#![no_std]
#![cfg_attr(test, no_main)]
#![feature(custom_test_frameworks)]
#![test_runner(crate::test_runner)]
#![reexport_test_harness_main = "test_main"]
#![feature(abi_x86_interrupt)]
#![feature(alloc_error_handler)]
#![feature(async_fn_in_trait)]
#![feature(async_closure)]
#![feature(global_asm)]
#![feature(inherent_associated_types)]


use alloc::string::String;
use alloc::vec;
use bootloader::{entry_point, BootInfo};
use core::panic::PanicInfo;
extern crate alloc;


pub mod system;
pub mod user;
pub use system::std as std;
pub use user::bin::*;
use crate::calc::Calculator;
use crate::std::application::Application;


#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[repr(u32)]
pub enum QemuExitCode {
	Ok = 0x10,
	Err = 0x11,
}

pub fn poweroff() {
	exit(QemuExitCode::Ok);
}

pub fn exit(code: QemuExitCode) {
	use x86_64::instructions::port::Port;

	unsafe {
		let mut port = Port::new(0xf4);
		port.write(code as u32);
	}
	println!("e");
}

#[alloc_error_handler]
fn alloc_error_handler(layout: alloc::alloc::Layout) -> ! {
	panic!("error while allocating: {:?}", layout)
}

pub fn start(boot_info: &'static BootInfo) {
	system::init(boot_info);
}

pub fn hlt() -> ! {
	loop {
		x86_64::instructions::hlt();
	}
}


#[cfg(test)]
entry_point!(test_kernel_main);

#[cfg(test)]
fn test_kernel_main(boot_info: &'static BootInfo) -> ! {
	system::init(boot_info);
	test_main();
	hlt();
}

pub trait Testable {
	fn run(&self) -> ();
}

impl<T> Testable for T where T: Fn(), {
	fn run(&self) {
		serial_print!("{}...\t", core::any::type_name::<T>());
		self();
		serial_println!("OK");
	}
}

pub fn test_runner(tests: &[&dyn Testable]) {
	serial_println!("Running {} tests", tests.len());
	for test in tests {
		test.run();
	}
	exit(QemuExitCode::Ok);
}

pub fn test_panic_handler(info: &PanicInfo) -> ! {
	serial_println!("ERR");
	serial_println!("Error: {}\n", info);
	exit(QemuExitCode::Err);
	hlt();
}


#[cfg(test)]
#[panic_handler]
fn panic(info: &PanicInfo) -> ! {
	test_panic_handler(info)
}



#[cfg(test)]
#[test_case]
fn trivial_assertion() {
	assert_eq!(1, 1);
}