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use std::error;
use std::fmt;

use ffi::*;
use ::traits::Device;

/// OpenAL error type.
#[derive(Copy, Clone)]
pub enum Error {
	/// There is no current error.
	None,

	/// The device handle or specifier names an inaccessible driver/server.
	InvalidDevice,

	/// The Context argument does not name a valid context.
	InvalidContext,

	/// Invalid name parameter.
	InvalidName,

	/// Illegal call.
	InvalidOperation,

	/// Invalid parameter.
	InvalidEnum,

	/// Invalid enum parameter value.
	InvalidValue,

	/// Unable to allocate memory.
	OutOfMemory,
}

#[doc(hidden)]
#[derive(Copy, Clone)]
pub struct AL(pub ALenum);

#[doc(hidden)]
#[derive(Copy, Clone)]
pub struct ALC(pub ALCenum);

impl Error {
	/// Check if there was an error on the last operation.
	pub fn last() -> Option<Self> {
		unsafe {
			match Error::from(AL(alGetError())) {
				Error::None =>
					None,

				error =>
					Some(error)
			}
		}
	}

	/// Check if there was an error on the last operation of the given device.
	pub fn last_for<T: Device>(device: &T) -> Option<Self> {
		unsafe {
			match Error::from(ALC(alcGetError(device.as_ptr()))) {
				Error::None =>
					None,

				error =>
					Some(error)
			}
		}
	}
}

impl From<AL> for Error {
	fn from(value: AL) -> Error {
		match value.0 {
			AL_NO_ERROR          => Error::None,
			AL_INVALID_NAME      => Error::InvalidName,
			AL_INVALID_ENUM      => Error::InvalidEnum,
			AL_INVALID_VALUE     => Error::InvalidValue,
			AL_INVALID_OPERATION => Error::InvalidOperation,
			AL_OUT_OF_MEMORY     => Error::OutOfMemory,

			_ => Error::None,
		}
	}
}

impl From<ALC> for Error {
	fn from(value: ALC) -> Error {
		match value.0 {
			ALC_NO_ERROR        => Error::None,
			ALC_INVALID_CONTEXT => Error::InvalidContext,
			ALC_INVALID_DEVICE  => Error::InvalidDevice,
			ALC_INVALID_ENUM    => Error::InvalidEnum,
			ALC_INVALID_VALUE   => Error::InvalidValue,
			ALC_OUT_OF_MEMORY   => Error::OutOfMemory,

			_ => Error::None,
		}
	}
}

impl fmt::Display for Error {
	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
		f.write_str(error::Error::description(self))
	}
}

impl fmt::Debug for Error {
	fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
		try!(f.write_str("openal::Error("));
		try!(fmt::Display::fmt(self, f));
		f.write_str(")")
	}
}

impl error::Error for Error {
	fn description(&self) -> &str {
		match self {
			&Error::None =>
				"There is no current error.",

			&Error::InvalidDevice =>
				"The device handle or specifier names an inaccessible driver/server.",

			&Error::InvalidContext =>
				"The Context argument does not name a valid context.",

			&Error::InvalidEnum =>
				"Invalid parameter.",

			&Error::InvalidName =>
				"Invalid name parameter.",

			&Error::InvalidValue =>
				"Invalid enum parameter value.",

			&Error::InvalidOperation =>
				"Illegal call.",

			&Error::OutOfMemory =>
				"Unable to allocate memory.",
		}
	}
}