#!/usr/bin/env python3
# -*-coding:UTF-8 -*

import os
import sys
import redis

from hashlib import sha256

sys.path.append(os.path.join(os.environ['AIL_FLASK'], 'modules'))
import Flask_config
from Correlation import Correlation

r_serv_metadata = Flask_config.r_serv_metadata

digits58 = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
#address_validation = {'bitcoin': 'base58', 'dash': 'base58'}

cryptocurrency = Correlation('cryptocurrency')

# http://rosettacode.org/wiki/Bitcoin/address_validation#Python
def decode_base58(bc, length):
    n = 0
    for char in bc:
        n = n * 58 + digits58.index(char)
    return n.to_bytes(length, 'big')

# http://rosettacode.org/wiki/Bitcoin/address_validation#Python
def check_base58_address(bc):
    try:
        bcbytes = decode_base58(bc, 25)
        return bcbytes[-4:] == sha256(sha256(bcbytes[:-4]).digest()).digest()[:4]
    except Exception:
        return False

def verify_cryptocurrency_address(cryptocurrency_type, cryptocurrency_address):
    if cryptocurrency_type in ('bitcoin', 'litecoin', 'dash'):
        return check_base58_address(cryptocurrency_address)
    else:
        return True


def get_cryptocurrency(request_dict, cryptocurrency_type):
    # basic verification
    res = cryptocurrency.verify_correlation_field_request(request_dict, cryptocurrency_type)
    if res:
        return res
    # cerify address
    field_name = request_dict.get(cryptocurrency_type)
    if not verify_cryptocurrency_address(cryptocurrency_type, field_name):
        return ( {'status': 'error', 'reason': 'Invalid Cryptocurrency address'}, 400 )

    return cryptocurrency.get_correlation(request_dict, cryptocurrency_type, field_name)

def save_cryptocurrency_data(cryptocurrency_name, date, item_path, cryptocurrency_address):
    # create basic medata
    if not r_serv_metadata.exists('cryptocurrency_metadata_{}:{}'.format(cryptocurrency_name, cryptocurrency_address)):
        r_serv_metadata.hset('cryptocurrency_metadata_{}:{}'.format(cryptocurrency_name, cryptocurrency_address), 'first_seen', date)
        r_serv_metadata.hset('cryptocurrency_metadata_{}:{}'.format(cryptocurrency_name, cryptocurrency_address), 'last_seen', date)
    else:
        last_seen = r_serv_metadata.hget('cryptocurrency_metadata_{}:{}'.format(cryptocurrency_name, cryptocurrency_address), 'last_seen')
        if not last_seen:
            r_serv_metadata.hset('cryptocurrency_metadata_{}:{}'.format(cryptocurrency_name, cryptocurrency_address), 'last_seen', date)
        else:
            if int(last_seen) < int(date):
                r_serv_metadata.hset('cryptocurrency_metadata_{}:{}'.format(cryptocurrency_name, cryptocurrency_address), 'last_seen', date)

    # global set
    r_serv_metadata.sadd('set_cryptocurrency_{}:{}'.format(cryptocurrency_name, cryptocurrency_address), item_path)

    # daily
    r_serv_metadata.hincrby('cryptocurrency:{}:{}'.format(cryptocurrency_name, date), cryptocurrency_address, 1)

    # all type
    r_serv_metadata.zincrby('cryptocurrency_all:{}'.format(cryptocurrency_name), cryptocurrency_address, 1)

    # item_metadata
    r_serv_metadata.sadd('item_cryptocurrency_{}:{}'.format(cryptocurrency_name, item_path), cryptocurrency_address)