file_handler.py

import json

class File_Handler:
    def __init__(self,file_name):
        self.file_name = file_name

    def create_new_file(self):
        with open(self.file_name, 'w') as f:
            json.dump({'index': 0,'sender': 'server', 'message': ""},f)
            f.write('\n')

    def empty_file(self):
        with open(self.file_name, 'w') as f:
            pass

    def append_json_data(self, json_data):
        with open(self.file_name, 'a') as f:
            json.dump(json_data, f)
            f.write('\n')

    def read_json_array(self):
        with open(self.file_name, 'r') as f:
            json_lines = f.readlines()


        json_array = []
        for line in json_lines:
            json_data = json.loads(line)
            json_array.append(json_data)

        return json_array

    def get_last_json(self):
        data = self.read_json_array()
        last = len(data)
        return data[last-1]
    
    def del_json_with_index(self,ind):
        data = self.read_json_array()
        newData =[]

        row = 0
        for d in data:
            if(int(d['index']) == ind):
                pass
            else:
                newData.append({"index": row, "sender": d['sender'], "message": d['message']})
                row += 1
        
        self.empty_file()
        for d in newData:
            self.append_json_data(d)

    def get_len_of_json_array(self):
        data = self.read_json_array()
        return len(data)