"""
API-ready versions of technical indicators
Streamlit bağımlılıkları olmayan versiyonlar
"""
import pandas as pd
import numpy as np

def calculate_rsi(data, window=14):
    """RSI hesapla"""
    delta = data.diff()
    up = delta.clip(lower=0)
    down = -1 * delta.clip(upper=0)
    ema_up = up.ewm(com=window-1, adjust=False).mean()
    ema_down = down.ewm(com=window-1, adjust=False).mean()
    rs = ema_up / ema_down
    return 100 - (100 / (1 + rs))

def calculate_macd(data):
    """MACD hesapla"""
    exp1 = data.ewm(span=12, adjust=False).mean()
    exp2 = data.ewm(span=26, adjust=False).mean()
    macd = exp1 - exp2
    signal = macd.ewm(span=9, adjust=False).mean()
    histogram = macd - signal
    return macd, signal, histogram

def calculate_bollinger_bands(data, window=20, num_std=2):
    """Bollinger Bands hesapla"""
    sma = data.rolling(window=window).mean()
    std = data.rolling(window=window).std()
    upper = sma + (std * num_std)
    lower = sma - (std * num_std)
    return upper, sma, lower

def calculate_all_indicators_for_api(df):
    """
    Tüm teknik göstergeleri hesapla ve JSON-friendly formatta döndür
    """
    try:
        close = df['Close']
        
        # RSI
        rsi = calculate_rsi(close)
        
        # MACD
        macd, signal, histogram = calculate_macd(close)
        
        # Bollinger Bands
        bb_upper, bb_middle, bb_lower = calculate_bollinger_bands(close)
        
        # Moving Averages
        sma_20 = close.rolling(window=20).mean()
        sma_50 = close.rolling(window=50).mean()
        sma_200 = close.rolling(window=200).mean()
        ema_12 = close.ewm(span=12, adjust=False).mean()
        ema_26 = close.ewm(span=26, adjust=False).mean()
        
        # Son değerleri al
        latest = {
            'rsi': {
                'value': float(rsi.iloc[-1]) if not rsi.empty else None,
                'signal': 'OVERBOUGHT' if rsi.iloc[-1] > 70 else 'OVERSOLD' if rsi.iloc[-1] < 30 else 'NEUTRAL'
            },
            'macd': {
                'macd': float(macd.iloc[-1]) if not macd.empty else None,
                'signal': float(signal.iloc[-1]) if not signal.empty else None,
                'histogram': float(histogram.iloc[-1]) if not histogram.empty else None,
                'trend': 'BULLISH' if histogram.iloc[-1] > 0 else 'BEARISH'
            },
            'bollinger': {
                'upper': float(bb_upper.iloc[-1]) if not bb_upper.empty else None,
                'middle': float(bb_middle.iloc[-1]) if not bb_middle.empty else None,
                'lower': float(bb_lower.iloc[-1]) if not bb_lower.empty else None,
                'position': 'ABOVE' if close.iloc[-1] > bb_upper.iloc[-1] else 'BELOW' if close.iloc[-1] < bb_lower.iloc[-1] else 'MIDDLE'
            },
            'moving_averages': {
                'sma_20': float(sma_20.iloc[-1]) if not sma_20.empty else None,
                'sma_50': float(sma_50.iloc[-1]) if not sma_50.empty else None,
                'sma_200': float(sma_200.iloc[-1]) if not sma_200.empty else None,
                'ema_12': float(ema_12.iloc[-1]) if not ema_12.empty else None,
                'ema_26': float(ema_26.iloc[-1]) if not ema_26.empty else None,
            },
            'price': {
                'current': float(close.iloc[-1]),
                'change_pct': float(((close.iloc[-1] - close.iloc[-2]) / close.iloc[-2] * 100)) if len(close) > 1 else 0
            }
        }
        
        return latest
        
    except Exception as e:
        print(f"Indicators hesaplama hatası: {e}")
        return None