"""
技术指标库

提供常用的趋势、动量、波动率和成交量指标计算。
所有函数均为纯 Python 实现，无外部依赖。

用法:
    from engine.indicators import sma, ema, macd, rsi, bollinger, atr

    closes = [100.0, 101.0, 102.0, ...]
    ma = sma(closes, period=20)
    rsi_vals = rsi(closes, period=14)
    upper, mid, lower = bollinger(closes, period=20, std=2)
"""

from .trend import sma, ema, macd, macd_signal, macd_histogram, adx
from .momentum import rsi, stoch, stoch_k, stoch_d
from .volatility import bollinger, bollinger_upper, bollinger_mid, bollinger_lower, atr
from .volume import obv, vwap

__all__ = [
    # 趋势
    "sma", "ema", "macd", "macd_signal", "macd_histogram", "adx",
    # 动量
    "rsi", "stoch", "stoch_k", "stoch_d",
    # 波动率
    "bollinger", "bollinger_upper", "bollinger_mid", "bollinger_lower", "atr",
    # 成交量
    "obv", "vwap",
]