app.py

import gradio as gr
from datetime import datetime, date, timedelta
import plotly.graph_objects as go
import pandas as pd
from config import index_options, time_intervals, START_DATE, END_DATE, FORECAST_PERIOD
from data_fetcher import get_stocks_from_index
from stock_analysis import get_stock_graph_and_info

def validate_date(date_string):
    try:
        return datetime.strptime(date_string, "%Y-%m-%d").date()
    except ValueError:
        return None

def create_error_plot(error_message):
    fig = go.Figure()
    fig.add_annotation(x=0.5, y=0.5, text=error_message, showarrow=False, font_size=20)
    fig.update_layout(title="Error", xaxis_title="", yaxis_title="")
    return fig

demo = gr.Blocks()

with demo:
    d1 = gr.Dropdown(index_options, label='Please select Index...', info='Will be adding more indices later on', interactive=True)
    d2 = gr.Dropdown(label='Please Select Stock from your selected index', interactive=True)
    d3 = gr.Dropdown(time_intervals, label='Select Time Interval', value='1d', interactive=True)
    d4 = gr.Radio(['Line Graph', 'Candlestick Graph'], label='Select Graph Type', value='Line Graph', interactive=True)
    d5 = gr.Dropdown(['ARIMA', 'Prophet', 'LSTM'], label='Select Forecasting Method', value='ARIMA', interactive=True)
    
    date_start = gr.Textbox(label="Start Date (YYYY-MM-DD)", value=START_DATE.strftime("%Y-%m-%d"))
    date_end = gr.Textbox(label="End Date (YYYY-MM-DD)", value=END_DATE.strftime("%Y-%m-%d"))

    out_graph = gr.Plot()
    out_fundamentals = gr.DataFrame()

    inputs = [d1, d2, d3, d4, d5, date_start, date_end]
    outputs = [out_graph, out_fundamentals]

    def update_stock_options(index):
        stocks = get_stocks_from_index(index)
        return gr.Dropdown(choices=stocks)

    def process_inputs(*args):
        idx, stock, interval, graph_type, forecast_method, start_date, end_date = args
        
        start = validate_date(start_date)
        end = validate_date(end_date)
        
        if start is None or end is None:
            return create_error_plot("Invalid date format. Please use YYYY-MM-DD."), None
        
        if start > end:
            return create_error_plot("Start date must be before end date."), None
        
        try:
            fig, fundamentals = get_stock_graph_and_info(idx, stock, interval, graph_type, forecast_method, start, end)
            if not isinstance(fig, go.Figure):
                raise ValueError("Expected a plotly Figure object")
            if not isinstance(fundamentals, pd.DataFrame):
                raise ValueError("Expected a pandas DataFrame for fundamentals")
            return fig, fundamentals
        except Exception as e:
            error_message = f"An error occurred: {str(e)}"
            return create_error_plot(error_message), pd.DataFrame()

    d1.change(update_stock_options, d1, d2)
    d2.change(process_inputs, inputs, outputs)
    d3.change(process_inputs, inputs, outputs)
    d4.change(process_inputs, inputs, outputs)
    d5.change(process_inputs, inputs, outputs)
    date_start.change(process_inputs, inputs, outputs)
    date_end.change(process_inputs, inputs, outputs)

if __name__ == "__main__":
    demo.launch()