# https://httpd.apache.org/docs/2.4/misc/password_encryptions.html
# https://www.askapache.com/online-tools/htpasswd-generator/

from tarpncalctg.custom import CustomBase
from tarpncalctg import api
import base64
import hashlib

_ = api.t


class htpasswd_sha1(CustomBase):
    stack = None
    
    def __init__(self, stack):
        self.stack = stack
    # __init__
    
    def help(self):
        msg =  "<h2>htpasswd_sha1</h2>"
        msg += "<p>Takes r0 (password) from the stack</p>"
        msg += "<p>Takes r1 (username) from the stack</p>"
        msg += "<p>Calculates the htpasswd_sha1</p>"
        msg += "<p>Pushes the result to r0</p>"
        api.show_popup('Custom function', msg)
        # If you want to implement translated texts, you can define the texts in customFunctions.translations/htpasswd_sha1/*.yml
        # and then reference them using the _(textKey) function:
        # api.show_popup('Custom function', _('taRpnCalcTG.CustomFunctions.htpasswd_sha1.btnHLP'))
    # help

    def calculate(self):
        if self.stack.inputMode != 'TEXT':
            api.toast('This operation is only supported in TEXT mode')
            # api.toast(_('taRpnCalcTG.CustomFunctions.htpasswd_sha1.onlySupportedInDEC'))
            return
        if self.stack.finish_entry() == -1: 
            return  # abort here because data in input line is invalid
        if self.stack.size() < 2:
            api.toast('This operation needs 2 argument')
            # api.toast(_('taRpnCalcTG.CustomFunctions.htpasswd_sha1.argumentsNeeded', count=1))
            return
        # do the calculation and return result to the stack
        r0 = str(self.stack.get_register(0))
        r1 = str(self.stack.get_register(1))
        m = hashlib.sha1()
        m.update(bytes(r0, 'utf-8'))
        hashbytes = m.digest()
        b64 = base64.standard_b64encode(hashbytes)
        result = r1 + ":{SHA}" + format(b64)[2:-1]
        self.stack.pop(2)
        self.stack.push(result)
    # calculate
    
# htpasswd_sha1