#!/usr/bin/env pyston3

import argparse
import logging
import os
import os.path
import sys
import traceback
import typing

from decimal import Decimal

sys.path.insert(0, os.path.abspath(
    os.path.join(os.path.dirname(__file__), "..")))
import mango  # nopep8

# We explicitly want argument parsing to be outside the main try-except block because some arguments
# (like --help) will cause an exit, which our except: block traps.
parser = argparse.ArgumentParser(
    description="Balance the value of tokens in a Mango Markets group to specific values or percentages.")
mango.ContextBuilder.add_command_line_parameters(parser)
mango.Wallet.add_command_line_parameters(parser)
parser.add_argument("--target", type=str, action="append", required=True,
                    help="token symbol plus target value or percentage, separated by a colon (e.g. 'ETH:2.5')")
parser.add_argument("--action-threshold", type=Decimal, default=Decimal("0.01"),
                    help="fraction of total wallet value a trade must be above to be carried out")
parser.add_argument("--adjustment-factor", type=Decimal, default=Decimal("0.05"),
                    help="factor by which to adjust the SELL price (akin to maximum slippage)")
parser.add_argument("--dry-run", action="store_true", default=False,
                    help="runs as read-only and does not perform any transactions")
args = parser.parse_args()

logging.getLogger().setLevel(args.log_level)
logging.warning(mango.WARNING_DISCLAIMER_TEXT)

try:
    context = mango.ContextBuilder.from_command_line_parameters(args)
    wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
    action_threshold = args.action_threshold
    adjustment_factor = args.adjustment_factor

    logging.info(f"Context: {context}")
    logging.info(f"Wallet address: {wallet.address}")

    group = mango.Group.load(context)
    tokens = [token_info.token for token_info in group.tokens if token_info is not None]

    balance_parser = mango.TargetBalanceParser(tokens)
    targets = list(map(balance_parser.parse, args.target))
    logging.info(f"Targets: {targets}")

    # TODO - fetch prices when available for V3.
    # prices = group.fetch_token_prices(context)
    prices: typing.Sequence[mango.TokenValue] = []
    logging.info(f"Prices: {prices}")

    if args.dry_run:
        trade_executor: mango.TradeExecutor = mango.NullTradeExecutor(print)
    else:
        trade_executor = mango.ImmediateTradeExecutor(context, wallet, None, adjustment_factor, print)

    wallet_balancer = mango.LiveWalletBalancer(
        context, wallet, group, trade_executor, action_threshold, tokens, targets)
    wallet_balancer.balance(prices)

    logging.info("Balancing completed.")
except Exception as exception:
    logging.critical(f"Balancing stopped because of exception: {exception} - {traceback.format_exc()}")
except:
    logging.critical(f"Balancing stopped because of uncatchable error: {traceback.format_exc()}")