#![no_std]
#![no_main]

use core::arch::asm;

use lib_serial::{serial_println, serial_read};
use lib_ascii::{print, println, WRITER};

use limine::request::{RequestsEndMarker, RequestsStartMarker};
use limine::BaseRevision;

use lib_framebuffer;

/// Sets the base revision to the latest revision supported by the crate.
/// See specification for further info.
/// Be sure to mark all limine requests with #[used], otherwise they may be removed by the compiler.
#[used]
// The .requests section allows limine to find the requests faster and more safely.
#[link_section = ".requests"]
static BASE_REVISION: BaseRevision = BaseRevision::new();

/// Define the stand and end markers for Limine requests.
#[used]
#[link_section = ".requests_start_marker"]
static _START_MARKER: RequestsStartMarker = RequestsStartMarker::new();
#[used]
#[link_section = ".requests_end_marker"]
static _END_MARKER: RequestsEndMarker = RequestsEndMarker::new();

#[no_mangle]
unsafe extern "C" fn kmain() -> ! {
    // All limine requests must also be referenced in a called function, otherwise they may be
    // removed by the linker.
    assert!(BASE_REVISION.is_supported());


    if let Err(_) = lib_serial::init() {
        loop {}
    }

    let dimensions = lib_ascii::screensize_chars();
    let dimensions2 = lib_framebuffer::screensize_px();
    println!("Hello World!");
    println!("Dimensions: {}x{} (px)", dimensions2.0, dimensions2.1);
    println!("Dimensions: {}x{} (chars)", dimensions.0, dimensions.1);

    println!("
        $$$$$$$$\\                                  $$\\                     
        $$  _____|                                 $$ |                    
        $$ |    $$$$$$\\  $$\\   $$\\ $$$$$$$\\   $$$$$$$ | $$$$$$\\  $$\\   $$\\ 
        $$$$$\\ $$  __$$\\ $$ |  $$ |$$  __$$\\ $$  __$$ |$$  __$$\\ $$ |  $$ |
        $$  __|$$ /  $$ |$$ |  $$ |$$ |  $$ |$$ /  $$ |$$ |  \\__|$$ |  $$ |
        $$ |   $$ |  $$ |$$ |  $$ |$$ |  $$ |$$ |  $$ |$$ |      $$ |  $$ |
        $$ |   \\$$$$$$  |\\$$$$$$  |$$ |  $$ |\\$$$$$$$ |$$ |      \\$$$$$$$ |
        \\__|    \\______/  \\______/ \\__|  \\__| \\_______|\\__|       \\____$$ |
             $$$$$$\\   $$$$$$\\        $$\\    $$\\   $$\\           $$\\   $$ |
            $$  __$$\\ $$  __$$\\       $$ |   $$ |$$$$ |          \\$$$$$$  |
            $$ /  $$ |$$ /  \\__|      $$ |   $$ |\\_$$ |           \\______/ 
            $$ |  $$ |\\$$$$$$\\        \\$$\\  $$  |  $$ |                  
            $$ |  $$ | \\____$$\\        \\$$\\$$  /   $$ |                  
            $$ |  $$ |$$\\   $$ |        \\$$$  /    $$ |                  
             $$$$$$  |\\$$$$$$  |         \\$  /   $$$$$$\\                 
             \\______/  \\______/           \\_/    \\______|                              
    ");

    for i in 0u8..128 {
        print!("{}", i as char);
    }

    hcf();
}

#[panic_handler]
fn rust_panic(_info: &core::panic::PanicInfo) -> ! {
    hcf();
}

fn hcf() -> ! {
    loop {
        unsafe {
            #[cfg(target_arch = "x86_64")]
            asm!("hlt");
            #[cfg(any(target_arch = "aarch64", target_arch = "riscv64"))]
            asm!("wfi");
            #[cfg(target_arch = "loongarch64")]
            asm!("idle 0");
        }
    }
}