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

use std::{mem, ptr};

use glib::{prelude::*, translate::*};

use crate::{AudioDecoder, AudioInfo};

extern "C" {
    fn _gst_audio_decoder_error(
        dec: *mut ffi::GstAudioDecoder,
        weight: i32,
        domain: glib::ffi::GQuark,
        code: i32,
        txt: *mut libc::c_char,
        debug: *mut libc::c_char,
        file: *const libc::c_char,
        function: *const libc::c_char,
        line: i32,
    ) -> gst::ffi::GstFlowReturn;
}

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

pub trait AudioDecoderExtManual: sealed::Sealed + IsA<AudioDecoder> + 'static {
    /// Negotiate with downstream elements to currently configured [`AudioInfo`][crate::AudioInfo].
    /// Unmark GST_PAD_FLAG_NEED_RECONFIGURE in any case. But mark it again if
    /// negotiate fails.
    ///
    /// # Returns
    ///
    /// [`true`] if the negotiation succeeded, else [`false`].
    #[doc(alias = "gst_audio_decoder_negotiate")]
    fn negotiate(&self) -> Result<(), gst::FlowError> {
        unsafe {
            let ret = from_glib(ffi::gst_audio_decoder_negotiate(
                self.as_ref().to_glib_none().0,
            ));
            if ret {
                Ok(())
            } else {
                Err(gst::FlowError::NotNegotiated)
            }
        }
    }

    /// Configure output caps on the srcpad of `self`. Similar to
    /// [`set_output_format()`][Self::set_output_format()], but allows subclasses to specify
    /// output caps that can't be expressed via [`AudioInfo`][crate::AudioInfo] e.g. caps that have
    /// caps features.
    /// ## `caps`
    /// (fixed) [`gst::Caps`][crate::gst::Caps]
    ///
    /// # Returns
    ///
    /// [`true`] on success.
    #[cfg(feature = "v1_16")]
    #[cfg_attr(docsrs, doc(cfg(feature = "v1_16")))]
    #[doc(alias = "gst_audio_decoder_set_output_caps")]
    fn set_output_caps(&self, caps: &gst::Caps) -> Result<(), gst::FlowError> {
        unsafe {
            let ret = from_glib(ffi::gst_audio_decoder_set_output_caps(
                self.as_ref().to_glib_none().0,
                caps.to_glib_none().0,
            ));
            if ret {
                Ok(())
            } else {
                Err(gst::FlowError::NotNegotiated)
            }
        }
    }

    /// Configure output info on the srcpad of `self`.
    /// ## `info`
    /// [`AudioInfo`][crate::AudioInfo]
    ///
    /// # Returns
    ///
    /// [`true`] on success.
    #[doc(alias = "gst_audio_decoder_set_output_format")]
    fn set_output_format(&self, info: &AudioInfo) -> Result<(), gst::FlowError> {
        unsafe {
            let ret = from_glib(ffi::gst_audio_decoder_set_output_format(
                self.as_ref().to_glib_none().0,
                info.to_glib_none().0,
            ));
            if ret {
                Ok(())
            } else {
                Err(gst::FlowError::NotNegotiated)
            }
        }
    }

    /// Lets [`AudioDecoder`][crate::AudioDecoder] sub-classes to know the memory `allocator`
    /// used by the base class and its `params`.
    ///
    /// Unref the `allocator` after use it.
    ///
    /// # Returns
    ///
    ///
    /// ## `allocator`
    /// the [`gst::Allocator`][crate::gst::Allocator]
    /// used
    ///
    /// ## `params`
    /// the
    /// [`gst::AllocationParams`][crate::gst::AllocationParams] of `allocator`
    #[doc(alias = "get_allocator")]
    #[doc(alias = "gst_audio_decoder_get_allocator")]
    fn allocator(&self) -> (Option<gst::Allocator>, gst::AllocationParams) {
        unsafe {
            let mut allocator = ptr::null_mut();
            let mut params = mem::MaybeUninit::uninit();
            ffi::gst_audio_decoder_get_allocator(
                self.as_ref().to_glib_none().0,
                &mut allocator,
                params.as_mut_ptr(),
            );
            (from_glib_full(allocator), params.assume_init().into())
        }
    }

    #[allow(clippy::too_many_arguments)]
    fn error<T: gst::MessageErrorDomain>(
        &self,
        weight: i32,
        code: T,
        message: Option<&str>,
        debug: Option<&str>,
        file: &str,
        function: &str,
        line: u32,
    ) -> Result<gst::FlowSuccess, gst::FlowError> {
        unsafe {
            try_from_glib(_gst_audio_decoder_error(
                self.as_ref().to_glib_none().0,
                weight,
                T::domain().into_glib(),
                code.code(),
                message.to_glib_full(),
                debug.to_glib_full(),
                file.to_glib_none().0,
                function.to_glib_none().0,
                line as i32,
            ))
        }
    }

    fn sink_pad(&self) -> &gst::Pad {
        unsafe {
            let elt = &*(self.as_ptr() as *const ffi::GstAudioDecoder);
            &*(&elt.sinkpad as *const *mut gst::ffi::GstPad as *const gst::Pad)
        }
    }

    fn src_pad(&self) -> &gst::Pad {
        unsafe {
            let elt = &*(self.as_ptr() as *const ffi::GstAudioDecoder);
            &*(&elt.srcpad as *const *mut gst::ffi::GstPad as *const gst::Pad)
        }
    }

    fn input_segment(&self) -> gst::Segment {
        unsafe {
            let ptr: &ffi::GstAudioDecoder = &*(self.as_ptr() as *const _);
            glib::ffi::g_rec_mutex_lock(mut_override(&ptr.stream_lock));
            let segment = ptr.input_segment;
            glib::ffi::g_rec_mutex_unlock(mut_override(&ptr.stream_lock));
            from_glib_none(&segment as *const gst::ffi::GstSegment)
        }
    }

    fn output_segment(&self) -> gst::Segment {
        unsafe {
            let ptr: &ffi::GstAudioDecoder = &*(self.as_ptr() as *const _);
            glib::ffi::g_rec_mutex_lock(mut_override(&ptr.stream_lock));
            let segment = ptr.output_segment;
            glib::ffi::g_rec_mutex_unlock(mut_override(&ptr.stream_lock));
            from_glib_none(&segment as *const gst::ffi::GstSegment)
        }
    }
}

impl<O: IsA<AudioDecoder>> AudioDecoderExtManual for O {}

#[macro_export]
macro_rules! audio_decoder_error(
    ($obj:expr, $weight:expr, $err:expr, ($($msg:tt)*), [$($debug:tt)*]) => { {
        use $crate::prelude::AudioDecoderExtManual;
        $obj.error(
            $weight,
            $err,
            Some(&format!($($msg)*)),
            Some(&format!($($debug)*)),
            file!(),
            $crate::glib::function_name!(),
            line!(),
        )
    }};
    ($obj:expr, $weight:expr, $err:expr, ($($msg:tt)*)) => { {
        use $crate::prelude::AudioDecoderExtManual;
        $obj.error(
            $weight,
            $err,
            Some(&format!($($msg)*)),
            None,
            file!(),
            $crate::glib::function_name!(),
            line!(),
        )
    }};
    ($obj:expr, $weight:expr, $err:expr, [$($debug:tt)*]) => { {
        use $crate::prelude::AudioDecoderExtManual;
        $obj.error(
            $weight,
            $err,
            None,
            Some(&format!($($debug)*)),
            file!(),
            $crate::glib::function_name!(),
            line!(),
        )
    }};
);