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#![allow(non_camel_case_types, non_snake_case)]

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

/// [`IEnumFilters`](crate::IEnumFilters) virtual table.
#[repr(C)]
pub struct IEnumFiltersVT {
	pub IUnknownVT: IUnknownVT,
	pub Next: fn(COMPTR, u32, *mut COMPTR, *mut u32) -> HRES,
	pub Skip: fn(COMPTR, u32) -> HRES,
	pub Reset: fn(COMPTR) -> HRES,
	pub Clone: fn(COMPTR, *mut COMPTR) -> HRES,
}

com_interface! { IEnumFilters: "56a86893-0ad4-11ce-b03a-0020af0ba770";
	/// [`IEnumFilters`](https://learn.microsoft.com/en-us/windows/win32/api/strmif/nn-strmif-ienumfilters)
	/// COM interface over [`IEnumFiltersVT`](crate::vt::IEnumFiltersVT).
	///
	/// Automatically calls
	/// [`IUnknown::Release`](https://learn.microsoft.com/en-us/windows/win32/api/unknwn/nf-unknwn-iunknown-release)
	/// when the object goes out of scope.
}

impl dshow_IEnumFilters for IEnumFilters {}

/// This trait is enabled with the `dshow` feature, and provides methods for
/// [`IEnumFilters`](crate::IEnumFilters).
///
/// Prefer importing this trait through the prelude:
///
/// ```no_run
/// use winsafe::prelude::*;
/// ```
pub trait dshow_IEnumFilters: ole_IUnknown {
	/// Returns an iterator over the [`IBaseFilter`](crate::IBaseFilter)
	/// elements which calls
	/// [`IEnumFilters::Next`](crate::prelude::dshow_IEnumFilters::Next)
	/// internally.
	///
	/// # Examples
	///
	/// ```no_run
	/// use winsafe::{self as w, prelude::*};
	///
	/// let filters: w::IEnumFilters; // initialized somewhere
	/// # let filters = unsafe { w::IEnumFilters::null() };
	///
	/// for filter in filters.iter() {
	///     let filter = filter?;
	///     // ...
	/// }
	/// # w::HrResult::Ok(())
	/// ```
	#[must_use]
	fn iter(&self) -> impl Iterator<Item = HrResult<IBaseFilter>> + '_ {
		IenumfiltersIter::new(self)
	}

	/// [`IEnumFilters::Next`](https://learn.microsoft.com/en-us/windows/win32/api/strmif/nf-strmif-ienumfilters-next)
	/// method.
	///
	/// Prefer using
	/// [`IEnumFilters::iter`](crate::prelude::dshow_IEnumFilters::iter), which
	/// is simpler.
	#[must_use]
	fn Next(&self) -> HrResult<Option<IBaseFilter>> {
		let mut queried = unsafe { IBaseFilter::null() };
		let mut fetched = u32::default();

		match ok_to_hrresult(
			unsafe {
				(vt::<IEnumFiltersVT>(self).Next)(
					self.ptr(),
					1, // retrieve only 1
					queried.as_mut(),
					&mut fetched,
				)
			},
		) {
			Ok(_) => Ok(Some(queried)),
			Err(hr) => match hr {
				co::HRESULT::S_FALSE => Ok(None), // no filter found
				hr => Err(hr), // actual error
			},
		}
	}

	fn_com_noparm! { Reset: IEnumFiltersVT;
		/// [`IEnumFilters::Reset`](https://learn.microsoft.com/en-us/windows/win32/api/strmif/nf-strmif-ienumfilters-reset)
		/// method.
	}

	/// [`IEnumFilters::Skip`](https://learn.microsoft.com/en-us/windows/win32/api/strmif/nf-strmif-ienumfilters-skip)
	/// method.
	fn Skip(&self, count: u32) -> HrResult<bool> {
		okfalse_to_hrresult(
			unsafe { (vt::<IEnumFiltersVT>(self).Skip)(self.ptr(), count) },
		)
	}
}