# standard imports
import os
import logging
import urllib.parse
import urllib.error
import urllib.request
import json

# external imports
import celery
import psycopg2
from psycopg2 import extras
from hexathon import (
        strip_0x,
        add_0x,
        )
from chainlib.eth.address import to_checksum_address
from chainlib.eth.tx import (
        unpack,
        raw,
        )
from cic_types.processor import generate_metadata_pointer
from cic_types.models.person import Person

#logg = logging.getLogger().getChild(__name__)
logg = logging.getLogger()

celery_app = celery.current_app


class ImportTask(celery.Task):

    balances = None
    import_dir = 'out'
    count = 0
    chain_spec = None
    balance_processor = None
    max_retries = None

class MetadataTask(ImportTask):

    meta_host = None
    meta_port = None
    meta_path = ''
    meta_ssl = False
    autoretry_for = (
            urllib.error.HTTPError,
            OSError,
            )
    retry_jitter = True
    retry_backoff = True
    retry_backoff_max = 60

    @classmethod
    def meta_url(self):
        scheme = 'http'
        if self.meta_ssl:
            scheme += s
        url = urllib.parse.urlparse('{}://{}:{}/{}'.format(scheme, self.meta_host, self.meta_port, self.meta_path))
        return urllib.parse.urlunparse(url)


def old_address_from_phone(base_path, phone):
    pidx = generate_metadata_pointer(phone.encode('utf-8'), ':cic.phone')
    phone_idx_path = os.path.join('{}/phone/{}/{}/{}'.format(
            base_path,
            pidx[:2],
            pidx[2:4],
            pidx,
            )
        )
    f = open(phone_idx_path, 'r')
    old_address = f.read()
    f.close()

    return old_address


@celery_app.task(bind=True, base=MetadataTask)
def resolve_phone(self, phone):
    identifier = generate_metadata_pointer(phone.encode('utf-8'), ':cic.phone')
    url = urllib.parse.urljoin(self.meta_url(), identifier)
    logg.debug('attempt getting phone pointer at {} for phone {}'.format(url, phone))
    r = urllib.request.urlopen(url)
    address = json.load(r)
    address = address.replace('"', '')
    logg.debug('address {} for phone {}'.format(address, phone))

    return address


@celery_app.task(bind=True, base=MetadataTask)
def generate_metadata(self, address, phone):
    old_address = old_address_from_phone(self.import_dir, phone)

    logg.debug('>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> foo')
    logg.debug('address {}'.format(address))
    old_address_upper = strip_0x(old_address).upper()
    metadata_path = '{}/old/{}/{}/{}.json'.format(
            self.import_dir,
            old_address_upper[:2],
            old_address_upper[2:4],
            old_address_upper,
            )

    f = open(metadata_path, 'r')
    o = json.load(f)
    f.close()

    u = Person.deserialize(o)

    if u.identities.get('evm') == None:
        u.identities['evm'] = {}
    sub_chain_str = '{}:{}'.format(self.chain_spec.common_name(), self.chain_spec.network_id())
    u.identities['evm'][sub_chain_str] = [add_0x(address)]

    new_address_clean = strip_0x(address)
    filepath = os.path.join(
            self.import_dir,
            'new',
            new_address_clean[:2].upper(),
            new_address_clean[2:4].upper(),
            new_address_clean.upper() + '.json',
            )
    os.makedirs(os.path.dirname(filepath), exist_ok=True)

    o = u.serialize()
    f = open(filepath, 'w')
    f.write(json.dumps(o))
    f.close()

    meta_key = generate_metadata_pointer(bytes.fromhex(new_address_clean), ':cic.person')
    meta_filepath = os.path.join(
            self.import_dir,
            'meta',
            '{}.json'.format(new_address_clean.upper()),
            )
    os.symlink(os.path.realpath(filepath), meta_filepath)

    logg.debug('found metadata {} for phone {}'.format(o, phone))

    return address


@celery_app.task(bind=True, base=MetadataTask)
def opening_balance_tx(self, address, phone, serial):


    old_address = old_address_from_phone(self.import_dir, phone)
  
    k = to_checksum_address(strip_0x(old_address))
    balance = self.balances[k]
    logg.debug('found balance {} for address {} phone {}'.format(balance, old_address, phone))

    decimal_balance = self.balance_processor.get_decimal_amount(int(balance))

    (tx_hash_hex, o) = self.balance_processor.get_rpc_tx(address, decimal_balance, serial)

    tx = unpack(bytes.fromhex(strip_0x(o)), self.chain_spec)
    logg.debug('generated tx token value {} to {} tx hash {}'.format(decimal_balance, address, tx_hash_hex))

    tx_path = os.path.join(
            self.import_dir,
            'txs',
            strip_0x(tx_hash_hex),
            )
            
    f = open(tx_path, 'w')
    f.write(strip_0x(o))
    f.close()

    tx_nonce_path = os.path.join(
            self.import_dir,
            'txs',
            '.' + str(tx['nonce']),
            )
    os.symlink(os.path.realpath(tx_path), tx_nonce_path)

    return tx['hash']


@celery_app.task(bind=True, base=ImportTask, autoretry_for=(FileNotFoundError,), max_retries=None, default_retry_delay=0.1)
def send_txs(self, nonce):

    if nonce == self.count + self.balance_processor.nonce_offset:
        logg.info('reached nonce {} (offset {} + count {}) exiting'.format(nonce, self.balance_processor.nonce_offset, self.count))
        return


    logg.debug('attempt to open symlink for nonce {}'.format(nonce))
    tx_nonce_path = os.path.join(
            self.import_dir,
            'txs',
            '.' + str(nonce),
            )
    f = open(tx_nonce_path, 'r')
    tx_signed_raw_hex = f.read()
    f.close()

    os.unlink(tx_nonce_path)

    o = raw(add_0x(tx_signed_raw_hex))
    tx_hash_hex = self.balance_processor.conn.do(o)

    logg.info('sent nonce {} tx hash {}'.format(nonce, tx_hash_hex)) #tx_signed_raw_hex))

    nonce += 1

    queue = self.request.delivery_info.get('routing_key')
    s = celery.signature(
            'import_task.send_txs',
            [
                nonce,
                ],
            queue=queue,
            )
    s.apply_async()


    return nonce


@celery_app.task
def set_pins(config: dict, phone_to_pins: list):
    # define db connection
    db_conn = psycopg2.connect(
        database=config.get('database'),
        host=config.get('host'),
        port=config.get('port'),
        user=config.get('user'),
        password=config.get('password')
    )
    db_cursor = db_conn.cursor()

    # batch updates
    extras.execute_values(db_cursor,
                          'UPDATE account \
                          SET password_hash = update_data.password_hash \
                          FROM (VALUES %s) AS update_data (phone, password_hash) \
                          WHERE phone_number = update_data.phone', phone_to_pins)
    db_conn.commit()

    db_cursor.close()
    db_conn.close()