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// Take a look at the license at the top of the repository in the LICENSE file.

use std::{
    marker::PhantomData,
    ptr::{self, addr_of},
};

use glib::translate::*;
use gst_rtsp::RTSPUrl;

#[derive(Debug, PartialEq, Eq)]
#[doc(alias = "GstRTSPContext")]
#[repr(transparent)]
pub struct RTSPContext(ptr::NonNull<ffi::GstRTSPContext>);

impl RTSPContext {
    #[inline]
    pub fn with_current_context<F: FnOnce(&RTSPContext) -> T, T>(func: F) -> Option<T> {
        unsafe {
            let ptr = ffi::gst_rtsp_context_get_current();
            if ptr.is_null() {
                return None;
            }

            let ctx = RTSPContext(ptr::NonNull::new_unchecked(ptr));
            Some(func(&ctx))
        }
    }

    #[inline]
    pub fn uri(&self) -> Option<&RTSPUrl> {
        unsafe {
            let ptr = self.0.as_ptr();
            if (*ptr).uri.is_null() {
                None
            } else {
                let uri = RTSPUrl::from_glib_ptr_borrow(
                    addr_of!((*ptr).uri) as *const *const gst_rtsp::ffi::GstRTSPUrl
                );
                Some(uri)
            }
        }
    }

    // TODO: Add additional getters for all the contained fields as needed
}

#[doc(hidden)]
impl FromGlibPtrBorrow<*mut ffi::GstRTSPContext> for RTSPContext {
    #[inline]
    unsafe fn from_glib_borrow(ptr: *mut ffi::GstRTSPContext) -> Borrowed<Self> {
        debug_assert!(!ptr.is_null());
        Borrowed::new(RTSPContext(ptr::NonNull::new_unchecked(ptr)))
    }
}

#[doc(hidden)]
impl<'a> ToGlibPtr<'a, *mut ffi::GstRTSPContext> for RTSPContext {
    type Storage = PhantomData<&'a RTSPContext>;

    #[inline]
    fn to_glib_none(&'a self) -> Stash<'a, *mut ffi::GstRTSPContext, Self> {
        Stash(self.0.as_ptr(), PhantomData)
    }

    fn to_glib_full(&self) -> *mut ffi::GstRTSPContext {
        unimplemented!()
    }
}