#![no_std]
#![no_main]

use core::panic::PanicInfo;

use embassy_executor::Spawner;
use embassy_rp::{
    bind_interrupts,
    gpio::{Level, Output},
    peripherals::{PIN_15, PIO0, USB},
    pio::{InterruptHandler as PioInterruptHandler, Pio},
    usb::{Driver, InterruptHandler as USBInterrupthandler},
};
use embassy_time::Timer;

use dht_pio::{Dht, Dht22, DhtError};

#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
    loop {
        unsafe {
            PANIC_LED.as_mut().unwrap().set_high();
        }
    }
}

static mut PANIC_LED: Option<Output<'static, PIN_15>> = None;

bind_interrupts!(struct Irqs {
    PIO0_IRQ_0 => PioInterruptHandler<PIO0>;
    USBCTRL_IRQ => USBInterrupthandler<USB>;
});

#[embassy_executor::task]
async fn logger_task(driver: Driver<'static, USB>) {
    embassy_usb_logger::run!(1024, log::LevelFilter::Info, driver);
}

#[embassy_executor::main]
async fn main(spawner: Spawner) {
    let p = embassy_rp::init(Default::default());

    unsafe {
        PANIC_LED = Some(Output::new(p.PIN_15, Level::Low));
    }

    let driver = Driver::new(p.USB, Irqs);
    spawner.spawn(logger_task(driver)).unwrap();

    // pio access
    let pio = p.PIO0;
    let Pio {
        mut common,

        // dht22 state machine
        sm1,
        ..
    } = Pio::new(pio, Irqs);

    // create DHT22
    let mut dht = Dht22::new(&mut common, sm1, p.PIN_0);

    let dht_reading = async {
        loop {
            match dht.read().await {
                Ok(reading) => {
                    log::info!("temp: {}, humid: {}", reading.temperature, reading.humidity);
                }
                Err(err) => match err {
                    DhtError::Timeout => log::info!("dht timeout error"),
                    DhtError::CrcMismatch(data, crc) => {
                        log::info!("dht checksum error:\ndata: {data:032b}\ncrc:  {crc:032b}");
                    }
                    DhtError::ReadError => log::info!("dht read error"),
                },
            }

            Timer::after_secs(1).await;
        }
    };

    dht_reading.await;
}