDriver
from xvfbwrapper import Xvfb

from orchestra.apps.accounts.models import Account


def random_ascii(length):
    return ''.join([random.choice(string.hexdigits) for i in range(0, length)]).lower()


class AppDependencyMixin(object):
    DEPENDENCIES = ()
    
    @classmethod
    def setUpClass(cls):
        current_app = cls.__module__.split('.tests.')[0]
        INSTALLED_APPS = (
            'orchestra',
            'orchestra.apps.accounts',
            current_app
        )
        INSTALLED_APPS += cls.DEPENDENCIES
        INSTALLED_APPS += (
            # Third-party apps
            'south',
            'django_extensions',
            'djcelery',
            'djcelery_email',
            'fluent_dashboard',
            'admin_tools',
            'admin_tools.theming',
            'admin_tools.menu',
            'admin_tools.dashboard',
            'rest_framework',
            # Django.contrib
            'django.contrib.auth',
            'django.contrib.contenttypes',
            'django.contrib.sessions',
            'django.contrib.messages',
            'django.contrib.staticfiles',
            'django.contrib.admin',
        )
        settings.INSTALLED_APPS = INSTALLED_APPS
        super(AppDependencyMixin, cls).setUpClass()


class BaseTestCase(TestCase, AppDependencyMixin):
    def create_account(self, username='', superuser=False):
        if not username:
            username = '%s_superaccount' % random_ascii(5)
        password = 'orchestra'
        if superuser:
            return Account.objects.create_superuser(username, password=password, email='orchestra@orchestra.org')
        return Account.objects.create_user(username, password=password, email='orchestra@orchestra.org')


class BaseLiveServerTestCase(AppDependencyMixin, LiveServerTestCase):
    @classmethod
    def setUpClass(cls):
        # Avoid problems with the overlaping menu when clicking
        settings.ADMIN_TOOLS_MENU = 'admin_tools.menu.Menu'
        cls.vdisplay = Xvfb()
        cls.vdisplay.start()
        cls.selenium = WebDriver()
        super(BaseLiveServerTestCase, cls).setUpClass()
    
    @classmethod
    def tearDownClass(cls):
        cls.selenium.quit()
        cls.vdisplay.stop()
        super(BaseLiveServerTestCase, cls).tearDownClass()
    
    def create_account(self, username='', superuser=False):
        if not username:
            username = '%s_superaccount' % random_ascii(5)
        password = 'orchestra'
        self.account_password = password
        if superuser:
            return Account.objects.create_superuser(username, password=password, email='orchestra@orchestra.org')
        return Account.objects.create_user(username, password=password, email='orchestra@orchestra.org')
    
    def setUp(self):
        super(BaseLiveServerTestCase, self).setUp()
        self.rest = Api(self.live_server_url + '/api/')
        self.rest.enable_logging()
        self.account = self.create_account(superuser=True)
    
    def admin_login(self):
        session = SessionStore()
        session[SESSION_KEY] = self.account_id
        session[BACKEND_SESSION_KEY] = settings.AUTHENTICATION_BACKENDS[0]
        session.save()
        ## to set a cookie we need to first visit the domain.
        self.selenium.get(self.live_server_url + '/admin/')
        self.selenium.add_cookie(dict(
            name=settings.SESSION_COOKIE_NAME,
            value=session.session_key, #
            path='/',
        ))
    
    def rest_login(self):
        self.rest.login(username=self.account.username, password=self.account_password)
    
    def take_screenshot(self):
        timestamp = datetime.datetime.now().isoformat().replace(':', '')
        filename = 'screenshot_%s_%s.png' % (self.id(), timestamp)
        path = '/home/orchestra/snapshots'
        self.selenium.save_screenshot(os.path.join(path, filename))
    
    def admin_delete(self, obj):
        opts = obj._meta
        app_label, model_name = opts.app_label, opts.model_name
        delete = reverse('admin:%s_%s_delete' % (app_label, model_name), args=(obj.pk,))
        url = self.live_server_url + delete
        self.selenium.get(url)
        confirmation = self.selenium.find_element_by_name('post')
        confirmation.submit()
        self.assertNotEqual(url, self.selenium.current_url)
    
    def admin_disable(self, obj):
        opts = obj._meta
        app_label, model_name = opts.app_label, opts.model_name
        change = reverse('admin:%s_%s_change' % (app_label, model_name), args=(obj.pk,))
        url = self.live_server_url + change
        self.selenium.get(url)
        is_active = self.selenium.find_element_by_id('id_is_active')
        is_active.click()
        save = self.selenium.find_element_by_name('_save')
        save.submit()
        self.assertNotEqual(url, self.selenium.current_url)
    
    def admin_change_password(self, obj, password):
        opts = obj._meta
        app_label, model_name = opts.app_label, opts.model_name
        change_password = reverse('admin:%s_%s_change_password' % (app_label, model_name), args=(obj.pk,))
        url = self.live_server_url + change_password
        self.selenium.get(url)
        
        password_field = self.selenium.find_element_by_id('id_password1')
        password_field.send_keys(password)
        password_field = self.selenium.find_element_by_id('id_password2')
        password_field.send_keys(password)
        password_field.submit()
        
        self.assertNotEqual(url, self.selenium.current_url)

def snapshot_on_error(test):
    @wraps(test)
    def inner(*args, **kwargs):
        try:
            test(*args, **kwargs)
        except:
            self = args[0]
            self.take_screenshot()
            raise
    return inner


def save_response_on_error(test):
    @wraps(test)
    def inner(*args, **kwargs):
        try:
            test(*args, **kwargs)
        except:
            self = args[0]
            timestamp = datetime.datetime.now().isoformat().replace(':', '')
            filename = '%s_%s.html' % (self.id(), timestamp)
            path = '/home/orchestra/snapshots'
            with open(os.path.join(path, filename), 'w') as dumpfile:
                dumpfile.write(self.rest.last_response.content)
            raise
    return inner