import json
import multiprocessing
import sys
import unittest
from datetime import datetime
from os.path import dirname

BASE_DIR = dirname(dirname(__file__))
sys.path.insert(0, BASE_DIR)

from main import (
    accumulated_specs,
    remaining_resources,
    VmPool,
    main,
)

from config import etcd_client


class TestFunctions(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.client = etcd_client
        cls.host_prefix = "/test/host"
        cls.vm_prefix = "/test/vm"

        # These deletion could also be in
        # tearDown() but it is more appropriate here
        # as it enable us to check the ETCD store
        # even after test is run
        cls.client.client.delete_prefix(cls.host_prefix)
        cls.client.client.delete_prefix(cls.vm_prefix)
        cls.create_hosts(cls)
        cls.create_vms(cls)

        cls.p = multiprocessing.Process(
            target=main, args=[cls.vm_prefix, cls.host_prefix]
        )
        cls.p.start()

    @classmethod
    def tearDownClass(cls):
        cls.p.terminate()

    def create_hosts(self):
        host1 = {
            "cpu": 32,
            "ram": 128,
            "hdd": 1024,
            "sdd": 0,
            "status": "ALIVE",
            "last_heartbeat": datetime.utcnow().isoformat(),
        }
        host2 = {
            "cpu": 16,
            "ram": 64,
            "hdd": 512,
            "sdd": 0,
            "status": "ALIVE",
            "last_heartbeat": datetime.utcnow().isoformat(),
        }

        host3 = {
            "cpu": 16,
            "ram": 32,
            "hdd": 256,
            "sdd": 256,
            "status": "ALIVE",
            "last_heartbeat": datetime.utcnow().isoformat(),
        }
        with self.client.client.lock("lock"):
            self.client.put(f"{self.host_prefix}/1", host1, value_in_json=True)
            self.client.put(f"{self.host_prefix}/2", host2, value_in_json=True)
            self.client.put(f"{self.host_prefix}/3", host3, value_in_json=True)

    def create_vms(self):
        vm1 = json.dumps(
            {
                "owner": "meow",
                "specs": {"cpu": 4, "ram": 8, "hdd": 100, "sdd": 256},
                "hostname": "",
                "status": "REQUESTED_NEW",
            }
        )
        vm2 = json.dumps(
            {
                "owner": "meow",
                "specs": {"cpu": 16, "ram": 64, "hdd": 512, "sdd": 0},
                "hostname": "",
                "status": "REQUESTED_NEW",
            }
        )
        vm3 = json.dumps(
            {
                "owner": "meow",
                "specs": {"cpu": 16, "ram": 32, "hdd": 128, "sdd": 0},
                "hostname": "",
                "status": "REQUESTED_NEW",
            }
        )
        vm4 = json.dumps(
            {
                "owner": "meow",
                "specs": {"cpu": 16, "ram": 64, "hdd": 512, "sdd": 0},
                "hostname": "",
                "status": "REQUESTED_NEW",
            }
        )
        vm5 = json.dumps(
            {
                "owner": "meow",
                "specs": {"cpu": 2, "ram": 2, "hdd": 10, "sdd": 0},
                "hostname": "",
                "status": "REQUESTED_NEW",
            }
        )
        vm6 = json.dumps(
            {
                "owner": "meow",
                "specs": {"cpu": 10, "ram": 22, "hdd": 146, "sdd": 0},
                "hostname": "",
                "status": "REQUESTED_NEW",
            }
        )
        vm7 = json.dumps(
            {
                "owner": "meow",
                "specs": {"cpu": 10, "ram": 22, "hdd": 146, "sdd": 0},
                "hostname": "",
                "status": "REQUESTED_NEW",
            }
        )
        self.client.put(f"{self.vm_prefix}/1", vm1)
        self.client.put(f"{self.vm_prefix}/2", vm2)
        self.client.put(f"{self.vm_prefix}/3", vm3)
        self.client.put(f"{self.vm_prefix}/4", vm4)
        self.client.put(f"{self.vm_prefix}/5", vm5)
        self.client.put(f"{self.vm_prefix}/6", vm6)
        self.client.put(f"{self.vm_prefix}/7", vm7)

    def test_accumulated_specs(self):
        vms = [
            {"ssd": 10, "cpu": 4, "ram": 8},
            {"hdd": 10, "cpu": 4, "ram": 8},
            {"cpu": 8, "ram": 32},
        ]
        self.assertEqual(
            accumulated_specs(vms), {"ssd": 10, "cpu": 16, "ram": 48, "hdd": 10}
        )

    def test_remaining_resources(self):
        host_specs = {"ssd": 10, "cpu": 16, "ram": 48, "hdd": 10}
        vms_specs = {"ssd": 10, "cpu": 32, "ram": 12, "hdd": 0}
        resultant_specs = {"ssd": 0, "cpu": -16, "ram": 36, "hdd": 10}
        self.assertEqual(remaining_resources(host_specs, vms_specs),
                         resultant_specs)

    def test_vmpool(self):
        self.p.join(1)
        vm_pool = VmPool(self.client, self.vm_prefix)

        # vm_pool by host
        actual = vm_pool.by_host(vm_pool.vms, f"{self.host_prefix}/3")
        ground_truth = [
            (
                f"{self.vm_prefix}/1",
                {
                    "owner": "meow",
                    "specs": {"cpu": 4, "ram": 8, "hdd": 100, "sdd": 256},
                    "hostname": f"{self.host_prefix}/3",
                    "status": "SCHEDULED_DEPLOY",
                },
            )
        ]
        self.assertEqual(actual[0], ground_truth[0])

        # vm_pool by status
        actual = vm_pool.by_status(vm_pool.vms, "REQUESTED_NEW")
        ground_truth = [
            (
                f"{self.vm_prefix}/7",
                {
                    "owner": "meow",
                    "specs": {"cpu": 10, "ram": 22, "hdd": 146, "sdd": 0},
                    "hostname": "",
                    "status": "REQUESTED_NEW",
                },
            )
        ]
        self.assertEqual(actual[0], ground_truth[0])

        # vm_pool by except status
        actual = vm_pool.except_status(vm_pool.vms, "SCHEDULED_DEPLOY")
        ground_truth = [
            (
                f"{self.vm_prefix}/7",
                {
                    "owner": "meow",
                    "specs": {"cpu": 10, "ram": 22, "hdd": 146, "sdd": 0},
                    "hostname": "",
                    "status": "REQUESTED_NEW",
                },
            )
        ]
        self.assertEqual(actual[0], ground_truth[0])


if __name__ == "__main__":
    unittest.main()