# -*- coding: utf-8 -*-

import hashlib


def encode_sha256(text_origin, encoding='utf-8'):
    """
    function to decode the text into string key.
    with sha256 algorithm.

    :param `text` is plain text to encode.
    :return a dict of origin keys & output keys.
    :example
        >>> encode_sha256('saya')
        {'origin': '3874c0168198d8950ea30963ac3657f6c5eff842503e1ee0125ab111696d74dc',
         'output': '8879x0668698d8900ez80968zx8607f6x0eff897008e6ee0670zy666696d79dx'}
    """
    text_origin = str(text_origin)
    hash_origin = hashlib.sha256(text_origin.encode(encoding)).hexdigest()
    hash_output = hash_origin

    tokens = ['1', '2', '3', '4', '5', 'a', 'b', 'c']
    replacers = ['6', '7', '8', '9', '0', 'z', 'y', 'x']

    for (token, replacer) in zip(tokens, replacers):
        hash_output = hash_output.replace(token, replacer)

    return dict(origin=hash_origin, output=hash_output)


def validate_sha256(text_origin, text_encoded):
    """
    function to validate the plain text
    with hashed output of the key, it valid or not.

    :param `text_origin` is string plain text to validate.
    :param `text_encoded` is string hashed output from `encode_sha256`.
    :example
        >>> validate_sha256('saya', '8879x0668698d8900ez80968zx8607f6x0eff897008e6ee0670zy666696d79dx')
        True
        >>> validate_sha256('saya', '3874c0168198d8950ea30963ac3657f6c5eff842503e1ee0125ab111696d74dc')
        False
    """
    return encode_sha256(text_origin).get('output') == text_encoded