#![no_std]
#![no_main]

mod rfid;

use core::cell::RefCell;
use embassy_executor::Spawner;
use embassy_time::{Duration, Timer};
use embedded_hal_async::{digital::OutputPin, spi::SpiDevice};
use esp_backtrace as _;
use esp_hal::{
    clock::ClockControl,
    embassy,
    gpio::{IO, Output, PushPull},
    peripherals::Peripherals,
    prelude::*,
    spi::{master::Spi, SpiMode},
    system::SystemControl,
    timer::{timg::TimerGroup, ErasedTimer, OneShotTimer},
    spi::SpiDeviceDriver,
};
use static_cell::StaticCell;
use rfid::Rfid;

macro_rules! mk_static {
    ($t:ty,$val:expr) => {{
        static STATIC_CELL: StaticCell<$t> = StaticCell::new();
        STATIC_CELL.init($val)
    }};
}

#[embassy_executor::task]
async fn rfid_task(mut rfid: Rfid<SpiDeviceDriver<'static>, Output<'static, PushPull>>) {
    rfid.init().await.unwrap();
    esp_println::println!("RFID initialized.");

    loop {
        esp_println::println!("Waiting for RFID scan...");
        Timer::after(Duration::from_secs(2)).await;
    }
}

#[main]
async fn main(spawner: Spawner) {
    esp_println::logger::init_logger_from_env();
    esp_println::println!("Booting...");

    let peripherals = Peripherals::take();
    let system = SystemControl::new(peripherals.SYSTEM);
    let clocks = ClockControl::boot_defaults(system.clock_control).freeze();

    // Initialize Embassy
    let timg0 = TimerGroup::new(peripherals.TIMG0, &clocks, None);
    let timer0 = OneShotTimer::new(timg0.timer0.into());
    let timers = mk_static!([OneShotTimer<ErasedTimer>; 1], [timer0]);
    embassy::init(&clocks, timers);

    // GPIO and SPI
    let io = IO::new(peripherals.GPIO, peripherals.IO_MUX);
    let sck = io.pins.gpio18;
    let mosi = io.pins.gpio23;
    let miso = io.pins.gpio19;
    let cs = io.pins.gpio5;
    let rst = io.pins.gpio21.into_push_pull_output(); // important

    let spi = Spi::new(
        peripherals.SPI2,
        sck,
        mosi,
        miso,
        1.MHz(),
        SpiMode::Mode0,
        &clocks,
    );

    let spi_dev = SpiDeviceDriver::new(spi, cs).unwrap();

    let rfid = Rfid::new(spi_dev, rst);

    spawner.spawn(rfid_task(rfid)).ok();

    loop {
        Timer::after(Duration::from_secs(10)).await;
    }
}