import os
import pandas as pd
import numpy as np
from scraper.top100_extractor import programming_crime_list
COMPANIES_CSV_PATH: str = 'scraper/companies.csv'

def non_nan(a: list[any]) -> list[any]:
    return list(filter(lambda a: type(a) == str or not np.isnan(a), a))


def get_companies(root_dir: str) -> list[dict]:
    """ 
    reads the companies.csv file and returns it as a JSON-ifiable object 
    to return to the frontend.
    """
    df = pd.read_csv(os.path.join(root_dir, COMPANIES_CSV_PATH), index_col='ticker')
    tickers = pd.Series(programming_crime_list)
    df = df.loc[df.index.isin(tickers), :]
    df['tags'] = df[['tag 1', 'tag 2', 'tag 3']].values.tolist()
    df['tags'] = df['tags'].apply(non_nan)
    del df['tag 1']
    del df['tag 2']
    del df['tag 3']
    return df.reset_index().replace({ np.nan: None }).to_dict('records')