import datetime
import os

from django.conf import settings
from django.test import TestCase

from .. import models


class TestGraphs(TestCase):
    def setUp(self):
        self.rrd_file = "test.rrd"
        try:
            os.remove(os.path.join(settings.RRD_DB_PATH, self.rrd_file))
        except FileNotFoundError:
            pass

    def tearDown(self):
        try:
            os.remove(os.path.join(settings.RRD_DB_PATH, self.rrd_file))
        except FileNotFoundError:
            pass

    def test_generate_at_ds_update(self):
        ds = models.DataSource.objects.create(
            topic="test",
            path=self.rrd_file,
        )
        graph = models.Graph.objects.create(
            title="Test Graph",
            path="test/test.png",
        )
        graph.data_sources.add(ds)
        graph.save()
        now = datetime.datetime.now()
        ts = int(now.timestamp())
        ds.update(ts, 10)
        stat = os.stat(os.path.join(settings.RRD_GRAPH_PATH, "test/test.png"))
        self.assertGreaterEqual(stat.st_mtime, now.timestamp())