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#![allow(non_camel_case_types, non_snake_case)]

use std::mem::ManuallyDrop;
use std::sync::atomic::AtomicU32;

use crate::co;
use crate::decl::*;
use crate::kernel::ffi_types::*;
use crate::ole::privs::*;
use crate::prelude::*;
use crate::vt::*;

/// [`IDropTarget`](crate::IDropTarget) virtual table.
#[repr(C)]
pub struct IDropTargetVT {
	pub IUnknownVT: IUnknownVT,
	pub DragEnter: fn(COMPTR, COMPTR, u32, u64, *mut u32) -> HRES,
	pub DragOver: fn(COMPTR, u32, u64, *mut u32) -> HRES,
	pub DragLeave: fn(COMPTR) -> HRES,
	pub Drop: fn(COMPTR, COMPTR, u32, u64, *mut u32) -> HRES,
}

//------------------------------------------------------------------------------

#[repr(C)]
pub struct IDropTargetImpl {
	vt: IDropTargetVT,
	counter: AtomicU32,
	DragEnter: Option<Box<dyn Fn(&IDataObject, co::MK, POINT, co::DROPEFFECT) -> HrResult<co::DROPEFFECT>>>,
	DragOver: Option<Box<dyn Fn(co::MK, POINT, co::DROPEFFECT) -> HrResult<co::DROPEFFECT>>>,
	DragLeave: Option<Box<dyn Fn() -> HrResult<()>>>,
	Drop: Option<Box<dyn Fn(&IDataObject, co::MK, POINT, co::DROPEFFECT) -> HrResult<co::DROPEFFECT>>>,
}

impl IDropTargetImpl {
	const fn new() -> Self {
		Self {
			vt: IDropTargetVT {
				IUnknownVT: IUnknownVT {
					QueryInterface: Self::QueryInterface,
					AddRef: Self::AddRef,
					Release: Self::Release,
				},
				DragEnter: Self::DragEnter,
				DragOver: Self::DragOver,
				DragLeave: Self::DragLeave,
				Drop: Self::Drop,
			},
			counter: AtomicU32::new(1),
			DragEnter: None,
			DragOver: None,
			DragLeave: None,
			Drop: None,
		}
	}

	com_interface_custom_iunknown_methods!(Self);

	fn DragEnter(
		p: COMPTR,
		pDataObj: COMPTR,
		grfKeyState: u32,
		pt: u64,
		pdwEffect: *mut u32,
	) -> HRES
	{
		let box_impl = box_impl::<Self>(p);
		let ret = match &box_impl.DragEnter {
			Some(func) => {
				let dob = ManuallyDrop::new(unsafe { IDataObject::from_ptr(pDataObj) });
				let mk = unsafe { co::MK::from_raw(grfKeyState as _) };
				let pt = POINT::new(LODWORD(pt) as _, HIDWORD(pt) as _);
				let dfx = unsafe { co::DROPEFFECT::from_raw(*pdwEffect) };
				func(&dob, mk, pt, dfx)
			},
			None => Ok(co::DROPEFFECT::NONE),
		};
		match ret {
			Ok(ret) => {
				unsafe { *pdwEffect = ret.raw(); }
				co::HRESULT::S_OK.raw()
			},
			Err(e) => e.raw(),
		}
	}

	fn DragOver(
		p: COMPTR,
		grfKeyState: u32,
		pt: u64,
		pdwEffect: *mut u32,
	) -> HRES
	{
		let box_impl = box_impl::<Self>(p);
		let ret = match &box_impl.DragOver {
			Some(func) => {
				let mk = unsafe { co::MK::from_raw(grfKeyState as _) };
				let pt = POINT::new(LODWORD(pt) as _, HIDWORD(pt) as _);
				let dfx = unsafe { co::DROPEFFECT::from_raw(*pdwEffect) };
				func(mk, pt, dfx)
			},
			None => Ok(co::DROPEFFECT::NONE),
		};
		match ret {
			Ok(ret) => {
				unsafe { *pdwEffect = ret.raw(); }
				co::HRESULT::S_OK.raw()
			},
			Err(e) => e.raw(),
		}
	}

	fn DragLeave(p: COMPTR) -> HRES {
		let box_impl = box_impl::<Self>(p);
		hrresult_to_hres(
			&match &box_impl.DragLeave {
				Some(func) => func(),
				None => Ok(()),
			},
		)
	}

	fn Drop(
		p: COMPTR,
		pDataObj: COMPTR,
		grfKeyState: u32,
		pt: u64,
		pdwEffect: *mut u32,
	) -> HRES
	{
		let box_impl = box_impl::<Self>(p);
		let ret = match &box_impl.Drop {
			Some(func) => {
				let dob = ManuallyDrop::new(unsafe { IDataObject::from_ptr(pDataObj) });
				let mk = unsafe { co::MK::from_raw(grfKeyState as _) };
				let pt = POINT::new(LODWORD(pt) as _, HIDWORD(pt) as _);
				let dfx = unsafe { co::DROPEFFECT::from_raw(*pdwEffect) };
				func(&dob, mk, pt, dfx)
			},
			None => Ok(co::DROPEFFECT::NONE),
		};
		match ret {
			Ok(ret) => {
				unsafe { *pdwEffect = ret.raw(); }
				co::HRESULT::S_OK.raw()
			},
			Err(e) => e.raw(),
		}
	}
}

//------------------------------------------------------------------------------

com_interface_custom! { IDropTarget, IDropTargetImpl: "00000122-0000-0000-c000-000000000046";
	/// [`IDropTarget`](https://learn.microsoft.com/en-us/windows/win32/api/oleidl/nn-oleidl-idroptarget)
	/// COM interface over [`IDropTargetVT`](crate::vt::IDropTargetVT).
	///
	/// Automatically calls
	/// [`Release`](https://learn.microsoft.com/en-us/windows/win32/api/unknwn/nf-unknwn-iunknown-release)
	/// when the object goes out of scope.
}

impl IDropTarget {
	fn_com_closure! { DragEnter: Fn(&IDataObject, co::MK, POINT, co::DROPEFFECT) -> HrResult<co::DROPEFFECT>;
		/// [`IDropTarget::DragEnter`](https://learn.microsoft.com/en-us/windows/win32/api/oleidl/nf-oleidl-idroptarget-dragenter)
		/// method.
	}

	fn_com_closure! { DragLeave: Fn() -> HrResult<()>;
		/// [`IDropTarget::DragLeave`](https://learn.microsoft.com/en-us/windows/win32/api/oleidl/nf-oleidl-idroptarget-dragleave)
		/// method.
	}

	fn_com_closure! { DragOver: Fn(co::MK, POINT, co::DROPEFFECT) -> HrResult<co::DROPEFFECT>;
		/// [`IDropTarget::DragOver`](https://learn.microsoft.com/en-us/windows/win32/api/oleidl/nf-oleidl-idroptarget-dragover)
		/// method.
	}

	fn_com_closure! { Drop: Fn(&IDataObject, co::MK, POINT, co::DROPEFFECT) -> HrResult<co::DROPEFFECT>;
		/// [`IDropTarget::Drop`](https://learn.microsoft.com/en-us/windows/win32/api/oleidl/nf-oleidl-idroptarget-drop)
		/// method.
	}
}