# SPDX-FileCopyrightText: 2020 The Magma Authors.
# SPDX-FileCopyrightText: 2022 Open Networking Foundation <support@opennetworking.org>
#
# SPDX-License-Identifier: BSD-3-Clause

import unittest
import unittest.mock

import metrics_pb2
from common import metrics_export
from orc8r.protos import metricsd_pb2
from prometheus_client import (
    CollectorRegistry,
    Counter,
    Gauge,
    Histogram,
    Summary,
)


class Service303MetricTests(unittest.TestCase):
    """
    Tests for the Service303 metrics interface
    """

    def setUp(self):
        self.registry = CollectorRegistry()
        self.maxDiff = None

    def test_counter(self):
        """Test that we can track counters in Service303"""
        # Add a counter with a label to the regisry
        c = Counter(
            'process_max_fds', 'A counter', ['result'],
            registry=self.registry,
        )

        # Create two series for value1 and value2
        c.labels('success').inc(1.23)
        c.labels('failure').inc(2.34)

        # Build proto outputs
        counter1 = metrics_pb2.Counter(value=1.23)
        counter2 = metrics_pb2.Counter(value=2.34)
        metric1 = metrics_pb2.Metric(
            counter=counter1,
            timestamp_ms=1234000,
        )
        metric2 = metrics_pb2.Metric(
            counter=counter2,
            timestamp_ms=1234000,
        )
        family = metrics_pb2.MetricFamily(
            name=str(metricsd_pb2.process_max_fds),
            type=metrics_pb2.COUNTER,
        )
        metric1.label.add(
            name=str(metricsd_pb2.result),
            value='success',
        )
        metric2.label.add(
            name=str(metricsd_pb2.result),
            value='failure',
        )
        family.metric.extend([metric1, metric2])

        with unittest.mock.patch('time.time') as mock_time:
            mock_time.side_effect = lambda: 1234
            self.assertCountEqual(
                list(metrics_export.get_metrics(self.registry))[0].metric,
                family.metric,
            )

    def test_gauge(self):
        """Test that we can track gauges in Service303"""
        # Add a gauge with a label to the regisry
        c = Gauge(
            'process_max_fds', 'A gauge', ['result'],
            registry=self.registry,
        )

        # Create two series for value1 and value2
        c.labels('success').inc(1.23)
        c.labels('failure').inc(2.34)

        # Build proto outputs
        gauge1 = metrics_pb2.Gauge(value=1.23)
        gauge2 = metrics_pb2.Gauge(value=2.34)
        metric1 = metrics_pb2.Metric(
            gauge=gauge1,
            timestamp_ms=1234000,
        )
        metric2 = metrics_pb2.Metric(
            gauge=gauge2,
            timestamp_ms=1234000,
        )
        family = metrics_pb2.MetricFamily(
            name=str(metricsd_pb2.process_max_fds),
            type=metrics_pb2.GAUGE,
        )
        metric1.label.add(
            name=str(metricsd_pb2.result),
            value='success',
        )
        metric2.label.add(
            name=str(metricsd_pb2.result),
            value='failure',
        )
        family.metric.extend([metric1, metric2])

        with unittest.mock.patch('time.time') as mock_time:
            mock_time.side_effect = lambda: 1234
            self.assertCountEqual(
                list(metrics_export.get_metrics(self.registry))[0].metric,
                family.metric,
            )

    def test_summary(self):
        """Test that we can track summaries in Service303"""
        # Add a summary with a label to the regisry
        c = Summary(
            'process_max_fds', 'A summary', [
            'result',
            ], registry=self.registry,
        )
        c.labels('success').observe(1.23)
        c.labels('failure').observe(2.34)

        # Build proto outputs
        summary1 = metrics_pb2.Summary(sample_count=1, sample_sum=1.23)
        summary2 = metrics_pb2.Summary(sample_count=1, sample_sum=2.34)
        metric1 = metrics_pb2.Metric(
            summary=summary1,
            timestamp_ms=1234000,
        )
        metric2 = metrics_pb2.Metric(
            summary=summary2,
            timestamp_ms=1234000,
        )
        family = metrics_pb2.MetricFamily(
            name=str(metricsd_pb2.process_max_fds),
            type=metrics_pb2.SUMMARY,
        )
        metric1.label.add(
            name=str(metricsd_pb2.result),
            value='success',
        )
        metric2.label.add(
            name=str(metricsd_pb2.result),
            value='failure',
        )
        family.metric.extend([metric1, metric2])

        with unittest.mock.patch('time.time') as mock_time:
            mock_time.side_effect = lambda: 1234
            self.assertCountEqual(
                list(metrics_export.get_metrics(self.registry))[0].metric,
                family.metric,
            )

    def test_histogram(self):
        """Test that we can track histogram in Service303"""
        # Add a histogram with a label to the regisry
        c = Histogram(
            'process_max_fds', 'A summary', ['result'],
            registry=self.registry, buckets=[0, 2, float('inf')],
        )
        c.labels('success').observe(1.23)
        c.labels('failure').observe(2.34)

        # Build proto outputs
        histogram1 = metrics_pb2.Histogram(sample_count=1, sample_sum=1.23)
        histogram1.bucket.add(upper_bound=0, cumulative_count=0)
        histogram1.bucket.add(upper_bound=2, cumulative_count=1)
        histogram1.bucket.add(upper_bound=float('inf'), cumulative_count=1)
        histogram2 = metrics_pb2.Histogram(sample_count=1, sample_sum=2.34)
        histogram2.bucket.add(upper_bound=0, cumulative_count=0)
        histogram2.bucket.add(upper_bound=2, cumulative_count=0)
        histogram2.bucket.add(upper_bound=float('inf'), cumulative_count=1)
        metric1 = metrics_pb2.Metric(
            histogram=histogram1,
            timestamp_ms=1234000,
        )
        metric2 = metrics_pb2.Metric(
            histogram=histogram2,
            timestamp_ms=1234000,
        )
        family = metrics_pb2.MetricFamily(
            name=str(metricsd_pb2.process_max_fds),
            type=metrics_pb2.HISTOGRAM,
        )
        metric1.label.add(
            name=str(metricsd_pb2.result),
            value='success',
        )
        metric2.label.add(
            name=str(metricsd_pb2.result),
            value='failure',
        )
        family.metric.extend([metric1, metric2])

        with unittest.mock.patch('time.time') as mock_time:
            mock_time.side_effect = lambda: 1234
            self.assertCountEqual(
                list(metrics_export.get_metrics(self.registry))[0].metric,
                family.metric,
            )

    def test_converted_enums(self):
        """ Test that metric names and labels are auto converted """
        # enum values (from metricsd.proto):
        # mme_new_association => 500, result => 0
        c = Counter(
            'mme_new_association', 'A counter', ['result'],
            registry=self.registry,
        )

        c.labels('success').inc(1.23)

        metric_family = list(metrics_export.get_metrics(self.registry))[0]

        self.assertEqual(
            metric_family.name,
            str(metricsd_pb2.mme_new_association),
        )
        metric_labels = metric_family.metric[0].label
        # Order not guaranteed=
        self.assertEqual(metric_labels[0].name, str(metricsd_pb2.result))
        self.assertEqual(metric_labels[0].value, 'success')


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