// Copyright (c) 2018 Colin Finck, RWTH Aachen University
//                    Stefan Lankes, RWTH Aachen University
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.

use crate::drivers::net::*;
use crate::environment;
#[cfg(feature = "newlib")]
use crate::synch::spinlock::SpinlockIrqSave;
use crate::syscalls::interfaces::SyscallInterface;
#[cfg(not(test))]
use crate::{__sys_free, __sys_malloc, __sys_realloc};

pub use self::condvar::*;
pub use self::processor::*;
pub use self::random::*;
pub use self::recmutex::*;
pub use self::semaphore::*;
pub use self::spinlock::*;
pub use self::system::*;
pub use self::tasks::*;
pub use self::timer::*;

mod condvar;
pub mod fs;
mod interfaces;
#[cfg(feature = "newlib")]
mod lwip;
mod processor;
mod random;
mod recmutex;
mod semaphore;
mod spinlock;
mod system;
mod tasks;
mod timer;

#[cfg(feature = "newlib")]
const LWIP_FD_BIT: i32 = 1 << 30;

#[cfg(feature = "newlib")]
pub static LWIP_LOCK: SpinlockIrqSave<()> = SpinlockIrqSave::new(());

static mut SYS: &'static dyn SyscallInterface = &interfaces::Generic;

pub fn init() {
	unsafe {
		// We know that HermitCore has successfully initialized a network interface.
		// Now check if we can load a more specific SyscallInterface to make use of networking.
		if environment::is_proxy() {
			panic!("Currently, we don't support the proxy mode!");
		} else if environment::is_uhyve() {
			SYS = &interfaces::Uhyve;
		}

		// Perform interface-specific initialization steps.
		SYS.init();
	}

	random_init();
	#[cfg(feature = "newlib")]
	sbrk_init();
}

#[cfg(not(test))]
#[no_mangle]
pub extern "C" fn sys_malloc(size: usize, align: usize) -> *mut u8 {
	__sys_malloc(size, align)
}

#[cfg(not(test))]
#[no_mangle]
pub extern "C" fn sys_realloc(ptr: *mut u8, size: usize, align: usize, new_size: usize) -> *mut u8 {
	unsafe { __sys_realloc(ptr, size, align, new_size) }
}

#[cfg(not(test))]
#[no_mangle]
pub extern "C" fn sys_free(ptr: *mut u8, size: usize, align: usize) {
	unsafe { __sys_free(ptr, size, align) }
}

pub fn get_application_parameters() -> (i32, *const *const u8, *const *const u8) {
	unsafe { SYS.get_application_parameters() }
}

fn __sys_get_mac_address() -> Result<[u8; 6], ()> {
	unsafe { SYS.get_mac_address() }
}

#[no_mangle]
pub fn sys_get_mac_address() -> Result<[u8; 6], ()> {
	kernel_function!(__sys_get_mac_address())
}

fn __sys_get_mtu() -> Result<u16, ()> {
	unsafe { SYS.get_mtu() }
}

#[no_mangle]
pub fn sys_get_mtu() -> Result<u16, ()> {
	kernel_function!(__sys_get_mtu())
}

fn __sys_get_tx_buffer(len: usize) -> Result<(*mut u8, usize), ()> {
	unsafe { SYS.get_tx_buffer(len) }
}

#[no_mangle]
pub fn sys_get_tx_buffer(len: usize) -> Result<(*mut u8, usize), ()> {
	kernel_function!(__sys_get_tx_buffer(len))
}

fn __sys_send_tx_buffer(handle: usize, len: usize) -> Result<(), ()> {
	unsafe { SYS.send_tx_buffer(handle, len) }
}

#[no_mangle]
pub fn sys_send_tx_buffer(handle: usize, len: usize) -> Result<(), ()> {
	kernel_function!(__sys_send_tx_buffer(handle, len))
}

fn __sys_receive_rx_buffer() -> Result<&'static [u8], ()> {
	unsafe { SYS.receive_rx_buffer() }
}

#[no_mangle]
pub fn sys_receive_rx_buffer() -> Result<&'static [u8], ()> {
	kernel_function!(__sys_receive_rx_buffer())
}

fn __sys_rx_buffer_consumed() -> Result<(), ()> {
	unsafe { SYS.rx_buffer_consumed() }
}

#[no_mangle]
pub fn sys_rx_buffer_consumed() -> Result<(), ()> {
	kernel_function!(__sys_rx_buffer_consumed())
}

#[cfg(not(feature = "newlib"))]
#[no_mangle]
pub fn sys_netwakeup() {
	kernel_function!(netwakeup());
}

pub fn __sys_netwait(millis: Option<u64>) {
	if !unsafe { SYS.has_packet() } {
		netwait(millis)
	}
}

#[cfg(not(feature = "newlib"))]
#[no_mangle]
pub fn sys_netwait(millis: Option<u64>) {
	kernel_function!(__sys_netwait(millis));
}

pub fn __sys_shutdown(arg: i32) -> ! {
	unsafe { SYS.shutdown(arg) }
}

#[no_mangle]
pub extern "C" fn sys_shutdown(arg: i32) -> ! {
	kernel_function!(__sys_shutdown(arg))
}

fn __sys_unlink(name: *const u8) -> i32 {
	unsafe { SYS.unlink(name) }
}

#[no_mangle]
pub extern "C" fn sys_unlink(name: *const u8) -> i32 {
	kernel_function!(__sys_unlink(name))
}

fn __sys_open(name: *const u8, flags: i32, mode: i32) -> i32 {
	unsafe { SYS.open(name, flags, mode) }
}

#[no_mangle]
pub extern "C" fn sys_open(name: *const u8, flags: i32, mode: i32) -> i32 {
	kernel_function!(__sys_open(name, flags, mode))
}

fn __sys_close(fd: i32) -> i32 {
	unsafe { SYS.close(fd) }
}

#[no_mangle]
pub extern "C" fn sys_close(fd: i32) -> i32 {
	kernel_function!(__sys_close(fd))
}

fn __sys_read(fd: i32, buf: *mut u8, len: usize) -> isize {
	unsafe { SYS.read(fd, buf, len) }
}
#[no_mangle]
pub extern "C" fn sys_read(fd: i32, buf: *mut u8, len: usize) -> isize {
	kernel_function!(__sys_read(fd, buf, len))
}

fn __sys_write(fd: i32, buf: *const u8, len: usize) -> isize {
	unsafe { SYS.write(fd, buf, len) }
}

#[no_mangle]
pub extern "C" fn sys_write(fd: i32, buf: *const u8, len: usize) -> isize {
	kernel_function!(__sys_write(fd, buf, len))
}

fn __sys_lseek(fd: i32, offset: isize, whence: i32) -> isize {
	unsafe { SYS.lseek(fd, offset, whence) }
}

#[no_mangle]
pub extern "C" fn sys_lseek(fd: i32, offset: isize, whence: i32) -> isize {
	kernel_function!(__sys_lseek(fd, offset, whence))
}

fn __sys_stat(file: *const u8, st: usize) -> i32 {
	unsafe { SYS.stat(file, st) }
}

#[no_mangle]
pub extern "C" fn sys_stat(file: *const u8, st: usize) -> i32 {
	kernel_function!(__sys_stat(file, st))
}