//! Demo of a couple metal teapots, one perfectly shiny, and one with roughness 0.1

use image::{
    codecs::hdr::{HdrDecoder, HdrMetadata},
    Rgb,
};
use std::fs::File;
use std::io::BufReader;
use std::sync::Arc;

use rpt::*;

fn rgb_to_color(rgb: Rgb<f32>) -> Color {
    glm::vec3(rgb.0[0] as f64, rgb.0[1] as f64, rgb.0[2] as f64)
}

fn load_hdr(url: &str) -> color_eyre::Result<Hdri> {
    let reader = ureq::get(url).call()?.into_reader();
    let decoder = HdrDecoder::new(BufReader::new(reader))?;
    let HdrMetadata { width, height, .. } = decoder.metadata();
    let pix = decoder.read_image_hdr()?;
    Ok(Hdri::new(
        width,
        height,
        pix.into_iter().map(rgb_to_color).collect(),
    ))
}

fn main() -> color_eyre::Result<()> {
    color_eyre::install()?;

    let hdri = load_hdr("https://hdrihaven.com/files/hdris/ballroom_2k.hdr")?;

    let teapot = Arc::new(load_obj(File::open("examples/teapot.obj")?)?);

    let mut scene = Scene::new();
    scene.environment = Environment::Hdri(hdri);
    scene.add(
        Object::new(
            Arc::clone(&teapot)
                .scale(&glm::vec3(0.5, 0.5, 0.5))
                .translate(&glm::vec3(0.0, -1.7, 0.0)),
        )
        .material(Material::metallic(hex_color(0xffffff), 0.1)),
    );
    scene.add(
        Object::new(
            Arc::clone(&teapot)
                .scale(&glm::vec3(0.5, 0.5, 0.5))
                .translate(&glm::vec3(0.0, 0.2, 0.0)),
        )
        .material(Material::metallic(hex_color(0xffffff), 0.0001)),
    );

    Renderer::new(&scene, Camera::default())
        .width(1200)
        .height(900)
        .max_bounces(5)
        .num_samples(20)
        .render()
        .save("output.png")?;

    Ok(())
}