verbleiber 0.5.0

Log organizer whereabouts on events via RFID tags and buttons
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/*
 * Copyright 2022-2024 Jochen Kupperschmidt
 * License: MIT
 */

use evdev::{EventType, InputEvent, InputEventKind, Key};

use crate::model::UserId;

pub(crate) enum UserInput {
    User(UserId),
    Button(String),
}

pub(crate) struct StringReader {
    chars_read: String,
}

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

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

        if let InputEventKind::Key(key) = event.kind() {
            match key {
                Key::KEY_ENTER => {
                    let input = &self.chars_read.as_str().to_owned();

                    self.chars_read.clear();

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

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

pub(crate) fn handle_button_press(event: InputEvent) -> Option<UserInput> {
    if !is_key_released(event) {
        return None;
    }

    match event.kind() {
        InputEventKind::Key(key) => find_button_for_key(key),
        _ => None,
    }
}

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

fn find_button_for_key(key: Key) -> Option<UserInput> {
    match key {
        Key::BTN_TRIGGER => Some("button1".to_string()),
        Key::BTN_THUMB => Some("button2".to_string()),
        Key::BTN_THUMB2 => Some("button3".to_string()),
        Key::BTN_TOP => Some("button4".to_string()),
        _ => None,
    }
    .map(UserInput::Button)
}