#!/usr/bin/env python3

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

from decimal import Decimal
from solana.publickey import PublicKey

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="Liquidate a single margin account.")
mango.ContextBuilder.add_command_line_parameters(parser)
mango.Wallet.add_command_line_parameters(parser)
parser.add_argument("--address", type=PublicKey,
                    help="Solana address of the Mango Markets margin account to be liquidated")
parser.add_argument("--notify-liquidations", type=mango.parse_notification_target, action="append", default=[],
                    help="The notification target for liquidation events")
parser.add_argument("--notify-successful-liquidations", type=mango.parse_notification_target,
                    action="append", default=[], help="The notification target for successful liquidation events")
parser.add_argument("--notify-failed-liquidations", type=mango.parse_notification_target,
                    action="append", default=[], help="The notification target for failed liquidation events")
parser.add_argument("--notify-errors", type=mango.parse_notification_target, action="append", default=[],
                    help="The notification target for error events")
parser.add_argument("--dry-run", action="store_true", default=False,
                    help="runs as read-only and does not perform any transactions")
args: argparse.Namespace = mango.parse_args(parser)

handler = mango.NotificationHandler(mango.CompoundNotificationTarget(args.notify_errors))
handler.setLevel(logging.ERROR)
logging.getLogger().addHandler(handler)

try:
    context = mango.ContextBuilder.from_command_line_parameters(args)
    wallet = mango.Wallet.from_command_line_parameters_or_raise(args)
    account_address = args.address
    liquidator_name = args.name

    logging.info(f"Wallet address: {wallet.address}")
    logging.info(f"Margin account address: {account_address}")

    group = mango.Group.load(context)

    logging.info("Checking wallet accounts.")
    scout = mango.AccountScout()
    report = scout.verify_account_prepared_for_group(context, group, wallet.address)
    logging.info(f"Wallet account report: {report}")
    if report.has_errors:
        raise Exception(f"Account '{wallet.address}' is not prepared for group '{group.address}'.")

    logging.info("Wallet accounts OK.")

    liquidations_publisher = mango.EventSource[mango.LiquidationEvent]()
    liquidations_publisher.subscribe(on_next=mango.CompoundNotificationTarget(
        args.notify_liquidations).send)  # type: ignore[call-arg]

    on_success = mango.FilteringNotificationTarget(
        mango.CompoundNotificationTarget(args.notify_successful_liquidations),
        lambda item: isinstance(item, mango.LiquidationEvent) and item.succeeded)
    liquidations_publisher.subscribe(on_next=on_success.send)  # type: ignore[call-arg]

    on_failed = mango.FilteringNotificationTarget(
        mango.CompoundNotificationTarget(args.notify_failed_liquidations),
        lambda item: isinstance(item, mango.LiquidationEvent) and not item.succeeded)
    liquidations_publisher.subscribe(on_next=on_failed.send)  # type: ignore[call-arg]

    # TODO: Add proper liquidator classes here when they're written for V3
    if args.dry_run:
        account_liquidator: mango.AccountLiquidator = mango.NullAccountLiquidator()
    else:
        account_liquidator = mango.NullAccountLiquidator()

    # TODO - fetch prices when available for V3.
    # prices = group.fetch_token_prices(context)
    account = mango.Account.load(context, account_address, group)
    worthwhile_threshold = Decimal(0)  # No threshold - don't take this into account.
    liquidatable_report = mango.LiquidatableReport.build(group, [], account, worthwhile_threshold)
    transaction_ids = account_liquidator.liquidate(liquidatable_report)
    if transaction_ids is None or len(transaction_ids) == 0:
        print("No transaction sent.")
    else:
        print("Transaction ID:", transaction_ids)
        print("Waiting for confirmation...")

        context.client.wait_for_confirmation(transaction_ids)

        for transaction_id in transaction_ids:
            transaction_scout = mango.TransactionScout.load(context, transaction_id)
            print(str(transaction_scout))

except Exception as exception:
    logging.critical(f"Liquidator stopped because of exception: {exception} - {traceback.format_exc()}")
except:
    logging.critical(f"Liquidator stopped because of uncatchable error: {traceback.format_exc()}")
finally:
    logging.info("Liquidation complete.")