# coding=utf-8
# Copyright 2021 The HuggingFace Datasets Authors and the current dataset script contributor.
#
# 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
#
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# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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"""Spider-Syn: Spider Syn Dataset for evaluating Text-SQL models"""

import json
from turtle import down
from third_party.spider.preprocess.get_tables import dump_db_json_schema
import datasets
from typing import List, Generator, Any, Dict, Tuple

logger = datasets.logging.get_logger(__name__)

_CITATION = """
@article{gan2021towards,
  title={Towards robustness of text-to-SQL models against synonym substitution},
  author={Gan, Yujian and Chen, Xinyun and Huang, Qiuping and Purver, Matthew and Woodward, John R and Xie, Jinxia and Huang, Pengsheng},
  journal={arXiv preprint arXiv:2106.01065},
  year={2021}
}
"""

_DESCRIPTION = """\
    Spider-Syn: synthesized data for original spider dataset.
"""

_HOMEPAGE = "https://zenodo.org/record/5205322#.Yh-B1uhByUl"

_LICENCE = "CC BY-SA 4.0"

_URL = "https://github.com/ygan/Spider-Syn/blob/main/Spider-Syn/dev.json"

class SpiderSyn(datasets.GeneratorBasedBuilder):
    VERSION = datasets.Version("1.0.0")

    BUILDER_CONFIGS = [datasets.BuilderConfig(
        name = "spider-syn",
        version = VERSION,
        description="Spider-Syn: Original spider dev data modified to test robustness of text-to-SQL models against synonym substitution."
    )]


    def __init__(self, *args, writer_batch_size=None, **kwargs) -> None:
        super().__init__(*args, writer_batch_size=writer_batch_size, **kwargs)
        self.schema_cache = dict()
        self.include_train_others: bool = kwargs.pop("include_train_others", False)

    def _info(self) -> datasets.DatasetInfo:
        features = datasets.Features(
            {
                "query": datasets.Value("string"),
                'question': datasets.Value('string'),
                "db_id": datasets.Value("string"),
                "db_path": datasets.Value("string"),
                "db_table_names": datasets.features.Sequence(datasets.Value("string")),
                "db_column_names": datasets.features.Sequence(
                    {
                        "table_id":datasets.Value("int32"),
                        "column_name": datasets.Value("string")
                    }
                ),
                "db_column_types":datasets.features.Sequence(datasets.Value("string")),
                "db_primary_keys": datasets.features.Sequence({
                    "column_id":datasets.Value("int32"),
                }),
                "db_foreign_keys":datasets.features.Sequence(
                    {
                        "column_id":datasets.Value("int32"),
                        "other_column_id":datasets.Value("int32")
                    }
                ),
            }
        )

        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=features,
            supervised_keys=None,
            homepage=_HOMEPAGE,
            citation=_CITATION
        )

    def _split_generators(self, dl_manager) -> List[datasets.SplitGenerator]:
        downloaded_filepath = dl_manager.download_and_extract(_URL)

        return [
            datasets.SplitGenerator(
                name = datasets.Split.VALIDATION,
                gen_kwargs={
                    "data_filepaths":[downloaded_filepath + "/spider-syn/spider-syn.json"],
                    "db_path": downloaded_filepath + "/spider-syn/database",
                },
            ),
        ]
    
    def _generate_examples(
        self, data_filepaths: List[str], db_path: str
    ) -> Generator[Tuple[int, Dict[str, Any]], None, None]:
    
        for data_filepath in data_filepaths:
            if(data_filepath.find('train_spider.json')>=0):
                question_field = "question"
            else:
                question_field = "SpiderSynQuestion"
            logger.info("generating examples form = %s", data_filepath)
            with open(data_filepath, encoding='utf-8') as f:
                spider_syn = json.load(f)
                for idx, sample in enumerate(spider_syn):
                    db_id = sample['db_id']
                    if db_id not in self.schema_cache:
                        self.schema_cache[db_id] = dump_db_json_schema(
                            db_path + "/" + db_id + "/" + db_id + ".sqlite", db_id
                        )
                    schema = self.schema_cache[db_id]
                    yield idx, {
                        "query": sample['query'],
                        "question": sample[question_field],
                        "db_id": db_id,
                        "db_path": db_path,
                        "db_table_names": schema["table_names_original"],
                        "db_column_names": [
                            {"table_id": table_id, "column_name": column_name}
                            for table_id, column_name in schema["column_names_original"]
                        ],
                        "db_column_types": schema["column_types"],
                        "db_primary_keys": [{"column_id": column_id} for column_id in schema["primary_keys"]],
                        "db_foreign_keys": [
                            {"column_id": column_id, "other_column_id": other_column_id}
                            for column_id, other_column_id in schema["foreign_keys"]
                        ],
                    }