app.py

import os
from shiny import App, ui, render, reactive
import fastf1 as ff1
import matplotlib.pyplot as plt
from matplotlib.collections import LineCollection
from matplotlib import cm
import numpy as np
import shinyswatch

# Define cache folder path
cache_path = os.getcwd() + "/cache"
print(f"Cache path: {cache_path}")

ff1.Cache.enable_cache(cache_path)

# Offline mode to prevent F1 API crashes on Hugging Face
ff1.Cache.offline_mode(enabled=True)

# Define drivers
drivers_2023 = {'Fastest driver': 'Fastest driver', 'VER': 'Max Verstappen', 
                'NOR': 'Lando Norris', 'GAS': 'Pierre Gasly', 'PER': 'Sergio Perez', 
                'ALO': 'Fernando Alonso', 'LEC': 'Charles Leclerc', 'STR': 'Lance Stroll', 
                'MAG': 'Kevin Magnussen', 'TSU': 'Yuki Tsunoda', 'ALB': 'Alexander Albon',
                'ZHO': 'Guanyu Zhou', 'HUL': 'Nico Hülkenberg', 'OCO': 'Esteban Ocon',
                'HAM': 'Lewis Hamilton', 'SAI': 'Carlos Sainz', 'RUS': 'George Russel',
                'BOT': 'Valteri Bottas', 'PIA': 'Oscar Piastri', 'VRI': 'Nyck de Vries',
                'SAR': 'Logan Sargeant', 'RIC': 'Daniel Ricciardo'}

drivers_2022 = {'Fastest driver': 'Fastest driver', 'VER': 'Max Verstappen', 
                'NOR': 'Lando Norris', 'GAS': 'Pierre Gasly', 'PER': 'Sergio Perez', 
                'ALO': 'Fernando Alonso', 'LEC': 'Charles Leclerc', 'STR': 'Lance Stroll', 
                'MAG': 'Kevin Magnussen', 'TSU': 'Yuki Tsunoda', 'ALB': 'Alexander Albon',
                'ZHO': 'Guanyu Zhou', 'HUL': 'Nico Hülkenberg', 'OCO': 'Esteban Ocon',
                'HAM': 'Lewis Hamilton', 'SAI': 'Carlos Sainz', 'RUS': 'George Russel',
                'BOT': 'Valteri Bottas', 'VRI': 'Nyck de Vries', 'VET': 'Sebastian Vettel',
                'RIC': 'Daniel Ricciardo', 'MSC': 'Mick Schumacher',
                'LAT': 'Nicolas Latifi'}

app_ui = ui.page_fluid(
    shinyswatch.theme.minty(),
    ui.panel_title("Gear usage in fastest lap"),
    ui.layout_sidebar(
        ui.panel_sidebar(
            ui.input_select(
                "track_select", "Select track:",
                choices = ["Austria", "Hungary", "Spain", "Bahrain", "Great-Brittain"],
                selected = "Austria"
            ),
            ui.input_select(
                "driver_select", label="Select driver:",
                choices = ["Fastest driver"],
                selected = "Fastest driver"
            ),
            ui.input_radio_buttons(
                "session_type", "Session type:", 
                choices = {"R": "Race", "Q": "Qualification"}, 
                selected = "R"
            ),
            ui.input_radio_buttons(
                "year", "Year:", 
                choices = ["2023", "2022"], 
                selected = "2023"
            ),
            width=2
        ),
        
        ui.panel_main(
            ui.output_plot("gear"),
            ui.output_text("fastest_driver")
        ),
    ),
)   

def server(input, output, session):
    @reactive.Effect()
    def _():
        if input.year() == "2023":
            driver_options = drivers_2023
        elif input.year() == "2022":
            driver_options = drivers_2022
            
        ui.update_select("driver_select",
            label="Select driver:",
            choices=driver_options,
            selected=input.driver_select()
        )
    
    @reactive.Calc
    def get_data():
        try:
            f1_session = ff1.get_session(int(input.year()), input.track_select(), input.session_type())
            f1_session.load()

            # Check if user input == fastest driver
            if input.driver_select() == "Fastest driver":
                lap = f1_session.laps.pick_fastest()
            else:
                laps_driver = f1_session.laps.pick_driver(input.driver_select())
                lap = laps_driver.pick_fastest()
            
            tel = lap.get_telemetry()
            driver = lap['Driver']

            #converting data to numpy data tables
            x = np.array(tel['X'].values)
            y = np.array(tel['Y'].values)

            points = np.array([x, y]).T.reshape(-1, 1, 2)
            segments = np.concatenate([points[:-1], points[1:]], axis=1)
            gear = tel['nGear'].to_numpy().astype(float)
            return segments, gear, driver

        except Exception:
            pass
        
    
    @output
    @render.text
    def fastest_driver():
        segments, gear, driver = get_data()
        #print(f"The driver of the fastest lap this session is: {driver}")
        return f"Fastest lap this session of: {driver}"

    @output
    @render.plot
    def gear():
        try:
            segments, gear, driver = get_data()
            
            cmap = cm.get_cmap('Paired')
            lc_comp = LineCollection(segments, norm=plt.Normalize(1, cmap.N+1), cmap=cmap)
            lc_comp.set_array(gear)
            lc_comp.set_linewidth(4)

            plt.gca().add_collection(lc_comp)
            plt.axis('equal')
            plt.tick_params(labelleft=False, left=False, labelbottom=False, bottom=False)

            cbar = plt.colorbar(mappable=lc_comp, label="Gear", boundaries=np.arange(1, 10))
            cbar.set_ticks(np.arange(1.5, 9.5))
            cbar.set_ticklabels(np.arange(1, 9))
    
            plt

        except Exception:
            ui.notification_show("Data not available. Select another track or driver.", duration=10, type = 'error')


app = App(app_ui, server)