import dataclasses
import datetime
import email.utils
import json
import logging
from collections.abc import Iterator, Mapping
from decimal import Decimal

from frozendict import frozendict

from personal_data.data import DeduplicateMode, Scraper

from .. import secrets

logger = logging.getLogger(__name__)


# mainnet: https://reader.partisiablockchain.com
# testnet: https://node1.testnet.partisiablockchain.com


HOSTNAME = 'reader.partisiablockchain.com'

URL_ACCOUNT_PLUGIN = 'https://{hostname}/{shard}blockchain/accountPlugin/local'
URL_ACCOUNT_PLUGIN_GLOBAL = 'https://{hostname}/{shard}blockchain/accountPlugin/global'


def shard_id_for_address(address: str) -> str:
    return 'shards/Shard2/'  # TODO


@dataclasses.dataclass(frozen=True)
class MpcBalance(Scraper):
    dataset_name = 'defi_mpc_balance'
    deduplicate_mode = DeduplicateMode.ONLY_LATEST
    deduplicate_ignore_columns = ['account.update_time']

    def get_json(self, url: str, data: dict) -> tuple[dict, datetime.datetime]:
        headers = {
            'Content-Type': 'application/json',
            'Accept': 'application/json',
        }

        response = self.session.post(url, headers=headers, data=json.dumps(data))
        response.raise_for_status()
        date_text = response.headers.get('last-modified') or response.headers.get(
            'date',
        )
        date = email.utils.parsedate_to_datetime(date_text)
        json_data = response.json()
        if json_data is None:
            msg = 'No result data for ' + url
            raise Exception(msg)
        return json_data, date

    def determine_coins(self) -> list[dict]:
        data: dict = {'path': []}

        url = URL_ACCOUNT_PLUGIN_GLOBAL.format(
            hostname=HOSTNAME,
            shard='',
        )

        json_data, date = self.get_json(url, data=data)
        return json_data['coins']['coins']

    def scrape_latest_values_for(self, address: str) -> frozendict[str, object]:
        coins = self.determine_coins()

        url = URL_ACCOUNT_PLUGIN.format(
            hostname=HOSTNAME,
            shard=shard_id_for_address(address),
        )

        data: dict = {
            'path': [
                {'type': 'field', 'name': 'accounts'},
                {'type': 'avl', 'keyType': 'BLOCKCHAIN_ADDRESS', 'key': address},
            ],
        }
        account_data, date = self.get_json(url, data=data)

        data_point = {
            'account.address': address,
            'account.update_time': date,
        }

        data_point['balance.MPC'] = Decimal(account_data['mpcTokens']) / 1000

        for coin_idx, amount_data in enumerate(account_data['accountCoins']):
            coin_data = coins[coin_idx]
            byoc_balance = Decimal(amount_data['balance'])
            denominator = Decimal(coin_data['conversionRate']['denominator'])
            native_balance = byoc_balance / denominator
            data_point['balance.' + coin_data['symbol']] = native_balance
            del coin_idx, coin_data

        return frozendict(data_point)

    def scrape(self) -> Iterator[Mapping[str, object]]:
        yield self.scrape_latest_values_for(secrets.PBC_ACCOUNT_ADDRESS)