import sys
import os
import shutil
import pandas as pd

class Split_Files:
    '''
        Class file for split file program
    '''
    def __init__(self, filename, split_number):
        '''
            Getting the file name and the split index
            Initializing the output directory, if present then truncate it.
            Getting the file extension
        '''
        self.file_name = filename
        self.directory = "file_split"
        self.split = int(split_number)
        if os.path.exists(self.directory):
            shutil.rmtree(self.directory)
        os.mkdir(self.directory)
        if self.file_name.endswith('.txt'):
            self.file_extension = '.txt'
        else:
            self.file_extension = '.csv'
        self.file_number = 1

    def split_data(self):
        '''
            spliting the input csv/txt file according to the index provided
        '''
        data = pd.read_csv(self.file_name, header=None)
        data.index += 1

        split_frame = pd.DataFrame()
        output_file = f"{self.directory}/split_file{self.file_number}{self.file_extension}"

        for i in range(1, len(data)+1):
            split_frame = split_frame.append(data.iloc[i-1])
            if i % self.split == 0:
                output_file = f"{self.directory}/split_file{self.file_number}{self.file_extension}"
                if self.file_extension == '.txt':
                    split_frame.to_csv(output_file, header=False, index=False, sep=' ')
                else:
                    split_frame.to_csv(output_file, header=False, index=False)
                split_frame.drop(split_frame.index, inplace=True)
                self.file_number += 1
        if not split_frame.empty:
            output_file = f"{self.directory}/split_file{self.file_number}{self.file_extension}"
            split_frame.to_csv(output_file, header=False, index=False)

if __name__ == '__main__':
    file, split_number = sys.argv[1], sys.argv[2]
    sp = Split_Files(file, split_number)
    sp.split_data()