use objc2::encode::{Encode, Encoding};
use objc2::{extern_class, extern_methods, mutability, ClassType};
use objc2_foundation::{CGFloat, NSInteger, NSObject, NSUInteger};

// https://developer.apple.com/documentation/uikit/uigesturerecognizer
extern_class!(
    #[derive(Debug, PartialEq, Eq, Hash)]
    pub(crate) struct UIGestureRecognizer;

    unsafe impl ClassType for UIGestureRecognizer {
        type Super = NSObject;
        type Mutability = mutability::InteriorMutable;
    }
);

extern_methods!(
    unsafe impl UIGestureRecognizer {
        #[method(state)]
        pub fn state(&self) -> UIGestureRecognizerState;
    }
);

unsafe impl Encode for UIGestureRecognizer {
    const ENCODING: Encoding = Encoding::Object;
}

// https://developer.apple.com/documentation/uikit/uigesturerecognizer/state
#[repr(transparent)]
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub struct UIGestureRecognizerState(NSInteger);

unsafe impl Encode for UIGestureRecognizerState {
    const ENCODING: Encoding = NSInteger::ENCODING;
}

#[allow(dead_code)]
impl UIGestureRecognizerState {
    pub const Possible: Self = Self(0);
    pub const Began: Self = Self(1);
    pub const Changed: Self = Self(2);
    pub const Ended: Self = Self(3);
    pub const Cancelled: Self = Self(4);
    pub const Failed: Self = Self(5);
}

// https://developer.apple.com/documentation/uikit/uipinchgesturerecognizer
extern_class!(
    #[derive(Debug, PartialEq, Eq, Hash)]
    pub(crate) struct UIPinchGestureRecognizer;

    unsafe impl ClassType for UIPinchGestureRecognizer {
        type Super = UIGestureRecognizer;
        type Mutability = mutability::InteriorMutable;
    }
);

extern_methods!(
    unsafe impl UIPinchGestureRecognizer {
        #[method(scale)]
        pub fn scale(&self) -> CGFloat;

        #[method(velocity)]
        pub fn velocity(&self) -> CGFloat;
    }
);

unsafe impl Encode for UIPinchGestureRecognizer {
    const ENCODING: Encoding = Encoding::Object;
}

// https://developer.apple.com/documentation/uikit/uirotationgesturerecognizer
extern_class!(
    #[derive(Debug, PartialEq, Eq, Hash)]
    pub(crate) struct UIRotationGestureRecognizer;

    unsafe impl ClassType for UIRotationGestureRecognizer {
        type Super = UIGestureRecognizer;
        type Mutability = mutability::InteriorMutable;
    }
);

extern_methods!(
    unsafe impl UIRotationGestureRecognizer {
        #[method(rotation)]
        pub fn rotation(&self) -> CGFloat;

        #[method(velocity)]
        pub fn velocity(&self) -> CGFloat;
    }
);

unsafe impl Encode for UIRotationGestureRecognizer {
    const ENCODING: Encoding = Encoding::Object;
}

// https://developer.apple.com/documentation/uikit/uitapgesturerecognizer
extern_class!(
    #[derive(Debug, PartialEq, Eq, Hash)]
    pub(crate) struct UITapGestureRecognizer;

    unsafe impl ClassType for UITapGestureRecognizer {
        type Super = UIGestureRecognizer;
        type Mutability = mutability::InteriorMutable;
    }
);

extern_methods!(
    unsafe impl UITapGestureRecognizer {
        #[method(setNumberOfTapsRequired:)]
        pub fn setNumberOfTapsRequired(&self, number_of_taps_required: NSUInteger);

        #[method(setNumberOfTouchesRequired:)]
        pub fn setNumberOfTouchesRequired(&self, number_of_touches_required: NSUInteger);
    }
);

unsafe impl Encode for UITapGestureRecognizer {
    const ENCODING: Encoding = Encoding::Object;
}