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use crate::{ffi, GLContext, GLDisplay};

use glib::prelude::*;
use glib::translate::*;

mod sealed {
    pub trait Sealed {}
    impl<T: super::IsA<super::GLDisplay>> Sealed for T {}
}

pub trait GLDisplayExtManual: sealed::Sealed + IsA<GLDisplay> + 'static {
    ///
    /// # Returns
    ///
    /// the native handle for the display
    #[doc(alias = "gst_gl_display_get_handle")]
    #[doc(alias = "get_handle")]
    fn handle(&self) -> usize {
        unsafe { ffi::gst_gl_display_get_handle(self.as_ref().to_glib_none().0) }
    }

    /// Ensures that the display has a valid GL context for the current thread. If
    /// `context` already contains a valid context, this does nothing.
    /// ## `other_context`
    /// other [`GLContext`][crate::GLContext] to share resources with.
    /// ## `context`
    /// the resulting [`GLContext`][crate::GLContext]
    ///
    /// # Returns
    ///
    /// wether `context` contains a valid context.
    #[cfg(feature = "v1_24")]
    #[cfg_attr(docsrs, doc(cfg(feature = "v1_24")))]
    #[doc(alias = "gst_gl_display_ensure_context")]
    fn ensure_context(
        &self,
        other_context: Option<&impl IsA<GLContext>>,
        context: &mut Option<GLContext>,
    ) -> Result<(), glib::Error> {
        unsafe {
            let mut err = std::ptr::null_mut();
            let res = ffi::gst_gl_display_ensure_context(
                self.as_ref().to_glib_none().0,
                other_context.map(AsRef::as_ref).to_glib_none().0,
                context as *mut Option<GLContext> as *mut Option<*mut ffi::GstGLContext>
                    as *mut *mut ffi::GstGLContext,
                &mut err,
            );

            if res == glib::ffi::GFALSE {
                *context = None;
                Err(from_glib_full(err))
            } else {
                debug_assert!(err.is_null());
                Ok(())
            }
        }
    }
}

impl<O: IsA<GLDisplay>> GLDisplayExtManual for O {}

impl GLDisplay {
    #[doc(alias = "gst_gl_display_get_gl_context_for_thread")]
    pub fn get_gl_context_for_current_thread(
        display: &gst::ObjectLockGuard<GLDisplay>,
    ) -> Option<GLContext> {
        skip_assert_initialized!();
        unsafe {
            let ctx = ffi::gst_gl_display_get_gl_context_for_thread(
                display.as_ref().to_glib_none().0,
                std::ptr::null_mut(),
            );
            from_glib_full(ctx)
        }
    }

    #[doc(alias = "gst_gl_display_create_context")]
    pub fn create_context(
        display: &gst::ObjectLockGuard<GLDisplay>,
        other_context: Option<&impl IsA<GLContext>>,
    ) -> Result<GLContext, glib::Error> {
        skip_assert_initialized!();
        unsafe {
            let mut p_context = std::ptr::null_mut();
            let mut error = std::ptr::null_mut();
            let is_ok = ffi::gst_gl_display_create_context(
                display.as_ref().to_glib_none().0,
                other_context.map(|p| p.as_ref()).to_glib_none().0,
                &mut p_context,
                &mut error,
            );
            debug_assert_eq!(is_ok == glib::ffi::GFALSE, !error.is_null());
            if error.is_null() {
                Ok(from_glib_full(p_context))
            } else {
                Err(from_glib_full(error))
            }
        }
    }

    #[doc(alias = "gst_gl_display_add_context")]
    pub fn add_context(
        display: &gst::ObjectLockGuard<GLDisplay>,
        context: &impl IsA<GLContext>,
    ) -> Result<(), glib::error::BoolError> {
        skip_assert_initialized!();
        unsafe {
            glib::result_from_gboolean!(
                ffi::gst_gl_display_add_context(
                    display.as_ref().to_glib_none().0,
                    context.as_ref().to_glib_none().0
                ),
                "Failed to add OpenGL context"
            )
        }
    }

    #[cfg(feature = "v1_18")]
    #[cfg_attr(docsrs, doc(cfg(feature = "v1_18")))]
    #[doc(alias = "gst_gl_display_remove_context")]
    pub fn remove_context(
        display: &gst::ObjectLockGuard<GLDisplay>,
        context: &impl IsA<GLContext>,
    ) {
        skip_assert_initialized!();
        unsafe {
            ffi::gst_gl_display_remove_context(
                display.as_ref().to_glib_none().0,
                context.as_ref().to_glib_none().0,
            );
        }
    }
}