# Copyright The OpenTelemetry Authors
# SPDX-License-Identifier: Apache-2.0

from unittest import TestCase

from opentelemetry.sdk.metrics import MeterProvider
from opentelemetry.sdk.metrics._internal.exemplar import (
    AlwaysOffExemplarFilter,
    AlwaysOnExemplarFilter,
)
from opentelemetry.sdk.metrics.export import InMemoryMetricReader
from opentelemetry.sdk.resources import SERVICE_NAME, Resource


class TestHistogramExport(TestCase):
    def test_histogram_counter_collection(self):
        in_memory_metric_reader = InMemoryMetricReader()

        provider = MeterProvider(
            resource=Resource.create({SERVICE_NAME: "otel-test"}),
            metric_readers=[in_memory_metric_reader],
        )

        meter = provider.get_meter("my-meter")

        histogram = meter.create_histogram("my_histogram")
        counter = meter.create_counter("my_counter")
        histogram.record(5, {"attribute": "value"})
        counter.add(1, {"attribute": "value_counter"})

        metric_data = in_memory_metric_reader.get_metrics_data()

        self.assertEqual(len(metric_data.resource_metrics[0].scope_metrics[0].metrics), 2)

        self.assertEqual(
            (metric_data.resource_metrics[0].scope_metrics[0].metrics[0].data.data_points[0].bucket_counts),
            (0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
        )
        self.assertEqual(
            (metric_data.resource_metrics[0].scope_metrics[0].metrics[1].data.data_points[0].value),
            1,
        )

        metric_data = in_memory_metric_reader.get_metrics_data()

        self.assertEqual(len(metric_data.resource_metrics[0].scope_metrics[0].metrics), 2)
        self.assertEqual(
            (metric_data.resource_metrics[0].scope_metrics[0].metrics[0].data.data_points[0].bucket_counts),
            (0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
        )
        self.assertEqual(
            (metric_data.resource_metrics[0].scope_metrics[0].metrics[1].data.data_points[0].value),
            1,
        )

    def test_histogram_with_exemplars(self):
        in_memory_metric_reader = InMemoryMetricReader()

        provider = MeterProvider(
            resource=Resource.create({SERVICE_NAME: "otel-test"}),
            metric_readers=[in_memory_metric_reader],
            exemplar_filter=AlwaysOnExemplarFilter(),
        )
        meter = provider.get_meter("my-meter")
        histogram = meter.create_histogram("my_histogram")

        histogram.record(2, {"attribute": "value1"})  # Should go in the first bucket
        histogram.record(7, {"attribute": "value2"})  # Should go in the second bucket
        histogram.record(9, {"attribute": "value2"})  # Should also go in the second bucket
        histogram.record(15, {"attribute": "value3"})  # Should go in the third bucket

        metric_data = in_memory_metric_reader.get_metrics_data()

        self.assertEqual(len(metric_data.resource_metrics[0].scope_metrics[0].metrics), 1)
        histogram_metric = metric_data.resource_metrics[0].scope_metrics[0].metrics[0]

        self.assertEqual(len(histogram_metric.data.data_points), 3)

        self.assertEqual(len(histogram_metric.data.data_points[0].exemplars), 1)
        self.assertEqual(len(histogram_metric.data.data_points[1].exemplars), 1)
        self.assertEqual(len(histogram_metric.data.data_points[2].exemplars), 1)

        self.assertEqual(histogram_metric.data.data_points[0].sum, 2)
        self.assertEqual(histogram_metric.data.data_points[1].sum, 16)
        self.assertEqual(histogram_metric.data.data_points[2].sum, 15)

        self.assertEqual(histogram_metric.data.data_points[0].exemplars[0].value, 2.0)
        self.assertEqual(histogram_metric.data.data_points[1].exemplars[0].value, 9.0)
        self.assertEqual(histogram_metric.data.data_points[2].exemplars[0].value, 15.0)

    def test_filter_with_exemplars(self):
        in_memory_metric_reader = InMemoryMetricReader()

        provider = MeterProvider(
            resource=Resource.create({SERVICE_NAME: "otel-test"}),
            metric_readers=[in_memory_metric_reader],
            exemplar_filter=AlwaysOffExemplarFilter(),
        )
        meter = provider.get_meter("my-meter")
        histogram = meter.create_histogram("my_histogram")

        histogram.record(2, {"attribute": "value1"})  # Should go in the first bucket
        histogram.record(7, {"attribute": "value2"})  # Should go in the second bucket

        metric_data = in_memory_metric_reader.get_metrics_data()

        self.assertEqual(len(metric_data.resource_metrics[0].scope_metrics[0].metrics), 1)
        histogram_metric = metric_data.resource_metrics[0].scope_metrics[0].metrics[0]

        self.assertEqual(len(histogram_metric.data.data_points), 2)

        self.assertEqual(len(histogram_metric.data.data_points[0].exemplars), 0)
        self.assertEqual(len(histogram_metric.data.data_points[1].exemplars), 0)
