import json

import pandas as pd
import time
import queue
import threading

# Initialize the DataFrame
df_trades = pd.DataFrame(columns=['price', 'qty', 'timestamp'])
df_order_book = pd.DataFrame(columns=['bid_price', 'bid_qty', 'ask_price', 'ask_qty'])

previous_order_book = None
fill_probabilities = {}
order_disappearances = {}
order_executions = {}
last_trade = {'price': None, 'qty': None, 'side': None}
messages = queue.Queue()  # 创建一个线程安全队列

stop_event = threading.Event()


def on_message_trade(_ws, message):
    global df_trades, order_executions, last_trade
    json_message = json.loads(message)
    trade = {
        'price': float(json_message['p']),
        'qty': float(json_message['q']),
        'timestamp': pd.to_datetime(json_message['T'], unit='ms'),
        'side': 'buy' if json_message['m'] else 'sell'  # 'm' indicates是否买方是做市商
    }
    trade_df = pd.DataFrame([trade])
    if not trade_df.empty and not trade_df.isna().all().all():
        df_trades = pd.concat([df_trades, trade_df], ignore_index=True)

        # 记录每个价格的实际成交总量
        price = trade['price']
        last_trade = {'price': price, 'qty': trade['qty'], 'side': trade['side']}
        if price not in order_executions:
            order_executions[price] = 0
        order_executions[price] += trade['qty']
        calculate_fill_probabilities()


def on_message_depth(_ws, message):
    global df_order_book, order_disappearances, previous_order_book
    json_message = json.loads(message)
    bids = json_message['bids'][:10]  # Top 10 bids
    asks = json_message['asks'][:10]  # Top 10 asks
    order_book = {
        'bid_price': [float(bid[0]) for bid in bids],
        'bid_qty': [float(bid[1]) for bid in bids],
        'ask_price': [float(ask[0]) for ask in asks],
        'ask_qty': [float(ask[1]) for ask in asks]
    }
    df_order_book = pd.DataFrame([order_book])

    if previous_order_book is not None:
        # 计算订单消失量
        for level in range(10):
            bid_price = df_order_book['bid_price'].iloc[0][level]
            ask_price = df_order_book['ask_price'].iloc[0][level]
            bid_qty = df_order_book['bid_qty'].iloc[0][level]
            ask_qty = df_order_book['ask_qty'].iloc[0][level]

            prev_bid_qty = previous_order_book['bid_qty'].iloc[0][level]
            prev_ask_qty = previous_order_book['ask_qty'].iloc[0][level]

            # 计算bid订单消失量
            if bid_price not in order_disappearances:
                order_disappearances[bid_price] = 0
            if prev_bid_qty > bid_qty:
                order_disappearances[bid_price] += (prev_bid_qty - bid_qty)

            # 计算ask订单消失量
            if ask_price not in order_disappearances:
                order_disappearances[ask_price] = 0
            if prev_ask_qty > ask_qty:
                order_disappearances[ask_price] += (prev_ask_qty - ask_qty)

    previous_order_book = df_order_book
    calculate_fill_probabilities()


# 计算成交概率
def calculate_fill_probabilities():
    global order_executions, order_disappearances, fill_probabilities
    fill_probabilities = {}
    for price in order_disappearances:
        if price in order_executions:
            disappearances = order_disappearances[price]
            executions = order_executions[price]
            # 确保成交概率不大于1
            fill_probabilities[price] = min(executions / disappearances, 1) if disappearances > 0 else 0
        else:
            fill_probabilities[price] = 0


# 定期记录和保存成交概率
def log_and_save_fill_probabilities():
    global df_order_book, fill_probabilities

    while not stop_event.is_set():
        if fill_probabilities and not df_order_book.empty:
            asks = [[price, fill_probabilities[price]] for price in df_order_book['ask_price'].iloc[0] if
                    price in fill_probabilities]
            bids = [[price, fill_probabilities[price]] for price in df_order_book['bid_price'].iloc[0] if
                    price in fill_probabilities]
            last_price = last_trade['price']
            last_qty = last_trade['qty']
            side = last_trade['side']
            data = {
                "asks": asks,
                "bids": bids,
                "last_price": last_price,
                "last_qty": last_qty,
                "side": side,
                "time": int(time.time() * 1000)
            }
            messages.put(data)
            # logger.info("Market Snapshot:\n%s", json.dumps(data))
        stop_event.wait(0.1)