#!/usr/bin/env python
# vim: set fileencoding=utf-8 :

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# Tests for experiment execution

import multiprocessing
import os
import queue
import unittest

import simplejson as json
import zmq
from flaky import flaky

from ..bcp import broker
from ..bcp import worker
from ..bcpapi import BCP
from ..bcpapi.client import BeatComputationClient
from ..bcpapi.execution import ExecutionProcess
from ..bcpapi.processor import BeatComputationProcessor
from ..database import Database
from ..dock import Host
from ..utils import find_free_port
from . import VERBOSE_BCP_LOGGING
from . import prefix
from . import tmp_prefix

# ----------------------------------------------------------


CONFIGURATION1 = {
    "queue": "queue",
    "inputs": {
        "in": {
            "set": "double",
            "protocol": "double",
            "database": "integers_db/1",
            "output": "a",
            "path": "ec/89/e5/6e161d2cb012ef6ac8acf59bf453a6328766f90dc9baba9eb14ea23c55.db",
            "endpoint": "a",
            "hash": "ec89e56e161d2cb012ef6ac8acf59bf453a6328766f90dc9baba9eb14ea23c55",
            "channel": "integers",
        }
    },
    "algorithm": "legacy/echo/1",
    "parameters": {},
    "environment": {"name": "Python for tests", "version": "1.3.0"},
    "outputs": {
        "out": {
            "path": "20/61/b6/2df3c3bedd5366f4a625c5d87ffbf5a26007c46c456e9abf21b46c6681",
            "endpoint": "out",
            "hash": "2061b62df3c3bedd5366f4a625c5d87ffbf5a26007c46c456e9abf21b46c6681",
            "channel": "integers",
        }
    },
    "nb_slots": 1,
    "channel": "integers",
}


# ----------------------------------------------------------


CONFIGURATION2 = {
    "queue": "queue",
    "inputs": {
        "in": {
            "set": "double",
            "protocol": "double",
            "database": "integers_db/1",
            "output": "a",
            "path": "ec/89/e5/6e161d2cb012ef6ac8acf59bf453a6328766f90dc9baba9eb14ea23c55.db",
            "endpoint": "a",
            "hash": "ec89e56e161d2cb012ef6ac8acf59bf453a6328766f90dc9baba9eb14ea23c55",
            "channel": "integers",
        }
    },
    "algorithm": "legacy/echo/1",
    "parameters": {},
    "environment": {"name": "Python for tests", "version": "1.3.0"},
    "outputs": {
        "out": {
            "path": "40/61/b6/2df3c3bedd5366f4a625c5d87ffbf5a26007c46c456e9abf21b46c6681",
            "endpoint": "out",
            "hash": "4061b62df3c3bedd5366f4a625c5d87ffbf5a26007c46c456e9abf21b46c6681",
            "channel": "integers",
        }
    },
    "nb_slots": 1,
    "channel": "integers",
}


# ----------------------------------------------------------


DEFAULT_MAX_ITERATION_COUNT = 30


# ----------------------------------------------------------


class ZMQBrokerProcess(multiprocessing.Process):
    def __init__(self, port, verbose, callbacks=None):
        super(ZMQBrokerProcess, self).__init__()
        self.port = port
        self.verbose = verbose
        self.callbacks = callbacks

    def run(self):
        return broker.run(self.port, verbose=self.verbose, callbacks=self.callbacks)


class ZMQWorkerProcess(multiprocessing.Process):
    def __init__(
        self, address, name, verbose, use_docker=False, docker_images_cache=None
    ):
        super(ZMQWorkerProcess, self).__init__()
        self.broker_address = address
        self.service_name = name
        self.verbose = verbose
        self.use_docker = use_docker
        self.docker_images_cache = None

    def run(self):
        return worker.run(
            self.broker_address,
            service_name=self.service_name,
            verbose=self.verbose,
            prefix=prefix,
            cache=tmp_prefix,
            use_docker=self.use_docker,
            docker_images_cache=self.docker_images_cache,
        )


# ----------------------------------------------------------


class ExecutionTestCase(unittest.TestCase):
    def setUp(self):
        self.MAX_ITERATION_COUNT = int(
            os.environ.get("BPC_MAX_ITERATION_COUNT", DEFAULT_MAX_ITERATION_COUNT)
        )

    def prepare_databases(self, configuration):
        for _, input_cfg in configuration["inputs"].items():
            database = Database(prefix, input_cfg["database"])
            view = database.view(input_cfg["protocol"], input_cfg["set"])
            view.index(os.path.join(tmp_prefix, input_cfg["path"]))


class TestBroker(unittest.TestCase):
    def __on_ready(self, name):
        self.queue.put("ready")

    def __on_gone(self, name):
        self.queue.put("gone")

    def setUp(self):
        self.queue = multiprocessing.Queue()

    def test_callback(self):
        worker_name = b"test_worker"

        port = find_free_port()
        broker_address = "tcp://localhost:{}".format(port)

        broker_p = ZMQBrokerProcess(
            port, VERBOSE_BCP_LOGGING, (self.__on_ready, self.__on_gone)
        )
        broker_p.start()

        worker = ZMQWorkerProcess(broker_address, worker_name, VERBOSE_BCP_LOGGING)
        worker.start()
        worker.join(2)  # Give the worker enough time to announce itself
        worker.terminate()
        worker.join()

        max_rounds = 5
        queue_messages = []
        while max_rounds > 0 and len(queue_messages) < 2:
            max_rounds -= 1
            try:
                message = self.queue.get(block=True, timeout=5)
            except queue.Empty:
                pass
            else:
                queue_messages.append(message)

        broker_p.terminate()
        broker_p.join()

        self.assertEqual(len(queue_messages), 2)
        self.assertEqual(queue_messages[0], "ready")
        self.assertEqual(queue_messages[1], "gone")


class TestBCP(ExecutionTestCase):
    use_docker = False
    docker_images_cache = None

    def setUp(self):
        super().setUp()

        self.worker_name = b"test_worker"

        port = find_free_port()
        broker_address = "tcp://localhost:{}".format(port)

        self.broker_p = ZMQBrokerProcess(port, VERBOSE_BCP_LOGGING)
        self.broker_p.start()

        self.worker = ZMQWorkerProcess(
            broker_address,
            self.worker_name,
            VERBOSE_BCP_LOGGING,
            self.use_docker,
            self.docker_images_cache,
        )
        self.worker.start()

        self.client = BeatComputationClient(broker_address, VERBOSE_BCP_LOGGING)

    def tearDown(self):
        self.worker.terminate()
        self.worker.join()
        self.broker_p.terminate()
        self.broker_p.join()
        self.client = None

    def test_cancel_unknown(self):
        request = [BCP.BCPE_CANCEL, b"1"]
        self.client.send(self.worker_name, request)

        reply = None
        iterations = 0
        while reply is None and iterations < self.MAX_ITERATION_COUNT:
            try:
                reply = self.client.recv()
            except KeyboardInterrupt:
                break
            else:
                iterations += 1

        self.assertTrue(iterations < self.MAX_ITERATION_COUNT)
        self.assertEqual(reply[1], BCP.BCPP_ERROR)
        self.assertEqual(reply[2], b"Unknown job: 1")

    def test_cancel(self):
        self.prepare_databases(CONFIGURATION1)
        job_id = b"1"

        request = [BCP.BCPE_EXECUTE, job_id, json.dumps(CONFIGURATION1).encode("utf-8")]
        self.client.send(self.worker_name, request)

        request = [BCP.BCPE_CANCEL, job_id]
        self.client.send(self.worker_name, request)

        messages = []
        iterations = 0
        while len(messages) < 3 and iterations < self.MAX_ITERATION_COUNT:
            try:
                reply = self.client.recv()
            except KeyboardInterrupt:
                break
            else:
                if reply:
                    messages.append(reply)
                iterations += 1

        self.assertTrue(iterations < self.MAX_ITERATION_COUNT)
        self.assertEqual(messages[0][1], BCP.BCPP_JOB_RECEIVED)
        self.assertEqual(messages[0][2], job_id)
        self.assertEqual(messages[1][1], BCP.BCPP_JOB_STARTED)
        self.assertEqual(messages[1][2], job_id)
        self.assertEqual(messages[2][1], BCP.BCPP_JOB_CANCELLED)
        self.assertEqual(messages[2][2], job_id)

    @flaky(max_runs=3)
    def test_execute(self):
        self.prepare_databases(CONFIGURATION1)
        job_id = b"1"

        request = [BCP.BCPE_EXECUTE, job_id, json.dumps(CONFIGURATION1).encode("utf-8")]
        self.client.send(self.worker_name, request)

        messages = []
        iterations = 0
        while len(messages) < 3 and iterations < self.MAX_ITERATION_COUNT:
            try:
                reply = self.client.recv()
            except KeyboardInterrupt:
                break
            else:
                if reply:
                    messages.append(reply)
                iterations += 1

        self.assertTrue(iterations < self.MAX_ITERATION_COUNT)
        self.assertEqual(messages[0][1], BCP.BCPP_JOB_RECEIVED)
        self.assertEqual(messages[0][2], job_id)
        self.assertEqual(messages[1][1], BCP.BCPP_JOB_STARTED)
        self.assertEqual(messages[1][2], job_id)
        self.assertEqual(messages[2][1], BCP.BCPP_JOB_DONE)
        self.assertEqual(messages[2][2], job_id)
        self.assertEqual(len(messages[2]), 4)


class TestBCPDocker(TestBCP):
    use_docker = True

    @classmethod
    def setUpClass(cls):
        cls.docker_images_cache = os.path.join(tmp_prefix, "docker_images_cache.json")
        cls.host = Host(images_cache=cls.docker_images_cache, raise_on_errors=False)


class TestExecutionProcess(ExecutionTestCase):
    REMOTE_ADDRESS = "ipc://execution_feed"

    def tearDown(self):
        os.remove(self.REMOTE_ADDRESS.split("//")[1])

    def setup_process(self):
        self.prepare_databases(CONFIGURATION1)
        process = ExecutionProcess(
            self.REMOTE_ADDRESS,
            b"1",
            prefix,
            CONFIGURATION1,
            tmp_prefix,
            VERBOSE_BCP_LOGGING,
        )
        process.start()
        return process

    def test_execution_process(self):
        ctx = zmq.Context()
        socket = ctx.socket(zmq.ROUTER)
        socket.linger = 0
        socket.bind(self.REMOTE_ADDRESS)

        poller = zmq.Poller()
        poller.register(socket, zmq.POLLIN)

        process = self.setup_process()

        done = False
        iterations = 0
        messages = []

        while True and iterations < self.MAX_ITERATION_COUNT:
            try:
                items = poller.poll(1000)
            except KeyboardInterrupt:
                break

            if items:
                msg = socket.recv_multipart()
                messages.append(msg)

                result = msg[1]
                if result == BCP.BCPP_JOB_DONE:
                    done = True
                    break
                elif result in [BCP.BCPP_JOB_ERROR, BCP.BCPP_ERROR]:
                    break
            iterations += 1

        process.terminate()
        process.join()
        ctx.destroy()

        self.assertTrue(iterations < self.MAX_ITERATION_COUNT)
        self.assertTrue(done)
        self.assertEqual(process.queue.get(), "started")
        self.assertEqual(messages[0][1], BCP.BCPP_JOB_DONE)

    def test_processor(self):
        poller = zmq.Poller()
        processor = BeatComputationProcessor(
            poller, self.REMOTE_ADDRESS, VERBOSE_BCP_LOGGING
        )

        process = self.setup_process()

        done = False
        iterations = 0

        messages = []

        while True and iterations < self.MAX_ITERATION_COUNT:
            try:
                items = poller.poll(1000)
            except KeyboardInterrupt:
                break

            if items:
                msg = processor.process()
                messages.append(msg)

                result = msg[1]
                if result == BCP.BCPP_JOB_DONE:
                    done = True
                    break
                elif result in [BCP.BCPP_JOB_ERROR, BCP.BCPP_ERROR]:
                    break
            iterations += 1

        process.terminate()
        process.join()

        self.assertTrue(iterations < self.MAX_ITERATION_COUNT)
        self.assertTrue(done)
        self.assertEqual(process.queue.get(), "started")
        self.assertEqual(messages[0][1], BCP.BCPP_JOB_DONE)
