//! Touch diagnostics. Replaces v1's tools/diag.sh and tools/find-device.sh.
//!
//! The question it exists to answer is "the panel works, so why does nothing
//! happen?" -- which in v1 meant reading lisgd's `Cfg(f=1) <=> Evt(f=2)` output
//! and knowing that meant the contact count. Here the answer is printed in
//! English instead.

use anyhow::{bail, Result};

use crate::config::Config;
use crate::input::{list_touchscreens, Event, Touchpanel};

pub fn list() -> Result<()> {
    let found = list_touchscreens();
    if found.is_empty() {
        bail!(
            "no multitouch devices found under /dev/input/by-id/.\n\
             If the panel is plugged in, you may not have permission to read the \
             devices: install the udev rule or join the 'input' group and log back in."
        );
    }
    println!("Multitouch devices:\n");
    for (path, name) in found {
        println!("  {name}\n    {path}\n");
    }
    println!("Put the path in touch.device. Always the by-id path -- eventN numbers");
    println!("get reshuffled on reboot or USB re-enumeration.");
    Ok(())
}

pub fn run(cfg: &Config) -> Result<()> {
    println!("Watching {}", cfg.touch.device);
    println!(
        "  panel {}x{}, threshold {}px, leniency {}\u{b0}, contacts accepted: {:?}",
        cfg.touch.width, cfg.touch.height, cfg.touch.threshold, cfg.touch.leniency, cfg.touch.fingers
    );
    println!(
        "  grab: {}\n",
        if cfg.touch.grab {
            "yes -- X will not see these touches"
        } else {
            "no -- X also receives these touches"
        }
    );
    println!("Swipe left, right, up and down. Ctrl-C when done.\n");

    let mut panel = Touchpanel::open(&cfg.touch)?;
    let g = &cfg.gestures;

    panel.run(|ev| {
        match ev {
            Event::Swipe(s) => {
                let action = match s.direction {
                    d if d == g.forward => "forward",
                    d if d == g.back => "back",
                    d if d == g.up => "up",
                    d if d == g.down => "down",
                    _ => "not bound to anything",
                };
                println!(
                    "  {:?} swipe, {} contact(s)  ->  {action}",
                    s.direction, s.fingers
                );
            }
            Event::Discarded(dir, why) => {
                println!("  {dir:?} swipe ignored: {why}");
            }
        }
        true
    })
}