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use super::{ProgramSettings, GLSL_VERSION, default_settings, fbo};
use rin_gl::{self as gl, uniforms, Renderer3d};
use rin_util::{Result, Error, LogErr};
use std::{io::Read, path::{Path, PathBuf}, rc::Rc};
use rin_graphics::Vertex2DTex;
use std::cell::{Cell, RefCell};
use rin_events::{Property, ParamsDefault};
#[cfg(gui)]
use rin_gui::ParameterGroup;
#[cfg(glsl_debug)]
use rin_util::AutoLoader;

pub struct Lut {
    lut_path: RefCell<PathBuf>,
    size: Cell<f32>,
    texture_lut: RefCell<Option<gl::Texture>>,
    program: gl::Program,
    fbo: Rc<gl::Fbo>,
    #[cfg(glsl_debug)]
    loader: AutoLoader<gl::Program>,
    fullscreen_quad: Rc<gl::SimpleVao<Vertex2DTex>>
}

fn program_settings() -> ProgramSettings {
    ProgramSettings{
        version: GLSL_VERSION,
        precision: gl::program::ShaderPrecision::High,
        extensions: vec![],
        defines: vec![],
        shaders: vec![
            (gl::VERTEX_SHADER, shader!("shaders/full_quad.vs.glsl")),
            (gl::FRAGMENT_SHADER, shader!("shaders/lut.frag")),
        ],
        .. default_settings()
    }
}

#[derive(ParamsDefault, Clone, Debug)]
#[cfg_attr(gui, derive(ParameterGroup))]
pub struct LutParameters {
    #[cfg_attr(gui, gui(style{
        extension: "cube"
    }))]
    path: Property<'static, PathBuf>,
}

impl Lut {
    pub fn new(gl: &gl::Renderer, w: u32, h: u32, format: gl::fbo::ColorFormat, fullscreen_quad: Rc<gl::SimpleVao<Vertex2DTex>>) -> Result<Lut> {
        #[cfg(glsl_debug)]
        let mut loader = gl.new_auto_program(program_settings());

        let program;


        #[cfg(glsl_debug)]
        {
            program = loader.load().map_err(|err| Error::with_cause("Loading lut program", err))?;
        }

        #[cfg(not(glsl_debug))]
        {
            program = gl.new_program().from_settings(program_settings())
                .log_err("")
                .map_err(|err| Error::with_cause("Loading Lut program", err))?;
        }

        let fbo = fbo(gl, w, h, format)?;

        Ok(Lut{
            size: Cell::new(0.),
            texture_lut: RefCell::new(None),
            lut_path: RefCell::new(PathBuf::new()),
            fbo: Rc::new(fbo),
            #[cfg(glsl_debug)]
            loader,
            program,
            fullscreen_quad,
        })
    }

    fn load_lut<P: AsRef<Path>>(&self, path: P, gl: &gl::Renderer) -> Result<()> {
        if path.as_ref().to_str().unwrap() == "" {
            *self.texture_lut.borrow_mut() = None;
            self.size.set(0.);
            Ok(())
        }else{
            if !path.as_ref().exists() || !path.as_ref().is_file() {
                return Err(Error::new("Path is not a file"))
            }
            let file = std::fs::File::open(&path)
                .map_err(|err| Error::with_cause("Loading Lut from .cube", err))?;
            let mut file = std::io::BufReader::new(file);
            let mut lutdata = String::new();
            file.read_to_string(&mut lutdata)
                .map_err(|err| Error::with_cause("Reading Lut from .cube", err))?;
            let lut: lut_parser::CubeLut<f32> = lut_parser::CubeLut::from_str(&lutdata).unwrap();
            if lut.kind == lut_parser::LutKind::Three {
                let mut texture_lut = gl.new_texture().from_format(gl::texture::Format::new_3d(
                    gl::RGB32F,
                    lut.size as u32,
                    lut.size as u32,
                    lut.size as u32,
                )).map_err(|err| Error::with_cause("Creating lut texture", err))?;
                texture_lut
                    .load_data(lut.flatten_data(), Default::default())
                    .map_err(|err| Error::with_cause("Loading lut texture data", err))?;
                self.size.set(lut.size as f32);
                *self.texture_lut.borrow_mut() = Some(texture_lut);
                println!("Loaded {} size {}", path.as_ref().display(), lut.size);
                Ok(())
            }else{
                Err(Error::new("Can't parse One lut files yet"))
            }
        }
    }

    #[cfg(glsl_debug)]
    pub fn update(&mut self) {
        match self.loader.update(){
            Ok(Some(program)) => {
                self.program = program;
                println!("lut shader reloaded correctly");
            }
            Err(err) => {
                println!("{}", err);
            }
            _ => {}
        }
    }

    pub fn process<'a>(&'a self, gl: &gl::Renderer, source: &'a gl::Texture, parameters: &LutParameters) -> &gl::Texture {
        #[cfg(gl_debug_groups)]
        let _debug_group = gl.new_debug_group(0, "Look up table");

        let path = parameters.path.get();

        if path != &*self.lut_path.borrow() {
            let _ = self.load_lut(path, gl).log_err("");
            *self.lut_path.borrow_mut() = path.clone();
        }

        if let Some(lut) = self.texture_lut.borrow().as_ref() {
            let uniforms = uniforms! {
                source: (source, 1),
                lut: (lut, 2),
                lut_size: self.size.get(),
            };
            gl.with_fbo(&*self.fbo)
                .draw_vao(&*self.fullscreen_quad, &self.program, &uniforms);
            self.fbo.color_tex(0).unwrap()
        }else{
            source
        }
    }

    pub fn fbo(&self) -> &Rc<gl::Fbo> {
        &self.fbo
    }

    pub fn is_loaded(&self) -> bool {
        self.texture_lut.borrow().is_some()
    }
}