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

use crate::{RTPHeaderExtension, RTPHeaderExtensionFlags};

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

pub trait RTPHeaderExtensionExtManual: sealed::Sealed + IsA<RTPHeaderExtension> + 'static {
    /// Read the RTP header extension from `data`.
    /// ## `read_flags`
    /// [`RTPHeaderExtensionFlags`][crate::RTPHeaderExtensionFlags] for how the extension should
    ///  be written
    /// ## `data`
    /// location to read the rtp header extension from
    /// ## `buffer`
    /// a [`gst::Buffer`][crate::gst::Buffer] to modify if necessary
    ///
    /// # Returns
    ///
    /// whether the extension could be read from `data`
    #[doc(alias = "gst_rtp_header_extension_read")]
    fn read(
        &self,
        read_flags: RTPHeaderExtensionFlags,
        data: &[u8],
        buffer: &mut gst::BufferRef,
    ) -> bool {
        let size = data.len();
        unsafe {
            from_glib(ffi::gst_rtp_header_extension_read(
                self.as_ref().to_glib_none().0,
                read_flags.into_glib(),
                data.to_glib_none().0,
                size,
                buffer.as_mut_ptr(),
            ))
        }
    }

    /// Writes the RTP header extension to `data` using information available from
    /// the `input_meta`. `data` will be sized to be at least the value returned
    /// from [`RTPHeaderExtensionExt::max_size()`][crate::prelude::RTPHeaderExtensionExt::max_size()].
    /// ## `input_meta`
    /// the input [`gst::Buffer`][crate::gst::Buffer] to read information from if necessary
    /// ## `write_flags`
    /// [`RTPHeaderExtensionFlags`][crate::RTPHeaderExtensionFlags] for how the extension should
    ///  be written
    /// ## `output`
    /// output RTP [`gst::Buffer`][crate::gst::Buffer]
    /// ## `data`
    /// location to write the rtp header extension into
    ///
    /// # Returns
    ///
    /// the size of the data written, < 0 on failure
    #[doc(alias = "gst_rtp_header_extension_write")]
    fn write(
        &self,
        input_meta: &gst::Buffer,
        write_flags: RTPHeaderExtensionFlags,
        output: &mut gst::BufferRef,
        data: &mut [u8],
    ) -> Result<usize, glib::BoolError> {
        let size = data.len();
        unsafe {
            let res = ffi::gst_rtp_header_extension_write(
                self.as_ref().to_glib_none().0,
                input_meta.to_glib_none().0,
                write_flags.into_glib(),
                output.as_mut_ptr(),
                data.to_glib_none().0,
                size,
            );

            if res < 0 {
                Err(glib::bool_error!("Failed to write header extension"))
            } else {
                Ok(res as usize)
            }
        }
    }

    /// [`RTPHeaderExtensionExt::set_id()`][crate::prelude::RTPHeaderExtensionExt::set_id()] must have been called with a valid
    /// extension id that is contained in these caps.
    ///
    /// The only current known caps format is based on the SDP standard as produced
    /// by `gst_sdp_media_attributes_to_caps()`.
    /// ## `caps`
    /// writable [`gst::Caps`][crate::gst::Caps] to modify
    ///
    /// # Returns
    ///
    /// whether the configured attributes on `self` can successfully be set on
    ///     `caps`
    #[doc(alias = "gst_rtp_header_extension_set_caps_from_attributes")]
    fn set_caps_from_attributes(&self, caps: &mut gst::CapsRef) -> bool {
        unsafe {
            from_glib(ffi::gst_rtp_header_extension_set_caps_from_attributes(
                self.as_ref().to_glib_none().0,
                caps.as_mut_ptr(),
            ))
        }
    }

    /// Helper implementation for GstRTPExtensionClass::set_caps_from_attributes
    /// that sets the `self` uri on caps with the specified extension id as required
    /// for sdp [`gst::Caps`][crate::gst::Caps].
    ///
    /// Requires that the extension does not have any attributes or direction
    /// advertised in `caps`.
    /// ## `caps`
    /// [`gst::Caps`][crate::gst::Caps] to write fields into
    ///
    /// # Returns
    ///
    /// whether the `self` attributes could be set on `caps`.
    #[doc(alias = "gst_rtp_header_extension_set_caps_from_attributes_helper")]
    fn set_caps_from_attributes_helper(&self, caps: &mut gst::CapsRef, attributes: &str) -> bool {
        unsafe {
            from_glib(
                ffi::gst_rtp_header_extension_set_caps_from_attributes_helper(
                    self.as_ref().to_glib_none().0,
                    caps.as_mut_ptr(),
                    attributes.to_glib_none().0,
                ),
            )
        }
    }

    /// Updates depayloader src caps based on the information received in RTP header.
    /// `caps` must be writable as this function may modify them.
    /// ## `caps`
    /// src [`gst::Caps`][crate::gst::Caps] to modify
    ///
    /// # Returns
    ///
    /// whether `caps` were modified successfully
    #[doc(alias = "gst_rtp_header_extension_update_non_rtp_src_caps")]
    fn update_non_rtp_src_caps(&self, caps: &mut gst::CapsRef) -> bool {
        unsafe {
            from_glib(ffi::gst_rtp_header_extension_update_non_rtp_src_caps(
                self.as_ref().to_glib_none().0,
                caps.as_mut_ptr(),
            ))
        }
    }
}

impl<O: IsA<RTPHeaderExtension>> RTPHeaderExtensionExtManual for O {}