import cython
from cython.cimports import libav as lib
from cython.cimports.av.audio.frame import AudioFrame
from cython.cimports.av.packet import Packet


@cython.final
@cython.cclass
class AudioStream(Stream):
    def __repr__(self):
        if self.codec_context is None:
            return f"<av.AudioStream #{self.index} audio/<nocodec> at 0x{id(self):x}>"
        form = self.format.name if self.format else None
        return (
            f"<av.AudioStream #{self.index} {self.name} at {self.rate}Hz,"
            f" {self.layout.name}, {form} at 0x{id(self):x}>"
        )

    def __getattr__(self, name):
        if self.codec_context is None:
            raise AttributeError(
                f"'{type(self).__name__}' object has no attribute '{name}'"
            )
        return getattr(self.codec_context, name)

    @cython.ccall
    def encode(self, frame: AudioFrame | None = None):
        """
        Encode an :class:`.AudioFrame` and return a list of :class:`.Packet`.

        :rtype: list[Packet]

        .. seealso:: This is mostly a passthrough to :meth:`.CodecContext.encode`.
        """
        self._assert_has_codec_context(lib.AVERROR_ENCODER_NOT_FOUND)
        packets = self.codec_context.encode(frame)
        packet: Packet
        for packet in packets:
            packet._stream = self
            packet.ptr.stream_index = self.ptr.index

        return packets

    @cython.ccall
    def decode(self, packet: Packet | None = None):
        """
        Decode a :class:`.Packet` and return a list of :class:`.AudioFrame`.

        :rtype: list[AudioFrame]

        .. seealso:: This is a passthrough to :meth:`.CodecContext.decode`.
        """
        self._assert_has_codec_context()
        return self.codec_context.decode(packet)
