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/// An identifier mapping to a particular gamepad, used for querying state from [`crate::InputSystem`]
#[derive(Clone, Copy, Eq, PartialEq, Hash, Debug)]
pub struct GamePadId {
	id: gilrs::GamepadId,
}

impl From<gilrs::GamepadId> for GamePadId {
	fn from(id: gilrs::GamepadId) -> Self {
		Self { id }
	}
}

impl From<GamePadId> for gilrs::GamepadId {
	fn from(gpid: GamePadId) -> Self {
		gpid.id
	}
}

/// GamePad Button identifiers.
///
/// Assumes a layout similar to an Xbox controller, with the exception that
/// the A, B, X, and Y buttons have been renamed South, East, West, North respectively.
#[derive(Clone, Copy, Eq, PartialEq, Hash, Debug)]
pub enum GamePadButton {
	South,
	North,
	East,
	West,

	DPadUp,
	DPadDown,
	DPadLeft,
	DPadRight,

	LeftStick,
	RightStick,

	LeftShoulder,
	RightShoulder,

	LeftTrigger,
	RightTrigger,

	Start,
	Back,
}

impl std::convert::TryFrom<gilrs::Button> for GamePadButton {
	type Error = gilrs::Button;

	fn try_from(button: gilrs::Button) -> Result<Self, gilrs::Button> {
		Ok(match button {
			gilrs::Button::South => GamePadButton::South,
			gilrs::Button::North => GamePadButton::North,
			gilrs::Button::East => GamePadButton::East,
			gilrs::Button::West => GamePadButton::West,

			gilrs::Button::DPadUp => GamePadButton::DPadUp,
			gilrs::Button::DPadDown => GamePadButton::DPadDown,
			gilrs::Button::DPadLeft => GamePadButton::DPadLeft,
			gilrs::Button::DPadRight => GamePadButton::DPadRight,

			gilrs::Button::LeftThumb => GamePadButton::LeftStick,
			gilrs::Button::RightThumb => GamePadButton::RightStick,

			gilrs::Button::LeftTrigger => GamePadButton::LeftShoulder,
			gilrs::Button::RightTrigger => GamePadButton::RightShoulder,

			gilrs::Button::LeftTrigger2 => GamePadButton::LeftTrigger,
			gilrs::Button::RightTrigger2 => GamePadButton::RightTrigger,

			gilrs::Button::Start => GamePadButton::Start,
			gilrs::Button::Select => GamePadButton::Back,

			_ => return Err(button),
		})
	}
}

impl From<GamePadButton> for gilrs::Button {
	fn from(button: GamePadButton) -> Self {
		match button {
			GamePadButton::South => gilrs::Button::South,
			GamePadButton::North => gilrs::Button::North,
			GamePadButton::East => gilrs::Button::East,
			GamePadButton::West => gilrs::Button::West,
			GamePadButton::DPadUp => gilrs::Button::DPadUp,
			GamePadButton::DPadDown => gilrs::Button::DPadDown,
			GamePadButton::DPadLeft => gilrs::Button::DPadLeft,
			GamePadButton::DPadRight => gilrs::Button::DPadRight,
			GamePadButton::LeftStick => gilrs::Button::LeftThumb,
			GamePadButton::RightStick => gilrs::Button::RightThumb,
			GamePadButton::LeftShoulder => gilrs::Button::LeftTrigger,
			GamePadButton::RightShoulder => gilrs::Button::RightTrigger,
			GamePadButton::LeftTrigger => gilrs::Button::LeftTrigger2,
			GamePadButton::RightTrigger => gilrs::Button::RightTrigger2,
			GamePadButton::Start => gilrs::Button::Start,
			GamePadButton::Back => gilrs::Button::Select,
		}
	}
}

/// GamePad axis identifiers.
///
/// Does not include an axis mapping for the DPad, that is exposed via button presses.
#[derive(Clone, Copy, Eq, PartialEq, Hash, Debug)]
pub enum GamePadAxis {
	LeftStickX,
	LeftStickY,
	RightStickX,
	RightStickY,
}

impl std::convert::TryFrom<gilrs::Axis> for GamePadAxis {
	type Error = gilrs::Axis;

	fn try_from(axis: gilrs::Axis) -> Result<Self, gilrs::Axis> {
		Ok(match axis {
			gilrs::Axis::LeftStickX => GamePadAxis::LeftStickX,
			gilrs::Axis::LeftStickY => GamePadAxis::LeftStickY,
			gilrs::Axis::RightStickX => GamePadAxis::RightStickX,
			gilrs::Axis::RightStickY => GamePadAxis::RightStickY,
			_ => return Err(axis),
		})
	}
}