main.rs

#![no_std]
#![no_main]

use core::panic::PanicInfo;
use mac_types::{EventRecord, Rect, Point, Str255, EVERY_EVENT, NULL_EVENT, MOUSE_DOWN, KEY_DOWN};
use os::memory_mgr::{init_zone, new_handle, dispose_handle};

// Mock External Functions (Toolbox)
// In a real implementation, these would be linked to the actual C/Asm implementation
// or rewritten in Rust. For now, we stub them.

extern "C" {
    fn InitGraf(ptr: *mut u8);
    fn InitFonts();
    fn InitWindows();
    fn InitMenus();
    fn TEInit();
    fn InitDialogs(ptr: *mut u8);
    fn InitCursor();
    fn MaxApplZone();
}

#[no_mangle]
#[allow(non_snake_case)]
pub unsafe extern "C" fn FillRect(_rect: *const Rect, _pattern: *const u8) {
    // Hardware specific implementation
}

#[no_mangle]
#[allow(non_snake_case)]
pub unsafe extern "C" fn SetRect(rect: *mut Rect, left: i16, top: i16, right: i16, bottom: i16) {
    if rect.is_null() { return; }
    (*rect).left = left;
    (*rect).top = top;
    (*rect).right = right;
    (*rect).bottom = bottom;
}

#[no_mangle]
#[allow(non_snake_case)]
pub unsafe extern "C" fn NewWindow(_w_storage: *mut u8, _bounds_rect: *const Rect, _title: *const Str255, _visible: u8, _proc_id: i16, _behind: *mut u8, _go_away_flag: u8, _ref_con: i32) -> *mut u8 {
    // Return a dummy pointer
    0xDEADBEEF as *mut u8
}

#[no_mangle]
#[allow(non_snake_case)]
pub unsafe extern "C" fn WaitNextEvent(_event_mask: u16, the_event: *mut EventRecord, _sleep: u32, _mouse_rgn: *mut u8) -> u8 {
    // Simulation: just return false for now, or true with a null event
    if !the_event.is_null() {
        (*the_event).what = NULL_EVENT;
    }
    0
}

#[no_mangle]
#[allow(non_snake_case)]
pub unsafe extern "C" fn ExitToShell() -> ! {
    loop {}
}

#[no_mangle]
pub extern "C" fn _start() -> ! {
    main();
    loop {}
}

fn main() {
    let mut _my_event = EventRecord {
        what: 0,
        message: 0,
        when: 0,
        where_: Point { v: 0, h: 0 },
        modifiers: 0,
    };
    let mut bounds = Rect::default();

    // Initialize Memory Manager (Stubbed)
    unsafe {
        // Assume some memory range 0x10000 to 0x20000 is available for the heap
        let heap_start = 0x10000 as *mut u8;
        let heap_end = 0x20000 as *mut u8;
        let _ = init_zone(heap_start, heap_end);

        let _h = new_handle(1024);
        dispose_handle(_h);
    }

    // In a real pure Rust OS, we would initialize our own subsystems here.
    // For now, we stub the calls to show where they would go.

    // unsafe {
    //     InitGraf(core::ptr::null_mut()); // Stub
    //     InitFonts();
    //     InitWindows();
    //     InitMenus();
    //     TEInit();
    //     InitDialogs(core::ptr::null_mut());
    //     InitCursor();
    //     MaxApplZone();
    // }

    unsafe {
        // Draw Desktop
        FillRect(&bounds, core::ptr::null()); // Mock

        // Create a dummy window to show it's alive
        SetRect(&mut bounds, 50, 50, 400, 200);
        let title = Str255::from_str("System 7.1 Rust");
        NewWindow(core::ptr::null_mut(), &bounds, &title, 1, 0, core::ptr::null_mut(), 1, 0);

        // Main Event Loop
        loop {
            if WaitNextEvent(EVERY_EVENT, &mut _my_event, 60, core::ptr::null_mut()) != 0 {
                match _my_event.what {
                    MOUSE_DOWN => {
                        // Handle clicks
                    }
                    KEY_DOWN => {
                         // Handle keys
                         // if (_my_event.message & 0xFF) == 'q' as u32 {
                         //    ExitToShell();
                         // }
                    }
                    _ => {}
                }
            }
        }
    }
}

#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
    loop {}
}