import random
import string
import math
import numpy
import re
import classes.Cli as Cli

class Generate:
    
    def __init__(self, amount_of_secret_holders, decryption_quota):
        self.amount_of_secret_holders = amount_of_secret_holders
        self.decryption_quota = decryption_quota
        self.decrypted_master_password_file_path="data/decrypted/password_files/master-password.txt"
        self.quota_factor=self.decryption_quota/100
        self.group_members_amount=math.ceil(self.amount_of_secret_holders * self.quota_factor)
        self.cli = Cli.Cli()
        
    def getStartnumber(self):
        index = 0
        start_number = ''
        while index < self.group_members_amount:
            start_number += '1'
            index += 1
        return int(start_number)

    def getEndnumber(self):
        index = 0
        start_number = ''
        while index < self.group_members_amount:
            start_number += str(self.amount_of_secret_holders)
            index += 1
        return int(start_number)

    def savePassword(self,password,password_file_path):
        print("Saving password to: " + password_file_path)
        master_password_file = open(password_file_path, "a")
        master_password_file.seek(0)
        master_password_file.truncate()
        master_password_file.write(password)
        master_password_file.close()
    
    def getPassword(self):
        characters = string.ascii_letters + string.digits
        return ''.join(random.choice(characters) for i in range(int(64*self.quota_factor))).upper()
    
    def isGroupValid(self,password_group_index_str):
        width= range(1,(self.amount_of_secret_holders+1))
        regex="([" + ','.join([str(x) for x in width]) + "]{" + str(self.group_members_amount) + "})"
        valid_numbers = re.compile(regex)
        unvalid_sequenz = re.compile("(.)\\1+")
        return re.search(valid_numbers, password_group_index_str) and not re.search(unvalid_sequenz, password_group_index_str)
    
    def execute(self):
        index = self.getStartnumber()
        password_groups = {}
        while index < self.getEndnumber():
            password_group_index_str = ''.join(sorted(str(index)))
            if self.isGroupValid(password_group_index_str):
                password_group_index_int = int(password_group_index_str)
                if not password_group_index_int in password_groups:
                    password_index = 1
                    password_groups[password_group_index_int] = {}
                    password_groups[password_group_index_int]['members'] = {}
                    password_groups[password_group_index_int]['password'] = '' 
                    password = ''
                    for secret_holder_index in password_group_index_str:
                        password_groups[password_group_index_int]['members'][secret_holder_index]={}
                        password_part = self.getPassword()
                        password_groups[password_group_index_int]['members'][secret_holder_index]['password_part'] = password_part
                        password_groups[password_group_index_int]['members'][secret_holder_index]['password_index'] = password_index
                        password += password_part
                        password_index += 1
                    password_groups[password_group_index_int]['password'] += password
                    decrypted_splitted_password_file = "data/decrypted/splitted_password_files/" + password_group_index_str + ".txt"
                    encrypted_splitted_password_file = "data/encrypted/splitted_password_files/" + password_group_index_str + ".txt.gpg"
                    self.cli.executeCommand('cp -v "' + self.decrypted_master_password_file_path + '" "' + decrypted_splitted_password_file + '" && gpg --batch --passphrase "' + password + '" -c "' + decrypted_splitted_password_file   + '"')
                    print(self.cli.getCommandString())
            index += 1