"""# Automatic Crypto Seller.

This is a system for automatically trading individual financial assets a single
way, by using repeated trades over a period.

The primary motivation is for trading low-volume crypto assets without
affecting the price too much.

Supported sites:

- [KuCoin](https://www.kucoin.com/): Online crypto-currency exchange.

## Installation

Install dependencies:

```shell
pip install -r requirements.txt
```

## Usage

Configure the sell rate:

Todo:
----
Run using from the top directory:

```shell
python -m crypto_seller
```

The script will now automatically sell assets over time. The interval between
sell-offs are randomized to avoid front-running, and the amounts are also
randomized to avoid too consistent behaviour.

The log will both be displayed in the shell, and be placed in a log file
`output/log.txt`. Every sell-off will be logged to the `output/trades.csv`
file, with as much information as possible. Keep both of these for tax
purposes, if relevant.

Todo:
----
## Auditing information

The most relevant libraries for auditing are:

- [`fin_depo`](https://gitfub.space/Jmaa/fin-depo): Library for programmatic
  fetching of depository assets and in some cases allows for order placement.
  This is the library that reads balances and places market orders.
- [`fin_defs`](https://gitfub.space/Jmaa/fin-defs): Definitions of financial
  assets and instruments. Used by `fin_depo`.
- [`python-kucoin`](https://python-kucoin.readthedocs.io/en/latest/) is used by
  `fin_depo` for providing KuCoin support.

Todo

## Taxation

Some parts of the world suffers from weird and draconian taxation rules on
cryptocurrencies, so it helps to keep track of the relevant trading
information.

As mentioned above, keep (and backup) both the log file (`output/log.txt`) and
the trades file (`output/trades.csv`).

To help with tax reporting, it might be useful to sign up to tax oriented
websites. For example, [CryptoSkat](https://cryptoskat.dk/) seems to be the
most mature on the danish market, and does support KuCoin.
"""

__all__ = ['__version__', 'run_auto_sell']

import dataclasses
import datetime
import logging
import random
import time
from decimal import Decimal
from pathlib import Path
from typing import Any

import fin_defs
import fin_depo

from . import config
from ._version import __version__

logger = logging.getLogger(__name__)

################################################################################
# Constants #

PATH_OUTPUT = Path('./output').absolute()
PATH_LOG_FILE = PATH_OUTPUT / 'log.txt'
PATH_TRADES_FILE = PATH_OUTPUT / 'trades.csv'

################################################################################
# Main code #


@dataclasses.dataclass
class AutoSellConfig:
    interval_range: tuple[datetime.timedelta, datetime.timedelta]
    input_asset: fin_defs.Asset
    input_amount_range: tuple[Decimal, Decimal]
    output_asset: fin_defs.Asset
    exit_when_empty: bool = True


def sample_from_range(rng: random.Random, range: tuple[Any, Any]) -> Any:
    multiplier = rng.random()
    if isinstance(range[0], Decimal):
        multiplier = Decimal(multiplier)
    return range[0] + (range[1] - range[0]) * multiplier


SELLER = fin_depo.defi_kucoin.KucoinDepoFetcher(
    kucoin_secret=config.KUCOIN_SECRET,
    kucoin_key=config.KUCOIN_KEY,
    kucoin_pass=config.KUCOIN_PASS,
)


def determine_available_tokens(token: fin_defs.Asset) -> Decimal:
    return SELLER.get_depo().get_amount_of_asset(token)


def sell_tokens(
    input_asset: fin_defs.Asset, input_amount: Decimal, output_asset: fin_defs.Asset,
) -> fin_depo.data.TradeOrderDetails:
    # return SELLER.place_market_order(input_asset, input_amount, output_asset)
    return fin_depo.data.TradeOrderDetails(
        input_asset=input_asset,
        input_amount=input_amount,
        output_asset=output_asset,
        output_amount=input_amount,
        fee_asset=input_asset,
        fee_amount=input_amount,
        order_id=10001,
        raw_order_details={'TEST': 1, 'DATA': 2},
    )


def run_auto_sell(config: AutoSellConfig):
    rng = random.SystemRandom()

    while True:
        # Check that account has tokens.
        input_amount_available = determine_available_tokens(config.input_asset)
        logger.info('Currently own %s %s', input_amount_available, config.input_asset)

        if input_amount_available > 0:
            amount_to_sell = sample_from_range(rng, config.input_amount_range)
            amount_to_sell = min(input_amount_available, amount_to_sell)
            logger.info('Attempting to sell %s %s', amount_to_sell, config.input_asset)

            order_details = sell_tokens(
                config.input_asset, amount_to_sell, config.output_asset,
            )
            print(order_details)
            # TODO: Write order details to file.

            del amount_to_sell
        elif config.exit_when_empty:
            break

        # Time out
        time_to_sleep = sample_from_range(rng, config.interval_range)
        time_to_sleep_secs = time_to_sleep.total_seconds()
        logger.info('Sleeping %s (%d seconds)', time_to_sleep, time_to_sleep_secs)
        time.sleep(time_to_sleep_secs)

        del input_amount_available