"""S2-01: Mean Reversion oraria con filtro orario.
Idea: crypto ha bias di ritorno alla media nelle ore notturne (00-06 UTC)
e di momentum nelle ore diurne USA (14-20 UTC).
- Compra quando RSI < 30 in ore notturne
- Vendi quando RSI > 70 in ore notturne
- Hold max 4h, stop loss 1.5%
Timeframe: 1h. Ingresso quasi giornaliero.
"""
from __future__ import annotations
import sys
sys.path.insert(0, ".")

import numpy as np
import pandas as pd
from src.data.downloader import load_data

FEE = 0.001
INITIAL = 1000
LEVERAGE = 3


def rsi(close: np.ndarray, period: int = 14) -> np.ndarray:
    delta = np.diff(close)
    gain = np.where(delta > 0, delta, 0)
    loss = np.where(delta < 0, -delta, 0)
    result = np.full(len(close), 50.0)
    avg_gain = np.mean(gain[:period])
    avg_loss = np.mean(loss[:period])
    for i in range(period, len(delta)):
        avg_gain = (avg_gain * (period - 1) + gain[i]) / period
        avg_loss = (avg_loss * (period - 1) + loss[i]) / period
        if avg_loss == 0:
            result[i + 1] = 100
        else:
            rs = avg_gain / avg_loss
            result[i + 1] = 100 - 100 / (1 + rs)
    return result


def bollinger_pct(close: np.ndarray, window: int = 20) -> np.ndarray:
    result = np.full(len(close), 0.5)
    for i in range(window, len(close)):
        w = close[i - window : i]
        ma = np.mean(w)
        std = np.std(w)
        if std > 0:
            result[i] = (close[i] - (ma - 2 * std)) / (4 * std)
    return result


def run_mean_reversion(asset, tf="1h"):
    df = load_data(asset, tf)
    close = df["close"].values
    high = df["high"].values
    low = df["low"].values
    n = len(df)

    timestamps = pd.to_datetime(df["timestamp"], unit="ms", utc=True)
    hours = timestamps.dt.hour.values

    rsi_vals = rsi(close, 14)
    bb_pct = bollinger_pct(close, 20)

    split = int(n * 0.7)

    configs = [
        # (rsi_low, rsi_high, allowed_hours, hold_max, stop_pct, name)
        (25, 75, list(range(0, 7)), 4, 0.015, "night_0-6_rsi25"),
        (30, 70, list(range(0, 7)), 4, 0.015, "night_0-6_rsi30"),
        (25, 75, list(range(0, 10)), 6, 0.02, "extended_0-9"),
        (30, 70, list(range(20, 24)) + list(range(0, 6)), 4, 0.015, "late_night"),
        (20, 80, list(range(0, 24)), 4, 0.015, "all_hours_rsi20"),
        # Bollinger band mean reversion
    ]

    print(f"\n{'#'*60}")
    print(f"  {asset} {tf} — MEAN REVERSION")
    print(f"{'#'*60}")

    for rsi_low, rsi_high, allowed, hold_max, stop, name in configs:
        capital = float(INITIAL)
        correct = 0
        total = 0
        daily_trades = {}

        for i in range(max(split, 20), n - hold_max):
            hour = hours[i]
            if hour not in allowed:
                continue

            day = timestamps[i].strftime("%Y-%m-%d")
            if daily_trades.get(day, 0) >= 2:
                continue

            direction = None
            if rsi_vals[i] < rsi_low and bb_pct[i] < 0.2:
                direction = "long"
            elif rsi_vals[i] > rsi_high and bb_pct[i] > 0.8:
                direction = "short"

            if direction is None:
                continue

            entry = close[i]
            best_exit = i + 1
            for j in range(i + 1, min(i + hold_max + 1, n)):
                price = close[j]
                if direction == "long":
                    pnl_pct = (price - entry) / entry
                    if pnl_pct <= -stop:
                        best_exit = j
                        break
                    if pnl_pct >= stop * 1.5:
                        best_exit = j
                        break
                else:
                    pnl_pct = (entry - price) / entry
                    if pnl_pct <= -stop:
                        best_exit = j
                        break
                    if pnl_pct >= stop * 1.5:
                        best_exit = j
                        break
                best_exit = j

            exit_price = close[best_exit]
            if direction == "long":
                trade_ret = (exit_price - entry) / entry
            else:
                trade_ret = (entry - exit_price) / entry

            net = trade_ret * LEVERAGE - FEE * 2 * LEVERAGE
            capital += capital * 0.15 * net
            capital = max(capital, 0)

            is_correct = trade_ret > 0
            total += 1
            if is_correct:
                correct += 1
            daily_trades[day] = daily_trades.get(day, 0) + 1

        if total < 20:
            continue

        acc = correct / total * 100
        ret = (capital - INITIAL) / INITIAL * 100
        test_days = (n - split) / 24
        test_years = test_days / 365.25
        ann = ((capital / INITIAL) ** (1 / test_years) - 1) * 100 if test_years > 0 and capital > 0 else -100
        dpnl = (capital - INITIAL) / test_days if test_days > 0 else 0
        days_with_trades = len(daily_trades)
        trades_per_day = total / days_with_trades if days_with_trades > 0 else 0

        tag = "✅" if acc >= 60 and ann >= 30 else ""
        print(f"  {name:25s}: trades={total:5d} acc={acc:.1f}% ret={ret:+.1f}% ann={ann:+.1f}% dd_est ~{abs(min(0, ret/3)):.0f}% €/day={dpnl:.2f} days_active={days_with_trades} {tag}")


for asset in ["ETH", "BTC"]:
    run_mean_reversion(asset, "1h")
    run_mean_reversion(asset, "15m")