use std::{cell::UnsafeCell, mem::MaybeUninit};

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

thread_local! {
    pub static HUMIDITY_ICON: UnsafeCell<MaybeUninit<Bmp<'static, Rgb565>>> = const { UnsafeCell::new(MaybeUninit::zeroed()) };
    pub static TEMPERATURE_ICON: UnsafeCell<MaybeUninit<Bmp<'static, Rgb565>>> = const { UnsafeCell::new(MaybeUninit::zeroed()) };
    pub static VOC_ICON: UnsafeCell<MaybeUninit<Bmp<'static, Rgb565>>> = const { UnsafeCell::new(MaybeUninit::zeroed()) };
    pub static CO2_ICON: UnsafeCell<MaybeUninit<Bmp<'static, Rgb565>>> = const { UnsafeCell::new(MaybeUninit::zeroed()) };
}

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

#[macro_export]
macro_rules! get_image {
    ($image:expr) => {
        unsafe {
            &*std::mem::transmute::<*mut MaybeUninit<Bmp<Rgb565>>, *mut Bmp<Rgb565>>(
                $image.with(|g| g.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");
    }
}