import logging
import sys
from collections import defaultdict
from datetime import datetime, timedelta
from typing import Any, Dict, List

from freqtrade.configuration import TimeRange, setup_utils_configuration
from freqtrade.data.converter import convert_ohlcv_format, convert_trades_format
from freqtrade.data.history import (convert_trades_to_ohlcv, refresh_backtest_ohlcv_data,
                                    refresh_backtest_trades_data)
from freqtrade.exceptions import OperationalException
from freqtrade.exchange import timeframe_to_minutes
from freqtrade.plugins.pairlist.pairlist_helpers import expand_pairlist
from freqtrade.resolvers import ExchangeResolver
from freqtrade.state import RunMode


logger = logging.getLogger(__name__)


def start_download_data(args: Dict[str, Any]) -> None:
    """
    Download data (former download_backtest_data.py script)
    """
    config = setup_utils_configuration(args, RunMode.UTIL_EXCHANGE)

    if 'days' in config and 'timerange' in config:
        raise OperationalException("--days and --timerange are mutually exclusive. "
                                   "You can only specify one or the other.")
    timerange = TimeRange()
    if 'days' in config:
        time_since = (datetime.now() - timedelta(days=config['days'])).strftime("%Y%m%d")
        timerange = TimeRange.parse_timerange(f'{time_since}-')

    if 'timerange' in config:
        timerange = timerange.parse_timerange(config['timerange'])

    # Remove stake-currency to skip checks which are not relevant for datadownload
    config['stake_currency'] = ''

    if 'pairs' not in config:
        raise OperationalException(
            "Downloading data requires a list of pairs. "
            "Please check the documentation on how to configure this.")

    pairs_not_available: List[str] = []

    # Init exchange
    exchange = ExchangeResolver.load_exchange(config['exchange']['name'], config, validate=False)
    # Manual validations of relevant settings
    exchange.validate_pairs(config['pairs'])
    expanded_pairs = expand_pairlist(config['pairs'], list(exchange.markets))

    logger.info(f"About to download pairs: {expanded_pairs}, "
                f"intervals: {config['timeframes']} to {config['datadir']}")

    for timeframe in config['timeframes']:
        exchange.validate_timeframes(timeframe)

    try:

        if config.get('download_trades'):
            pairs_not_available = refresh_backtest_trades_data(
                exchange, pairs=expanded_pairs, datadir=config['datadir'],
                timerange=timerange, erase=bool(config.get('erase')),
                data_format=config['dataformat_trades'])

            # Convert downloaded trade data to different timeframes
            convert_trades_to_ohlcv(
                pairs=expanded_pairs, timeframes=config['timeframes'],
                datadir=config['datadir'], timerange=timerange, erase=bool(config.get('erase')),
                data_format_ohlcv=config['dataformat_ohlcv'],
                data_format_trades=config['dataformat_trades'],
            )
        else:
            pairs_not_available = refresh_backtest_ohlcv_data(
                exchange, pairs=expanded_pairs, timeframes=config['timeframes'],
                datadir=config['datadir'], timerange=timerange, erase=bool(config.get('erase')),
                data_format=config['dataformat_ohlcv'])

    except KeyboardInterrupt:
        sys.exit("SIGINT received, aborting ...")

    finally:
        if pairs_not_available:
            logger.info(f"Pairs [{','.join(pairs_not_available)}] not available "
                        f"on exchange {exchange.name}.")


def start_convert_data(args: Dict[str, Any], ohlcv: bool = True) -> None:
    """
    Convert data from one format to another
    """
    config = setup_utils_configuration(args, RunMode.UTIL_NO_EXCHANGE)
    if ohlcv:
        convert_ohlcv_format(config,
                             convert_from=args['format_from'], convert_to=args['format_to'],
                             erase=args['erase'])
    else:
        convert_trades_format(config,
                              convert_from=args['format_from'], convert_to=args['format_to'],
                              erase=args['erase'])


def start_list_data(args: Dict[str, Any]) -> None:
    """
    List available backtest data
    """

    config = setup_utils_configuration(args, RunMode.UTIL_NO_EXCHANGE)

    from tabulate import tabulate

    from freqtrade.data.history.idatahandler import get_datahandler
    dhc = get_datahandler(config['datadir'], config['dataformat_ohlcv'])

    paircombs = dhc.ohlcv_get_available_data(config['datadir'])

    if args['pairs']:
        paircombs = [comb for comb in paircombs if comb[0] in args['pairs']]

    print(f"Found {len(paircombs)} pair / timeframe combinations.")
    groupedpair = defaultdict(list)
    for pair, timeframe in sorted(paircombs, key=lambda x: (x[0], timeframe_to_minutes(x[1]))):
        groupedpair[pair].append(timeframe)

    if groupedpair:
        print(tabulate([(pair, ', '.join(timeframes)) for pair, timeframes in groupedpair.items()],
                       headers=("Pair", "Timeframe"),
                       tablefmt='psql', stralign='right'))
