import pandas as pd
import numpy as np
import yfinance as yf
import os
import finnhub
from twelvedata import TDClient
try:
    import talib as ta
except ImportError:
    ta = None
from datetime import datetime, timedelta
from newsapi import NewsApiClient
from vaderSentiment.vaderSentiment import SentimentIntensityAnalyzer
from sklearn.preprocessing import MinMaxScaler
from alpha_vantage.timeseries import TimeSeries
import time
import logging
import requests

# Configure logging
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')

def print_log(message, level='INFO'):
    if level == 'INFO':
        logging.info(message)
    elif level == 'WARNING':
        logging.warning(message)
    elif level == 'ERROR':
        logging.error(message)
    else:
        logging.debug(message)

analyzer = SentimentIntensityAnalyzer()

def load_data_finnhub(ticker, start, end, interval, api_key):
    print_log(f"Fetching data for {ticker} from Finnhub")
    try:
        if not api_key:
            raise ValueError("Finnhub API key is required.")
        finnhub_client = finnhub.Client(api_key=api_key)
        start_ts = int(time.mktime(pd.to_datetime(start).timetuple()))
        end_ts = int(time.mktime(pd.to_datetime(end).timetuple()))
        
        # Finnhub interval mapping
        finnhub_interval_map = {
            "1m": "1", "5m": "5", "15m": "15", "30m": "30", "60m": "60",
            "1h": "60", "1d": "D", "1wk": "W", "1mo": "M"
        }
        fh_interval = finnhub_interval_map.get(interval, "D")
        
        res = finnhub_client.stock_candles(ticker, fh_interval, start_ts, end_ts)
        if res['s'] == 'no_data':
            raise ValueError(f"No data for {ticker} from Finnhub")
        df = pd.DataFrame(res)
        df['Date'] = pd.to_datetime(df['t'], unit='s')
        df = df.rename(columns={'o': 'Open', 'h': 'High', 'l': 'Low', 'c': 'value', 'v': 'Volume'})
        df = df.set_index('Date')
        df = df[['Open', 'High', 'Low', 'value', 'Volume']]
        return df
    except Exception as e:
        print_log(f"Error in load_data_finnhub for {ticker}: {str(e)}", 'ERROR')
        raise ValueError(f"Failed to load data for {ticker} from Finnhub: {str(e)}")

def load_data_twelvedata(ticker, start, end, interval, api_key):
    print_log(f"Fetching data for {ticker} from Twelve Data")
    try:
        if not api_key:
            raise ValueError("Twelve Data API key is required.")
        td = TDClient(apikey=api_key)
        
        # Twelve Data interval mapping
        twelvedata_interval_map = {
            "1m": "1min", "5m": "5min", "15m": "15min", "30m": "30min", "60m": "1h",
            "1h": "1h", "1d": "1day", "1wk": "1week", "1mo": "1month"
        }
        td_interval = twelvedata_interval_map.get(interval, "1day")

        ts = td.time_series(symbol=ticker, interval=td_interval, start_date=start, end_date=end, outputsize=5000)
        df = ts.as_pandas()
        if df is None or df.empty:
            raise ValueError(f"No data for {ticker} from Twelve Data")
        df = df.rename(columns={'close': 'value', 'open': 'Open', 'high': 'High', 'low': 'Low', 'volume': 'Volume'})
        df.index.name = 'Date'
        return df
    except Exception as e:
        print_log(f"Error in load_data_twelvedata for {ticker}: {str(e)}", 'ERROR')
        raise ValueError(f"Failed to load data for {ticker} from Twelve Data: {str(e)}")

def load_data(data_src='yahoo', ticker='AAPL', start='2020-01-01', end='2023-01-01', interval='1d', file_upload=None, alpha_api_key=None, finnhub_api_key=None, twelvedata_api_key=None):
    print_log(f"Loading data: source={data_src}, ticker={ticker}, start={start}, end={end}, interval={interval}, file_upload={'set' if file_upload else 'unset'}, alpha_api_key={'set' if alpha_api_key else 'unset'}, finnhub_api_key={'set' if finnhub_api_key else 'unset'}, twelvedata_api_key={'set' if twelvedata_api_key else 'unset'}")

    start_date = pd.to_datetime(start)
    end_date = pd.to_datetime(end)
    if start_date >= end_date:
        raise ValueError(f"Start date {start} must be before end date {end}")
    if end_date > datetime.now():
        print_log(f"End date {end} is in the future. Using current date as end date.", 'WARNING')
        end_date = datetime.now()

    df = pd.DataFrame()

    if data_src == 'csv' and file_upload:
        try:
            file_path = getattr(file_upload, 'name', file_upload)
            print_log(f"Loading CSV from {file_path}")
            df = pd.read_csv(file_path)
            if 'Date' not in df.columns:
                raise ValueError("CSV must contain a 'Date' column")
            df['Date'] = pd.to_datetime(df['Date']).dt.tz_localize(None)
            df = df.set_index('Date')
            if 'Close' not in df.columns and 'value' not in df.columns:
                raise ValueError("CSV must contain 'Close' or 'value' column")
            if 'Close' in df.columns:
                df = df.rename(columns={'Close': 'value'})
            if df.empty:
                raise ValueError(f"CSV data is empty for {ticker}")
            if df['value'].isna().all():
                raise ValueError(f"CSV 'value' column contains only NaNs for {ticker}")
        except Exception as e:
            print_log(f"Failed to load CSV {file_path}: {str(e)}", 'ERROR')
            raise ValueError(f"Failed to load CSV: {str(e)}")
    elif data_src == 'yahoo':
        print_log(f"Fetching data for {ticker} from Yahoo Finance")
        try:
            # Adjust start_date for yfinance intraday limitations
            if interval in ["1m"]:
                max_days = 7
            elif interval in ["2m", "5m", "15m", "30m", "60m", "90m", "1h"]:
                max_days = 60
            else:
                max_days = None

            if max_days:
                adjusted_end_date = end_date + timedelta(days=1) # yfinance end date is exclusive
                adjusted_start_date = adjusted_end_date - timedelta(days=max_days)
                if start_date < adjusted_start_date:
                    print_log(f"Adjusting start date for {interval} interval from {start_date.strftime('%Y-%m-%d')} to {adjusted_start_date.strftime('%Y-%m-%d')} due to yfinance limitations.", 'WARNING')
                    start_date = adjusted_start_date

            df = yf.download(ticker, start=start_date, end=end_date, interval=interval, progress=False, auto_adjust=False)

            if isinstance(df.columns, pd.MultiIndex):
                df.columns = df.columns.droplevel(1)
            if df.empty:
                raise ValueError(f"No data returned from Yahoo Finance for {ticker}")
            if 'Close' not in df.columns:
                raise ValueError(f"Yahoo Finance data missing 'Close' column for {ticker}")
            df = df.rename(columns={'Close': 'value'})
            # The index is already datetime, no need to create a 'Date' column and then reset
            if df['value'].isna().all():
                raise ValueError(f"Yahoo Finance 'value' column contains only NaNs for {ticker}")
            if df['value'].empty:
                raise ValueError(f"Yahoo Finance 'value' column is empty for {ticker}")
        except Exception as e:
            print_log(f"Yahoo Finance failed for {ticker}: {str(e)}", 'ERROR')
            raise ValueError(f"Yahoo Finance failed for {ticker}: {str(e)}")
    elif data_src == 'alpha_vantage' and alpha_api_key:
        print_log(f"Attempting Alpha Vantage for {ticker}, interval {interval}")
        try:
            ts = TimeSeries(key=alpha_api_key, output_format='pandas')
            # Alpha Vantage interval mapping
            av_interval_map = {
                "1m": "1min", "5m": "5min", "15m": "15min", "30m": "30min", "60m": "60min",
                "1h": "60min"
            }
            av_interval = av_interval_map.get(interval)
            
            if av_interval:
                df_av, _ = ts.get_intraday(symbol=ticker, interval=av_interval, outputsize='full')
            elif interval == "1d":
                df_av, _ = ts.get_daily(symbol=ticker, outputsize='full')
            elif interval == "1wk":
                df_av, _ = ts.get_weekly(symbol=ticker)
            elif interval == "1mo":
                df_av, _ = ts.get_monthly(symbol=ticker)
            else:
                raise ValueError(f"Unsupported interval for Alpha Vantage: {interval}")

            if df_av.empty:
                raise ValueError(f"No data returned from Alpha Vantage for {ticker}")
            
            # Standardize column names
            df_av = df_av.rename(columns={
                '4. close': 'value', '1. open': 'Open', '2. high': 'High', 
                '3. low': 'Low', '5. volume': 'Volume'
            })
            # For daily/weekly/monthly, index is already datetime. For intraday, it's also datetime.
            # Ensure consistent column order and index type
            df = df_av[['Open', 'High', 'Low', 'value', 'Volume']]
            df.index = pd.to_datetime(df.index)
            df = df.sort_index()
            
            if df['value'].isna().all():
                raise ValueError(f"Alpha Vantage 'value' column contains only NaNs for {ticker}")
            if df['value'].empty:
                raise ValueError(f"Alpha Vantage 'value' column is empty for {ticker}")
            print_log(f"Data loaded for {ticker} from Alpha Vantage with date range: {df.index.min()} to {df.index.max()}, shape: {df.shape}")

        except Exception as e:
            print_log(f"Alpha Vantage failed for {ticker}: {str(e)}", 'ERROR')
            raise ValueError(f"Alpha Vantage failed for {ticker}: {str(e)}")
    elif data_src == 'finnhub' and finnhub_api_key:
        df = load_data_finnhub(ticker, start, end, interval, finnhub_api_key)
    elif data_src == 'twelvedata' and twelvedata_api_key:
        df = load_data_twelvedata(ticker, start, end, interval, twelvedata_api_key)

    if df.empty:
        raise ValueError(f"No data loaded for {ticker} from {data_src}")

    # Ensure index is DatetimeIndex and sorted
    if not isinstance(df.index, pd.DatetimeIndex):
        df.index = pd.to_datetime(df.index)
    df = df.sort_index()

    required_cols = ['Open', 'High', 'Low', 'value', 'Volume']
    for col in required_cols:
        if col not in df.columns:
            df[col] = np.nan

    if 'value' not in df.columns:
        raise ValueError(f"Target column 'value' is missing for {ticker}")
    if df['value'].isna().all():
        raise ValueError(f"Target column 'value' contains only NaNs for {ticker}")
    if df['value'].empty:
        raise ValueError(f"Target column 'value' is empty for {ticker}")

    print_log(f"Data loaded for {ticker} with date range: {df.index.min()} to {df.index.max()}, shape: {df.shape}")
    return df

def add_technical_indicators(df, selected_indicators):
    try:
        print_log(f"Starting add_technical_indicators with indicators: {selected_indicators}")
        if df.empty:
            print_log("DataFrame is empty, skipping technical indicator calculation.", "WARNING")
            return df, []

        for col in ['Open', 'High', 'Low', 'value', 'Volume']:
            if col not in df.columns:
                df[col] = np.nan
            df[col] = pd.to_numeric(df[col], errors='coerce')

        df.dropna(subset=['Open', 'High', 'Low', 'value', 'Volume'], inplace=True)
        if df.empty:
            print_log("DataFrame is empty after dropping NaNs for technical indicators.", "WARNING")
            return df, []

        if ta is None:
            print_log("TA-Lib not available. Cannot compute indicators. Falling back to 'value'.", 'ERROR')
            return df, []

        close = df['value'].values
        high = df['High'].values
        low = df['Low'].values
        volume = df['Volume'].values
        open_ = df['Open'].values

        indicator_map = {
            'rsi': {'func': ta.RSI, 'inputs': ['close'], 'params': {'timeperiod': 14}, 'output': ['rsi_14']},
            'macd': {'func': ta.MACD, 'inputs': ['close'], 'params': {'fastperiod': 12, 'slowperiod': 26, 'signalperiod': 9}, 'output': ['macd_12_26_9', 'macds_12_26_9', 'macdhist_12_26_9']},
            'bbands': {'func': ta.BBANDS, 'inputs': ['close'], 'params': {'timeperiod': 20}, 'output': ['upperband_20', 'middleband_20', 'lowerband_20']},
            'stoch': {'func': ta.STOCH, 'inputs': ['high', 'low', 'close'], 'params': {'fastk_period': 14, 'slowk_period': 3, 'slowd_period': 3}, 'output': ['slowk_14_3_3', 'slowd_14_3_3']},
            'adx': {'func': ta.ADX, 'inputs': ['high', 'low', 'close'], 'params': {'timeperiod': 14}, 'output': ['adx_14']},
            'atr': {'func': ta.ATR, 'inputs': ['high', 'low', 'close'], 'params': {'timeperiod': 14}, 'output': ['atr_14']},
            'cci': {'func': ta.CCI, 'inputs': ['high', 'low', 'close'], 'params': {'timeperiod': 14}, 'output': ['cci_14']},
            'ema': {'func': ta.EMA, 'inputs': ['close'], 'params': {'timeperiod': 14}, 'output': ['ema_14']},
            'sma': {'func': ta.SMA, 'inputs': ['close'], 'params': {'timeperiod': 14}, 'output': ['sma_14']},
            'mom': {'func': ta.MOM, 'inputs': ['close'], 'params': {'timeperiod': 10}, 'output': ['mom_10']},
            'roc': {'func': ta.ROC, 'inputs': ['close'], 'params': {'timeperiod': 10}, 'output': ['roc_10']},
            'willr': {'func': ta.WILLR, 'inputs': ['high', 'low', 'close'], 'params': {'timeperiod': 14}, 'output': ['willr_14']},
            'ultosc': {'func': ta.ULTOSC, 'inputs': ['high', 'low', 'close'], 'params': {'timeperiod1': 7, 'timeperiod2': 14, 'timeperiod3': 28}, 'output': ['ultosc_7_14_28']},
            'dx': {'func': ta.DX, 'inputs': ['high', 'low', 'close'], 'params': {'timeperiod': 14}, 'output': ['dx_14']},
            'minus_di': {'func': ta.MINUS_DI, 'inputs': ['high', 'low', 'close'], 'params': {'timeperiod': 14}, 'output': ['minus_di_14']},
            'plus_di': {'func': ta.PLUS_DI, 'inputs': ['high', 'low', 'close'], 'params': {'timeperiod': 14}, 'output': ['plus_di_14']},
            'mfi': {'func': ta.MFI, 'inputs': ['high', 'low', 'close', 'volume'], 'params': {'timeperiod': 14}, 'output': ['mfi_14']},
            'obv': {'func': ta.OBV, 'inputs': ['close', 'volume'], 'params': {}, 'output': ['obv']},
            'ad': {'func': ta.AD, 'inputs': ['high', 'low', 'close', 'volume'], 'params': {}, 'output': ['ad']},
            'adosc': {'func': ta.ADOSC, 'inputs': ['high', 'low', 'close', 'volume'], 'params': {'fastperiod': 3, 'slowperiod': 10}, 'output': ['adosc_3_10']},
            'aroon': {'func': ta.AROON, 'inputs': ['high', 'low'], 'params': {'timeperiod': 14}, 'output': ['aroon_down_14', 'aroon_up_14']},
            'aroonosc': {'func': ta.AROONOSC, 'inputs': ['high', 'low'], 'params': {'timeperiod': 14}, 'output': ['aroonosc_14']},
            'bop': {'func': ta.BOP, 'inputs': ['open_', 'high', 'low', 'close'], 'params': {}, 'output': ['bop']},
            'cmo': {'func': ta.CMO, 'inputs': ['close'], 'params': {'timeperiod': 14}, 'output': ['cmo_14']},
            'dema': {'func': ta.DEMA, 'inputs': ['close'], 'params': {'timeperiod': 30}, 'output': ['dema_30']},
            'kama': {'func': ta.KAMA, 'inputs': ['close'], 'params': {'timeperiod': 30}, 'output': ['kama_30']},
            'ppo': {'func': ta.PPO, 'inputs': ['close'], 'params': {'fastperiod': 12, 'slowperiod': 26, 'matype': 0}, 'output': ['ppo_12_26_0']},
            'rocp': {'func': ta.ROCP, 'inputs': ['close'], 'params': {'timeperiod': 10}, 'output': ['rocp_10']},
            'rocr': {'func': ta.ROCR, 'inputs': ['close'], 'params': {'timeperiod': 10}, 'output': ['rocr_10']},
            'rocr100': {'func': ta.ROCR100, 'inputs': ['close'], 'params': {'timeperiod': 10}, 'output': ['rocr100_10']},
            'trix': {'func': ta.TRIX, 'inputs': ['close'], 'params': {'timeperiod': 14}, 'output': ['trix_14']},
            # 'tsi': {'func': ta.TSI, 'inputs': ['close'], 'params': {'fastperiod': 13, 'slowperiod': 25}, 'output': ['tsi_13_25']}, # Removed due to TA-Lib attribute error
            'uo': {'func': ta.ULTOSC, 'inputs': ['high', 'low', 'close'], 'params': {'timeperiod1': 7, 'timeperiod2': 14, 'timeperiod3': 28}, 'output': ['ultosc_7_14_28']},
            'willr': {'func': ta.WILLR, 'inputs': ['high', 'low', 'close'], 'params': {'timeperiod': 14}, 'output': ['willr_14']},
            'wma': {'func': ta.WMA, 'inputs': ['close'], 'params': {'timeperiod': 30}, 'output': ['wma_30']},
        }

        added_features = []
        for indicator_name in selected_indicators:
            if indicator_name in indicator_map:
                indicator_info = indicator_map[indicator_name]
                func = indicator_info['func']
                inputs = []
                for input_name in indicator_info['inputs']:
                    if input_name == 'close':
                        inputs.append(close)
                    elif input_name == 'high':
                        inputs.append(high)
                    elif input_name == 'low':
                        inputs.append(low)
                    elif input_name == 'volume':
                        inputs.append(volume)
                    elif input_name == 'open_':
                        inputs.append(open_)

                # Ensure inputs are numpy arrays and not empty
                if not all(len(arr) > 0 for arr in inputs):
                    print_log(f"Skipping {indicator_name}: insufficient data for inputs.", "WARNING")
                    continue

                try:
                    output_values = func(*inputs, **indicator_info['params'])
                    if not isinstance(output_values, tuple):
                        output_values = (output_values,)

                    for i, col_name in enumerate(indicator_info['output']):
                        df[col_name] = np.nan
                        # Ensure the output array matches the DataFrame length
                        if len(output_values[i]) == len(df):
                            df[col_name] = output_values[i]
                        else:
                            # Align output to DataFrame by padding with NaNs at the beginning
                            nan_padding = np.full(len(df) - len(output_values[i]), np.nan)
                            df[col_name] = np.concatenate((nan_padding, output_values[i]))
                        added_features.append(col_name)
                except Exception as e:
                    print_log(f"Error calculating indicator {indicator_name}: {str(e)}", "ERROR")
            else:
                print_log(f"Unknown indicator: {indicator_name}", "WARNING")

        df.dropna(inplace=True)
        print_log(f"Finished add_technical_indicators. New features added: {added_features}")
        return df, added_features
    except Exception as e:
        print_log(f"Error in add_technical_indicators: {str(e)}", 'ERROR')
        return df, []

def add_sentiment(df, ticker, news_api_key, start_date, end_date):
    try:
        sentiment_text, sentiment_score = sentiment_analysis(ticker, start_date, end_date, news_api_key)
        df['sentiment'] = sentiment_score if sentiment_score is not None else 0.0
        return df, sentiment_text
    except Exception as e:
        print_log(f"Error adding sentiment: {str(e)}", 'ERROR')
        df['sentiment'] = 0.0 # Default to neutral sentiment on error
        return df, f"Error adding sentiment: {str(e)}"


def sentiment_analysis(ticker, start_date, end_date, api_key):
    try:
        if not api_key:
            print_log("News API key not provided for sentiment analysis.", 'WARNING')
            return "No API key provided", None
        newsapi = NewsApiClient(api_key=api_key)
        start = pd.to_datetime(start_date)
        end = pd.to_datetime(end_date)
        articles = newsapi.get_everything(
            q=ticker, from_param=start.strftime("%Y-%m-%d"), to=end.strftime("%Y-%m-%d"),
            language='en', sort_by='relevancy'
        )
        sentiments = [analyzer.polarity_scores(article["title"])['compound'] for article in articles["articles"] if "title" in article and article["title"] is not None]
        avg_sentiment = np.mean(sentiments) if sentiments else 0.0
        sentiment_text = f"Average sentiment for {ticker}: {avg_sentiment:.2f}"
        return sentiment_text, avg_sentiment
    except Exception as e:
        print_log(f"Sentiment analysis failed: {str(e)}", 'ERROR')
        return f"Sentiment analysis failed: {str(e)}", None

def preprocess_data(df, features, target, window_size, horizon):
    try:
        print_log(f"Starting preprocessing: features={features}, target={target}, window={window_size}, horizon={horizon}")
        
        if not isinstance(df.index, pd.DatetimeIndex):
            raise ValueError("DataFrame index must be a DatetimeIndex for preprocessing.")

        # The target column must be included in the features for scaling
        all_features = list(set(features + [target]))
        updated_feature_cols = [f for f in all_features if f in df.columns]
        
        if not updated_feature_cols:
            raise ValueError("None of the selected features are available in the data.")

        data = df[updated_feature_cols].values
        
        # Scale all features
        feature_scaler = MinMaxScaler(feature_range=(0, 1))
        scaled_data = feature_scaler.fit_transform(data)
        
        # Scale the target column separately for inverse transform
        target_scaler = MinMaxScaler(feature_range=(0, 1))
        target_scaler.fit(df[[target]].values)

        # Get the index of the target column in the scaled data
        target_idx = updated_feature_cols.index(target)
        
        X, y = [], []
        for i in range(len(scaled_data) - window_size - horizon + 1):
            X.append(scaled_data[i:(i + window_size), :])
            # The target is the 'value' at the end of the window + horizon
            y.append(scaled_data[i + window_size + horizon - 1, target_idx])
            
        X, y = np.array(X), np.array(y)
        
        if X.shape[1] != window_size or X.shape[2] != len(updated_feature_cols):
            raise ValueError(f"Shape mismatch in X: expected ({len(scaled_data) - window_size - horizon + 1}, {window_size}, {len(updated_feature_cols)}), got {X.shape}")

        print_log(f"Preprocessing complete. X shape: {X.shape}, y shape: {y.shape}")
        return X, y, feature_scaler, target_scaler, updated_feature_cols, target_idx
    except Exception as e:
        print_log(f"Error in preprocess_data: {str(e)}", 'ERROR')
        raise ValueError(f"Failed to preprocess data: {str(e)}")