# coding=utf-8
# Copyright (c) 2020, 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.

"""MNLI dataset."""

from megatron import print_rank_0
from tasks.data_utils import clean_text
from .data import GLUEAbstractDataset
import json
from tasks.label_dict import get_label_dict 

LABELS = get_label_dict("WSC")

class WSCDataset(GLUEAbstractDataset):

    def __init__(self, name, datapaths, tokenizer, max_seq_length,
                 test_label="false"):
        self.test_label = test_label
        super().__init__('WSC', name, datapaths,
                         tokenizer, max_seq_length)

    def process_samples_from_single_path(self, filename):
        """"Implement abstract method."""
        print_rank_0(' > Processing {} ...'.format(filename))

        samples = []
        total = 0
        first = True
        is_test = False
        with open(filename, 'r') as f:
            reader = f.readlines()
            lines = []
            for line in reader:
                lines.append(json.loads(line.strip()))
            drop_cnt = 0
            for index, row in enumerate(lines):
                if "id" not in row:
                    row["id"] = index
                text_a = row['text']
                text_a_list = list(text_a)
                target = row['target']
                query = target['span1_text']
                query_idx = target['span1_index']
                pronoun = target['span2_text']
                pronoun_idx = target['span2_index']
                assert text_a[pronoun_idx: (pronoun_idx + len(pronoun))] == pronoun, "pronoun: {}".format(pronoun)
                assert text_a[query_idx: (query_idx + len(query))] == query, "query: {}".format(query)
                if pronoun_idx > query_idx:
                    text_a_list.insert(query_idx, "_")
                    text_a_list.insert(query_idx + len(query) + 1, "_")
                    text_a_list.insert(pronoun_idx + 2, "[")
                    text_a_list.insert(pronoun_idx + len(pronoun) + 2 + 1, "]")
                else:
                    text_a_list.insert(pronoun_idx, "[")
                    text_a_list.insert(pronoun_idx + len(pronoun) + 1, "]")
                    text_a_list.insert(query_idx + 2, "_")
                    text_a_list.insert(query_idx + len(query) + 2 + 1, "_")
                text_a = "".join(text_a_list)
                # text_b = "在这句话中，{}指代的是{}".format(pronoun, query)
                text_b = None
                if first:
                    first = False
                    if "label" not in row:
                        is_test = True
                        print_rank_0(
                            '   reading {}, {} and {} columns and setting '
                            'labels to {}'.format(
                                row["id"], text_a,
                                text_b, self.test_label))
                    else:
                        is_test = False
                        print_rank_0('    reading {} , {}, {}, and {} columns '
                                     '...'.format(
                                         row["id"], text_a,
                                         text_b, row["label"].strip()))

                text_a = text_a
                text_b = text_b
                # text_b = None
                unique_id = int(row["id"])

                if is_test:
                    label = self.test_label
                else:
                    label = row["label"].strip()
                
                assert len(text_a) > 0
                # assert len(text_b) > 0
                assert label in LABELS, "found label {} {} {}".format(label, row, type(label))
                assert unique_id >= 0

                sample = {'text_a': text_a,
                          'text_b': text_b,
                          'label': LABELS[label],
                          'uid': unique_id}
                total += 1
                samples.append(sample)

                if total % 5000 == 0:
                    print_rank_0('  > processed {} so far ...'.format(total))

        print_rank_0(' >> processed {} samples.'.format(len(samples)))
        print_rank_0(' >> drop {} samples.'.format(drop_cnt))

        return samples