# Copyright 2023 The CLU Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Tests for interface."""
# pylint: disable=g-importing-member

import itertools
from typing import Any
from unittest import mock

from absl.testing import absltest
from absl.testing import parameterized
from clu import values
from clu.metric_writers import utils
from clu.metric_writers.async_writer import AsyncMultiWriter
from clu.metric_writers.async_writer import AsyncWriter
from clu.metric_writers.interface import MetricWriter
from clu.metric_writers.logging_writer import LoggingWriter
from clu.metric_writers.multi_writer import MultiWriter
from clu.metric_writers.summary_writer import SummaryWriter
import clu.metrics
import flax.struct
import jax.numpy as jnp
import tensorflow as tf


@flax.struct.dataclass
class HistogramMetric(clu.metrics.Metric):
  value: jnp.ndarray
  num_buckets: int

  def compute_value(self):
    return values.Histogram(self.value, self.num_buckets)


@flax.struct.dataclass
class ImageMetric(clu.metrics.Metric):
  value: jnp.ndarray

  def compute_value(self):
    return values.Image(self.value)


@flax.struct.dataclass
class AudioMetric(clu.metrics.Metric):
  value: jnp.ndarray
  sample_rate: int

  def compute_value(self):
    return values.Audio(self.value, self.sample_rate)


@flax.struct.dataclass
class TextMetric(clu.metrics.Metric):
  value: str

  def compute_value(self):
    return values.Text(self.value)


@flax.struct.dataclass
class HyperParamMetric(clu.metrics.Metric):
  value: float

  def compute_value(self):
    return values.HyperParam(self.value)


@flax.struct.dataclass
class SummaryMetric(clu.metrics.Metric):
  value: jnp.ndarray
  metadata: Any

  def compute_value(self):
    return values.Summary(self.value, self.metadata)


def _to_summary(metrics):
  return {k: v.value for k, v in metrics.items()}


def _to_list_of_dicts(d):
  return [{k: v} for k, v in d.items()]


class ONEOF(object):
  """ONEOF(options_list) check value in options_list."""

  def __init__(self, container):
    if not hasattr(container, "__contains__"):
      raise TypeError(f"{container!r} is not a container")
    if not container:
      raise ValueError(f"{container!r} is empty")
    self._c = container

  def __eq__(self, o):
    return o in self._c

  def __ne__(self, o):
    return o not in self._c

  def __repr__(self):
    return "<ONEOF({})>".format(",".join(repr(i) for i in self._c))


class MetricWriterTest(tf.test.TestCase, parameterized.TestCase):

  def test_write(self):
    writer = mock.Mock(spec_set=MetricWriter)
    step = 3
    num_buckets = 4
    sample_rate = 10
    scalar_metrics = {
        "loss": clu.metrics.Average.from_model_output(jnp.asarray([1, 2, 3])),
        "accuracy": clu.metrics.LastValue.from_model_output(jnp.asarray([5])),
    }
    image_metrics = {
        "image": ImageMetric(jnp.asarray([[4, 5], [1, 2]])),
    }
    histogram_metrics = {
        "hist": HistogramMetric(
            value=jnp.asarray([7, 8]), num_buckets=num_buckets
        ),
        "hist2": HistogramMetric(
            value=jnp.asarray([9, 10]), num_buckets=num_buckets
        ),
    }
    audio_metrics = {
        "audio": AudioMetric(
            value=jnp.asarray([1, 5]), sample_rate=sample_rate
        ),
        "audio2": AudioMetric(
            value=jnp.asarray([1, 5]), sample_rate=sample_rate + 2
        ),
    }
    text_metrics = {
        "text": TextMetric(value="hello"),
    }
    hparam_metrics = {
        "lr": HyperParamMetric(value=0.01),
    }
    summary_metrics = {
        "summary": SummaryMetric(
            value=jnp.asarray([2, 3, 10]), metadata="some info"
        ),
        "summary2": SummaryMetric(value=jnp.asarray([2, 3, 10]), metadata=5),
    }
    metrics = {
        **scalar_metrics,
        **image_metrics,
        **histogram_metrics,
        **audio_metrics,
        **text_metrics,
        **hparam_metrics,
        **summary_metrics,
    }
    metrics = {k: m.compute_value() for k, m in metrics.items()}
    utils.write_values(writer, step, metrics)

    writer.write_scalars.assert_called_once_with(
        step, {k: m.compute() for k, m in scalar_metrics.items()}
    )
    writer.write_images.assert_called_once_with(
        step, _to_summary(image_metrics)
    )
    writer.write_histograms.assert_called_once_with(
        step,
        _to_summary(histogram_metrics),
        num_buckets={k: v.num_buckets for k, v in histogram_metrics.items()},
    )
    writer.write_audios.assert_called_with(
        step,
        ONEOF(_to_list_of_dicts(_to_summary(audio_metrics))),
        sample_rate=ONEOF([sample_rate, sample_rate + 2]),
    )
    writer.write_texts.assert_called_once_with(step, _to_summary(text_metrics))
    writer.write_hparams.assert_called_once_with(
        step, _to_summary(hparam_metrics)
    )
    writer.write_summaries.assert_called_with(
        step,
        ONEOF(_to_list_of_dicts(_to_summary(summary_metrics))),
        metadata=ONEOF(["some info", 5]),
    )


  def test_create_default_writer_summary_writer_is_added(self):
    writer = utils.create_default_writer(
        logdir=self.get_temp_dir(), asynchronous=False
    )
    self.assertTrue(any(isinstance(w, SummaryWriter) for w in writer._writers))
    writer = utils.create_default_writer(logdir=None, asynchronous=False)
    self.assertFalse(any(isinstance(w, SummaryWriter) for w in writer._writers))


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