verbleiber 0.8.1

Log organizer whereabouts on events via RFID tags and buttons
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/*
 * Copyright 2022-2025 Jochen Kupperschmidt
 * License: MIT
 */

use std::thread;

use anyhow::Result;
use evdev::{Device, EventSummary, EventType, InputEvent, KeyCode};
use flume::Sender;

use crate::devices;
use crate::events::Event;

pub(crate) fn handle_tag_reads(device_name: String, sender: Sender<Event>) -> Result<()> {
    let device = open_device(device_name)?;

    let tag_read_handler = TagReadHandler::new(sender);
    thread::spawn(move || tag_read_handler.run(device));
    Ok(())
}

fn open_device(device_name: String) -> Result<Device> {
    let device_label = "reader input device".to_string();
    devices::open_input_device(device_name, device_label)
}

struct TagReadHandler {
    sender: Sender<Event>,
}

impl TagReadHandler {
    fn new(sender: Sender<Event>) -> Self {
        Self { sender }
    }

    fn run(&self, mut device: Device) -> Result<()> {
        let mut tag_reader = TagReader::new();
        loop {
            for event in device.fetch_events()? {
                if let Some(value) = tag_reader.handle_event(event) {
                    let event = Event::TagRead {
                        tag: value.to_string(),
                    };
                    self.sender.send(event)?;
                }
            }
        }
    }
}

struct TagReader {
    chars_read: String,
}

impl TagReader {
    fn new() -> Self {
        Self {
            chars_read: String::new(),
        }
    }

    fn handle_event(&mut self, event: InputEvent) -> Option<String> {
        if !self.is_key_released(event) {
            return None;
        }

        if let EventSummary::Key(_, key_code, 0) = event.destructure() {
            match key_code {
                KeyCode::KEY_ENTER => {
                    let input = &self.chars_read.as_str().to_owned();

                    self.chars_read.clear();

                    Some(input.to_owned())
                }
                key_code => match self.get_char(key_code) {
                    Some(ch) => {
                        self.chars_read.push(ch);
                        None
                    }
                    None => None,
                },
            }
        } else {
            None
        }
    }

    fn is_key_released(&self, event: InputEvent) -> bool {
        event.event_type() == EventType::KEY && event.value() == 0
    }

    fn get_char(&self, key_code: KeyCode) -> Option<char> {
        match key_code {
            KeyCode::KEY_1 => Some('1'),
            KeyCode::KEY_2 => Some('2'),
            KeyCode::KEY_3 => Some('3'),
            KeyCode::KEY_4 => Some('4'),
            KeyCode::KEY_5 => Some('5'),
            KeyCode::KEY_6 => Some('6'),
            KeyCode::KEY_7 => Some('7'),
            KeyCode::KEY_8 => Some('8'),
            KeyCode::KEY_9 => Some('9'),
            KeyCode::KEY_0 => Some('0'),
            _ => None,
        }
    }
}