use core::cell::UnsafeCell;
use core::include_bytes;
use core::mem::MaybeUninit;

use critical_section::Mutex;
use embedded_graphics::pixelcolor::Rgb565;
use tinybmp::Bmp;

pub type StaticImage = Mutex<UnsafeCell<MaybeUninit<Bmp<'static, Rgb565>>>>;

#[rustfmt::skip]
pub static HUMIDITY_ICON: StaticImage = Mutex::new(UnsafeCell::new(MaybeUninit::zeroed()));
pub static TEMPERATURE_ICON: StaticImage = Mutex::new(UnsafeCell::new(MaybeUninit::zeroed()));
pub static VOC_ICON: StaticImage = Mutex::new(UnsafeCell::new(MaybeUninit::zeroed()));
pub static CO2_ICON: StaticImage = Mutex::new(UnsafeCell::new(MaybeUninit::zeroed()));

// Tendency indicators
pub static TENDENCY_RISING: StaticImage = Mutex::new(UnsafeCell::new(MaybeUninit::zeroed()));
pub static TENDENCY_STEADY: StaticImage = Mutex::new(UnsafeCell::new(MaybeUninit::zeroed()));
pub static TENDENCY_FALLING: StaticImage = Mutex::new(UnsafeCell::new(MaybeUninit::zeroed()));

macro_rules! load_image {
    ($stat:expr, $path:expr) => {
        critical_section::with(|cs| {
            *$stat.borrow(cs).get() =
                MaybeUninit::new(Bmp::from_slice(include_bytes!($path)).unwrap());
        })
    };
}

#[macro_export]
macro_rules! get_image {
    ($image:expr) => {
        unsafe {
            use core::mem::MaybeUninit;
            use tinybmp::Bmp;
            &*core::mem::transmute::<*mut MaybeUninit<Bmp<Rgb565>>, *mut Bmp<Rgb565>>(
                critical_section::with(|cs| $image.borrow(cs).get()),
            )
        }
    };
}

pub fn prepare_images() {
    unsafe {
        load_image!(HUMIDITY_ICON, "../../assets/humidity-icon.bmp");
        load_image!(TEMPERATURE_ICON, "../../assets/temperature-icon.bmp");
        load_image!(VOC_ICON, "../../assets/voc-icon.bmp");
        load_image!(CO2_ICON, "../../assets/co2-icon.bmp");

        load_image!(TENDENCY_RISING, "../../assets/indic-rising.bmp");
        load_image!(TENDENCY_STEADY, "../../assets/indic-steady.bmp");
        load_image!(TENDENCY_FALLING, "../../assets/indic-falling.bmp");
    }
}