use crate::av::as_ptr::{AsMutPtr, AsPtr};
use crate::av::verify_response;
use ffmpeg_sys_next::{
    av_frame_alloc, av_frame_get_buffer, av_frame_unref, AVFrame, AVPictureType, AVPixelFormat,
    AVSampleFormat,
};

#[derive(Debug)]
pub struct Frame {
    ptr: *mut AVFrame,
    owned: bool,
}

impl Frame {
    pub fn alloc() -> Frame {
        let frame = unsafe { av_frame_alloc() };
        if frame.is_null() {
            panic!("Can't alloc frame");
        }

        Frame {
            ptr: frame,
            owned: true,
        }
    }

    #[inline]
    fn own(&mut self) {
        self.owned = true
    }

    #[inline]
    fn disown(&mut self) {
        self.owned = false
    }

    #[inline]
    pub fn width(&self) -> i32 {
        unsafe { (*self.ptr).width }
    }

    #[inline]
    pub fn height(&self) -> i32 {
        unsafe { (*self.ptr).height }
    }

    #[inline]
    pub fn pict_type(&self) -> AVPictureType {
        unsafe { (*self.ptr).pict_type }
    }

    #[inline]
    pub fn set_pict_type(&self, pict_type: AVPictureType) {
        unsafe { (*self.ptr).pict_type = pict_type }
    }

    #[inline]
    pub fn set_width(&self, width: i32) {
        unsafe { (*self.ptr).width = width }
    }

    #[inline]
    pub fn set_height(&self, height: i32) {
        unsafe { (*self.ptr).height = height }
    }

    #[inline]
    pub fn set_pixel_format(&self, pixel_format: AVPixelFormat) {
        unsafe { (*self.ptr).format = std::mem::transmute(pixel_format) }
    }

    #[inline]
    pub fn pixel_format(&self) -> AVPixelFormat {
        unsafe { std::mem::transmute::<_, AVPixelFormat>((*self.ptr).format) }
    }

    #[inline]
    pub fn set_sample_format(&self, sample_format: AVSampleFormat) {
        unsafe { (*self.ptr).format = std::mem::transmute(sample_format) }
    }

    #[inline]
    pub fn sample_format(&self) -> AVSampleFormat {
        unsafe { std::mem::transmute::<_, AVSampleFormat>((*self.ptr).format) }
    }

    #[inline]
    pub fn nb_samples(&self) -> i32 {
        unsafe { (*self.ptr).nb_samples }
    }

    pub fn allocate_video(
        &mut self,
        pixel_format: AVPixelFormat,
        width: i32,
        height: i32,
    ) -> Result<(), String> {
        self.set_pixel_format(pixel_format);
        self.set_width(width);
        self.set_height(height);

        verify_response("Failed to allocate frame", unsafe {
            av_frame_get_buffer(self.ptr, 32)
        })?;
        Ok(())
    }

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

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

impl AsPtr<AVFrame> for Frame {
    #[inline]
    fn as_ptr(&self) -> *const AVFrame {
        self.ptr
    }
}

impl AsMutPtr<AVFrame> for Frame {
    #[inline]
    fn as_mut_ptr(&self) -> *mut AVFrame {
        self.ptr
    }
}

impl Drop for Frame {
    fn drop(&mut self) {
        if !self.owned {
            return;
        }
        unsafe { av_frame_unref(self.ptr) }
    }
}