import gradio as gr
import pandas as pd
import requests
from prophet import Prophet
import logging
import plotly.graph_objs as go

logging.basicConfig(level=logging.INFO)

########################################
# OKX endpoints & utility
########################################

OKX_TICKERS_ENDPOINT = "https://www.okx.com/api/v5/market/tickers?instType=SPOT"
OKX_CANDLE_ENDPOINT = "https://www.okx.com/api/v5/market/candles"

TIMEFRAME_MAPPING = {
    "1m": "1m",
    "5m": "5m",
    "15m": "15m",
    "30m": "30m",
    "1h": "1H",
    "2h": "2H",
    "4h": "4H",
    "6h": "6H",
    "12h": "12H",
    "1d": "1D",
    "1w": "1W",
}

def fetch_okx_symbols():
    """
    Fetch the list of symbols (instId) from OKX Spot tickers.
    """
    logging.info("Fetching symbols from OKX Spot tickers...")
    try:
        resp = requests.get(OKX_TICKERS_ENDPOINT, timeout=30)
        resp.raise_for_status()
        json_data = resp.json()

        if json_data.get("code") != "0":
            logging.error(f"Non-zero code returned: {json_data}")
            return ["Error: Could not fetch OKX symbols"]

        data = json_data.get("data", [])
        symbols = [item["instId"] for item in data if item.get("instType") == "SPOT"]
        if not symbols:
            logging.warning("No spot symbols found.")
            return ["Error: No spot symbols found."]
        
        logging.info(f"Fetched {len(symbols)} OKX spot symbols.")
        return sorted(symbols)

    except Exception as e:
        logging.error(f"Error fetching OKX symbols: {e}")
        return [f"Error: {str(e)}"]

def fetch_okx_candles(symbol, timeframe="1H", limit=500):
    """
    Fetch historical candle data for a symbol from OKX.

    Data columns (9):
    [ts, o, h, l, c, vol, volCcy, volCcyQuote, confirm]
    """
    logging.info(f"Fetching {limit} candles for {symbol} @ {timeframe} from OKX...")
    params = {
        "instId": symbol,
        "bar": timeframe,
        "limit": limit
    }

    try:
        resp = requests.get(OKX_CANDLE_ENDPOINT, params=params, timeout=30)
        resp.raise_for_status()
        json_data = resp.json()

        if json_data.get("code") != "0":
            msg = f"OKX returned code={json_data.get('code')}, msg={json_data.get('msg')}"
            logging.error(msg)
            return pd.DataFrame(), msg

        items = json_data.get("data", [])
        if not items:
            warning_msg = f"No candle data returned for {symbol}."
            logging.warning(warning_msg)
            return pd.DataFrame(), warning_msg
        
        # Reverse to chronological (OKX returns newest first)
        items.reverse()

        columns = [
            "ts", "o", "h", "l", "c", "vol",
            "volCcy", "volCcyQuote", "confirm"
        ]
        df = pd.DataFrame(items, columns=columns)
        df.rename(columns={
            "ts": "timestamp",
            "o": "open",
            "h": "high",
            "l": "low",
            "c": "close"
        }, inplace=True)

        df["timestamp"] = pd.to_datetime(df["timestamp"], unit="ms")
        numeric_cols = ["open", "high", "low", "close", "vol", "volCcy", "volCcyQuote", "confirm"]
        df[numeric_cols] = df[numeric_cols].astype(float)

        logging.info(f"Fetched {len(df)} rows for {symbol}.")
        return df, ""

    except Exception as e:
        err_msg = f"Error fetching candles for {symbol}: {e}"
        logging.error(err_msg)
        return pd.DataFrame(), err_msg

########################################
# Prophet pipeline
########################################

def prepare_data_for_prophet(df):
    """
    Convert the DataFrame to a Prophet-compatible format.
    """
    if df.empty:
        logging.warning("Empty DataFrame, cannot prepare data for Prophet.")
        return pd.DataFrame(columns=["ds", "y"])

    df_prophet = df.rename(columns={"timestamp": "ds", "close": "y"})
    return df_prophet[["ds", "y"]]

def prophet_forecast(df_prophet, periods=10, freq="h"):
    """
    Train a Prophet model and forecast.
    Using 'h' or 'd' for freq to avoid future deprecation warnings in pandas.
    """
    if df_prophet.empty:
        logging.warning("Prophet input is empty, no forecast can be generated.")
        return pd.DataFrame(), "No data to forecast."

    try:
        model = Prophet()
        model.fit(df_prophet)
        future = model.make_future_dataframe(periods=periods, freq=freq)
        forecast = model.predict(future)
        return forecast, ""
    except Exception as e:
        logging.error(f"Forecast error: {e}")
        return pd.DataFrame(), f"Forecast error: {e}"

def prophet_wrapper(df_prophet, forecast_steps, freq):
    """
    Forecast, then slice out only the new/future rows using .loc.
    """
    if len(df_prophet) < 10:
        return pd.DataFrame(), "Not enough data for forecasting (need >=10 rows)."

    full_forecast, err = prophet_forecast(df_prophet, forecast_steps, freq)
    if err:
        return pd.DataFrame(), err

    # Only future portion
    future_only = full_forecast.loc[len(df_prophet):, ["ds", "yhat", "yhat_lower", "yhat_upper"]]
    return future_only, ""

########################################
# Plot helper
########################################

def create_line_plot(forecast_df):
    """
    Create a Plotly line chart with the future forecast (ds vs yhat).
    We'll shade the region between yhat_lower and yhat_upper.
    """
    if forecast_df.empty:
        return go.Figure()  # empty figure if no data

    fig = go.Figure()
    # Main forecast
    fig.add_trace(go.Scatter(
        x=forecast_df["ds"],
        y=forecast_df["yhat"],
        mode="lines",
        name="Forecast",
        line=dict(color="blue")
    ))

    # Lower bound
    fig.add_trace(go.Scatter(
        x=forecast_df["ds"],
        y=forecast_df["yhat_lower"],
        fill=None,
        mode="lines",
        line=dict(width=0, color="lightblue"),
        name="Lower"
    ))

    # Upper bound
    fig.add_trace(go.Scatter(
        x=forecast_df["ds"],
        y=forecast_df["yhat_upper"],
        fill="tonexty",  # fill area between upper & lower
        mode="lines",
        line=dict(width=0, color="lightblue"),
        name="Upper"
    ))

    fig.update_layout(
        title="Forecasted Prices",
        xaxis_title="Timestamp",
        yaxis_title="Price",
        hovermode="x"
    )
    return fig

########################################
# Main Gradio logic
########################################

def predict(symbol, timeframe, forecast_steps):
    """
    Orchestrate candle fetch + prophet forecast.
    """
    okx_bar = TIMEFRAME_MAPPING.get(timeframe, "1H")
    df_raw, err = fetch_okx_candles(symbol, timeframe=okx_bar, limit=500)
    if err:
        return pd.DataFrame(), err

    df_prophet = prepare_data_for_prophet(df_raw)
    freq = "h" if "h" in timeframe.lower() else "d"
    future_df, err2 = prophet_wrapper(df_prophet, forecast_steps, freq)
    if err2:
        return pd.DataFrame(), err2

    return future_df, ""

def display_forecast(symbol, timeframe, forecast_steps):
    logging.info(f"User requested: symbol={symbol}, timeframe={timeframe}, steps={forecast_steps}")
    forecast_df, error = predict(symbol, timeframe, forecast_steps)
    if error:
        return None, f"Error: {error}"

    fig = create_line_plot(forecast_df)
    return fig, forecast_df

def main():
    # Fetch OKX symbols
    symbols = fetch_okx_symbols()
    if not symbols or "Error" in symbols[0]:
        symbols = ["No symbols available"]

    with gr.Blocks() as demo:
        gr.Markdown("# Crypto Price Forecasting with Prophet")
        gr.Markdown(
            "This app gathers recent candles from OKX's spot market and makes short-term predictions using Prophet. "
            "You can pick any available symbol and timeframe, then see a future forecast (no historical lines) in a line chart and table."
        )

        symbol_dd = gr.Dropdown(
            label="Symbol",
            choices=symbols,
            value=symbols[0] if symbols else None
        )
        timeframe_dd = gr.Dropdown(
            label="Timeframe",
            choices=["1m", "5m", "15m", "30m", "1h", "2h", "4h", "6h", "12h", "1d", "1w"],
            value="1h"
        )
        steps_slider = gr.Slider(
            label="Forecast Steps",
            minimum=1,
            maximum=100,
            value=10
        )
        forecast_btn = gr.Button("Generate Forecast")

        # First output: the line chart
        chart_output = gr.Plot(label="Forecast Chart")

        # Second output: the forecast dataframe
        df_output = gr.Dataframe(
            label="Forecast (Future Only)",
            headers=["ds", "yhat", "yhat_lower", "yhat_upper"]
        )

        # We return two items from display_forecast: (chart, df)
        forecast_btn.click(
            fn=display_forecast,
            inputs=[symbol_dd, timeframe_dd, steps_slider],
            outputs=[chart_output, df_output]
        )

        gr.Markdown(
            "For automated trading tools, consider Gunbot as your next [crypto trading bot](https://www.gunbot.com)."
        )


    return demo

if __name__ == "__main__":
    app = main()
    app.launch()