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use std::io;
use sys;

pub(crate) const STRING_BUFFER_LENGTH: usize = 0x200;

pub(crate) fn convert_error(e: sys::Error) -> io::Error {
	match e {
		sys::Error::Sys(errno) => errno.into(),
		_ => sys::Errno::EINVAL.into(),
	}
}

macro_rules! impl_iterable {
	(@impliter $name: ident($start:expr, $count:expr)) => {
		impl ::bitmask::BitmaskTrait for $name {
			type Array = [u8; (Self::COUNT + 7) / 8];
			type Index = $name;
			const ZERO: Self::Array = [0u8; (Self::COUNT + 7) / 8];

			fn array_default() -> Self::Array { unsafe { ::std::mem::zeroed() } }
			fn array_slice(array: &Self::Array) -> &[u8] { array }
			fn array_slice_mut(array: &mut Self::Array) -> &mut [u8] { array }
			fn index(index: Self::Index) -> usize { index as usize }
		}

		impl ::enum_iterator::IterableEnum for $name {
			fn iter_next(v: usize) -> Option<(usize, Self)> {
				if v < Self::COUNT {
					unsafe {
						Some((v + 1, ::std::mem::transmute(v as u16)))
					}
				} else {
					None
				}
			}

			fn iter() -> ::enum_iterator::EnumIterator<Self> {
				::enum_iterator::EnumIterator::new($start)
			}
		}

		impl $name {
			/// The maximum valid value.
			pub const COUNT: usize = $count as usize;

			/// An iterator over all values of the enum.
			pub fn iter() -> ::enum_iterator::EnumIterator<Self> {
				::enum_iterator::IterableEnum::iter()
			}

			/// A bitmask that can contain all values of the enum.
			pub fn bitmask() -> ::bitmask::Bitmask<Self> {
				Default::default()
			}
		}

		impl From<$name> for u16 {
			fn from(v: $name) -> Self {
				v as _
			}
		}
	};
	(@implcode $name: ident($start:expr, $count:expr)) => {
		impl $name {
			/// Instantiates the enum from a raw code value.
			pub fn from_code(code: u16) -> Result<Self, ::kinds::RangeError> {
				use std::mem;

				if code < Self::COUNT as u16 {
					Ok(unsafe { mem::transmute(code) })
				} else {
					Err(::kinds::RangeError)
				}
			}
		}

		impl std::convert::TryFrom<u16> for $name {
			type Error = ::kinds::RangeError;

			fn try_from(code: u16) -> Result<Self, Self::Error> {
				Self::from_code(code)
			}
		}
	};
	($name: ident($start:expr, $count:expr)) => {
		impl_iterable! { @impliter $name($start, $count) }
		impl_iterable! { @implcode $name($start, $count) }
	};
	(@nofromcode $name: ident($start:expr, $count:expr)) => {
		impl_iterable! { @impliter $name($start, $count) }
	};
}

macro_rules! ioctl_impl {
	($(#[$attr:meta])* @get $f:ident = $ev:ident -> $ret:ty) => {
		$(#[$attr])*
		pub fn $f(&self) -> io::Result<$ret> {
			unsafe {
				let mut v = ::std::mem::MaybeUninit::uninit();
				sys::$ev(self.fd(), &mut *v.as_mut_ptr())
					.map(|_| v.assume_init().into())
					.map_err(::macros::convert_error)
			}
		}
	};
	($(#[$attr:meta])* @call $f:ident = $ev:ident) => {
		$(#[$attr])*
		pub fn $f(&self) -> io::Result<()> {
			unsafe {
				sys::$ev(self.fd())
					.map(drop)
					.map_err(::macros::convert_error)
			}
		}
	};
	($(#[$attr:meta])* @get_buf $f:ident($ty:ty) = $ev:ident) => {
		$(#[$attr])*
		pub fn $f(&self, buffer: &mut [$ty]) -> io::Result<usize> {
			unsafe {
				sys::$ev(self.fd(), &mut *(buffer as *mut [$ty] as *mut [_]))
					.map(|len| len as _)
					.map_err(::macros::convert_error)
			}
		}
	};
	($(#[$attr:meta])* @get_str $f:ident, $fbuf:ident = $ev:ident) => {
		ioctl_impl! {
			$(#[$attr])*
			@get_buf $fbuf(u8) = $ev
		}

		$(#[$attr])*
		pub fn $f(&self) -> io::Result<Vec<u8>> {
			let mut buf = vec![0; ::macros::STRING_BUFFER_LENGTH];
			self.$fbuf(&mut buf[..]).map(move |len| {
				buf.truncate(len as _);
				buf
			})
		}
	};
	($(#[$attr:meta])* @set_str $f:ident = $ev:ident) => {
		$(#[$attr])*
		pub fn $f(&self, value: &::std::ffi::CStr) -> io::Result<()> {
			unsafe {
				sys::$ev(self.fd(), value.as_ptr())
					.map(drop)
					.map_err(::macros::convert_error)
			}
		}
	};
	($(#[$attr:meta])* @set $f:ident($in:ty) = $ev:ident) => {
		$(#[$attr])*
		pub fn $f(&self, value: $in) -> io::Result<()> {
			unsafe {
				sys::$ev(self.fd(), value as _)
					.map(drop)
					.map_err(::macros::convert_error)
			}
		}
	};
	($({ $($tt:tt)* })*) => {
		$(
			ioctl_impl! {$($tt)*}
		)*
	};
}

macro_rules! impl_bitmasks {
	{ $kind:path, $event: expr, $name_mask:ident, $name_mask_set:ident, $name_bits:ident } => {
		/// `EVIOCGMASK`
		pub fn $name_mask(&self) -> io::Result<::bitmask::Bitmask<$kind>> {
			let mut bitmask = ::bitmask::Bitmask::default();
			self.event_mask_raw($event, &mut bitmask).map(|_| bitmask)
		}

		/// `EVIOCSMASK`
		pub fn $name_mask_set(&self, bitmask: &::bitmask::Bitmask<$kind>) -> io::Result<()> {
			self.set_event_mask_raw($event, bitmask)
		}

		/// `EVIOCGBIT`
		pub fn $name_bits(&self) -> io::Result<::bitmask::Bitmask<$kind>> {
			let mut bitmask = ::bitmask::Bitmask::default();
			self.event_bits_raw($event, &mut bitmask).map(|_| bitmask)
		}
	};
}