use crate::av::Rational;
use ffmpeg_sys_next::AVPacketSideDataType::AV_PKT_DATA_NEW_EXTRADATA;
use ffmpeg_sys_next::{
    av_packet_alloc, av_packet_get_side_data, av_packet_rescale_ts, av_packet_unref, AVPacket,
};

pub struct Packet(pub *mut AVPacket);

impl Packet {
    pub fn alloc() -> Packet {
        let pkt = unsafe { av_packet_alloc() };
        if pkt.is_null() {
            panic!("Failed to allocate packet");
        }

        Packet(pkt)
    }

    #[inline]
    pub fn stream(&self) -> i32 {
        return unsafe { (*self.0).stream_index };
    }

    #[inline]
    pub fn set_stream(&self, stream_index: i32) {
        unsafe { (*self.0).stream_index = stream_index };
    }

    #[inline]
    pub fn pts(&self) -> i64 {
        unsafe { (*self.0).pts }
    }

    #[inline]
    pub fn set_pts(&self, pts: i64) {
        unsafe { (*self.0).pts = pts }
    }

    #[inline]
    pub fn dts(&self) -> i64 {
        unsafe { (*self.0).dts }
    }

    #[inline]
    pub fn set_dts(&self, dts: i64) {
        unsafe { (*self.0).dts = dts }
    }

    #[inline]
    pub fn rescale<R1: Rational, R2: Rational>(&self, from: R1, to: R2) {
        unsafe {
            av_packet_rescale_ts(self.0, from.to_av(), to.to_av());
        }
    }

    #[inline]
    pub fn duration(&self) -> i64 {
        unsafe { (*self.0).duration }
    }

    #[inline]
    pub fn set_duration(&self, duration: i64) {
        unsafe { (*self.0).duration = duration }
    }

    pub fn extra_data(&self) -> Vec<u8> {
        unsafe {
            let mut size = 0;
            let data = av_packet_get_side_data(self.as_ptr(), AV_PKT_DATA_NEW_EXTRADATA, &mut size);
            let size = size as usize;
            let mut extra_data = vec![0u8; size];
            data.copy_to(extra_data.as_mut_ptr(), size);

            extra_data
        }
    }

    pub fn data(&self) -> Vec<u8> {
        unsafe {
            let size = (*self.0).size as usize;
            let mut data = vec![0u8; size];
            (*self.0).data.copy_to(data.as_mut_ptr(), size);
            data
        }
    }

    #[inline]
    pub fn as_ptr(&self) -> *const AVPacket {
        return self.0;
    }

    #[inline]
    pub fn as_mut_ptr(&self) -> *mut AVPacket {
        return self.0;
    }
}

impl Drop for Packet {
    fn drop(&mut self) {
        unsafe {
            av_packet_unref(self.0);
        }
    }
}