"""Persistent trade history logger — appends every trade to a CSV file."""

import csv
import os
from datetime import datetime, timezone, timedelta

_TZ_UTC8 = timezone(timedelta(hours=8))

import config

TRADE_LOG_FILE = "trade_history.csv"
FIELDS = [
    "timestamp", "datetime", "symbol", "name", "action", "amount",
    "price", "amount_usdt", "confidence", "reason", "mode", "status",
]


def _ensure_header():
    if not os.path.exists(TRADE_LOG_FILE):
        with open(TRADE_LOG_FILE, "w", newline="") as f:
            writer = csv.DictWriter(f, fieldnames=FIELDS)
            writer.writeheader()


def log_trade(trade: dict):
    """Append a trade record to the CSV log."""
    _ensure_header()
    sym = trade.get("symbol", "")
    row = {
        "timestamp": trade.get("timestamp", ""),
        "datetime": datetime.now(_TZ_UTC8).isoformat(timespec="seconds"),
        "symbol": sym,
        "name": config.SYMBOL_NAMES.get(sym, sym),
        "action": trade.get("action", ""),
        "amount": trade.get("amount", 0),
        "price": trade.get("price", 0),
        "amount_usdt": trade.get("amount_usdt", 0),
        "confidence": trade.get("confidence", 0),
        "reason": trade.get("reason", ""),
        "mode": trade.get("mode", ""),
        "status": trade.get("status", ""),
    }
    with open(TRADE_LOG_FILE, "a", newline="") as f:
        writer = csv.DictWriter(f, fieldnames=FIELDS)
        writer.writerow(row)