# Copyright 2022 The Kubeflow Authors. All Rights Reserved.
#
# 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.
"""Module for importing a model evaluation to an existing Vertex model resource."""
import argparse
import base64
import json
import logging
import os
import sys
from typing import Any, Dict, Iterable, List, Optional, Tuple

from google.api_core import gapic_v1
from google.cloud import aiplatform
from google.cloud.aiplatform_v1.types.model_evaluation_slice import ModelEvaluationSlice
from google_cloud_pipeline_components.proto.gcp_resources_pb2 import GcpResources
import six

from google.protobuf.struct_pb2 import ListValue, NULL_VALUE, Struct, Value
from google.protobuf import json_format

PROBLEM_TYPE_TO_SCHEMA_URI = {
    'classification': 'gs://google-cloud-aiplatform/schema/modelevaluation/classification_metrics_1.0.0.yaml',
    'regression': 'gs://google-cloud-aiplatform/schema/modelevaluation/regression_metrics_1.0.0.yaml',
    'forecasting': 'gs://google-cloud-aiplatform/schema/modelevaluation/forecasting_metrics_1.0.0.yaml',
    'text-generation': 'gs://google-cloud-aiplatform/schema/modelevaluation/general_text_generation_metrics_1.0.0.yaml',
    'question-answering': 'gs://google-cloud-aiplatform/schema/modelevaluation/question_answering_metrics_1.0.0.yaml',
    'summarization': 'gs://google-cloud-aiplatform/schema/modelevaluation/summarization_metrics_1.0.0.yaml',
}

MODEL_EVALUATION_RESOURCE_TYPE = 'ModelEvaluation'
MODEL_EVALUATION_SLICE_RESOURCE_TYPE = 'ModelEvaluationSlice'
SLICE_BATCH_IMPORT_LIMIT = 50
ULM_TASKS = set(['text-generation', 'question-answering', 'summarization'])


def _make_parent_dirs_and_return_path(file_path: str):
  os.makedirs(os.path.dirname(file_path), exist_ok=True)
  return file_path


parser = argparse.ArgumentParser(
    prog='Vertex Model Service evaluation importer', description=''
)
parser.add_argument('--metrics', dest='metrics', type=str, default='')
parser.add_argument(
    '--classification_metrics',
    dest='classification_metrics',
    type=str,
    default='',
)
parser.add_argument(
    '--forecasting_metrics', dest='forecasting_metrics', type=str, default=''
)
parser.add_argument(
    '--regression_metrics', dest='regression_metrics', type=str, default=''
)
parser.add_argument(
    '--text_generation_metrics',
    dest='text_generation_metrics',
    type=str,
    default='',
)
parser.add_argument(
    '--question_answering_metrics',
    dest='question_answering_metrics',
    type=str,
    default='',
)
parser.add_argument(
    '--summarization_metrics',
    dest='summarization_metrics',
    type=str,
    default='',
)
parser.add_argument(
    '--feature_attributions',
    dest='feature_attributions',
    type=str,
    default='',
)
parser.add_argument(
    '--metrics_explanation', dest='metrics_explanation', type=str, default=''
)
parser.add_argument('--explanation', dest='explanation', type=str, default='')
parser.add_argument('--problem_type', dest='problem_type', type=str, default='')
parser.add_argument(
    '--display_name', nargs='?', dest='display_name', type=str, default=''
)
parser.add_argument(
    '--pipeline_job_id', dest='pipeline_job_id', type=str, default=''
)
parser.add_argument(
    '--pipeline_job_resource_name',
    dest='pipeline_job_resource_name',
    type=str,
    default=None,
)
parser.add_argument(
    '--dataset_path', nargs='?', dest='dataset_path', type=str, default=''
)
parser.add_argument(
    '--dataset_paths', nargs='?', dest='dataset_paths', type=str, default='[]'
)
parser.add_argument(
    '--dataset_type', nargs='?', dest='dataset_type', type=str, default=''
)
parser.add_argument(
    '--model_name',
    dest='model_name',
    type=str,
    required=True,
    default=argparse.SUPPRESS,
)
parser.add_argument(
    '--gcp_resources',
    dest='gcp_resources',
    type=_make_parent_dirs_and_return_path,
    required=True,
    default=argparse.SUPPRESS,
)


def main(argv):
  """Calls ModelService.ImportModelEvaluation."""
  parsed_args, _ = parser.parse_known_args(argv)

  if parsed_args.model_name.startswith('publishers'):
    return

  _, project_id, _, location, _, model_id = parsed_args.model_name.split('/')
  api_endpoint = location + '-aiplatform.googleapis.com'
  resource_uri_prefix = f'https://{api_endpoint}/v1/'

  if parsed_args.classification_metrics:
    metrics_file_path = parsed_args.classification_metrics
    problem_type = 'classification'
  elif parsed_args.forecasting_metrics:
    metrics_file_path = parsed_args.forecasting_metrics
    problem_type = 'forecasting'
  elif parsed_args.regression_metrics:
    metrics_file_path = parsed_args.regression_metrics
    problem_type = 'regression'
  elif parsed_args.text_generation_metrics:
    metrics_file_path = parsed_args.text_generation_metrics
    problem_type = 'text-generation'
  elif parsed_args.question_answering_metrics:
    metrics_file_path = parsed_args.question_answering_metrics
    problem_type = 'question-answering'
  elif parsed_args.summarization_metrics:
    metrics_file_path = parsed_args.summarization_metrics
    problem_type = 'summarization'
  else:
    metrics_file_path = parsed_args.metrics
    problem_type = parsed_args.problem_type

  logging.info('metrics_file_path: %s', metrics_file_path)
  logging.info('problem_type: %s', problem_type)
  metrics_file_path = (
      metrics_file_path
      if not metrics_file_path.startswith('gs://')
      else '/gcs' + metrics_file_path[4:]
  )

  schema_uri = PROBLEM_TYPE_TO_SCHEMA_URI.get(problem_type)
  overall_slice, sliced_metrics = read_metrics_from_file(
      metrics_file_path, problem_type
  )

  model_evaluation = {
      'metrics': overall_slice['metrics'],
      'metrics_schema_uri': schema_uri,
  }

  if (
      parsed_args.explanation
      and parsed_args.explanation
      == "{{$.inputs.artifacts['explanation'].metadata['explanation_gcs_path']}}"
  ):
    # metrics_explanation must contain explanation_gcs_path when provided.
    logging.error('"explanation" must contain explanations when provided.')
    sys.exit(13)
  elif parsed_args.feature_attributions:
    explanation_file_name = (
        parsed_args.feature_attributions
        if not parsed_args.feature_attributions.startswith('gs://')
        else '/gcs' + parsed_args.feature_attributions[4:]
    )
  elif parsed_args.explanation:
    explanation_file_name = (
        parsed_args.explanation
        if not parsed_args.explanation.startswith('gs://')
        else '/gcs' + parsed_args.explanation[4:]
    )
  elif (
      parsed_args.metrics_explanation
      and parsed_args.metrics_explanation
      != "{{$.inputs.artifacts['metrics'].metadata['explanation_gcs_path']}}"
  ):
    explanation_file_name = (
        parsed_args.metrics_explanation
        if not parsed_args.metrics_explanation.startswith('gs://')
        else '/gcs' + parsed_args.metrics_explanation[4:]
    )
  else:
    explanation_file_name = None
  if explanation_file_name:
    with open(explanation_file_name) as explanation_file:
      model_evaluation['model_explanation'] = {
          'mean_attributions': [
              {
                  'feature_attributions': to_value(
                      json.loads(explanation_file.read())['explanation'][
                          'attributions'
                      ][0]['featureAttributions']
                  )
              }
          ]
      }

  if parsed_args.display_name:
    model_evaluation['display_name'] = parsed_args.display_name

  try:
    dataset_paths = json.loads(parsed_args.dataset_paths)
    if not isinstance(dataset_paths, list) or not all(
        isinstance(el, str) for el in dataset_paths
    ):
      dataset_paths = []
  except ValueError:
    dataset_paths = []

  if parsed_args.dataset_path:
    dataset_paths.append(parsed_args.dataset_path)

  metadata = {
      key: value
      for key, value in {
          'pipeline_job_id': parsed_args.pipeline_job_id,
          'pipeline_job_resource_name': parsed_args.pipeline_job_resource_name,
          'evaluation_dataset_type': parsed_args.dataset_type,
          'evaluation_dataset_path': dataset_paths or None,
      }.items()
      if value
  }
  if metadata:
    model_evaluation['metadata'] = to_value(metadata)

  client = aiplatform.gapic.ModelServiceClient(
      client_info=gapic_v1.client_info.ClientInfo(
          user_agent='google-cloud-pipeline-components'
      ),
      client_options={
          'api_endpoint': api_endpoint,
      },
  )
  import_model_evaluation_response = client.import_model_evaluation(
      parent=parsed_args.model_name,
      model_evaluation=model_evaluation,
  )
  model_evaluation_name = import_model_evaluation_response.name

  resources = GcpResources()
  # Write the model evaluation resource to GcpResources output.
  model_eval_resource = resources.resources.add()
  model_eval_resource.resource_type = MODEL_EVALUATION_RESOURCE_TYPE
  model_eval_resource.resource_uri = (
      f'{resource_uri_prefix}{model_evaluation_name}'
  )

  # Import model evaluation slices if present.
  if sliced_metrics:
    slice_resource_names = []
    sliced_feature_attributions = {}
    if explanation_file_name:
      sliced_feature_attributions = sliced_explanation_to_dict(
          explanation_file_name, sliced_feature_attributions
      )
    # BatchImportModelEvaluationSlices has a size limit of 50 slices.
    slices = []
    slices_with_slice_spec = []
    slices_with_explanations = []
    for one_slice in sliced_metrics:
      slice_spec = to_slice(one_slice['singleOutputSlicingSpec'])
      slice_config = {
          'metrics': one_slice['metrics'],
          'metrics_schema_uri': schema_uri,
          'slice_': slice_spec,
      }
      if (
          sliced_feature_attributions
          and slice_spec['dimension'] == 'annotationSpec'
      ):
        slice_config['model_explanation'] = {
            'mean_attributions': [
                {
                    'feature_attributions': sliced_feature_attributions[
                        slice_spec['value']
                    ]
                }
            ]
        }
        slices_with_explanations.append(slice_config)
      elif 'slice_spec' in slice_spec:
        slices_with_slice_spec.append(slice_config)
      else:
        slices.append(slice_config)

    def batch_import_slices_list(slices_list) -> Iterable[str]:
      for i in range(0, len(slices_list), SLICE_BATCH_IMPORT_LIMIT):
        yield client.batch_import_model_evaluation_slices(
            parent=model_evaluation_name,
            model_evaluation_slices=slices_list[
                i : i + SLICE_BATCH_IMPORT_LIMIT
            ],
        ).imported_model_evaluation_slices

    slice_resource_names.extend(batch_import_slices_list(slices))
    slice_resource_names.extend(
        batch_import_slices_list(slices_with_slice_spec)
    )
    slice_resource_names.extend(
        batch_import_slices_list(slices_with_explanations)
    )

    for slice_resource in slice_resource_names:
      slice_mlmd_resource = resources.resources.add()
      slice_mlmd_resource.resource_type = MODEL_EVALUATION_SLICE_RESOURCE_TYPE
      slice_mlmd_resource.resource_uri = (
          f'{resource_uri_prefix}{slice_resource}'
      )

  with open(parsed_args.gcp_resources, 'w') as f:
    f.write(json_format.MessageToJson(resources))


def read_metrics_from_file(
    metrics_file_path: str, problem_type: str
) -> Tuple[Dict[str, Any], Optional[List[Dict[str, Any]]]]:
  """Reads the metrics and sliced metrics from gcs file.

  Args:
      metrics_file_path: The gcs file with holds the metrics.
      problem_type: The problem type of the metrics.

  Returns:
      tuple(dict[str, Any], dict[str, Any]): a tuple of evaluation metrics and
      the corresponding sliced metrics.
  """
  with open(metrics_file_path) as metrics_file:
    all_metrics = json.loads(metrics_file.read())
    if problem_type in ULM_TASKS:
      return {'metrics': to_value(all_metrics)}, None
    all_metrics = all_metrics['slicedMetrics']
    all_sliced_metrics = []
    for slice_idx in range(len(all_metrics)):
      one_slice = all_metrics[slice_idx]
      if problem_type == 'classification':
        if (
            'metrics' in one_slice
            and 'classification' in one_slice['metrics']
            and 'confusionMatrix' in one_slice['metrics']['classification']
            and 'annotationSpecs'
            in one_slice['metrics']['classification']['confusionMatrix']
            and 'confidenceMetrics' in one_slice['metrics']['classification']
            and len(
                one_slice['metrics']['classification']['confusionMatrix'][
                    'annotationSpecs'
                ]
            )
            > 100
        ):
          confidence_metrics = one_slice['metrics']['classification'][
              'confidenceMetrics'
          ]
          for idx in range(len(confidence_metrics)):
            if 'confusionMatrix' in confidence_metrics[idx]:
              del confidence_metrics[idx]['confusionMatrix']
          one_slice['metrics']['classification'][
              'confidenceMetrics'
          ] = confidence_metrics

      all_sliced_metrics.append({
          **one_slice,
          'metrics': to_value(next(iter(one_slice['metrics'].values()))),
      })
  overall_slice = all_sliced_metrics[0]
  sliced_metrics = all_sliced_metrics[1:]
  return overall_slice, sliced_metrics


def sliced_explanation_to_dict(
    explanation_file_name: str, sliced_feature_attributions: Dict[str, Any]
):
  with open(explanation_file_name) as explanation_file:
    explanations = json.loads(explanation_file.read())
    for sliced_explanation in explanations['explanation']['attributions'][1:]:
      sliced_feature_attributions[sliced_explanation['value']] = to_value(
          sliced_explanation['featureAttributions']
      )
  return sliced_feature_attributions


def to_slice(slicing_spec: Dict[str, Any]):
  """Converts a VertexEvaluation OutputSlicingSpec to a Vertex AI Slice.

  Args:
    slicing_spec: VertexEvaluation OutputSlicingSpec

  Returns:
    A dictionary with keys 'dimension' and 'value'. Optionally with key
      'sliceSpec'.
  """
  value = ''
  if 'dimension' in slicing_spec and slicing_spec['dimension'] == 'slice':
    value = slicing_spec['value'] if 'value' in slicing_spec else ''
    slice_spec = ModelEvaluationSlice.Slice.SliceSpec.from_json(
        json.dumps(slicing_spec.get('slicingSpec', {}))
    )
    slice_ = {
        'dimension': slicing_spec['dimension'],
        'value': value,
    }
    if slice_spec:
      slice_['slice_spec'] = slice_spec
    return slice_
  elif (
      'dimension' in slicing_spec
      and slicing_spec['dimension'] == 'annotationSpec'
      and 'value' in slicing_spec
  ):
    return {
        'dimension': slicing_spec['dimension'],
        'value': slicing_spec['value'],
    }

  if 'bytesValue' in slicing_spec:
    value = base64.b64decode(slicing_spec['bytesValue']).decode('utf-8')
  elif 'floatValue' in slicing_spec:
    value = str(slicing_spec['floatValue'])
  elif 'int64Value' in slicing_spec:
    value = str(slicing_spec['int64Value'])

  return {
      'dimension': 'annotationSpec',
      'value': value,
  }


def to_value(value):
  if value is None:
    return Value(null_value=NULL_VALUE)
  elif isinstance(value, bool):
    # This check needs to happen before isinstance(value, int),
    # isinstance(value, int) returns True when value is bool.
    return Value(bool_value=value)
  elif isinstance(value, six.integer_types) or isinstance(value, float):
    return Value(number_value=value)
  elif isinstance(value, six.string_types) or isinstance(value, six.text_type):
    return Value(string_value=value)
  elif isinstance(value, dict):
    return Value(
        struct_value=Struct(fields={k: to_value(v) for k, v in value.items()})
    )
  elif isinstance(value, list):
    return Value(
        list_value=ListValue(values=[to_value(item) for item in value])
    )
  else:
    raise ValueError('Unsupported data type: {}'.format(type(value)))


if __name__ == '__main__':
  print(sys.argv)
  main(sys.argv[1:])
