# -*- coding: utf-8 -*-
"""
Tests for the Openstack Cloud Provider
"""

from __future__ import absolute_import, print_function, unicode_literals

import logging
import os
import shutil
from time import sleep

from salt.config import cloud_config, cloud_providers_config
from salt.ext.six.moves import range
from salt.utils.yaml import safe_load
from tests.support.case import ShellCase
from tests.support.helpers import expensiveTest, random_string
from tests.support.paths import FILES
from tests.support.runtests import RUNTIME_VARS

TIMEOUT = 500

log = logging.getLogger(__name__)


@expensiveTest
class CloudTest(ShellCase):
    PROVIDER = ""
    REQUIRED_PROVIDER_CONFIG_ITEMS = tuple()
    __RE_RUN_DELAY = 30
    __RE_TRIES = 12

    @staticmethod
    def clean_cloud_dir(tmp_dir):
        """
        Clean the cloud.providers.d tmp directory
        """
        # make sure old provider configs are deleted
        if not os.path.isdir(tmp_dir):
            return
        for fname in os.listdir(tmp_dir):
            os.remove(os.path.join(tmp_dir, fname))

    def query_instances(self):
        """
        Standardize the data returned from a salt-cloud --query
        """
        return set(
            x.strip(": ")
            for x in self.run_cloud("--query")
            if x.lstrip().lower().startswith("cloud-test-")
        )

    def _instance_exists(self, instance_name=None, query=None):
        """
        :param instance_name: The name of the instance to check for in salt-cloud.
        For example this is may used when a test temporarily renames an instance
        :param query: The result of a salt-cloud --query run outside of this function
        """
        if not instance_name:
            instance_name = self.instance_name
        if not query:
            query = self.query_instances()

        log.debug('Checking for "{}" in {}'.format(instance_name, query))
        if isinstance(query, set):
            return instance_name in query
        return any(instance_name == q.strip(": ") for q in query)

    def assertInstanceExists(self, creation_ret=None, instance_name=None):
        """
        :param instance_name: Override the checked instance name, otherwise the class default will be used.
        :param creation_ret: The return value from the run_cloud() function that created the instance
        """
        if not instance_name:
            instance_name = self.instance_name

        # If it exists but doesn't show up in the creation_ret, there was probably an error during creation
        if creation_ret:
            self.assertIn(
                instance_name,
                [i.strip(": ") for i in creation_ret],
                "An error occured during instance creation:  |\n\t{}\n\t|".format(
                    "\n\t".join(creation_ret)
                ),
            )
        else:
            # Verify that the instance exists via query
            query = self.query_instances()
            for tries in range(self.__RE_TRIES):
                if self._instance_exists(instance_name, query):
                    log.debug(
                        'Instance "{}" reported after {} seconds'.format(
                            instance_name, tries * self.__RE_RUN_DELAY
                        )
                    )
                    break
                else:
                    sleep(self.__RE_RUN_DELAY)
                    query = self.query_instances()

            # Assert that the last query was successful
            self.assertTrue(
                self._instance_exists(instance_name, query),
                'Instance "{}" was not created successfully: {}'.format(
                    self.instance_name, ", ".join(query)
                ),
            )

            log.debug('Instance exists and was created: "{}"'.format(instance_name))

    def assertDestroyInstance(self, instance_name=None, timeout=None):
        if timeout is None:
            timeout = TIMEOUT
        if not instance_name:
            instance_name = self.instance_name
        log.debug('Deleting instance "{}"'.format(instance_name))
        delete_str = self.run_cloud(
            "-d {0} --assume-yes --out=yaml".format(instance_name), timeout=timeout
        )
        if delete_str:
            delete = safe_load("\n".join(delete_str))
            self.assertIn(self.profile_str, delete)
            self.assertIn(self.PROVIDER, delete[self.profile_str])
            self.assertIn(instance_name, delete[self.profile_str][self.PROVIDER])

            delete_status = delete[self.profile_str][self.PROVIDER][instance_name]
            if isinstance(delete_status, str):
                self.assertEqual(delete_status, "True")
                return
            elif isinstance(delete_status, dict):
                current_state = delete_status.get("currentState")
                if current_state:
                    if current_state.get("ACTION"):
                        self.assertIn(".delete", current_state.get("ACTION"))
                        return
                    else:
                        self.assertEqual(current_state.get("name"), "shutting-down")
                        return
        # It's not clear from the delete string that deletion was successful, ask salt-cloud after a delay
        query = self.query_instances()
        # some instances take a while to report their destruction
        for tries in range(6):
            if self._instance_exists(query=query):
                sleep(30)
                log.debug(
                    'Instance "{}" still found in query after {} tries: {}'.format(
                        instance_name, tries, query
                    )
                )
                query = self.query_instances()
        # The last query should have been successful
        self.assertNotIn(instance_name, self.query_instances())

    @property
    def instance_name(self):
        if not hasattr(self, "_instance_name"):
            # Create the cloud instance name to be used throughout the tests
            subclass = self.__class__.__name__.strip("Test")
            # Use the first three letters of the subclass, fill with '-' if too short
            self._instance_name = random_string(
                "cloud-test-{:-<3}-".format(subclass[:3]), uppercase=False
            ).lower()
        return self._instance_name

    @property
    def providers(self):
        if not hasattr(self, "_providers"):
            self._providers = self.run_cloud("--list-providers")
        return self._providers

    @property
    def provider_config(self):
        if not hasattr(self, "_provider_config"):
            self._provider_config = cloud_providers_config(
                os.path.join(
                    RUNTIME_VARS.TMP_CONF_DIR,
                    "cloud.providers.d",
                    self.PROVIDER + ".conf",
                )
            )
        return self._provider_config[self.profile_str][self.PROVIDER]

    @property
    def config(self):
        if not hasattr(self, "_config"):
            self._config = cloud_config(
                os.path.join(
                    RUNTIME_VARS.TMP_CONF_DIR,
                    "cloud.profiles.d",
                    self.PROVIDER + ".conf",
                )
            )
        return self._config

    @property
    def profile_str(self):
        return self.PROVIDER + "-config"

    def setUp(self):
        """
        Sets up the test requirements.  In child classes, define PROVIDER and REQUIRED_CONFIG_ITEMS or this will fail
        """
        super(CloudTest, self).setUp()

        if not self.PROVIDER:
            self.fail("A PROVIDER must be defined for this test")

        # check if appropriate cloud provider and profile files are present
        if self.profile_str + ":" not in self.providers:
            self.skipTest(
                "Configuration file for {0} was not found. Check {0}.conf files "
                "in tests/integration/files/conf/cloud.*.d/ to run these tests.".format(
                    self.PROVIDER
                )
            )

        missing_conf_item = []
        for att in self.REQUIRED_PROVIDER_CONFIG_ITEMS:
            if not self.provider_config.get(att):
                missing_conf_item.append(att)

        if missing_conf_item:
            self.skipTest(
                "Conf items are missing that must be provided to run these tests:  {}".format(
                    ", ".join(missing_conf_item)
                )
                + "\nCheck tests/integration/files/conf/cloud.providers.d/{0}.conf".format(
                    self.PROVIDER
                )
            )

    def _alt_names(self):
        """
        Check for an instances created alongside this test's instance that weren't cleaned up
        """
        query = self.query_instances()
        instances = set()
        for q in query:
            # Verify but this is a new name and not a shutting down ec2 instance
            if q.startswith(self.instance_name) and not q.split("-")[-1].startswith(
                "DEL"
            ):
                instances.add(q)
                log.debug(
                    'Adding "{}" to the set of instances that needs to be deleted'.format(
                        q
                    )
                )
        return instances

    def _ensure_deletion(self, instance_name=None):
        """
        Make sure that the instance absolutely gets deleted, but fail the test if it happens in the tearDown
        :return True if an instance was deleted, False if no instance was deleted; and a message
        """
        destroyed = False
        if not instance_name:
            instance_name = self.instance_name

        if self._instance_exists(instance_name):
            for tries in range(3):
                try:
                    self.assertDestroyInstance(instance_name)
                    return (
                        False,
                        'The instance "{}" was deleted during the tearDown, not the test.'.format(
                            instance_name
                        ),
                    )
                except AssertionError as e:
                    log.error(
                        'Failed to delete instance "{}". Tries: {}\n{}'.format(
                            instance_name, tries, str(e)
                        )
                    )
                if not self._instance_exists():
                    destroyed = True
                    break
                else:
                    sleep(30)

            if not destroyed:
                # Destroying instances in the tearDown is a contingency, not the way things should work by default.
                return (
                    False,
                    'The Instance "{}" was not deleted after multiple attempts'.format(
                        instance_name
                    ),
                )

        return (
            True,
            'The instance "{}" cleaned up properly after the test'.format(
                instance_name
            ),
        )

    def tearDown(self):
        """
        Clean up after tests, If the instance still exists for any reason, delete it.
        Instances should be destroyed before the tearDown, assertDestroyInstance() should be called exactly
        one time in a test for each instance created.  This is a failSafe and something went wrong
        if the tearDown is where an instance is destroyed.
        """
        success = True
        fail_messages = []
        alt_names = self._alt_names()
        for instance in alt_names:
            alt_destroyed, alt_destroy_message = self._ensure_deletion(instance)
            if not alt_destroyed:
                success = False
                fail_messages.append(alt_destroy_message)
                log.error(
                    'Failed to destroy instance "{}": {}'.format(
                        instance, alt_destroy_message
                    )
                )
        self.assertTrue(success, "\n".join(fail_messages))
        self.assertFalse(
            alt_names, "Cleanup should happen in the test, not the TearDown"
        )

    @classmethod
    def tearDownClass(cls):
        cls.clean_cloud_dir(cls.tmp_provider_dir)

    @classmethod
    def setUpClass(cls):
        # clean up before setup
        cls.tmp_provider_dir = os.path.join(
            RUNTIME_VARS.TMP_CONF_DIR, "cloud.providers.d"
        )
        cls.clean_cloud_dir(cls.tmp_provider_dir)

        # add the provider config for only the cloud we are testing
        provider_file = cls.PROVIDER + ".conf"
        shutil.copyfile(
            os.path.join(
                os.path.join(FILES, "conf", "cloud.providers.d"), provider_file
            ),
            os.path.join(os.path.join(cls.tmp_provider_dir, provider_file)),
        )
