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use core::mem::transmute;
use core::slice;

use cstr_core::CStr;
use ndless_sys::_show_msgbox;

use crate::cstr;
use crate::prelude::*;

#[repr(u32)]
#[derive(Debug)]
pub enum Button {
	ONE = 1,
	TWO = 2,
	THREE = 3,
}

pub fn msg(title: impl Into<String>, msg: impl Into<String>) {
	let title = cstr!(title.into());
	let msg = cstr!(msg.into());
	unsafe {
		_show_msgbox(title.as_ptr(), msg.as_ptr(), 0);
	}
}

pub fn msg_2b(
	title: impl Into<String>,
	msg: impl Into<String>,
	btn1: impl Into<String>,
	btn2: impl Into<String>,
) -> Button {
	let title = cstr!(title.into());
	let msg = cstr!(msg.into());
	let btn1 = cstr!(btn1.into());
	let btn2 = cstr!(btn2.into());
	unsafe {
		transmute(_show_msgbox(
			title.as_ptr(),
			msg.as_ptr(),
			2,
			btn1.as_ptr(),
			btn2.as_ptr(),
		))
	}
}

pub fn msg_3b(
	title: impl Into<String>,
	msg: impl Into<String>,
	btn1: impl Into<String>,
	btn2: impl Into<String>,
	btn3: impl Into<String>,
) -> Button {
	let title = cstr!(title.into());
	let msg = cstr!(msg.into());
	let btn1 = cstr!(btn1.into());
	let btn2 = cstr!(btn2.into());
	let btn3 = cstr!(btn3.into());
	unsafe {
		transmute(_show_msgbox(
			title.as_ptr(),
			msg.as_ptr(),
			3,
			btn1.as_ptr(),
			btn2.as_ptr(),
			btn3.as_ptr(),
		))
	}
}

pub fn msg_numeric(
	title: impl Into<String>,
	subtitle: impl Into<String>,
	msg: impl Into<String>,
	min: i32,
	max: i32,
) -> Option<i32> {
	let title = cstr!(title.into());
	let subtitle = cstr!(subtitle.into());
	let msg = cstr!(msg.into());
	let mut num = 0i32;
	match unsafe {
		ndless_sys::show_1numeric_input(
			title.as_ptr(),
			subtitle.as_ptr(),
			msg.as_ptr(),
			&mut num,
			min,
			max,
		)
	} {
		1 => Some(num),
		_ => None
	}
}

pub fn msg_2numeric(
	title: impl Into<String>,
	subtitle: impl Into<String>,
	msg1: impl Into<String>,
	min1: i32,
	max1: i32,
	msg2: impl Into<String>,
	min2: i32,
	max2: i32,
) -> Option<(i32, i32)> {
	let title = cstr!(title.into());
	let subtitle = cstr!(subtitle.into());
	let msg1 = cstr!(msg1.into());
	let msg2 = cstr!(msg2.into());
	let mut num1 = 0i32;
	let mut num2 = 0i32;
	match unsafe {
		ndless_sys::show_2numeric_input(
			title.as_ptr(),
			subtitle.as_ptr(),
			msg1.as_ptr(),
			&mut num1,
			min1,
			max1,
			msg2.as_ptr(),
			&mut num2,
			min2,
			max2,
		)
	} {
		1 => Some((num1, num2)),
		_ => None
	}
}

pub fn msg_input(title: impl Into<String>, msg: impl Into<String>, default: impl Into<String>) -> Option<String> {
	let title = cstr!(title.into());
	let msg = cstr!(msg.into());
	let default = cstr!(default.into());
	let mut ptr: *mut cty::c_char = core::ptr::null_mut();
	match unsafe {
		ndless_sys::show_msg_user_input(title.as_ptr(), msg.as_ptr(), default.as_ptr(), &mut ptr)
	} {
		-1 => None,
		len => unsafe {
			Some(CStr::from_bytes_with_nul_unchecked(
				slice::from_raw_parts(ptr as *const u8, len as usize + 1))
				.to_string_lossy()
				.into_owned()
			)
		}
	}
}