from datetime import datetime
import argparse
import configparser
import psycopg2
import os
import sys

import market
import portfolio

__all__ = ["make_order", "get_user_market"]

def make_order(market, value, currency, action="acquire",
        close_if_possible=False, base_currency="BTC", follow=True,
        compute_value="average"):
    """
    Make an order on market
    "market": The market on which to place the order
    "value": The value in *base_currency* to acquire,
             or in *currency* to dispose.
             use negative for margin trade.
    "action": "acquire" or "dispose".
                "acquire" will buy long or sell short,
                "dispose" will sell long or buy short.
    "currency": The currency to acquire or dispose
    "base_currency": The base currency. The value is expressed in that
                     currency (default: BTC)
    "follow": Whether to follow the order once run (default: True)
    "close_if_possible": Whether to try to close the position at the end
                         of the trade, i.e. reach exactly 0 at the end
                         (only meaningful in "dispose"). May have
                         unwanted effects if the end value of the
                         currency is not 0.
    "compute_value": Compute value to place the order
    """
    market.report.log_stage("make_order_begin")
    market.balances.fetch_balances(tag="make_order_begin")
    if action == "acquire":
        trade = portfolio.Trade(
                portfolio.Amount(base_currency, 0),
                portfolio.Amount(base_currency, value),
                currency, market)
    else:
        amount = portfolio.Amount(currency, value)
        trade = portfolio.Trade(
                amount.in_currency(base_currency, market, compute_value=compute_value),
                portfolio.Amount(base_currency, 0),
                currency, market)
    market.trades.all.append(trade)
    order = trade.prepare_order(
            close_if_possible=close_if_possible,
            compute_value=compute_value)
    market.report.log_orders([order], None, compute_value)
    market.trades.run_orders()
    if follow:
        market.follow_orders()
        market.balances.fetch_balances(tag="make_order_end")
    else:
        market.report.log_stage("make_order_end_not_followed")
        return order
    market.report.log_stage("make_order_end")

def get_user_market(config_path, user_id, debug=False):
    pg_config, report_path = parse_config(config_path)
    market_config = list(fetch_markets(pg_config, str(user_id)))[0][0]
    args = type('Args', (object,), { "debug": debug, "quiet": False })()
    return market.Market.from_config(market_config, args, user_id=user_id, report_path=report_path)

def fetch_markets(pg_config, user):
    connection = psycopg2.connect(**pg_config)
    cursor = connection.cursor()

    if user is None:
        cursor.execute("SELECT config,user_id FROM market_configs")
    else:
        cursor.execute("SELECT config,user_id FROM market_configs WHERE user_id = %s", user)

    for row in cursor:
        yield row

def parse_config(config_file):
    config = configparser.ConfigParser()
    config.read(config_file)

    if "postgresql" not in config:
        print("no configuration for postgresql in config file")
        sys.exit(1)

    if "app" in config and "report_path" in config["app"]:
        report_path = config["app"]["report_path"]

        if not os.path.exists(report_path):
            os.makedirs(report_path)
    else:
        report_path = None

    return [config["postgresql"], report_path]

def parse_args(argv):
    parser = argparse.ArgumentParser(
            description="Run the trade bot")

    parser.add_argument("-c", "--config",
            default="config.ini",
            required=False,
            help="Config file to load (default: config.ini)")
    parser.add_argument("--before",
            default=False, action='store_const', const=True,
            help="Run the steps before the cryptoportfolio update")
    parser.add_argument("--after",
            default=False, action='store_const', const=True,
            help="Run the steps after the cryptoportfolio update")
    parser.add_argument("--quiet",
            default=False, action='store_const', const=True,
            help="Don't print messages")
    parser.add_argument("--debug",
            default=False, action='store_const', const=True,
            help="Run in debug mode")
    parser.add_argument("--user",
            default=None, required=False, help="Only run for that user")
    parser.add_argument("--action",
            action='append',
            help="Do a different action than trading (add several times to chain)")
    parser.add_argument("--parallel", action='store_true', default=True, dest="parallel")
    parser.add_argument("--no-parallel", action='store_false', dest="parallel")

    args = parser.parse_args(argv)

    if not os.path.exists(args.config):
        print("no config file found, exiting")
        sys.exit(1)

    return args

def process(market_config, user_id, report_path, args):
    try:
        market.Market\
                .from_config(market_config, args, user_id=user_id, report_path=report_path)\
                .process(args.action, before=args.before, after=args.after)
    except Exception as e:
        print("{}: {}".format(e.__class__.__name__, e))

def main(argv):
    args = parse_args(argv)

    pg_config, report_path = parse_config(args.config)

    if args.parallel:
        import threading
        market.Portfolio.start_worker()

        for market_config, user_id in fetch_markets(pg_config, args.user):
            threading.Thread(target=process, args=[market_config, user_id, report_path, args]).start()
    else:
        for market_config, user_id in fetch_markets(pg_config, args.user):
            process(market_config, user_id, report_path, args)

if __name__ == '__main__': # pragma: no cover
    main(sys.argv[1:])