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use std::ptr;

use glib::{object::IsA, translate::*};

pub use crate::auto::functions::*;
use crate::{ffi, GLContext, GLDisplay};

/// ## `element`
/// a [`gst::Element`][crate::gst::Element]
/// ## `query`
/// a [`gst::Query`][crate::gst::Query] of type `GST_QUERY_CONTEXT`
/// ## `display`
/// a [`GLDisplay`][crate::GLDisplay]
/// ## `context`
/// a [`GLContext`][crate::GLContext]
/// ## `other_context`
/// application provided [`GLContext`][crate::GLContext]
///
/// # Returns
///
/// Whether the `query` was successfully responded to from the passed
///  `display`, `context`, and `other_context`.
#[doc(alias = "gst_gl_handle_context_query")]
pub fn gl_handle_context_query(
    element: &impl IsA<gst::Element>,
    query: &mut gst::query::Context,
    display: Option<&impl IsA<GLDisplay>>,
    context: Option<&impl IsA<GLContext>>,
    other_context: Option<&impl IsA<GLContext>>,
) -> bool {
    skip_assert_initialized!();
    unsafe {
        from_glib(ffi::gst_gl_handle_context_query(
            element.as_ref().to_glib_none().0,
            query.as_mut_ptr(),
            display.map(|p| p.as_ref()).to_glib_none().0,
            context.map(|p| p.as_ref()).to_glib_none().0,
            other_context.map(|p| p.as_ref()).to_glib_none().0,
        ))
    }
}

/// Helper function for implementing `GstElementClass.set_context()` in
/// OpenGL capable elements.
///
/// Retrieve's the [`GLDisplay`][crate::GLDisplay] or [`GLContext`][crate::GLContext] in `context` and places the
/// result in `display` or `other_context` respectively.
/// ## `element`
/// a [`gst::Element`][crate::gst::Element]
/// ## `context`
/// a [`gst::Context`][crate::gst::Context]
///
/// # Returns
///
/// whether the `display` or `other_context` could be set successfully
///
/// ## `display`
/// location of a [`GLDisplay`][crate::GLDisplay]
///
/// ## `other_context`
/// location of a [`GLContext`][crate::GLContext]
#[doc(alias = "gst_gl_handle_set_context")]
pub fn gl_handle_set_context(
    element: &impl IsA<gst::Element>,
    context: &gst::Context,
) -> (Option<GLDisplay>, Option<GLContext>) {
    skip_assert_initialized!();
    unsafe {
        let mut display = ptr::null_mut();
        let mut other_context = ptr::null_mut();
        let ret = from_glib(ffi::gst_gl_handle_set_context(
            element.as_ref().to_glib_none().0,
            context.to_glib_none().0,
            &mut display,
            &mut other_context,
        ));
        if ret {
            (from_glib_full(display), from_glib_full(other_context))
        } else {
            (None, None)
        }
    }
}

/// Given `swizzle`, produce `inversion` such that:
///
/// `swizzle`[`inversion`[i]] == identity[i] where:
/// - identity = {0, 1, 2,...}
/// - unset fields are marked by -1
/// ## `swizzle`
/// input swizzle
///
/// # Returns
///
///
/// ## `inversion`
/// resulting inversion
#[cfg(feature = "v1_24")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
#[doc(alias = "gst_gl_swizzle_invert")]
pub fn gl_swizzle_invert(swizzle: [i32; 4]) -> [i32; 4] {
    unsafe {
        use std::mem;

        let mut inversion = mem::MaybeUninit::uninit();
        ffi::gst_gl_swizzle_invert(
            mut_override(swizzle.as_ptr() as *const _),
            inversion.as_mut_ptr(),
        );
        inversion.assume_init()
    }
}

/// Calculates the swizzle indices for `video_format` and `gl_format` in order to
/// access a texture such that accessing a texel from a texture through the swizzle
/// index produces values in the order (R, G, B, A) or (Y, U, V, A).
///
/// For multi-planer formats, the swizzle index uses the same component order (RGBA/YUVA)
/// and should be applied after combining multiple planes into a single rgba/yuva value.
/// e.g. sampling from a NV12 format would have Y from one texture and UV from
/// another texture into a (Y, U, V) value. Add an Aplha component and then
/// perform swizzling. Sampling from NV21 would produce (Y, V, U) which is then
/// swizzled to (Y, U, V).
/// ## `video_format`
/// the `GstVideoFormat` in use
///
/// # Returns
///
/// whether valid swizzle indices could be found
///
/// ## `swizzle`
/// the returned swizzle indices
#[cfg(feature = "v1_24")]
#[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
#[doc(alias = "gst_gl_video_format_swizzle")]
pub fn gl_video_format_swizzle(video_format: gst_video::VideoFormat) -> Option<[i32; 4]> {
    unsafe {
        use std::mem;

        let mut swizzle = mem::MaybeUninit::uninit();
        let res = from_glib(ffi::gst_gl_video_format_swizzle(
            video_format.into_glib(),
            swizzle.as_mut_ptr(),
        ));
        if res {
            Some(swizzle.assume_init())
        } else {
            None
        }
    }
}