"""
Build training rows from external minute bars.

This generates synthetic candidate rows from minute bars, not actual bot trades.
Rows are useful for pretraining movement/holding-period models.
"""
import argparse
import csv
from collections import defaultdict
from pathlib import Path


ROOT = Path(__file__).resolve().parent.parent
MINUTE_ROOT = ROOT / "data" / "external" / "minute"
DAILY_ROOT = ROOT / "data" / "external" / "daily"
DEFAULT_OUT = ROOT / "data" / "external_training_dataset.csv"


CHECKPOINTS = (1, 3, 5, 10)


def _read_csv(path: Path) -> list[dict]:
    with path.open("r", encoding="utf-8-sig", newline="") as f:
        return list(csv.DictReader(f))


def _num(value, default=0.0):
    try:
        return float(str(value).replace(",", ""))
    except (TypeError, ValueError):
        return default


def _load_daily_amounts() -> dict[str, list[dict]]:
    by_ticker = defaultdict(dict)
    for file in DAILY_ROOT.glob("*/stocks.csv"):
        rows = _read_csv(file)
        for row in rows:
            date = str(row.get("date") or file.parent.name)
            ticker = str(row.get("ticker") or row.get("티커") or "")
            if ticker:
                row["date"] = date
                by_ticker[ticker][date] = row
    return {
        ticker: [rows[date] for date in sorted(rows)]
        for ticker, rows in by_ticker.items()
    }


def _previous_daily_row(daily: dict[str, list[dict]], date: str, ticker: str) -> dict:
    previous = {}
    for row in daily.get(ticker, []):
        if str(row.get("date", "")) >= date:
            break
        previous = row
    return previous


def _future_metrics(rows: list[dict], idx: int, entry_price: float):
    metrics = {}
    highs = []
    lows = []
    for minutes in CHECKPOINTS:
        j = idx + minutes
        if j >= len(rows):
            metrics[f"price_{minutes}m"] = ""
            metrics[f"ret_{minutes}m"] = ""
            metrics[f"mfe_{minutes}m"] = ""
            metrics[f"mae_{minutes}m"] = ""
            continue
        window = rows[idx + 1:j + 1]
        highs.extend(_num(r["high"]) for r in window)
        lows.extend(_num(r["low"]) for r in window)
        close = _num(rows[j]["close"])
        high = max(highs) if highs else entry_price
        low = min(lows) if lows else entry_price
        metrics[f"price_{minutes}m"] = close
        metrics[f"ret_{minutes}m"] = (close - entry_price) / entry_price * 100 if entry_price else 0
        metrics[f"mfe_{minutes}m"] = (high - entry_price) / entry_price * 100 if entry_price else 0
        metrics[f"mae_{minutes}m"] = (low - entry_price) / entry_price * 100 if entry_price else 0
    return metrics


def _rows_for_file(path: Path, daily: dict, k: float, breakout_only: bool):
    rows = _read_csv(path)
    rows = [r for r in rows if r.get("time") and _num(r.get("close")) > 0]
    rows.sort(key=lambda r: (r.get("date", ""), r.get("time", "")))
    if len(rows) < 20:
        return []

    by_date = defaultdict(list)
    for row in rows:
        by_date[row["date"]].append(row)

    out = []
    prev_by_date = {}
    for date in sorted(by_date):
        day_rows = by_date[date]
        ticker = day_rows[0]["ticker"]
        daily_row = _previous_daily_row(daily, date, ticker)
        prev_high = _num(daily_row.get("high"))
        prev_low = _num(daily_row.get("low"))
        prev_amount = _num(daily_row.get("amount"))

        if not prev_high or not prev_low:
            prev = prev_by_date.get(ticker)
            if prev:
                prev_high = prev["high"]
                prev_low = prev["low"]
                prev_amount = prev["amount"]

        today_open = _num(day_rows[0]["open"]) or _num(day_rows[0]["close"])
        target = today_open + (prev_high - prev_low) * k if prev_high and prev_low else 0
        crossed = False

        for idx, row in enumerate(day_rows[:-max(CHECKPOINTS)]):
            tm = row["time"][:4]
            if tm < "0905" or tm >= "1400":
                continue
            close = _num(row["close"])
            if breakout_only:
                if not target or close < target or crossed:
                    continue
                crossed = True

            metrics = _future_metrics(day_rows, idx, close)
            label_win = 1 if _num(metrics.get("ret_10m")) > 0 else 0
            label_stop_loss = 1 if _num(metrics.get("mae_10m")) <= -2.0 else 0
            out.append({
                "source": "external_minute",
                "date": date,
                "ticker": ticker,
                "entry_time": row["time"],
                "current_price": close,
                "entry_price": close,
                "target_price": target,
                "today_open": today_open,
                "prev_high": prev_high,
                "prev_low": prev_low,
                "prev_amount": prev_amount,
                "volume": row.get("volume", ""),
                **metrics,
                "label_win": label_win,
                "label_stop_loss": label_stop_loss,
            })

        prev_by_date[ticker] = {
            "high": max(_num(r["high"]) for r in day_rows),
            "low": min(_num(r["low"]) for r in day_rows),
            "amount": sum(_num(r["close"]) * _num(r["volume"]) for r in day_rows),
        }
    return out


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--minute-root", default=str(MINUTE_ROOT))
    parser.add_argument("--out", default=str(DEFAULT_OUT))
    parser.add_argument("--k", type=float, default=0.5)
    parser.add_argument("--all-minutes", action="store_true", help="Use every eligible minute, not only first breakout.")
    args = parser.parse_args()

    daily = _load_daily_amounts()
    all_rows = []
    for path in Path(args.minute_root).glob("*/*.csv"):
        all_rows.extend(_rows_for_file(path, daily, args.k, breakout_only=not args.all_minutes))

    out_path = Path(args.out)
    if not out_path.is_absolute():
        out_path = ROOT / out_path
    out_path.parent.mkdir(parents=True, exist_ok=True)

    fieldnames = sorted({key for row in all_rows for key in row.keys()})
    with out_path.open("w", encoding="utf-8-sig", newline="") as f:
        writer = csv.DictWriter(f, fieldnames=fieldnames)
        writer.writeheader()
        writer.writerows(all_rows)

    print(f"external dataset rows={len(all_rows)} -> {out_path}")


if __name__ == "__main__":
    main()