use nannou::prelude::*;
use once_cell::sync::Lazy;

static RECORDING: Lazy<bool> = Lazy::new(|| {
    let args: Vec<String> = std::env::args().collect();
    args.iter().any(|s| s == "--record")
});

pub fn record(app: &App, frame: &Frame) {
    if !*RECORDING {
        return;
    }
    // save frame
    let path = app
        .project_path()
        .expect("failed to locate `project_path`")
        // Capture all frames to a directory called `/<path_to_nannou>/nannou/simple_capture`.
        .join("recordings")
        // Name each file after the number of the frame.
        .join(format!("{:05}", frame.nth()))
        // The extension will be PNG. We also support tiff, bmp, gif, jpeg, webp and some others.
        .with_extension("png");
    println!("frame: {} {:.05}", frame.nth(), frame.nth() as f32 / 60.0);
    app.main_window().capture_frame(path);
}

pub fn delta_t(app: &App) -> f64 {
    if *RECORDING {
        1.0 / 60.0
    } else {
        app.duration.since_prev_update.as_secs_f64()
    }
}