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use rin_graphics::{Mesh, Vertex2DTex, CoordinateOrigin};
use color::ToRgba;
use glin::RenderSurface;
use super::Renderer;
use glin::gl;
use glin::uniforms;
use rin_math::{vec2, Pnt2, pnt2};


static BMP_CHAR_8X13_MAP:&'static [[i32;15]] = &[
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[  9,  0,  0,  0,  0,  0,  0,170,  0,  0,  0,130,  0,  0,  0],
[  9,  0,  0,  0,  0,  0,  0,170,  0,  0,  0,130,  0,  0,  0],
[  9,  0,  0,  0,  0,  0,  0,170,  0,  0,  0,130,  0,  0,  0],
[  8,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0],
[  8,  0,  0,  0, 16, 16, 16, 16, 16, 16, 16,  0, 16,  0,  0],
[  8,  0,  0,  0,  0, 16, 56, 84, 80, 80, 84, 56, 16,  0,  0],
[  8,  0,  0,  0,220, 98, 32, 32, 32,112, 32, 34, 28,  0,  0],
[  8,  0,  0,  0,  0, 66, 60, 36, 36, 60, 66,  0,  0,  0,  0],
[  8,  0,  0,  0, 16, 16,124, 16,124, 40, 68,130,130,  0,  0],
[  8,  0,  0,  0, 16, 16, 16, 16,  0, 16, 16, 16, 16,  0,  0],
[  8,  0,  0,  0, 24, 36,  4, 24, 36, 36, 24, 32, 36, 24,  0],
[  8,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,108,  0,  0],
[  8,  0,  0,  0,  0, 56, 68,146,170,162,170,146, 68, 56,  0],
[  8,  0,  0,  0,  0,  0,124,  0, 60, 68, 60,  4, 56,  0,  0],
[  8,  0,  0,  0,  0, 18, 36, 72,144, 72, 36, 18,  0,  0,  0],
[  8,  0,  0,  0,  0,  2,  2,  2,126,  0,  0,  0,  0,  0,  0],
[  8,  0,  0,  0,  0,  0,  0,  0, 60,  0,  0,  0,  0,  0,  0],
[  8,  0,  0,  0,  0, 56, 68,170,178,170,170,146, 68, 56,  0],
[  8,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,126,  0,  0],
[  8,  0,  0,  0,  0,  0,  0,  0,  0, 24, 36, 36, 24,  0,  0],
[  8,  0,  0,  0,  0,124,  0, 16, 16,124, 16, 16,  0,  0,  0],
[  8,  0,  0,  0,  0,  0,  0,  0,120, 64, 48,  8, 72, 48,  0],
[  8,  0,  0,  0,  0,  0,  0,  0, 48, 72,  8, 16, 72, 48,  0],
[  8,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0, 16,  8,  0],
[  8,  0,  0, 64, 90,102, 66, 66, 66, 66,  0,  0,  0,  0,  0],
[  8,  0,  0,  0, 20, 20, 20, 20, 52,116,116,116, 62,  0,  0],
[  8,  0,  0,  0,  0,  0,  0,  0, 24,  0,  0,  0,  0,  0,  0],
[  8,  0, 24,  8,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0],
[  8,  0,  0,  0,  0,  0,  0,  0,112, 32, 32, 32, 96, 32,  0],
[  8,  0,  0,  0,  0,  0,  0,120,  0, 48, 72, 72, 48,  0,  0],
[  8,  0,  0,  0,  0,144, 72, 36, 18, 36, 72,144,  0,  0,  0],
[  8,  0,  0,  0,  6, 26, 18, 10,230, 66, 64, 64,192, 64,  0],
[  8,  0,  0,  0, 30, 16, 12,  2,242, 76, 64, 64,192, 64,  0],
[  8,  0,  0,  0,  6, 26, 18, 10,102,146, 16, 32,144, 96,  0],
[  8,  0,  0,  0, 60, 66, 66, 64, 32, 16, 16,  0, 16,  0,  0],
[  8,  0,  0,  0, 66, 66,126, 66, 66, 36, 24,  0,  8, 16,  0],
[  8,  0,  0,  0, 66, 66,126, 66, 66, 36, 24,  0, 16,  8,  0],
[  8,  0,  0,  0, 66, 66,126, 66, 66, 36, 24,  0, 36, 24,  0],
[  8,  0,  0,  0, 66, 66,126, 66, 66, 36, 24,  0, 76, 50,  0],
[  8,  0,  0,  0, 66, 66,126, 66, 66, 36, 24,  0, 36, 36,  0],
[  8,  0,  0,  0, 66, 66,126, 66, 66, 36, 24, 24, 36, 24,  0],
[  8,  0,  0,  0,158,144,144,240,156,144,144,144,110,  0,  0],
[  8,  0, 16,  8, 60, 66, 64, 64, 64, 64, 64, 66, 60,  0,  0],
[  8,  0,  0,  0,126, 64, 64,120, 64, 64,126,  0,  8, 16,  0],
[  8,  0,  0,  0,126, 64, 64,120, 64, 64,126,  0, 16,  8,  0],
[  8,  0,  0,  0,126, 64, 64,120, 64, 64,126,  0, 36, 24,  0],
[  8,  0,  0,  0,126, 64, 64,120, 64, 64,126,  0, 36, 36,  0],
[  8,  0,  0,  0,124, 16, 16, 16, 16, 16,124,  0, 16, 32,  0],
[  8,  0,  0,  0,124, 16, 16, 16, 16, 16,124,  0, 16,  8,  0],
[  8,  0,  0,  0,124, 16, 16, 16, 16, 16,124,  0, 36, 24,  0],
[  8,  0,  0,  0,124, 16, 16, 16, 16, 16,124,  0, 40, 40,  0],
[  8,  0,  0,  0,120, 68, 66, 66,226, 66, 66, 68,120,  0,  0],
[  8,  0,  0,  0,130,134,138,146,162,194,130,  0,152,100,  0],
[  8,  0,  0,  0,124,130,130,130,130,130,124,  0, 16, 32,  0],
[  8,  0,  0,  0,124,130,130,130,130,130,124,  0, 16,  8,  0],
[  8,  0,  0,  0,124,130,130,130,130,130,124,  0, 36, 24,  0],
[  8,  0,  0,  0,124,130,130,130,130,130,124,  0,152,100,  0],
[  8,  0,  0,  0,124,130,130,130,130,130,124,  0, 40, 40,  0],
[  8,  0,  0,  0,  0, 66, 36, 24, 24, 36, 66,  0,  0,  0,  0],
[  8,  0,  0, 64, 60, 98, 82, 82, 82, 74, 74, 70, 60,  2,  0],
[  8,  0,  0,  0, 60, 66, 66, 66, 66, 66, 66,  0,  8, 16,  0],
[  8,  0,  0,  0, 60, 66, 66, 66, 66, 66, 66,  0, 16,  8,  0],
[  8,  0,  0,  0, 60, 66, 66, 66, 66, 66, 66,  0, 36, 24,  0],
[  8,  0,  0,  0, 60, 66, 66, 66, 66, 66, 66,  0, 36, 36,  0],
[  8,  0,  0,  0, 16, 16, 16, 16, 40, 68, 68,  0, 16,  8,  0],
[  8,  0,  0,  0, 64, 64, 64,124, 66, 66, 66,124, 64,  0,  0],
[  8,  0,  0,  0, 92, 66, 66, 76, 80, 72, 68, 68, 56,  0,  0],
[  8,  0,  0,  0, 58, 70, 66, 62,  2, 60,  0,  0,  8, 16,  0],
[  8,  0,  0,  0, 58, 70, 66, 62,  2, 60,  0,  0,  8,  4,  0],
[  8,  0,  0,  0, 58, 70, 66, 62,  2, 60,  0,  0, 36, 24,  0],
[  8,  0,  0,  0, 58, 70, 66, 62,  2, 60,  0,  0, 76, 50,  0],
[  8,  0,  0,  0, 58, 70, 66, 62,  2, 60,  0,  0, 36, 36,  0],
[  8,  0,  0,  0, 58, 70, 66, 62,  2, 60,  0, 24, 36, 24,  0],
[  8,  0,  0,  0,108,146,144,124, 18,108,  0,  0,  0,  0,  0],
[  8,  0, 16,  8, 60, 66, 64, 64, 66, 60,  0,  0,  0,  0,  0],
[  8,  0,  0,  0, 60, 66, 64,126, 66, 60,  0,  0,  8, 16,  0],
[  8,  0,  0,  0, 60, 66, 64,126, 66, 60,  0,  0, 16,  8,  0],
[  8,  0,  0,  0, 60, 66, 64,126, 66, 60,  0,  0, 36, 24,  0],
[  8,  0,  0,  0, 60, 66, 64,126, 66, 60,  0,  0, 36, 36,  0],
[  8,  0,  0,  0,124, 16, 16, 16, 16, 48,  0,  0, 16, 32,  0],
[  8,  0,  0,  0,124, 16, 16, 16, 16, 48,  0,  0, 32, 16,  0],
[  8,  0,  0,  0,124, 16, 16, 16, 16, 48,  0,  0, 72, 48,  0],
[  8,  0,  0,  0,124, 16, 16, 16, 16, 48,  0,  0, 40, 40,  0],
[  8,  0,  0,  0, 60, 66, 66, 66, 66, 60,  4, 40, 24, 36,  0],
[  8,  0,  0,  0, 66, 66, 66, 66, 98, 92,  0,  0, 76, 50,  0],
[  8,  0,  0,  0, 60, 66, 66, 66, 66, 60,  0,  0, 16, 32,  0],
[  8,  0,  0,  0, 60, 66, 66, 66, 66, 60,  0,  0, 16,  8,  0],
[  8,  0,  0,  0, 60, 66, 66, 66, 66, 60,  0,  0, 36, 24,  0],
[  8,  0,  0,  0, 60, 66, 66, 66, 66, 60,  0,  0, 76, 50,  0],
[  8,  0,  0,  0, 60, 66, 66, 66, 66, 60,  0,  0, 36, 36,  0],
[  8,  0,  0,  0,  0, 16, 16,  0,124,  0, 16, 16,  0,  0,  0],
[  8,  0,  0, 64, 60, 98, 82, 74, 70, 60,  2,  0,  0,  0,  0],
[  8,  0,  0,  0, 58, 68, 68, 68, 68, 68,  0,  0, 16, 32,  0],
[  8,  0,  0,  0, 58, 68, 68, 68, 68, 68,  0,  0, 16,  8,  0],
[  8,  0,  0,  0, 58, 68, 68, 68, 68, 68,  0,  0, 36, 24,  0],
[  8,  0,  0,  0, 58, 68, 68, 68, 68, 68,  0,  0, 40, 40,  0],
[  8,  0, 60, 66,  2, 58, 70, 66, 66, 66,  0,  0, 16,  8,  0],
[  8,  0, 64, 64, 92, 98, 66, 66, 98, 92, 64, 64,  0,  0,  0],
[  8,  0, 60, 66,  2, 58, 70, 66, 66, 66,  0,  0, 36, 36,  0]
];

/// Usually not to be used directly but internally by rin to
/// draw_bitmap_string from a renderer
pub struct BitmapFont{
    texture: glin::Texture,
    char_w: f32,
    char_h: f32,
}

impl BitmapFont{
    // #[cfg(not(feature = "gles"))]
    pub(crate) fn new(gl: &glin::Context) -> BitmapFont{
        let mut tex = gl.new_texture()
            .from_format(glin::texture::Format::new(gl::R8, 16*16, 16*16))
            .unwrap();

        let mut pixels = vec![0u8;16*16*16*16];

        for i in 0 .. 256 {
            let face = &BMP_CHAR_8X13_MAP[i];
            for j in 1 .. 15{
                for k in 0 .. 8 {
                    if  ((face[15-j] << k) & (128)) > 0 {
                        pixels[((i/16))*16*16*16+(i%16)*16 + (j-1)*16*16 + k] = 255;
                    }else{
                        pixels[((i/16))*16*16*16+(i%16)*16 + (j-1)*16*16 + k] = 0;
                    }
                }
            }
        }

        tex.load_data(&pixels, Default::default()).unwrap();
        tex.set_min_mag_filters(gl::LINEAR, gl::NEAREST);


        BitmapFont{
            texture: tex,
            char_w: 8.0f32/256.0f32,
            char_h: 14.0f32/256.0f32,
        }
    }

    fn add_char(c: char, pos: &Pnt2, mesh: &mut Mesh<Vertex2DTex>, num_verts: usize, char_w: f32, char_h: f32, coordinate_origin: CoordinateOrigin){
        if c < (128u8 as char) {
            let tex_w = (((c as u8) % 16) as f32)/16.0f32;
            let tex_h = ((c as i32 as f32 / 16.0f32) as i32) as f32/16.0f32;

            let y1 = tex_h;
            let y2 = tex_h + char_h;

            let offset = match coordinate_origin{
				CoordinateOrigin::BottomLeft | CoordinateOrigin::CenterUp => 14.0,
				CoordinateOrigin::TopLeft | CoordinateOrigin::CenterDown => -14.0,
			};
            let pos_y = match coordinate_origin{
				CoordinateOrigin::BottomLeft | CoordinateOrigin::CenterUp => pos.y + 5.0,
				CoordinateOrigin::TopLeft | CoordinateOrigin::CenterDown => pos.y + 11.0,
			};

            mesh.get_mut(num_verts).texcoord =   vec2(tex_w, y2);
            mesh.get_mut(num_verts+1).texcoord = vec2(tex_w + char_w, y2);
            mesh.get_mut(num_verts+2).texcoord = vec2(tex_w + char_w, y1);

            mesh.get_mut(num_verts+3).texcoord = vec2(tex_w + char_w, y1);
            mesh.get_mut(num_verts+4).texcoord = vec2(tex_w, y1);
            mesh.get_mut(num_verts+5).texcoord = vec2(tex_w, y2);

            mesh.get_mut(num_verts).position =   vec2(pos.x, pos_y);
            mesh.get_mut(num_verts+1).position = vec2(pos.x+8.0, pos_y);
            mesh.get_mut(num_verts+2).position = vec2(pos.x+8.0, pos_y+offset);

            mesh.get_mut(num_verts+3).position = vec2(pos.x+8.0, pos_y+offset);
            mesh.get_mut(num_verts+4).position = vec2(pos.x, pos_y+offset);
            mesh.get_mut(num_verts+5).position = vec2(pos.x, pos_y);
        }
    }

    /// Returns the mesh with texture coordinates to draw a string with this font
    pub fn mesh(&self, string: &str, pos: &Pnt2, coordinate_origin: CoordinateOrigin) -> Mesh<Vertex2DTex>{
        let mut mesh = Mesh::default();
        mesh.reserve(6 * string.len());
        unsafe{
            mesh.set_len(6 * string.len());
        }
        let mut num_verts = 0;
        let font_size = 8.0f32;
        let mut sx = pos.x as f32;
        let mut sy = pos.y as f32 - font_size;
        let line_height = font_size*1.7f32;
        let new_line_direction = 1.0f32;
        let mut column = 0;


        for c in string.chars(){
            if c == '\n'{
                sy += line_height*new_line_direction;
                sx = pos.x as f32;
                column = 0;
            } else if c == '\t'{
                let out = column + 8 - (column % 8);
                sx += font_size * ((out-column) as f32);
                column = out;
            } else if c >= (32u8 as char){
                BitmapFont::add_char(c,
                    &pnt2(sx, sy),
                    &mut mesh,
                    num_verts,
                    self.char_w,
                    self.char_h,
                    coordinate_origin);
                num_verts += 6;
                sx += font_size;
                column+=1;
            }
        }

        if num_verts > 0 {
            mesh.truncate(num_verts);
        }

        mesh
    }

    /// Returns the font texture atlas
    pub fn texture(&self) -> &glin::Texture{
        &self.texture
    }

    /// Returns a material that can be used to draw a mesh with this font
	pub fn material<C: ToRgba>(&self, color: &C) -> Material{
		Material{
			uniforms: uniforms!{
	        	color: color.to_rgba::<f32>(),
	        	src_tex_unit0: self.texture
			},
		}
	}
}

/// Material to draw a bitmap font
pub struct Material{
    uniforms: Vec<glin::program::Uniform>,
}

impl super::Material for Material{
    fn program<R: RenderSurface>(&self, renderer: &Renderer<R>) -> &glin::Program{
        &shaders::get_program(renderer)
    }

    fn uniforms<R: RenderSurface>(&self, _renderer: &Renderer<R>) -> &[glin::program::Uniform]{
        &self.uniforms
    }

    fn properties(&self) -> &[glin::Property]{
        &[
            glin::Property::Blend(true),
            glin::Property::BlendFuncSeparate(
                gl::SRC_ALPHA,
                gl::ONE_MINUS_SRC_ALPHA,
                gl::ONE,
                gl::ONE_MINUS_SRC_ALPHA,
            )
        ]
    }
}

#[cfg(not(any(feature = "gles", feature="webgl")))]
mod shaders{
    program_cache!("shaders/vertex_bitmap_font.glsl", "shaders/fragment_bitmap_font.glsl");
}

#[cfg(any(feature = "gles", feature="webgl"))]
mod shaders{
    program_cache!("shaders/vertex_bitmap_font_gles.glsl", "shaders/fragment_bitmap_font_gles.glsl");
}