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extern crate image;

use std::ops::Deref;
use std::mem;

use ::Image;
use self::image::{GenericImageView, Pixel};
use std::slice;

use gl::types::*;
use gl;

impl<Pixel,C> Image for image::ImageBuffer<Pixel,C>
    where Pixel: image::Pixel + 'static,
          Pixel::Subpixel: 'static,
          C: Deref<Target=[Pixel::Subpixel]> {

    type DataType = Pixel::Subpixel;

    #[cfg(all(not(feature = "gles"), not(feature="webgl")))]
    fn gl_internal_format_type(&self) -> Option<(GLenum, GLenum, GLenum)> {
        let ift = match Pixel::COLOR_TYPE {
            image::ColorType::Rgb8 => (gl::RGB8, gl::RGB, gl::UNSIGNED_BYTE),
            image::ColorType::Rgb16 => (gl::RGB16, gl::RGB, gl::UNSIGNED_SHORT),
            image::ColorType::Rgba8 => (gl::RGBA8, gl::RGBA, gl::UNSIGNED_BYTE),
            image::ColorType::Rgba16 => (gl::RGBA16, gl::RGBA, gl::UNSIGNED_SHORT),
            image::ColorType::Bgr8 => (gl::RGB8, gl::BGR, gl::UNSIGNED_BYTE),
            image::ColorType::Bgra8 => (gl::RGBA8, gl::BGRA, gl::UNSIGNED_BYTE),
            image::ColorType::L8 => (gl::R8, gl::RED, gl::UNSIGNED_BYTE),
            image::ColorType::L16 => (gl::R16, gl::RED, gl::UNSIGNED_SHORT),
            image::ColorType::La8 => (gl::RG8, gl::RG, gl::UNSIGNED_BYTE),
            image::ColorType::La16 => (gl::RG16, gl::RG, gl::UNSIGNED_SHORT),
            _ => unimplemented!(),
        };

        Some(ift)
    }

    fn num_components(&self) -> usize{
        Pixel::CHANNEL_COUNT as usize
    }

    #[cfg(any(feature = "gles", feature="webgl"))]
    fn gl_internal_format_type(&self) -> Option<(GLenum, GLenum, GLenum)> {
        match Pixel::COLOR_TYPE {
            image::ColorType::Rgb8 => Some((gl::RGB8, gl::RGB, gl::UNSIGNED_BYTE)),
            image::ColorType::Rgb16 => Some((gl::RGB16UI, gl::RGB_INTEGER, gl::UNSIGNED_SHORT)),
            image::ColorType::Rgba8 => Some((gl::RGBA8, gl::RGBA, gl::UNSIGNED_BYTE)),
            image::ColorType::Rgba16 => Some((gl::RGBA16UI, gl::RGBA_INTEGER, gl::UNSIGNED_SHORT)),
            image::ColorType::Bgr8 => None,
            image::ColorType::Bgra8 => Some((gl::RGBA8, gl::BGRA_EXT, gl::UNSIGNED_BYTE)),
            image::ColorType::L8 => Some((gl::R8, gl::RED, gl::UNSIGNED_BYTE)),
            image::ColorType::L16 => Some((gl::R16UI, gl::RED_INTEGER, gl::UNSIGNED_SHORT)),
            image::ColorType::La8 => Some((gl::RG8, gl::RG, gl::UNSIGNED_BYTE)),
            image::ColorType::La16 => Some((gl::RG16UI, gl::RG_INTEGER, gl::UNSIGNED_SHORT)),
            _ => None,
        }
    }

    fn width(&self, _level: usize) -> usize{
        self.width() as usize
    }

    fn height(&self, _level: usize) -> usize{
        self.height() as usize
    }

    fn pitch_bytes(&self, _level: usize) -> usize{
        self.width() as usize * self.bytes_per_pixel()
    }

    fn bytes_per_pixel(&self) -> usize{
        Pixel::CHANNEL_COUNT as usize * mem::size_of::<Pixel::Subpixel>()
    }

    fn pitch_components(&self, _level: usize) -> usize{
        self.width() as usize
    }

    fn data(&self) -> &[Pixel::Subpixel]{
        self
    }

    fn levels(&self) -> usize{
        1
    }

    fn mipmap(&self, level: usize) -> Option<&[Pixel::Subpixel]>{
        if level == 0 {
            Some(self.data())
        }else{
            None
        }
    }

    fn is_gpu_compressed(&self) -> bool{
        false
    }
}

impl Image for image::DynamicImage{
    type DataType = u8;

    #[cfg(all(not(feature = "gles"), not(feature="webgl")))]
    fn gl_internal_format_type(&self) -> Option<(GLenum, GLenum, GLenum)> {
        match self{
            image::DynamicImage::ImageLuma8(_) => Some((gl::R8, gl::RED, gl::UNSIGNED_BYTE)),
            image::DynamicImage::ImageLuma16(_) => Some((gl::R16, gl::RED, gl::UNSIGNED_SHORT)),
            image::DynamicImage::ImageLumaA8(_) => Some((gl::RG8, gl::RG, gl::UNSIGNED_BYTE)),
            image::DynamicImage::ImageLumaA16(_) => Some((gl::RG16, gl::RG, gl::UNSIGNED_SHORT)),
            image::DynamicImage::ImageRgb8(_) => Some((gl::RGB8, gl::RGB, gl::UNSIGNED_BYTE)),
            image::DynamicImage::ImageRgb16(_) => Some((gl::RGB16, gl::RGB, gl::UNSIGNED_SHORT)),
            image::DynamicImage::ImageRgba8(_) => Some((gl::RGBA8, gl::RGBA, gl::UNSIGNED_BYTE)),
            image::DynamicImage::ImageRgba16(_) => Some((gl::RGBA16, gl::RGBA, gl::UNSIGNED_SHORT)),
            image::DynamicImage::ImageBgr8(_) => Some((gl::RGB8, gl::BGR, gl::UNSIGNED_BYTE)),
            image::DynamicImage::ImageBgra8(_) => Some((gl::RGBA8, gl::BGRA, gl::UNSIGNED_BYTE)),
        }
    }

    fn num_components(&self) -> usize{
        <Self as GenericImageView>::Pixel::CHANNEL_COUNT as usize
    }

    #[cfg(any(feature = "gles", feature="webgl"))]
    fn gl_internal_format_type(&self) -> Option<(GLenum, GLenum, GLenum)> {
        match self{
            image::DynamicImage::ImageLuma8(_) => Some((gl::R8, gl::RED, gl::UNSIGNED_BYTE)),
            image::DynamicImage::ImageLuma16(_) => Some((gl::R16UI, gl::RED_INTEGER, gl::UNSIGNED_SHORT)),
            image::DynamicImage::ImageLumaA8(_) => Some((gl::RG8, gl::RG, gl::UNSIGNED_BYTE)),
            image::DynamicImage::ImageLumaA16(_) => Some((gl::RG16UI, gl::RG_INTEGER, gl::UNSIGNED_SHORT)),
            image::DynamicImage::ImageRgb8(_) => Some((gl::RGB8, gl::RGB, gl::UNSIGNED_BYTE)),
            image::DynamicImage::ImageRgb16(_) => Some((gl::RGB16UI, gl::RGB_INTEGER, gl::UNSIGNED_SHORT)),
            image::DynamicImage::ImageRgba8(_) => Some((gl::RGBA8, gl::RGBA, gl::UNSIGNED_BYTE)),
            image::DynamicImage::ImageRgba16(_) => Some((gl::RGBA16UI, gl::RGBA_INTEGER, gl::UNSIGNED_SHORT)),
            image::DynamicImage::ImageBgr8(_) => None,
            image::DynamicImage::ImageBgra8(_) => Some((gl::RGBA8, gl::BGRA_EXT, gl::UNSIGNED_BYTE)),
        }
    }


    fn width(&self, _level: usize) -> usize{
        GenericImageView::width(self) as usize
    }

    fn height(&self, _level: usize) -> usize{
        GenericImageView::height(self) as usize
    }

    fn pitch_bytes(&self, _level: usize) -> usize{
        Image::width(self, 0) * self.bytes_per_pixel()
    }

    fn bytes_per_pixel(&self) -> usize{
        <Self as GenericImageView>::Pixel::CHANNEL_COUNT as usize
            * mem::size_of::<<<Self as GenericImageView>::Pixel as Pixel>::Subpixel>()
    }

    fn pitch_components(&self, _level: usize) -> usize{
        Image::width(self, 0)
    }

    fn data(&self) -> &[u8]{
        match self{
            image::DynamicImage::ImageLuma8(img) => img,
            image::DynamicImage::ImageLumaA8(img) => img,
            image::DynamicImage::ImageRgb8(img) => img,
            image::DynamicImage::ImageRgba8(img) => img,
            image::DynamicImage::ImageBgr8(img) => img,
            image::DynamicImage::ImageBgra8(img) => img,
            image::DynamicImage::ImageLuma16(img) => unsafe {
                let pixels = img.as_ptr();
                slice::from_raw_parts(pixels as *const u8, img.len() * mem::size_of::<u16>())
            },
            image::DynamicImage::ImageLumaA16(img) => unsafe {
                let pixels = img.as_ptr();
                slice::from_raw_parts(pixels as *const u8, img.len() * mem::size_of::<u16>())
            },
            image::DynamicImage::ImageRgb16(img) => unsafe {
                let pixels = img.as_ptr();
                slice::from_raw_parts(pixels as *const u8, img.len() * mem::size_of::<u16>())
            },
            image::DynamicImage::ImageRgba16(img) => unsafe {
                let pixels = img.as_ptr();
                slice::from_raw_parts(pixels as *const u8, img.len() * mem::size_of::<u16>())
            },
        }
    }

    fn levels(&self) -> usize{
        1
    }

    fn mipmap(&self, level: usize) -> Option<&[u8]>{
        if level == 0 {
            Some(self.data())
        }else{
            None
        }
    }

    fn is_gpu_compressed(&self) -> bool{
        false
    }
}