# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import asyncio
import contextlib
import glob
import inspect
import os
import shutil

import jinja2 as jinja2
import psutil
import re
import signal
import subprocess
import time

from pyignite import Client, AioClient

try:
    from contextlib import asynccontextmanager
except ImportError:
    from async_generator import asynccontextmanager


@contextlib.contextmanager
def get_client(**kwargs):
    client = Client(**kwargs)
    try:
        yield client
    finally:
        client.close()


@asynccontextmanager
async def get_client_async(**kwargs):
    client = AioClient(**kwargs)
    try:
        yield client
    finally:
        await client.close()


@contextlib.contextmanager
def get_or_create_cache(client, cache_name):
    cache = client.get_or_create_cache(cache_name)
    try:
        yield cache
    finally:
        cache.destroy()


@asynccontextmanager
async def get_or_create_cache_async(client, cache_name):
    cache = await client.get_or_create_cache(cache_name)
    try:
        yield cache
    finally:
        await cache.destroy()


def wait_for_condition(condition, interval=0.1, timeout=10, error=None):
    start = time.time()
    res = condition()

    while not res and time.time() - start < timeout:
        time.sleep(interval)
        res = condition()

    if res:
        return True

    if error is not None:
        raise Exception(error)

    return False


async def wait_for_condition_async(condition, interval=0.1, timeout=10, error=None):
    start = time.time()
    res = await condition() if inspect.iscoroutinefunction(condition) else condition()

    while not res and time.time() - start < timeout:
        await asyncio.sleep(interval)
        res = await condition() if inspect.iscoroutinefunction(condition) else condition()

    if res:
        return True

    if error is not None:
        raise Exception(error)

    return False


def is_windows():
    return os.name == "nt"


def get_test_dir():
    return os.path.dirname(os.path.realpath(__file__))


def get_ignite_dirs():
    ignite_home = os.getenv("IGNITE_HOME")
    if ignite_home is not None:
        yield ignite_home

    proj_dir = os.path.abspath(os.path.join(get_test_dir(), "..", ".."))
    yield os.path.join(proj_dir, "ignite")
    yield os.path.join(proj_dir, "incubator_ignite")


def get_ignite_runner():
    ext = ".bat" if is_windows() else ".sh"
    for ignite_dir in get_ignite_dirs():
        runner = os.path.join(ignite_dir, "bin", "ignite" + ext)
        print("Probing Ignite runner at '{0}'...".format(runner))
        if os.path.exists(runner):
            return runner

    raise Exception(f"Ignite not found. IGNITE_HOME {os.getenv('IGNITE_HOME')}")


def get_ignite_config_path(use_ssl=False):
    if use_ssl:
        file_name = "ignite-config-ssl.xml"
    else:
        file_name = "ignite-config.xml.jinja2"

    return os.path.join(get_test_dir(), "config", file_name)


def check_server_started(idx=1):
    pattern = re.compile('^Topology snapshot.*')

    for log_file in get_log_files(idx):
        with open(log_file) as f:
            for line in f.readlines():
                if pattern.match(line):
                    return True

    return False


def kill_process_tree(pid):
    if is_windows():
        subprocess.call(['taskkill', '/F', '/T', '/PID', str(pid)])
    else:
        children = psutil.Process(pid).children(recursive=True)
        for child in children:
            os.kill(child.pid, signal.SIGKILL)
        os.kill(pid, signal.SIGKILL)


templateLoader = jinja2.FileSystemLoader(searchpath=os.path.join(get_test_dir(), "config"))
templateEnv = jinja2.Environment(loader=templateLoader)


def create_config_file(tpl_name, file_name, **kwargs):
    template = templateEnv.get_template(tpl_name)
    with open(os.path.join(get_test_dir(), "config", file_name), mode='w') as f:
        f.write(template.render(**kwargs))


def start_ignite(idx=1, debug=False, use_ssl=False, use_auth=False):
    clear_logs(idx)

    runner = get_ignite_runner()

    env = os.environ.copy()

    if debug:
        env["JVM_OPTS"] = "-Djava.net.preferIPv4Stack=true -Xdebug -Xnoagent -Djava.compiler=NONE " \
                          "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5005 "

    params = {'ignite_instance_idx': str(idx), 'ignite_client_port': 10800 + idx, 'use_ssl': use_ssl,
              'use_auth': use_auth}

    create_config_file('log4j.xml.jinja2', f'log4j-{idx}.xml', **params)
    create_config_file('ignite-config.xml.jinja2', f'ignite-config-{idx}.xml', **params)

    ignite_cmd = [runner, os.path.join(get_test_dir(), "config", f'ignite-config-{idx}.xml')]
    print("Starting Ignite server node:", ignite_cmd)

    srv = subprocess.Popen(ignite_cmd, env=env, cwd=get_test_dir())

    started = wait_for_condition(lambda: check_server_started(idx), timeout=30)
    if started:
        return srv

    kill_process_tree(srv.pid)
    raise Exception("Failed to start Ignite: timeout while trying to connect")


def start_ignite_gen(idx=1, use_ssl=False, use_auth=False):
    srv = start_ignite(idx, use_ssl=use_ssl, use_auth=use_auth)
    try:
        yield srv
    finally:
        kill_process_tree(srv.pid)


def get_log_files(idx=1):
    logs_pattern = os.path.join(get_test_dir(), "logs", "ignite-log-{0}*.txt".format(idx))
    return glob.glob(logs_pattern)


def clear_ignite_work_dir():
    for ignite_dir in get_ignite_dirs():
        work_dir = os.path.join(ignite_dir, 'work')
        if os.path.exists(work_dir):
            shutil.rmtree(work_dir, ignore_errors=True)


def clear_logs(idx=1):
    for f in get_log_files(idx):
        os.remove(f)