#![feature(lang_items)]
#![feature(const_fn)]
#![feature(ptr_internals)]
#![feature(asm)]
#![no_std]

extern crate spin;
extern crate volatile;
extern crate rlibc;

#[macro_use]
mod vga;

mod context;
mod keyboard;

use context::CONTEXT;
use vga::{Color, ColorCode};

#[allow(dead_code)]
mod cpuio;

//TODO implement ACPI to have such functionality 
/// Reboot the kernel
///
/// If reboot failed, will loop on a halt cmd
///
#[allow(dead_code)]
fn reboot()  {
    //TODO disable interrupt here something like : asm volatile ("cli");

    // I will now clear the keyboard buffer
    let mut buffer: u8 = 0x02;
    while buffer == 0x02 {
        buffer = cpuio::inb(0x64);
    }
    cpuio::outb(0x64, 0xFE);//Send reset value to CPU //TODO doesn't work
    println!("Reicv reboot command. System cannot reboot yet, he is now halt\n");
    cpuio::halt();
}

/// Shutdown the kernel
///
/// # Pre-requist:
/// Seems that he have to use following line command :
/// `-device isa-debug-exit,iobase=0xf4,iosize=0x04`
///
/// If shutdown failed, will loop on a halt cmd
///
#[allow(dead_code)]
fn shutdown() -> ! {
    cpuio::outb(0xf4, 0x00);//TODO doesn't work :(
    println!("Reicv shutdown command. System cannot shutdown properly yet, he is now halt\n");
    cpuio::halt();
}

#[no_mangle]
pub extern fn kmain() -> ! {
    unsafe { CONTEXT.current_term().color_code = ColorCode::new(Color::White, Color::Cyan); }
    print!("{}{}{}{}{}{}{}{}{}{}{}{}{}{}",
    format_args!("{: ^80}", r#"        ,--,               "#),
    format_args!("{: ^80}", r#"      ,--.'|      ,----,   "#),
    format_args!("{: ^80}", r#"   ,--,  | :    .'   .' \  "#),
    format_args!("{: ^80}", r#",---.'|  : '  ,----,'    | "#),
    format_args!("{: ^80}", r#";   : |  | ;  |    :  .  ; "#),
    format_args!("{: ^80}", r#"|   | : _' |  ;    |.'  /  "#),
    format_args!("{: ^80}", r#":   : |.'  |  `----'/  ;   "#),
    format_args!("{: ^80}", r#"|   ' '  ; :    /  ;  /    "#),
    format_args!("{: ^80}", r#"\   \  .'. |   ;  /  /-,   "#),
    format_args!("{: ^80}", r#" `---`:  | '  /  /  /.`|   "#),
    format_args!("{: ^80}", r#"      '  ; |./__;      :   "#),
    format_args!("{: ^80}", r#"      |  : ;|   :    .'    "#),
    format_args!("{: ^80}", r#"      '  ,/ ;   | .'       "#),
    format_args!("{: ^80}", r#"      '--'  `---'          "#));
    unsafe { CONTEXT.current_term().color_code = ColorCode::new(Color::White, Color::Black); }
    print!(">");

    loop {
        keyboard::kbd_callback();
    }
}

#[lang = "eh_personality"] #[no_mangle]
pub extern fn eh_personality() {

}

#[lang = "panic_fmt"] #[no_mangle]
pub extern fn panic_fmt(
    fmt: core::fmt::Arguments, file: &'static str, line: u32
    )
-> ! {
    println!("PANIC: {}", fmt);
    println!("FILE: {}", file);
    println!("LINE: {}", line);
    loop {}

}