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use rin_graphics::{self as graphics, Vertex2DTex3D};
pub use glin::cubemap::*;
use glin::RenderSurface;
use super::{Renderer, Renderer2d, Render2d};
use glin::{gl, gl::types::*};
use glin::uniforms;
use rin_math::{vec2, vec3, Pnt2, Vec2, Vec3, ToVec, zero};

impl<'a> Render2d for &'a glin::CubeMap{
    type Material = Material<'a>;
    fn default_material(&self) -> Material<'a>{
        Material::new(self)
    }

    fn render_with_material<R: RenderSurface, M: super::Material>(&self, gl: &Renderer<R>, pos: &Pnt2, material: &M){
        self.render_size_with_material(gl, pos, &vec2(self.width() as f32, self.height() as f32), material);
    }

    fn render_size_with_material<R: RenderSurface, M: super::Material>(&self, gl: &Renderer<R>, pos: &Pnt2, size: &Vec2, material: &M){
        let mesh = unwraped_mesh(pos, size, gl.origin());
        gl.draw_mesh_with_material(&mesh, material);
    }
}

/// Represents a cubemap level
///
/// Can be used to easily draw a specific level of this cubemap
#[derive(Copy,Clone)]
pub struct Level<'a>{
    pub cubemap: &'a glin::CubeMap,
    pub level: f32,
}

impl<'a> Render2d for Level<'a>{
    type Material = Material<'a>;
    fn default_material(&self) -> Material<'a>{
        Material::from_level(*self)
    }

    fn render_with_material<R: RenderSurface, M: super::Material>(&self, gl: &Renderer<R>, pos: &Pnt2, material: &M){
        self.cubemap.render_with_material(gl, pos, material);
    }

    fn render_size_with_material<R: RenderSurface, M: super::Material>(&self, gl: &Renderer<R>, pos: &Pnt2, size: &Vec2, material: &M){
        self.cubemap.render_size_with_material(gl, pos, size, material);
    }
}

/// Represents a cubemap levels face
///
/// Can be used to easily draw a specific level of this cubemap
#[derive(Copy,Clone)]
pub struct Face<'a>{
    pub cubemap: &'a glin::CubeMap,
    pub level: f32,
    pub face: GLenum,
}

impl<'a> Render2d for Face<'a>{
    type Material = Material<'a>;
    fn default_material(&self) -> Material<'a>{
        Material::from_level(Level{
            cubemap: self.cubemap,
            level: self.level
        })
    }

    fn render_with_material<R: RenderSurface, M: super::Material>(&self, gl: &Renderer<R>, pos: &Pnt2, material: &M){
        self.render_size_with_material(gl, pos, &vec2(self.cubemap.width() as f32, self.cubemap.height() as f32), material);
    }

    fn render_size_with_material<R: RenderSurface, M: super::Material>(&self, gl: &Renderer<R>, pos: &Pnt2, size: &Vec2, material: &M){
        let mesh = face_mesh(self.face, pos, size, gl.origin());
        gl.draw_mesh_with_material(&mesh, material);
    }
}

/// Material to draw a cubemap as a flat representation
pub struct Material<'a>{
    _cubemap: &'a glin::CubeMap,
    uniforms: Vec<glin::program::Uniform>,
}

impl<'a> Material<'a>{
    pub fn new(cubemap: &glin::CubeMap) -> Material{
        let uniforms = uniforms!{
            cubemap: cubemap,
            level: -1.0,
        };

        Material{
            _cubemap: cubemap,
            uniforms,
        }
    }

    pub fn from_level(level: Level) -> Material{
        let uniforms = uniforms!{
            cubemap: level.cubemap,
            level: level.level,
        };

        Material{
            _cubemap: level.cubemap,
            uniforms,
        }
    }
}

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

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

    fn properties(&self) -> &[glin::Property]{
        &[]
    }
}


program_cache!(glin::program::Settings{
    version: crate::default_glsl_version(),
    precision: glin::program::ShaderPrecision::High,
    shaders: vec![
        (gl::VERTEX_SHADER, include_str!("shaders/vertex_cubemap.glsl")),
        (gl::FRAGMENT_SHADER, include_str!("shaders/fragment_cubemap.glsl")),
    ],
    bindings: crate::default_attribute_bindings().clone(),
    .. Default::default()
}, get_program, CUBEMAP_SHADER);

geometry_cache!(Vertex2DTex3D, unwraped_mesh(&Pnt2::origin(), &zero(), rin_graphics::CoordinateOrigin::BottomLeft));

fn tex_coords(face: GLenum) -> Vec<Vec3>{
    let l = 1.0 / 3.0f32.sqrt();
    match face{
        gl::TEXTURE_CUBE_MAP_NEGATIVE_X => vec![
            vec3(-l,-l,-l),
            vec3(-l,-l,l),
            vec3(-l,l,l),

            vec3(-l,l,l),
            vec3(-l,l,-l),
            vec3(-l,-l,-l),
        ],

        gl::TEXTURE_CUBE_MAP_POSITIVE_Z => vec![
            vec3(-l,-l,l),
            vec3(l,-l,l),
            vec3(l,l,l),

            vec3(l,l,l),
            vec3(-l,l,l),
            vec3(-l,-l,l),
        ],

        gl::TEXTURE_CUBE_MAP_POSITIVE_X => vec![
            vec3(l,-l,l),
            vec3(l,-l,-l),
            vec3(l,l,-l),

            vec3(l,l,-l),
            vec3(l,l,l),
            vec3(l,-l,l),
        ],

        gl::TEXTURE_CUBE_MAP_NEGATIVE_Z => vec![
            vec3(l,-l,-l),
            vec3(-l,-l,-l),
            vec3(-l,l,-l),

            vec3(-l,l,-l),
            vec3(l,l,-l),
            vec3(l,-l,-l),
        ],

        gl::TEXTURE_CUBE_MAP_POSITIVE_Y => vec![
            vec3(-l,l,l),
            vec3(l,l,l),
            vec3(l,l,-l),

            vec3(l,l,-l),
            vec3(-l,l,-l),
            vec3(-l,l,l),
        ],

        gl::TEXTURE_CUBE_MAP_NEGATIVE_Y => vec![
            vec3(-l,-l,-l),
            vec3(l,-l,-l),
            vec3(l,-l,l),

            vec3(l,-l,l),
            vec3(-l,-l,l),
            vec3(-l,-l,-l),
        ],

        _ => panic!("Wrong face!!")
    }
}

pub fn face_mesh(face: GLenum, pos: &Pnt2, size: &Vec2, coordinate_origin: graphics::CoordinateOrigin) -> graphics::Mesh<graphics::Vertex2DTex3D>{
    let pos = pos.to_vec();
    let tex_coords = tex_coords(face);
    let vertices = match coordinate_origin{
        graphics::CoordinateOrigin::BottomLeft | graphics::CoordinateOrigin::CenterUp=> vec![
            graphics::vertex2dtex3d(vec2(pos.x, pos.y), tex_coords[0]),
            graphics::vertex2dtex3d(vec2(pos.x + size.x, pos.y), tex_coords[1]),
            graphics::vertex2dtex3d(vec2(pos.x + size.x, pos.y + size.y), tex_coords[2]),

            graphics::vertex2dtex3d(vec2(pos.x + size.x, pos.y + size.y), tex_coords[3]),
            graphics::vertex2dtex3d(vec2(pos.x, pos.y + size.y), tex_coords[4]),
            graphics::vertex2dtex3d(vec2(pos.x, pos.y), tex_coords[5]),
        ],

        graphics::CoordinateOrigin::TopLeft | graphics::CoordinateOrigin::CenterDown => vec![
            graphics::vertex2dtex3d(vec2(pos.x, pos.y + size.y), tex_coords[0]),
            graphics::vertex2dtex3d(vec2(pos.x + size.x, pos.y + size.y), tex_coords[1]),
            graphics::vertex2dtex3d(vec2(pos.x + size.x, pos.y), tex_coords[2]),

            graphics::vertex2dtex3d(vec2(pos.x + size.x, pos.y), tex_coords[3]),
            graphics::vertex2dtex3d(vec2(pos.x, pos.y), tex_coords[4]),
            graphics::vertex2dtex3d(vec2(pos.x, pos.y + size.y), tex_coords[5]),
        ],
    };

    graphics::mesh(vertices, graphics::PrimitiveType::Triangles)
}

pub fn unwraped_mesh(pos: &Pnt2, size: &Vec2, orig: graphics::CoordinateOrigin) -> graphics::Mesh<graphics::Vertex2DTex3D>{
    let faces = match orig{
        graphics::CoordinateOrigin::BottomLeft | graphics::CoordinateOrigin::CenterUp => [
            (gl::TEXTURE_CUBE_MAP_NEGATIVE_X, vec2(0., size.y)),
            (gl::TEXTURE_CUBE_MAP_POSITIVE_Z, vec2(size.x, size.y)),
            (gl::TEXTURE_CUBE_MAP_POSITIVE_X, vec2(size.x * 2., size.y)),
            (gl::TEXTURE_CUBE_MAP_NEGATIVE_Z, vec2(size.x * 3., size.y)),
            (gl::TEXTURE_CUBE_MAP_POSITIVE_Y, vec2(size.x, size.y * 2.)),
            (gl::TEXTURE_CUBE_MAP_NEGATIVE_Y, vec2(size.x, 0.)),
        ],

        graphics::CoordinateOrigin::TopLeft | graphics::CoordinateOrigin::CenterDown => [
            (gl::TEXTURE_CUBE_MAP_NEGATIVE_X, vec2(0., size.y)),
            (gl::TEXTURE_CUBE_MAP_POSITIVE_Z, vec2(size.x, size.y)),
            (gl::TEXTURE_CUBE_MAP_POSITIVE_X, vec2(size.x * 2., size.y)),
            (gl::TEXTURE_CUBE_MAP_NEGATIVE_Z, vec2(size.x * 3., size.y)),
            (gl::TEXTURE_CUBE_MAP_POSITIVE_Y, vec2(size.x, 0.)),
            (gl::TEXTURE_CUBE_MAP_NEGATIVE_Y, vec2(size.x, size.y * 2.)),
        ],
    };

    let faces = faces.iter().flat_map(|&(face, offset)|{
         let (vertices, _) = face_mesh(face, pos, size, orig).into();
        vertices.into_iter()
            .map(move |vertex| graphics::vertex2dtex3d(vertex.position + offset, vertex.texcoord))
    }).collect();

    graphics::mesh(faces, graphics::PrimitiveType::Triangles)
}