# Copyright (c) 2013 AnsibleWorks, Inc.
# All Rights Reserved

import contextlib
import datetime
import json
import os
import shutil
import tempfile

from django.conf import settings
from django.contrib.auth.models import User
import django.test
from django.test.client import Client
from lib.main.models import *


class BaseTestMixin(object):
    '''
    Mixin with shared code for use by all test cases.
    '''

    def setUp(self):
        super(BaseTestMixin, self).setUp()
        self.object_ctr = 0
        self._temp_project_dirs = []
        self._current_auth = None
        self._user_passwords = {}

    def tearDown(self):
        super(BaseTestMixin, self).tearDown()
        for project_dir in self._temp_project_dirs:
            if os.path.exists(project_dir):
                shutil.rmtree(project_dir, True)

    @contextlib.contextmanager
    def current_user(self, user_or_username, password=None):
        try:
            if isinstance(user_or_username, User):
                username = user_or_username.username
            else:
                username = user_or_username
            password = password or self._user_passwords.get(username)
            previous_auth = self._current_auth
            if username is None:
                self._current_auth = None
            else:
                self._current_auth = (username, password)
            yield
        finally:
            self._current_auth = previous_auth

    def make_user(self, username, password=None, super_user=False):
        user = None
        password = password or username
        if super_user:
            user = User.objects.create_superuser(username, "%s@example.com", password)
        else:
            user = User.objects.create_user(username, "%s@example.com", password)
        self.assertTrue(user.auth_token)
        self._user_passwords[user.username] = password
        return user

    def make_organizations(self, created_by, count=1):
        results = []
        for x in range(0, count):
            self.object_ctr = self.object_ctr + 1
            results.append(Organization.objects.create(
                name="org%s-%s" % (x, self.object_ctr), description="org%s" % x, created_by=created_by
            ))
        return results

    def make_project(self, name, description='', created_by=None,
                     playbook_content=''):
        if not os.path.exists(settings.PROJECTS_ROOT):
            os.makedirs(settings.PROJECTS_ROOT)
        # Create temp project directory.
        project_dir = tempfile.mkdtemp(dir=settings.PROJECTS_ROOT)
        self._temp_project_dirs.append(project_dir)
        # Create temp playbook in project (if playbook content is given).
        if playbook_content:
            handle, playbook_path = tempfile.mkstemp(suffix='.yml',
                                                     dir=project_dir)
            test_playbook_file = os.fdopen(handle, 'w')
            test_playbook_file.write(playbook_content)
            test_playbook_file.close()
        return Project.objects.create(
            name=name, description=description,
            local_path=os.path.basename(project_dir), created_by=created_by,
            #scm_type='git',  default_playbook='foo.yml',
        )

    def make_projects(self, created_by, count=1, playbook_content=''):
        results = []
        for x in range(0, count):
            self.object_ctr = self.object_ctr + 1
            results.append(self.make_project(
                name="proj%s-%s" % (x, self.object_ctr),
                description="proj%s" % x,
                created_by=created_by,
                playbook_content=playbook_content,
            ))
        return results

    def check_pagination_and_size(self, data, desired_count, previous=None, next=None):
        self.assertTrue('results' in data)
        self.assertEqual(data['count'], desired_count)
        self.assertEqual(data['previous'], previous)
        self.assertEqual(data['next'], next)

    def check_list_ids(self, data, queryset, check_order=False):
        data_ids = [x['id'] for x in data['results']]
        qs_ids = queryset.values_list('pk', flat=True)
        if check_order:
            self.assertEqual(data_ids, qs_ids)
        else:
            self.assertEqual(set(data_ids), set(qs_ids))

    def setup_users(self, just_super_user=False):
        # Create a user.
        self.super_username  = 'admin'
        self.super_password  = 'admin'
        self.normal_username = 'normal'
        self.normal_password = 'normal'
        self.other_username  = 'other'
        self.other_password  = 'other'

        self.super_django_user  = self.make_user(self.super_username,  self.super_password, super_user=True)

        if not just_super_user:

            self.normal_django_user = self.make_user(self.normal_username, self.normal_password, super_user=False)
            self.other_django_user  = self.make_user(self.other_username,  self.other_password, super_user=False)

    def get_super_credentials(self):
        return (self.super_username, self.super_password)

    def get_normal_credentials(self):
        return (self.normal_username, self.normal_password)

    def get_other_credentials(self):
        return (self.other_username, self.other_password)

    def get_invalid_credentials(self):
        return ('random', 'combination')
        
    def _generic_rest(self, url, data=None, expect=204, auth=None, method=None):
        assert method is not None
        method_name = method.lower()
        if method_name not in ('options', 'head', 'get', 'delete'):
            assert data is not None
        client = Client()
        auth = auth or self._current_auth
        if auth:
            if isinstance(auth, (list, tuple)):
                client.login(username=auth[0], password=auth[1])
            elif isinstance(auth, basestring):
                client = Client(HTTP_AUTHORIZATION='Token %s' % auth)
        method = getattr(client, method_name)
        response = None
        if data is not None:
            response = method(url, json.dumps(data), 'application/json')
        else:
            response = method(url)

        if response.status_code == 500 and expect != 500:
            assert False, "Failed: %s" % response.content
        if expect is not None:
            assert response.status_code == expect, "expected status %s, got %s for url=%s as auth=%s: %s" % (expect, response.status_code, url, auth, response.content)
        if method_name == 'head':
            self.assertFalse(response.content)
        if response.status_code not in [ 202, 204, 405, 409 ] and method_name != 'head' and response.content:
            # no JSON responses in these at least for now, 409 should probably return some (FIXME)
            return json.loads(response.content)
        else:
            return None

    def options(self, url, expect=200, auth=None):
        return self._generic_rest(url, data=None, expect=expect, auth=auth, method='options')

    def head(self, url, expect=200, auth=None):
        return self._generic_rest(url, data=None, expect=expect, auth=auth, method='head')
 
    def get(self, url, expect=200, auth=None):
        return self._generic_rest(url, data=None, expect=expect, auth=auth, method='get')

    def post(self, url, data, expect=204, auth=None):
        return self._generic_rest(url, data=data, expect=expect, auth=auth, method='post')

    def put(self, url, data, expect=200, auth=None):
        return self._generic_rest(url, data=data, expect=expect, auth=auth, method='put')

    def patch(self, url, data, expect=200, auth=None):
        return self._generic_rest(url, data=data, expect=expect, auth=auth, method='patch')

    def delete(self, url, expect=201, auth=None):
        return self._generic_rest(url, data=None, expect=expect, auth=auth, method='delete')

    def get_urls(self, collection_url, auth=None):
        # TODO: this test helper function doesn't support pagination
        data = self.get(collection_url, expect=200, auth=auth)
        return [item['url'] for item in data['results']]

class BaseTest(BaseTestMixin, django.test.TestCase):
    '''
    Base class for unit tests.
    '''

class BaseTransactionTest(BaseTestMixin, django.test.TransactionTestCase):
    '''
    Base class for tests requiring transactions (or where the test database
    needs to be accessed by subprocesses).
    '''