import pandas as pd
import numpy as np
from collections import deque
import logging
import time
import yaml

logger = logging.getLogger(__name__)

class DataEngine:
    def __init__(self):
        self.settings = yaml.safe_load(open("config/settings.yaml"))

        self.price_buffers = {}
        self.volume_buffers = {}

        self.candle_buffers = {}

        self.indicators_cache = {}

        self.max_price_buffer = 1000
        self.max_candle_buffer = 200

        pairs = yaml.safe_load(open("config/pairs.yaml"))["pairs"]
        for pair in pairs:
            self._init_buffers(pair)

    def _init_buffers(self, symbol):
        self.price_buffers[symbol] = deque(maxlen=self.max_price_buffer)
        self.volume_buffers[symbol] = deque(maxlen=self.max_price_buffer)

        intervals = ["1", "5", "15"]
        for interval in intervals:
            key = f"{symbol}_{interval}"
            self.candle_buffers[key] = deque(maxlen=self.max_candle_buffer)
            self.indicators_cache[key] = {}

    def update_price(self, symbol, price, volume=0):
        self.price_buffers[symbol].append(float(price))
        if volume > 0:
            self.volume_buffers[symbol].append(float(volume))

    def update_candle(self, symbol, interval, candle_data):
        key = f"{symbol}_{interval}"

        if isinstance(candle_data, dict):
            candle = {
                'timestamp': int(candle_data.get('timestamp', candle_data.get('start', time.time() * 1000))),
                'open': float(candle_data['open']),
                'high': float(candle_data['high']),
                'low': float(candle_data['low']),
                'close': float(candle_data['close']),
                'volume': float(candle_data.get('volume', 0))
            }
        elif isinstance(candle_data, list):

            candle = {
                'timestamp': int(candle_data[0]),
                'open': float(candle_data[1]),
                'high': float(candle_data[2]),
                'low': float(candle_data[3]),
                'close': float(candle_data[4]),
                'volume': float(candle_data[5])
            }
        else:
            logger.error(f"Invalid candle data format: {candle_data}")
            return

        self.candle_buffers[key].append(candle)

        self.update_price(symbol, candle['close'], candle['volume'])

        self.indicators_cache[key] = {}

    def get_prices(self, symbol, limit=100):
        return list(self.price_buffers.get(symbol, deque()))[-limit:]

    def get_candles(self, symbol, interval="1", limit=100):
        key = f"{symbol}_{interval}"
        candles = list(self.candle_buffers.get(key, deque()))[-limit:]

        if not candles:
            return pd.DataFrame()

        df = pd.DataFrame(candles)
        df['timestamp'] = pd.to_datetime(df['timestamp'], unit='ms')
        df.set_index('timestamp', inplace=True)

        return df

    def calculate_ema(self, symbol, interval="1", period=9):
        key = f"{symbol}_{interval}"
        cache_key = f"ema_{period}"

        if cache_key in self.indicators_cache[key]:
            return self.indicators_cache[key][cache_key]

        df = self.get_candles(symbol, interval, limit=period * 2)
        if df.empty or len(df) < period:
            return None

        ema = df['close'].ewm(span=period, adjust=False).mean()
        self.indicators_cache[key][cache_key] = ema.iloc[-1] if not ema.empty else None

        return ema.iloc[-1]

    def calculate_rsi(self, symbol, interval="1", period=14):
        key = f"{symbol}_{interval}"
        cache_key = f"rsi_{period}"

        if cache_key in self.indicators_cache[key]:
            return self.indicators_cache[key][cache_key]

        df = self.get_candles(symbol, interval, limit=period * 3)
        if df.empty or len(df) < period + 1:
            return None

        delta = df['close'].diff()
        gain = (delta.where(delta > 0, 0)).rolling(window=period).mean()
        loss = (-delta.where(delta < 0, 0)).rolling(window=period).mean()

        rs = gain / loss
        rsi = 100 - (100 / (1 + rs))

        self.indicators_cache[key][cache_key] = rsi.iloc[-1] if not rsi.empty else None

        return rsi.iloc[-1]

    def calculate_adx(self, symbol, interval="1", period=14):
        key = f"{symbol}_{interval}"
        cache_key = f"adx_{period}"

        if cache_key in self.indicators_cache[key]:
            return self.indicators_cache[key][cache_key]

        df = self.get_candles(symbol, interval, limit=period * 3)
        if df.empty or len(df) < period + 1:
            return None

        df['hl'] = df['high'] - df['low']
        df['hc'] = np.abs(df['high'] - df['close'].shift(1))
        df['lc'] = np.abs(df['low'] - df['close'].shift(1))
        df['tr'] = df[['hl', 'hc', 'lc']].max(axis=1)

        df['dm_plus'] = np.where((df['high'] - df['high'].shift(1)) > (df['low'].shift(1) - df['low']),
                                np.maximum(df['high'] - df['high'].shift(1), 0), 0)
        df['dm_minus'] = np.where((df['low'].shift(1) - df['low']) > (df['high'] - df['high'].shift(1)),
                                 np.maximum(df['low'].shift(1) - df['low'], 0), 0)

        df['di_plus'] = 100 * (df['dm_plus'].rolling(window=period).mean() / df['tr'].rolling(window=period).mean())
        df['di_minus'] = 100 * (df['dm_minus'].rolling(window=period).mean() / df['tr'].rolling(window=period).mean())

        df['dx'] = 100 * np.abs(df['di_plus'] - df['di_minus']) / (df['di_plus'] + df['di_minus'])
        adx = df['dx'].rolling(window=period).mean()

        self.indicators_cache[key][cache_key] = adx.iloc[-1] if not adx.empty else None

        return adx.iloc[-1]

    def get_orderbook_imbalance(self, symbol, orderbook_data=None):
        if orderbook_data is None:

            return 0.0

        bids = orderbook_data.get('b', [])
        asks = orderbook_data.get('a', [])

        bid_volume = sum(float(bid[1]) for bid in bids[:10])
        ask_volume = sum(float(ask[1]) for ask in asks[:10])

        total_volume = bid_volume + ask_volume
        if total_volume == 0:
            return 0.0

        imbalance = (bid_volume - ask_volume) / total_volume

        return imbalance

    def get_spread(self, symbol, orderbook_data=None):
        if orderbook_data is None:
            return 0.0

        bids = orderbook_data.get('b', [])
        asks = orderbook_data.get('a', [])

        if not bids or not asks:
            return 0.0

        best_bid = float(bids[0][0])
        best_ask = float(asks[0][0])

        spread = (best_ask - best_bid) / best_bid
        return spread

    def detect_volume_spike(self, symbol, interval="1", threshold=2.0):
        df = self.get_candles(symbol, interval, limit=20)
        if df.empty or len(df) < 5:
            return False

        current_volume = df['volume'].iloc[-1]
        avg_volume = df['volume'].iloc[:-1].mean()

        if avg_volume == 0:
            return False

        return (current_volume / avg_volume) > threshold

    def get_price_change_rate(self, symbol, periods=5):
        prices = self.get_prices(symbol, limit=periods + 1)
        if len(prices) < periods + 1:
            return 0.0

        old_price = prices[0]
        new_price = prices[-1]

        if old_price == 0:
            return 0.0

        return (new_price - old_price) / old_price

    def clear_cache(self, symbol=None, interval=None):
        if symbol and interval:
            key = f"{symbol}_{interval}"
            if key in self.indicators_cache:
                self.indicators_cache[key] = {}
        elif symbol:

            for key in list(self.indicators_cache.keys()):
                if key.startswith(f"{symbol}_"):
                    self.indicators_cache[key] = {}
        else:

            self.indicators_cache = {}

    def get_buffer_status(self):
        status = {
            'price_buffers': {symbol: len(buffer) for symbol, buffer in self.price_buffers.items()},
            'candle_buffers': {key: len(buffer) for key, buffer in self.candle_buffers.items()},
            'indicators_cache': {key: list(cache.keys()) for key, cache in self.indicators_cache.items()}
        }
        return status