//! AbleOS Kernel Entrypoint

// use crate::arch::sloop;
use {
    crate::{
        arch::logging::SERIAL_CONSOLE,
        bootmodules::{build_cmd, BootModules},
        device_tree::DeviceTree,
    },
    alloc::format,
    log::{debug, info, trace},
    spin::{Lazy, Mutex},
    xml::XMLElement,
};

pub fn kmain(cmdline: &str, boot_modules: BootModules) -> ! {
    debug!("Entered kmain");

    let kcmd = build_cmd("Kernel Command Line", &cmdline);
    trace!("Cmdline: {kcmd:?}");

    for (i, bm) in boot_modules.iter().enumerate() {
        let name = format!("module-{}", i);
        let _bmcmd: XMLElement;
        if bm.cmd.len() >= 2 {
            // TODO: pass into the program
            _bmcmd = build_cmd(name, bm.cmd.clone());
        }
    }

    let dt = DEVICE_TREE.lock();

    info!("Device Tree{}", dt);
    info!("Boot complete. Moving to init_system");

    // TODO: schedule the disk driver from the initramfs
    // TODO: schedule the filesystem driver from the initramfs
    // TODO: schedule the init system from the initramfs

    // TODO: change this to a driver
    {
        let mut prog = alloc::vec![];
        let mut code = alloc::string::String::new();

        let mut sc = SERIAL_CONSOLE.lock();
        loop {
            match sc.receive() {
                b'\r' => {
                    code.push('\n');

                    sc.send(b'\r');
                    sc.send(b'\n');

                    match hbasm::assembly(&code, &mut prog) {
                        Ok(_) => {
                            use hbvm::validate::validate;
                            match validate(&prog) {
                                Err(_e) => {
                                    // log::error!("Program validation error: {e:?}");
                                }
                                Ok(_) => {
                                    // log::info!("valid program");
                                    use {crate::host::TrapHandler, hbvm::vm::Vm};
                                    let mut vm;
                                    unsafe {
                                        vm = Vm::new_unchecked(&prog, TrapHandler);
                                        vm.memory.insert_test_page();
                                    }
                                    // log::info!("Program interrupt: {:?}", vm.run());
                                    // log::debug!("{:?}", vm.registers);
                                }
                            }

                            sc.send(b'>');
                        }
                        Err(_e) => {
                            // log::error!(
                            // "Error {:?} at {:?} (`{}`)",
                            // e.kind,
                            // e.span.clone(),
                            // &code[e.span],
                            // );
                            for x in "err".as_bytes() {
                                sc.send(*x);
                            }
                        }
                    }
                    code = alloc::string::String::new();
                }
                byte => {
                    code.push(byte as char);

                    sc.send(byte);
                }
            }
        }
    }

    // sloop();
}

pub static DEVICE_TREE: Lazy<Mutex<DeviceTree>> = Lazy::new(|| {
    let dt = DeviceTree::new();
    Mutex::new(dt)
});

#[test_case]
fn trivial_assertion() {
    trace!("trivial assertion... ");
    assert_eq!(1, 1);
    info!("[ok]");
}