app.py

import streamlit as st
import pandas as pd
import plotly.graph_objects as go

# Load the Excel file
file_path = 'Dhaka Metro Rail Fare 2.XLSX'  # Ensure the correct file path
df = pd.read_excel(file_path)

# Ensure necessary columns are present
required_columns = ['Origin', 'Destination', 'Fare (৳)']
if not all(col in df.columns for col in required_columns):
    st.write("Please ensure the file contains 'Origin', 'Destination', and 'Fare' columns.")
else:
    # Add coordinates for each station (example coordinates for illustration)
    coordinates = {
        "Uttara North": (23.869066, 90.367445),
        "Uttara Center": (23.860118, 90.365106),
        "Uttara South": (23.845934, 90.363175),
        "Pallabi": (23.82619516961383, 90.36481554252525),
        "Mirpur 11": (23.819438208310213, 90.36528532902963),
        "Mirpur 10": (23.808582994847285, 90.36821595330717),
        "Kazipara": (23.800017952100532, 90.37178261495391),
        "Shewrapara": (23.79070140857881, 90.37564622631841),
        "Agargaon": (23.778385546736345, 90.3800557456356),
        "Bijoy Sarani": (23.766638127271825, 90.38307537134754),
        "Farmgate": (23.75923604938459, 90.38694218434738),
        "Kawran Bazar": (23.751392319539104, 90.39275707447003),
        "Shahbagh": (23.740324209546923, 90.39600784811131),
        "Dhaka University": (23.732091083122114, 90.39659408796354),
        "Bangladesh Secretariat": (23.73004754106779, 90.40764881366906),
        "Motijheel": (23.72816566933198, 90.41923497972823),
        "Kamalapur": (23.732367758919807, 90.42547378971085)
    }

    # Add latitude and longitude for origin and destination based on the coordinates dictionary
    df['Origin_Lat'] = df['Origin'].map(lambda x: coordinates.get(x, (None, None))[0])
    df['Origin_Lon'] = df['Origin'].map(lambda x: coordinates.get(x, (None, None))[1])
    df['Destination_Lat'] = df['Destination'].map(lambda x: coordinates.get(x, (None, None))[0])
    df['Destination_Lon'] = df['Destination'].map(lambda x: coordinates.get(x, (None, None))[1])

    # Filter rows with missing coordinates
    df.dropna(subset=['Origin_Lat', 'Origin_Lon', 'Destination_Lat', 'Destination_Lon'], inplace=True)

    # Streamlit UI setup
    st.title("Dhaka Metro Rail Fare Checker 🚇")
    st.write("Below is the fare chart for Dhaka Metro Rail 💶:")

    # Instruction sidebar
    st.sidebar.title("Instructions")
    st.sidebar.write("""
    **Welcome to the Dhaka Metro Rail Fare Checker!**
   
    *How to use:*
    1. Select your **Location station** from the dropdown menu.
    2. Select your **destination(s)** by clicking the destination buttons.
    3. The fare from your location to the selected destination(s) will be displayed below.
    4. You can also see the stations marked on a map.
    
    **Note:** The map highlights your location in green and destinations in blue.
    
    If you face any issues or need further assistance, feel free to [Contact Support on WhatsApp](https://wa.me/+8801719296601).
    """)

    # Define the default "Select Journey from" message
    default_origin = "Select Journey from"

    # Dropdown for selecting origin (with "Select Journey from" as a default placeholder)
    origin = st.selectbox(
        "Select your Location:", 
        [default_origin] + df['Origin'].unique().tolist(),  # Add the "Select Journey from" option at the top
        index=0  # Ensure the first option is selected by default
    )

    # Initialize session state for destination selection if not already set
    if 'destination_select' not in st.session_state:
        st.session_state.destination_select = []

    # Display buttons for each destination in 3 columns
    if origin != default_origin:
        st.write(f"Select your destination(s) from {origin}:")

        # Create 3 columns
        cols = st.columns(3)

        # Loop through all possible destinations and create a button for each in the columns
        dest_buttons = df['Destination'].unique()
        for i, dest in enumerate(dest_buttons):
            col_idx = i % 3  # Determine column index based on button position
            with cols[col_idx]:
                if st.button(f"Select {dest}", key=f"btn_{dest}"):
                    if dest not in st.session_state.destination_select:
                        st.session_state.destination_select.append(dest)
                    else:
                        st.session_state.destination_select.remove(dest)

        # Clear all selected destinations button
        if st.button("Clear All Destinations"):
            st.session_state.destination_select = []

    # Display selected destinations and calculate fares
    destinations = st.session_state.destination_select

    if origin == default_origin:
        st.write("Please select a valid origin station to proceed.")
    elif origin and destinations:
        # Filter the dataframe based on user selection
        fare_data = df[(df['Origin'] == origin) & (df['Destination'].isin(destinations))]

        # Display the fare data
        # Display the fare data in a creative and aesthetic format
        if not fare_data.empty:
            for index, row in fare_data.iterrows():
                origin_to_dest_fare = row['Fare (৳)']
                destination = row['Destination']
        
                # Creative output with icons, emojis, and styled text
                fare_message = f"""
                <div style="background-color: #f0f8ff; padding: 10px; margin-bottom: 12px; border-radius: 8px; box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);">
                    <h4 style="font-family: 'Arial', sans-serif; color: #003366;">
                        🚇 <strong>{origin}</strong> to <strong>{destination}</strong> Fare
                    </h4>
                    <p style="font-family: 'Arial', sans-serif; font-size: 18px; color: #009688;">
                        💵 Fare: <strong style="font-size: 20px; color: #e91e63;">{origin_to_dest_fare}৳</strong>
                    </p>
                    <p style="font-family: 'Arial', sans-serif; font-size: 14px; color: #555555;">
                        ✨ Enjoy your journey on the Dhaka Metro! 🚉
                    </p>
                </div>
                """
                st.markdown(fare_message, unsafe_allow_html=True)
        else:
            st.write("No fare data available for the selected origin and destinations.")
    else:
        st.write("Please select both an origin and at least one destination.")

    st.write("Below is the Map for Dhaka Metro Rail 💶:")

    # Plotting the map using Plotly
    fig = go.Figure()

    # Add markers for each unique station
    unique_stations = pd.concat([df[['Origin', 'Origin_Lat', 'Origin_Lon']].rename(columns={'Origin': 'Station', 'Origin_Lat': 'Lat', 'Origin_Lon': 'Lon'}), 
                                 df[['Destination', 'Destination_Lat', 'Destination_Lon']].rename(columns={'Destination': 'Station', 'Destination_Lat': 'Lat', 'Destination_Lon': 'Lon'})]).drop_duplicates()

    # Add a map marker for each station
    for i, row in unique_stations.iterrows():
        if row['Station'] == origin:
            # Mark the origin as green
            fig.add_trace(go.Scattermapbox(
                mode="markers+text",
                lon=[row['Lon']],
                lat=[row['Lat']],
                marker={'size': 12, 'color': 'green'},
                text=row['Station'],
                textposition="top center",
                name=row['Station'],
                customdata=[row['Station']]  # customdata is now a list
            ))
        elif row['Station'] in destinations:
            # Mark the destination as blue
            fig.add_trace(go.Scattermapbox(
                mode="markers+text",
                lon=[row['Lon']],
                lat=[row['Lat']],
                marker={'size': 12, 'color': 'blue'},
                text=row['Station'],
                textposition="top center",
                name=row['Station'],
                customdata=[row['Station']]  # customdata is now a list
            ))
        else:
            # Mark all other stations as red
            fig.add_trace(go.Scattermapbox(
                mode="markers+text",
                lon=[row['Lon']],
                lat=[row['Lat']],
                marker={'size': 12, 'color': 'red'},
                text=row['Station'],
                textposition="top center",
                name=row['Station'],
                customdata=[row['Station']]  # customdata is now a list
            ))

    # Map layout
    fig.update_layout(
        mapbox=dict(
            style="open-street-map",
            center=go.layout.mapbox.Center(lat=23.780, lon=90.400),  # Center on Dhaka
            zoom=11
        ),
        margin={"r":0,"t":0,"l":0,"b":0},
        showlegend=False,
        title="Dhaka Metro Rail Location Map"
    )

    # Show plot in Streamlit
    st.plotly_chart(fig)