#include "scene.hpp"

#include <filesystem>

#include "utils.hpp"
#include "gltf.hpp"

// Return the number of instantiated spheres
void scene::random_scene() {
    material ground_material = { { 0.5, 0.5, 0.5 } };
    ground_material.type = MATERIAL_TYPE::LAMBERTIAN;
    spheres.emplace_back(vec3 { 0, -1000, 0 }, ground_material, 1000);

    int32_t spheres_count = 11;
    for (int a = -spheres_count; a < spheres_count; a++) {
        for (int b = -spheres_count; b < spheres_count; b++) {
            auto choose_mat = randd();
            point3 center(a + 0.9 * randd(), 0.2, b + 0.9 * randd());

            if ((center - point3{ 4, 0.2, 0 }).length() > 0.9) {
                material sphere_material = {};

                if (choose_mat < 0.8) {
                    // diffuse
                    sphere_material.albedo = color::random() * color::random();
                    sphere_material.type = MATERIAL_TYPE::LAMBERTIAN;
                } else if (choose_mat < 0.95) {
                    // metal
                    sphere_material.albedo = color::random(0.5, 1);
                    sphere_material.fuzz = randd(0, 0.5);
                    sphere_material.type = MATERIAL_TYPE::METAL;
                } else {
                    // glass
                    sphere_material.ior = 1.5;
                    sphere_material.type = MATERIAL_TYPE::DIELECTRIC;
                }

                spheres.emplace_back(center, sphere_material, 0.2);
            }
        }
    }

    material material1 = {};
    material1.ior = 1.5;
    material1.type = MATERIAL_TYPE::DIELECTRIC;
    spheres.emplace_back(vec3 { 0, 1, 0 }, material1, 1.0);

    material material2 = {};
    material2.albedo = color{ 0.4, 0.2, 0.1 };
    material2.type = MATERIAL_TYPE::LAMBERTIAN;
    spheres.emplace_back(vec3 { -4, 1, 0 }, material2, 1.0);

    material material3 = {};
    material3.albedo = color{ 0.7, 0.6, 0.5 };
    material3.fuzz = 0.0;
    material3.type = MATERIAL_TYPE::METAL;
    spheres.emplace_back(vec3 { 4, 1, 0 }, material3, 1.0);

    material material4 = {};
    material4.albedo = color{ 0.0, 0.0, 0.0 };
    material4.emissive = color{ 1.0, 1.0, 1.0 } * 1000.0;
    material4.fuzz = 0.0;
    material4.type = MATERIAL_TYPE::EMISSIVE;
    spheres.emplace_back(vec3 { 2, 1.5, 2 }, material4, 0.5);

    spheres_count = spheres.size();
}

scene::scene(camera cam, uint32_t width, uint32_t height)
    :meta(cam, width, height){

    // auto sponza_path = std::filesystem::path("../models/sponza");
    // auto sponza_filename = std::string("Sponza.gltf");
    // auto mesh = gltf::load(sponza_path, sponza_filename);

    // auto node = mesh.nodes[0];
    // for (auto& mesh_part: node) {
    //     for (size_t i = 0; i < mesh_part.indices.size(); i += 3) {
    //         auto i1 = mesh_part.indices[i];
    //         auto i2 = mesh_part.indices[i + 1];
    //         auto i3 = mesh_part.indices[i + 2];

    //         auto v1 = vertex { .position = mesh_part.positions[i1], .normal = mesh_part.normals[i1] };
    //         auto v2 = vertex { .position = mesh_part.positions[i2], .normal = mesh_part.normals[i2] };
    //         auto v3 = vertex { .position = mesh_part.positions[i3], .normal = mesh_part.normals[i3] };

    //         triangles.emplace_back(v1, v2, v3);
    //     }
    // }

    random_scene();

    // bvh builder(triangles, nodes);
    bvh builder(spheres, nodes);
    // builder.exporter();

    for (uint32_t idx = 0; idx < builder.nodes.size(); idx++) {
        nodes[idx] = builder.nodes[idx];
    }
}