use core::{ffi::{CStr, VaList, c_char, c_int, c_long, c_longlong, c_size_t, c_uchar, c_void}, ptr::null_mut};

use alloc::__xkbc_malloc;
use inout::{FILE, STDERR, STDIN, STDOUT};
use log::info;

pub mod alloc;
pub mod string;
pub mod inout;
pub mod gcc_runtime;

#[allow(non_camel_case_types)]
pub type c_intmax_t = c_longlong;

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_imaxabs(j: c_intmax_t) -> c_intmax_t {
    todo!()
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_eaccess(pathname: *const c_char, mode: c_int ) -> c_int {
    todo!()
}

#[allow(non_camel_case_types)]
type stat = c_void; // Not implemented

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_stat(path: *const c_char, buf: *mut stat) -> c_int {
    todo!()
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc___errno() -> *mut c_int {
    todo!()
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_qsort(
    base: *mut c_void,
    num: c_size_t,
    size: c_size_t,
    compar: Option<unsafe extern "C" fn(*const c_void, *const c_void) -> c_int>,
) {
    todo!()
}

/// An incomplete representation of Newlib's `struct _reent`.
/// https://github.com/bminor/newlib/blob/b41e3b652c4215556a62a2f47e8f8f11553fa550/newlib/libc/include/sys/reent.h#L580
#[repr(C)]
#[allow(non_camel_case_types)]
#[derive(Clone, Copy)]
struct _reent {
    _errno: c_int,
    _stdin: *mut FILE,
    _stdout: *mut FILE,
    _stderr: *mut FILE,
    // Rest unimplemented
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc___getreent() -> *mut _reent {
    static mut REENT: [_reent; 2] = [_reent {
        _errno: 0,
        _stdin: STDIN,
        _stdout: STDOUT,
        _stderr: STDERR,
    }; 2];

    unsafe {
        let reent = &mut REENT[esp_hal::system::Cpu::current() as usize];
        reent as *mut _reent
    }
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_secure_getenv(name: *const c_char) -> *mut c_char {
    unsafe { __xkbc_getenv(name) }
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_getenv(name: *const c_char) -> *mut c_char {
    null_mut()
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_open(
    path: *const c_char,
    oflag: c_int,
    ...
) -> c_int {
    todo!()
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_fstat(fildes: c_int, buf: *mut stat) -> c_int {
    todo!()
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_close(fd: c_int) -> c_int {
    todo!()
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_fdopen(
    fd: c_int,
    mode: *const c_char,
) -> *mut FILE {
    todo!()
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_labs(i: c_long) -> c_long {
    i.abs()
}

unsafe extern "C" {
    fn __assert_func(file: *const c_char, line: c_int, function: *const c_char, failedExpression: *const c_char);
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc___assert_func(file: *const c_char, line: c_int, function: *const c_char, failed_expression: *const c_char) {
    unsafe { __assert_func(file, line, function, failed_expression); }
}

#[unsafe(no_mangle)]
pub unsafe extern "C" fn __xkbc_atoi(s: *const c_char) -> c_int {
    todo!()
}