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

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# Tests for experiment execution

import os
import shutil
import sys
import tempfile
import unittest

import simplejson as json
import zmq

from beat.backend.python.data import RemoteDataSource
from beat.backend.python.database import Database

from ..dock import Host
from ..utils import find_free_port
from . import prefix

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


CONFIGURATION = {
    "queue": "queue",
    "inputs": {
        "in_data": {
            "set": "double",
            "protocol": "double",
            "database": "integers_db/1",
            "output": "a",
            "path": "ec/89/e5/6e161d2cb012ef6ac8acf59bf453a6328766f90dc9baba9eb14ea23c55",
            "endpoint": "a",
            "hash": "ec89e56e161d2cb012ef6ac8acf59bf453a6328766f90dc9baba9eb14ea23c55",
            "channel": "integers",
        }
    },
    "algorithm": "v1/integers_echo/1",
    "parameters": {},
    "environment": {"name": "Python for tests", "version": "1.3.0"},
    "outputs": {
        "out_data": {
            "path": "20/61/b6/2df3c3bedd5366f4a625c5d87ffbf5a26007c46c456e9abf21b46c6681",
            "endpoint": "out_data",
            "hash": "2061b62df3c3bedd5366f4a625c5d87ffbf5a26007c46c456e9abf21b46c6681",
            "channel": "integers",
        }
    },
    "nb_slots": 1,
    "channel": "integers",
}


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


class TestDatabasesProvider(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.host = Host(raise_on_errors=False)

    def setUp(self):
        if sys.platform == "darwin":
            self.working_dir = tempfile.mkdtemp(prefix=__name__, dir="/tmp")  # nosec
            self.cache_root = tempfile.mkdtemp(prefix=__name__, dir="/tmp")  # nosec
        else:
            self.working_dir = tempfile.mkdtemp(prefix=__name__)
            self.cache_root = tempfile.mkdtemp(prefix=__name__)

        self.data_source = None
        self.client_context = None
        self.client_socket = None
        self.databases_container = None

    def tearDown(self):
        self.stop_databases_provider()

        shutil.rmtree(self.working_dir)
        shutil.rmtree(self.cache_root)

        self.working_dir = None
        self.cache_root = None
        self.data_source = None

        if self.client_socket is not None:
            self.client_socket.setsockopt(zmq.LINGER, 0)
            self.client_socket.close()
            self.client_context.destroy()

        self.host.teardown()

    def start_databases_provider(self, configuration):
        with open(os.path.join(self.working_dir, "configuration.json"), "wb") as f:
            data = json.dumps(configuration, indent=4)
            f.write(data.encode("utf-8"))

        working_prefix = os.path.join(self.working_dir, "prefix")
        if not os.path.exists(working_prefix):
            os.makedirs(working_prefix)

        input_name, input_cfg = list(configuration["inputs"].items())[0]

        database = Database(prefix, input_cfg["database"])
        database.export(working_prefix)

        view = database.view(input_cfg["protocol"], input_cfg["set"])
        view.index(os.path.join(self.cache_root, input_cfg["path"]))

        port = find_free_port()
        cmd = [
            "databases_provider",
            "--debug",
            "0.0.0.0:%i" % port,
            "/beat/prefix",
            "/beat/cache",
        ]

        databases_environment = self.host.db2docker([input_cfg["database"]])

        self.databases_container = self.host.create_container(
            databases_environment, cmd
        )

        self.databases_container.add_volume(self.working_dir, "/beat/prefix")
        self.databases_container.add_volume(
            "/tmp", os.path.join("/beat/datasets", input_cfg["database"])  # nosec
        )
        self.databases_container.add_volume(self.cache_root, "/beat/cache")

        self.databases_container.add_port(port, port, host_address=self.host.ip)

        self.host.start(self.databases_container)

        self.client_context = zmq.Context()
        self.client_socket = self.client_context.socket(zmq.PAIR)
        self.client_socket.connect("tcp://{}:{}".format(self.host.ip, port))

        dataformat_name = database.set(input_cfg["protocol"], input_cfg["set"])[
            "outputs"
        ][input_cfg["output"]]

        self.data_source = RemoteDataSource()
        self.data_source.setup(self.client_socket, input_name, dataformat_name, prefix)

    def stop_databases_provider(self):
        if self.databases_container is not None:
            self.host.kill(self.databases_container)
            self.host.wait(self.databases_container)
            self.databases_container = None

    def test_success(self):
        self.start_databases_provider(CONFIGURATION)

        self.assertEqual(len(self.data_source), 9)

        for i in range(0, 9):
            (data, start_index, end_index) = self.data_source[i]
            self.assertEqual(start_index, i)
            self.assertEqual(end_index, i)
            self.assertEqual(data.value, i + 1)
