import string

import datasets
from datasets import DatasetInfo, load_dataset


def get_expre(example):
    seq = example["target_template"]
    new_seq = []
    for comp in seq[2:]:
        if comp.startswith("temp"):
            new_seq.append("{" + comp + "}")
        elif comp == "PI":
            new_seq.append("3.14")
        elif comp == "^":
            new_seq.append("**")
        else:
            new_seq.append(comp)
    # num_list = list(set(sorted(num_list)))
    # alphabet = string.ascii_lowercase
    # num_list = list(map(lambda x: "temp_" + x, alphabet[: len(example["num_list"])]))
    eqs = "".join(new_seq)
    return {"expression": eqs}


# 获取字母表
def regular(example):
    if example["id"] in ["17520"]:
        return False
    alphabet = string.ascii_lowercase
    num_list = list(map(lambda x: "temp_" + x, alphabet[: len(example["num_list"])]))
    eqs = example["expression"].format(**dict(zip(num_list, example["num_list"])))
    return eval(eqs) == example["answer"]


class DatasetBuilder(datasets.DatasetBuilder):
    def _info(self):
        return DatasetInfo()

    def __init__(self, **kwargs):
        super().__init__(**kwargs)

    def download_and_prepare(self, *args, **kwargs):
        return self

    def as_dataset(self, split, **kwargs):
        ds = load_dataset("Gxg/Math23K", self.config.name, split=split)
        ds = ds.map(get_expre).filter(regular)
        return ds