import streamlit as st
from datetime import date

import yfinance as yf
from prophet import Prophet
from prophet.plot import plot_plotly
from plotly import graph_objs as go
import pandas as pd

START = "2015-01-01"
TODAY = date.today().strftime("%Y-%m-%d")

st.title("Stock Prediction App")

stocks = ("AAPL", "GOOGL", "MSFT", "GME")

selected_stock = st.selectbox("Select dataset for prediction", stocks)

n_years = st.slider("Years of prediction:", 1, 4)
period = n_years * 365

@st.cache_data
def load_data(ticker):
    data = yf.download(ticker, START, TODAY)
    data.reset_index(inplace=True)
    
    # Debug: Check column structure
    print("Original columns:", data.columns)
    
    # Handle MultiIndex columns
    if isinstance(data.columns, pd.MultiIndex):
        new_columns = []
        for col in data.columns:
            if col[1] == '':  # For 'Date' column
                new_columns.append(col[0])
            else:  # For price columns like ('Open', 'AAPL')
                new_columns.append(col[0])
        data.columns = new_columns
    
    return data

data_load_state = st.text("Load data...")
data = load_data(selected_stock)
data_load_state.text("Loading data...done!")

st.subheader('Raw data')
st.write(data.tail())

def plot_raw_data():
    fig = go.Figure()
    fig.add_trace(go.Scatter(x=data['Date'], y=data['Open'], name = 'stock_open'))
    fig.add_trace(go.Scatter(x=data['Date'], y=data['Close'], name = 'stock_close'))
    fig.update_layout(title_text="Time Series Data", xaxis_rangeslider_visible=True)
    st.plotly_chart(fig)
    
plot_raw_data()

# Forecasting
df_train = data[['Date', 'Close']]
df_train = df_train.rename(columns={"Date": "ds", "Close": "y"})

m = Prophet()
m.fit(df_train)

future = m.make_future_dataframe(periods=period)
forecast = m.predict(future)

st.subheader('Forecast data')
st.write(forecast.tail())

st.write('forecast data')
fig1 = plot_plotly(m, forecast)
st.plotly_chart(fig1)

st.write('forecast components')
fig2 = m.plot_components(forecast)
st.write(fig2)