import os
import json
import hashlib

def problema1(text):
    dicti = {}
    for a in text:
        if a in dicti:
            dicti[a] +=1
        else:
            dicti[a] = 0
    return max(dicti, key = dicti.get)


def problema2(dir_path):
    my_list = []
    files = os.listdir(dir_path)
    for file in files:
        full_path=os.path.join(dir_path, file)
        if os.path.isfile(full_path):
            my_list.append(file)
    return sorted(my_list)

def problema3(my_path):
    while True:
        with open(my_path) as my_json:
            data_json = json.load(my_json)
        if "next" in data_json:
            my_path = data_json["next"]
        else:
            return os.path.getsize(my_path)

def problema4(dir_path, to_find):
    my_vec = []
    for root, directories, files in os.walk(dir_path):
        for file in files:
            full_path = os.path.join(root, file)
            with open(full_path, "rb") as fd:
                abs_file = os.path.abspath(file)
                hasher = hashlib.sha1()
                hasher.update(fd.read())
                hash = hasher.hexdigest()
                print(hash)
                if hash == to_find:
                    my_vec.append(abs_file)
    return sorted(my_vec)