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use core::{mem::MaybeUninit, ptr};
use x264::*;
use {Data, Encoding, Error, Image, Picture, Result, Setup};

/// Encodes video.
pub struct Encoder {
    raw: *mut x264_t,
    params: x264_param_t,
}

impl Encoder {
    /// Creates a new builder with default options.
    ///
    /// For more options see `Setup::new`.
    pub fn builder() -> Setup {
        Setup::default()
    }

    #[doc(hidden)]
    pub unsafe fn from_raw(raw: *mut x264_t) -> Self {
        let mut params = MaybeUninit::uninit();
        x264_encoder_parameters(raw, params.as_mut_ptr());
        Self {
            raw,
            params: params.assume_init(),
        }
    }

    /// Feeds a frame to the encoder.
    ///
    /// # Panics
    ///
    /// Panics if there is a mismatch between the image and the encoder
    /// regarding width, height or colorspace.
    pub fn encode(&mut self, pts: i64, image: Image) -> Result<(Data, Picture)> {
        assert_eq!(image.width(), self.width());
        assert_eq!(image.height(), self.height());
        assert_eq!(image.encoding(), self.encoding());
        unsafe { self.encode_unchecked(pts, image) }
    }

    /// Feeds a frame to the encoder.
    ///
    /// # Unsafety
    ///
    /// The caller must ensure that the width, height *and* colorspace
    /// of the image are the same as that of the encoder.
    pub unsafe fn encode_unchecked(&mut self, pts: i64, image: Image) -> Result<(Data, Picture)> {
        let image = image.raw();

        let mut picture = MaybeUninit::uninit();
        x264_picture_init(picture.as_mut_ptr());
        let mut picture = picture.assume_init();
        picture.i_pts = pts;
        picture.img = image;

        let mut len = 0;
        let mut stuff = MaybeUninit::uninit();
        let mut raw = MaybeUninit::uninit();

        let err = x264_encoder_encode(self.raw, stuff.as_mut_ptr(), &mut len, &mut picture, raw.as_mut_ptr());

        if err < 0 {
            Err(Error)
        } else {
            let stuff = stuff.assume_init();
            let raw = raw.assume_init();
            let data = Data::from_raw_parts(stuff, len as usize);
            let picture = Picture::from_raw(raw);
            Ok((data, picture))
        }
    }

    /// Gets the video headers, which should be sent first.
    pub fn headers(&mut self) -> Result<Data> {
        let mut len = 0;
        let mut stuff = MaybeUninit::uninit();

        let err = unsafe { x264_encoder_headers(self.raw, stuff.as_mut_ptr(), &mut len) };

        if err < 0 {
            Err(Error)
        } else {
            let stuff = unsafe { stuff.assume_init() };
            Ok(unsafe { Data::from_raw_parts(stuff, len as usize) })
        }
    }

    /// Begins flushing the encoder, to handle any delayed frames.
    ///
    /// ```rust
    /// # use x264::{Colorspace, Setup};
    /// # let encoder = Setup::default().build(Colorspace::RGB, 1920, 1080).unwrap();
    /// #
    /// let mut flush = encoder.flush();
    ///
    /// while let Some(result) = flush.next() {
    ///     if let Ok((data, picture)) = result {
    ///         // Handle data.
    ///     }
    /// }
    /// ```
    pub fn flush(self) -> Flush {
        Flush { encoder: self }
    }

    /// The width required of any input images.
    pub fn width(&self) -> i32 {
        self.params.i_width
    }
    /// The height required of any input images.
    pub fn height(&self) -> i32 {
        self.params.i_height
    }
    /// The encoding required of any input images.
    pub fn encoding(&self) -> Encoding {
        unsafe { Encoding::from_raw(self.params.i_csp) }
    }
}

impl Drop for Encoder {
    fn drop(&mut self) {
        unsafe {
            x264_encoder_close(self.raw);
        }
    }
}

/// Iterate through any delayed frames.
pub struct Flush {
    encoder: Encoder,
}

// TODO: Change to iterator when GATs are stabilized

//impl Iterator for Flush {
impl Flush {
    //type Item<'a> = Result<(Data<'a>, Picture)>;

    /// Keeps flushing.
    pub fn next(&mut self) -> Option<Result<(Data, Picture)>> {
        let enc = self.encoder.raw;

        if unsafe { x264_encoder_delayed_frames(enc) } == 0 {
            return None;
        }

        let mut len = 0;
        let mut stuff = MaybeUninit::uninit();
        let mut raw = MaybeUninit::uninit();

        let err =
            unsafe { x264_encoder_encode(enc, stuff.as_mut_ptr(), &mut len, ptr::null_mut(), raw.as_mut_ptr()) };

        Some(if err < 0 {
            Err(Error)
        } else {
            Ok(unsafe {
                (
                    Data::from_raw_parts(stuff.assume_init(), len as usize),
                    Picture::from_raw(raw.assume_init()),
                )
            })
        })
    }
}