#![no_std]
#![no_main]

mod buttons;

use core::panic::PanicInfo;

use arduino_hal::{default_serial, delay_ms, pins, Peripherals};
use buttons::{Button, BUTTON_COUNT};

const MESSAGE_START: char = '<';
const MESSAGE_END: char = '>';

#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
    // disable interrupts - firmware has panicked so no ISRs should continue running
    avr_device::interrupt::disable();

    // get the peripherals so we can access serial and the LED.
    //
    // SAFETY: Because main() already has references to the peripherals this is an unsafe
    // operation - but because no other code can run after the panic handler was called,
    // we know it is okay.
    let dp = unsafe { Peripherals::steal() };
    let pins = pins!(dp);

    let mut led = pins.d13.into_output();

    loop {
        led.toggle();
        delay_ms(500);
    }
}

#[arduino_hal::entry]
fn main() -> ! {
    let dp = Peripherals::take().unwrap();
    let pins = pins!(dp);

    pins.d13.into_output().set_high();

    let mut buttons: [Button; BUTTON_COUNT] = [
        Button {
            index: 1,
            pin: pins.d5.into_pull_up_input().downgrade(),
            is_low: true,
        },
        Button {
            index: 2,
            pin: pins.d6.into_pull_up_input().downgrade(),
            is_low: true,
        },
        Button {
            index: 3,
            pin: pins.d7.into_pull_up_input().downgrade(),
            is_low: true,
        },
        Button {
            index: 4,
            pin: pins.d8.into_pull_up_input().downgrade(),
            is_low: true,
        },
        Button {
            index: 5,
            pin: pins.d9.into_pull_up_input().downgrade(),
            is_low: true,
        },
        Button {
            index: 6,
            pin: pins.d10.into_pull_up_input().downgrade(),
            is_low: true,
        },
        Button {
            index: 7,
            pin: pins.d11.into_pull_up_input().downgrade(),
            is_low: true,
        },
        Button {
            index: 8,
            pin: pins.d12.into_pull_up_input().downgrade(),
            is_low: true,
        },
    ];

    let mut serial = default_serial!(dp, pins, 57600);

    loop {
        for button in buttons.iter_mut() {
            button.check_state(|index, pressed| {
                if !pressed {
                    ufmt::uwriteln!(&mut serial, "{}{}{}", MESSAGE_START, index, MESSAGE_END)
                        .unwrap();
                }
            })
        }
    }
}