# coding=utf-8
# Copyright 2018 The Google AI Language Team Authors and The HuggingFace Inc. team.
# Copyright (c) 2018, NVIDIA CORPORATION.  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.
""" GLUE processors and helpers """

import os
import warnings
from dataclasses import asdict
from enum import Enum
from typing import List, Optional, Union

from ...file_utils import is_tf_available
from ...tokenization_utils import PreTrainedTokenizer
from ...utils import logging
from .utils import DataProcessor, InputExample, InputFeatures


if is_tf_available():
    import tensorflow as tf

logger = logging.get_logger(__name__)

DEPRECATION_WARNING = (
    "This {0} will be removed from the library soon, preprocessing should be handled with the 🤗 Datasets "
    "library. You can have a look at this example script for pointers: "
    "https://github.com/huggingface/transformers/blob/master/examples/pytorch/text-classification/run_glue.py"
)


def glue_convert_examples_to_features(
    examples: Union[List[InputExample], "tf.data.Dataset"],
    tokenizer: PreTrainedTokenizer,
    max_length: Optional[int] = None,
    task=None,
    label_list=None,
    output_mode=None,
):
    """
    Loads a data file into a list of ``InputFeatures``

    Args:
        examples: List of ``InputExamples`` or ``tf.data.Dataset`` containing the examples.
        tokenizer: Instance of a tokenizer that will tokenize the examples
        max_length: Maximum example length. Defaults to the tokenizer's max_len
        task: GLUE task
        label_list: List of labels. Can be obtained from the processor using the ``processor.get_labels()`` method
        output_mode: String indicating the output mode. Either ``regression`` or ``classification``

    Returns:
        If the ``examples`` input is a ``tf.data.Dataset``, will return a ``tf.data.Dataset`` containing the
        task-specific features. If the input is a list of ``InputExamples``, will return a list of task-specific
        ``InputFeatures`` which can be fed to the model.

    """
    warnings.warn(DEPRECATION_WARNING.format("function"), FutureWarning)
    if is_tf_available() and isinstance(examples, tf.data.Dataset):
        if task is None:
            raise ValueError("When calling glue_convert_examples_to_features from TF, the task parameter is required.")
        return _tf_glue_convert_examples_to_features(examples, tokenizer, max_length=max_length, task=task)
    return _glue_convert_examples_to_features(
        examples, tokenizer, max_length=max_length, task=task, label_list=label_list, output_mode=output_mode
    )


if is_tf_available():

    def _tf_glue_convert_examples_to_features(
        examples: tf.data.Dataset,
        tokenizer: PreTrainedTokenizer,
        task=str,
        max_length: Optional[int] = None,
    ) -> tf.data.Dataset:
        """
        Returns:
            A ``tf.data.Dataset`` containing the task-specific features.

        """
        processor = glue_processors[task]()
        examples = [processor.tfds_map(processor.get_example_from_tensor_dict(example)) for example in examples]
        features = glue_convert_examples_to_features(examples, tokenizer, max_length=max_length, task=task)
        label_type = tf.float32 if task == "sts-b" else tf.int64

        def gen():
            for ex in features:
                d = {k: v for k, v in asdict(ex).items() if v is not None}
                label = d.pop("label")
                yield (d, label)

        input_names = tokenizer.model_input_names

        return tf.data.Dataset.from_generator(
            gen,
            ({k: tf.int32 for k in input_names}, label_type),
            ({k: tf.TensorShape([None]) for k in input_names}, tf.TensorShape([])),
        )


def _glue_convert_examples_to_features(
    examples: List[InputExample],
    tokenizer: PreTrainedTokenizer,
    max_length: Optional[int] = None,
    task=None,
    label_list=None,
    output_mode=None,
):
    if max_length is None:
        max_length = tokenizer.model_max_length

    if task is not None:
        processor = glue_processors[task]()
        if label_list is None:
            label_list = processor.get_labels()
            logger.info(f"Using label list {label_list} for task {task}")
        if output_mode is None:
            output_mode = glue_output_modes[task]
            logger.info(f"Using output mode {output_mode} for task {task}")

    label_map = {label: i for i, label in enumerate(label_list)}

    def label_from_example(example: InputExample) -> Union[int, float, None]:
        if example.label is None:
            return None
        if output_mode == "classification":
            return label_map[example.label]
        elif output_mode == "regression":
            return float(example.label)
        raise KeyError(output_mode)

    labels = [label_from_example(example) for example in examples]

    batch_encoding = tokenizer(
        [(example.text_a, example.text_b) for example in examples],
        max_length=max_length,
        padding="max_length",
        truncation=True,
    )

    features = []
    for i in range(len(examples)):
        inputs = {k: batch_encoding[k][i] for k in batch_encoding}

        feature = InputFeatures(**inputs, label=labels[i])
        features.append(feature)

    for i, example in enumerate(examples[:5]):
        logger.info("*** Example ***")
        logger.info(f"guid: {example.guid}")
        logger.info(f"features: {features[i]}")

    return features


class OutputMode(Enum):
    classification = "classification"
    regression = "regression"


class MrpcProcessor(DataProcessor):
    """Processor for the MRPC data set (GLUE version)."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        warnings.warn(DEPRECATION_WARNING.format("processor"), FutureWarning)

    def get_example_from_tensor_dict(self, tensor_dict):
        """See base class."""
        return InputExample(
            tensor_dict["idx"].numpy(),
            tensor_dict["sentence1"].numpy().decode("utf-8"),
            tensor_dict["sentence2"].numpy().decode("utf-8"),
            str(tensor_dict["label"].numpy()),
        )

    def get_train_examples(self, data_dir):
        """See base class."""
        logger.info(f"LOOKING AT {os.path.join(data_dir, 'train.tsv')}")
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")

    def get_dev_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "dev.tsv")), "dev")

    def get_test_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "test.tsv")), "test")

    def get_labels(self):
        """See base class."""
        return ["0", "1"]

    def _create_examples(self, lines, set_type):
        """Creates examples for the training, dev and test sets."""
        examples = []
        for (i, line) in enumerate(lines):
            if i == 0:
                continue
            guid = f"{set_type}-{i}"
            text_a = line[3]
            text_b = line[4]
            label = None if set_type == "test" else line[0]
            examples.append(InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
        return examples


class MnliProcessor(DataProcessor):
    """Processor for the MultiNLI data set (GLUE version)."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        warnings.warn(DEPRECATION_WARNING.format("processor"), FutureWarning)

    def get_example_from_tensor_dict(self, tensor_dict):
        """See base class."""
        return InputExample(
            tensor_dict["idx"].numpy(),
            tensor_dict["premise"].numpy().decode("utf-8"),
            tensor_dict["hypothesis"].numpy().decode("utf-8"),
            str(tensor_dict["label"].numpy()),
        )

    def get_train_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")

    def get_dev_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "dev_matched.tsv")), "dev_matched")

    def get_test_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "test_matched.tsv")), "test_matched")

    def get_labels(self):
        """See base class."""
        return ["contradiction", "entailment", "neutral"]

    def _create_examples(self, lines, set_type):
        """Creates examples for the training, dev and test sets."""
        examples = []
        for (i, line) in enumerate(lines):
            if i == 0:
                continue
            guid = f"{set_type}-{line[0]}"
            text_a = line[8]
            text_b = line[9]
            label = None if set_type.startswith("test") else line[-1]
            examples.append(InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
        return examples


class MnliMismatchedProcessor(MnliProcessor):
    """Processor for the MultiNLI Mismatched data set (GLUE version)."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        warnings.warn(DEPRECATION_WARNING.format("processor"), FutureWarning)

    def get_dev_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "dev_mismatched.tsv")), "dev_mismatched")

    def get_test_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "test_mismatched.tsv")), "test_mismatched")


class ColaProcessor(DataProcessor):
    """Processor for the CoLA data set (GLUE version)."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        warnings.warn(DEPRECATION_WARNING.format("processor"), FutureWarning)

    def get_example_from_tensor_dict(self, tensor_dict):
        """See base class."""
        return InputExample(
            tensor_dict["idx"].numpy(),
            tensor_dict["sentence"].numpy().decode("utf-8"),
            None,
            str(tensor_dict["label"].numpy()),
        )

    def get_train_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")

    def get_dev_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "dev.tsv")), "dev")

    def get_test_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "test.tsv")), "test")

    def get_labels(self):
        """See base class."""
        return ["0", "1"]

    def _create_examples(self, lines, set_type):
        """Creates examples for the training, dev and test sets."""
        test_mode = set_type == "test"
        if test_mode:
            lines = lines[1:]
        text_index = 1 if test_mode else 3
        examples = []
        for (i, line) in enumerate(lines):
            guid = f"{set_type}-{i}"
            text_a = line[text_index]
            label = None if test_mode else line[1]
            examples.append(InputExample(guid=guid, text_a=text_a, text_b=None, label=label))
        return examples


class Sst2Processor(DataProcessor):
    """Processor for the SST-2 data set (GLUE version)."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        warnings.warn(DEPRECATION_WARNING.format("processor"), FutureWarning)

    def get_example_from_tensor_dict(self, tensor_dict):
        """See base class."""
        return InputExample(
            tensor_dict["idx"].numpy(),
            tensor_dict["sentence"].numpy().decode("utf-8"),
            None,
            str(tensor_dict["label"].numpy()),
        )

    def get_train_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")

    def get_dev_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "dev.tsv")), "dev")

    def get_test_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "test.tsv")), "test")

    def get_labels(self):
        """See base class."""
        return ["0", "1"]

    def _create_examples(self, lines, set_type):
        """Creates examples for the training, dev and test sets."""
        examples = []
        text_index = 1 if set_type == "test" else 0
        for (i, line) in enumerate(lines):
            if i == 0:
                continue
            guid = f"{set_type}-{i}"
            text_a = line[text_index]
            label = None if set_type == "test" else line[1]
            examples.append(InputExample(guid=guid, text_a=text_a, text_b=None, label=label))
        return examples


class StsbProcessor(DataProcessor):
    """Processor for the STS-B data set (GLUE version)."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        warnings.warn(DEPRECATION_WARNING.format("processor"), FutureWarning)

    def get_example_from_tensor_dict(self, tensor_dict):
        """See base class."""
        return InputExample(
            tensor_dict["idx"].numpy(),
            tensor_dict["sentence1"].numpy().decode("utf-8"),
            tensor_dict["sentence2"].numpy().decode("utf-8"),
            str(tensor_dict["label"].numpy()),
        )

    def get_train_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")

    def get_dev_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "dev.tsv")), "dev")

    def get_test_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "test.tsv")), "test")

    def get_labels(self):
        """See base class."""
        return [None]

    def _create_examples(self, lines, set_type):
        """Creates examples for the training, dev and test sets."""
        examples = []
        for (i, line) in enumerate(lines):
            if i == 0:
                continue
            guid = f"{set_type}-{line[0]}"
            text_a = line[7]
            text_b = line[8]
            label = None if set_type == "test" else line[-1]
            examples.append(InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
        return examples


class QqpProcessor(DataProcessor):
    """Processor for the QQP data set (GLUE version)."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        warnings.warn(DEPRECATION_WARNING.format("processor"), FutureWarning)

    def get_example_from_tensor_dict(self, tensor_dict):
        """See base class."""
        return InputExample(
            tensor_dict["idx"].numpy(),
            tensor_dict["question1"].numpy().decode("utf-8"),
            tensor_dict["question2"].numpy().decode("utf-8"),
            str(tensor_dict["label"].numpy()),
        )

    def get_train_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")

    def get_dev_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "dev.tsv")), "dev")

    def get_test_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "test.tsv")), "test")

    def get_labels(self):
        """See base class."""
        return ["0", "1"]

    def _create_examples(self, lines, set_type):
        """Creates examples for the training, dev and test sets."""
        test_mode = set_type == "test"
        q1_index = 1 if test_mode else 3
        q2_index = 2 if test_mode else 4
        examples = []
        for (i, line) in enumerate(lines):
            if i == 0:
                continue
            guid = f"{set_type}-{line[0]}"
            try:
                text_a = line[q1_index]
                text_b = line[q2_index]
                label = None if test_mode else line[5]
            except IndexError:
                continue
            examples.append(InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
        return examples


class QnliProcessor(DataProcessor):
    """Processor for the QNLI data set (GLUE version)."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        warnings.warn(DEPRECATION_WARNING.format("processor"), FutureWarning)

    def get_example_from_tensor_dict(self, tensor_dict):
        """See base class."""
        return InputExample(
            tensor_dict["idx"].numpy(),
            tensor_dict["question"].numpy().decode("utf-8"),
            tensor_dict["sentence"].numpy().decode("utf-8"),
            str(tensor_dict["label"].numpy()),
        )

    def get_train_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")

    def get_dev_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "dev.tsv")), "dev")

    def get_test_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "test.tsv")), "test")

    def get_labels(self):
        """See base class."""
        return ["entailment", "not_entailment"]

    def _create_examples(self, lines, set_type):
        """Creates examples for the training, dev and test sets."""
        examples = []
        for (i, line) in enumerate(lines):
            if i == 0:
                continue
            guid = f"{set_type}-{line[0]}"
            text_a = line[1]
            text_b = line[2]
            label = None if set_type == "test" else line[-1]
            examples.append(InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
        return examples


class RteProcessor(DataProcessor):
    """Processor for the RTE data set (GLUE version)."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        warnings.warn(DEPRECATION_WARNING.format("processor"), FutureWarning)

    def get_example_from_tensor_dict(self, tensor_dict):
        """See base class."""
        return InputExample(
            tensor_dict["idx"].numpy(),
            tensor_dict["sentence1"].numpy().decode("utf-8"),
            tensor_dict["sentence2"].numpy().decode("utf-8"),
            str(tensor_dict["label"].numpy()),
        )

    def get_train_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")

    def get_dev_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "dev.tsv")), "dev")

    def get_test_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "test.tsv")), "test")

    def get_labels(self):
        """See base class."""
        return ["entailment", "not_entailment"]

    def _create_examples(self, lines, set_type):
        """Creates examples for the training, dev and test sets."""
        examples = []
        for (i, line) in enumerate(lines):
            if i == 0:
                continue
            guid = f"{set_type}-{line[0]}"
            text_a = line[1]
            text_b = line[2]
            label = None if set_type == "test" else line[-1]
            examples.append(InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
        return examples


class WnliProcessor(DataProcessor):
    """Processor for the WNLI data set (GLUE version)."""

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        warnings.warn(DEPRECATION_WARNING.format("processor"), FutureWarning)

    def get_example_from_tensor_dict(self, tensor_dict):
        """See base class."""
        return InputExample(
            tensor_dict["idx"].numpy(),
            tensor_dict["sentence1"].numpy().decode("utf-8"),
            tensor_dict["sentence2"].numpy().decode("utf-8"),
            str(tensor_dict["label"].numpy()),
        )

    def get_train_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "train.tsv")), "train")

    def get_dev_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "dev.tsv")), "dev")

    def get_test_examples(self, data_dir):
        """See base class."""
        return self._create_examples(self._read_tsv(os.path.join(data_dir, "test.tsv")), "test")

    def get_labels(self):
        """See base class."""
        return ["0", "1"]

    def _create_examples(self, lines, set_type):
        """Creates examples for the training, dev and test sets."""
        examples = []
        for (i, line) in enumerate(lines):
            if i == 0:
                continue
            guid = f"{set_type}-{line[0]}"
            text_a = line[1]
            text_b = line[2]
            label = None if set_type == "test" else line[-1]
            examples.append(InputExample(guid=guid, text_a=text_a, text_b=text_b, label=label))
        return examples


glue_tasks_num_labels = {
    "cola": 2,
    "mnli": 3,
    "mrpc": 2,
    "sst-2": 2,
    "sts-b": 1,
    "qqp": 2,
    "qnli": 2,
    "rte": 2,
    "wnli": 2,
}

glue_processors = {
    "cola": ColaProcessor,
    "mnli": MnliProcessor,
    "mnli-mm": MnliMismatchedProcessor,
    "mrpc": MrpcProcessor,
    "sst-2": Sst2Processor,
    "sts-b": StsbProcessor,
    "qqp": QqpProcessor,
    "qnli": QnliProcessor,
    "rte": RteProcessor,
    "wnli": WnliProcessor,
}

glue_output_modes = {
    "cola": "classification",
    "mnli": "classification",
    "mnli-mm": "classification",
    "mrpc": "classification",
    "sst-2": "classification",
    "sts-b": "regression",
    "qqp": "classification",
    "qnli": "classification",
    "rte": "classification",
    "wnli": "classification",
}
