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pub use gl::types::*;
#[cfg(not(feature="webgl"))]
use std::os::raw::c_void;

pub trait Image{
    type DataType: Clone + 'static;
    fn gl_internal_format_type(&self) -> Option<(GLenum, GLenum, GLenum)>;
    fn gl_internal(&self) -> Option<GLenum>{
        self.gl_internal_format_type().map(|ift| ift.0)
    }

    fn gl_format(&self) -> Option<GLenum>{
        self.gl_internal_format_type().map(|ift| ift.1)
    }

    fn gl_type(&self) -> Option<GLenum>{
        self.gl_internal_format_type().map(|ift| ift.2)
    }
    fn width(&self, level: usize) -> usize;
    fn height(&self, level: usize) -> usize;
    fn pitch_bytes(&self, level: usize) -> usize;
    fn bytes_per_pixel(&self) -> usize;
    fn pitch_components(&self, level: usize) -> usize;
    fn num_components(&self) -> usize;
    fn data(&self) -> &[Self::DataType];
    fn levels(&self) -> usize;
    fn max_levels(&self) -> usize{
        let mut max = if self.width(0) > self.height(0) { self.width(0) } else { self.height(0) };
        // let max_levels = (max as f32).log2().floor() as i32 + 1;
        let mut max_levels = 1;
        while max>1 {
            max /= 2;
            max_levels += 1;
        }
        max_levels
    }
    fn mipmap(&self, level: usize) -> Option<&[Self::DataType]>;
    fn is_gpu_compressed(&self) -> bool;
}

pub trait CubemapImage: Image{
    fn mipmap_face(&self, level: usize, face: usize) -> Option<&[<Self as Image>::DataType]>;
}

pub struct ScanLines<'a, P: Clone + 'static, I:'a + Image<DataType=P>>{
    line: usize,
    pos: usize,
    level: usize,
    img: &'a I,
    width: usize,
    pitch: usize,
    marker: ::std::marker::PhantomData<P>,
}

impl<'a, P: Clone + 'static, I:'a + Image<DataType=P>> ScanLines<'a, P, I>{
    pub fn new(img: &'a I, level: usize) -> ScanLines<'a, P, I>{
        ScanLines{
            line: 0,
            pos: 0,
            width: img.width(level) * img.num_components(),
            pitch: img.pitch_components(level) * img.num_components(),
            level: level,
            img: img,
            marker: ::std::marker::PhantomData
        }
    }
}

impl<'a, P: 'static + Clone, I:Image<DataType=P>> Iterator for ScanLines<'a, P, I>{
    type Item = &'a [P];
    fn next(&mut self) -> Option<&'a [P]>{
        let ret = if self.line == self.img.height(self.level){
            None
        }else{
            self.img.mipmap(self.level)
                .map(|mipmap| &mipmap[self.pos..self.pos + self.width])
        };

        self.line += 1;
        self.pos += self.pitch;
        ret
    }
}



#[cfg(not(feature="webgl"))]
pub trait GlWindow{
    fn proc_address(&mut self, procname: &str) -> *const c_void;
}

#[cfg(feature="webgl")]
pub trait WebGlWindow{
    fn canvas(&mut self) -> &::stdweb::web::html_element::CanvasElement;
    fn context(&mut self) -> ::stdweb::Reference;
}