#include "scene.hpp"

#include <filesystem>
#include <queue>

#include "vk-renderer.hpp"
#include "gltf.hpp"
#include "bvh.hpp"
#include "material.hpp"

// void scene::random_scene() {
//     material ground_material = { { 0.5, 0.5, 0.5 } };
//     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.base_color = color::random() * color::random();
//                 } else if (choose_mat < 0.95) {
//                     // metal
//                     sphere_material.base_color = color::random(0.5, 1);
//                     sphere_material.metalness = randd(0, 0.5);
//                     sphere_material.roughness = 0.f;
//                 } else {
//                     // glass
//                     // sphere_material.ior = 1.5;
//                     sphere_material.metalness = 1.f;
//                     sphere_material.roughness = 0.f;
//                 }
// 
//                 spheres.emplace_back(center, sphere_material, 0.2);
//             }
//         }
//     }
// 
//     material material1 = {};
//     // material1.ior = 1.5;
//     spheres.emplace_back(vec3 { 0, 1, 0 }, material1, 1.0);
// 
//     material material2 = {};
//     material2.base_color = color{ 0.4, 0.2, 0.1 };
//     spheres.emplace_back(vec3 { -4, 1, 0 }, material2, 1.0);
// 
//     material material3 = {};
//     material3.base_color = color{ 0.7, 0.6, 0.5 };
//     material3.roughness = 0.0;
//     spheres.emplace_back(vec3 { 4, 1, 0 }, material3, 1.0);
// 
//     spheres_count = spheres.size();
// }


scene::metadata::metadata(const camera &cam, uint32_t width, uint32_t height)
    : cam(cam), width(width), height(height) {}

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

    // Geometry & BVH
    std::vector<uint32_t>   indices;
    std::vector<float>      positions;
    std::vector<float>      normals;
    std::vector<float>      uvs;
    std::vector<material>   materials;
    std::vector<packed_bvh_node> packed_nodes;

    // auto root_node = gltf::load("../models/BistroInterior", "BistroInterior.gltf");
    auto model = gltf("../models/sponza/Sponza.gltf");

    std::vector<triangle> triangles;
    // size_t triangles_offset = 0;
    // size_t vertices_offset = 0;
    // std::queue<node> nodes_to_load {};
    // nodes_to_load.push(model.root_node);

    // while(!nodes_to_load.empty()) {
    //     auto &node = nodes_to_load.front();

        // if (node.mesh != nullptr) {
            // auto &mesh = node.mesh.value();

            // indices.resize(indices.size()       + (size_t)mesh.triangle_count() * 3);
            // positions.resize(positions.size()   + (size_t)mesh.vertex_count() * 3);
            // normals.resize(normals.size()       + (size_t)mesh.vertex_count() * 3);
            // uvs.resize(uvs.size()               + (size_t)mesh.vertex_count() * 2);


            // for (auto& mesh_part: mesh.parts) {
            //     std::memcpy(positions.data()    + vertices_offset * 3, mesh_part.positions.data(), mesh_part.positions.size() * sizeof(float));
            //     std::memcpy(normals.data()      + vertices_offset * 3, mesh_part.normals.data(),   mesh_part.normals.size() * sizeof(float));
            //     std::memcpy(uvs.data()          + vertices_offset * 2, mesh_part.uvs.data(),       mesh_part.uvs.size() * sizeof(float));

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

            //         auto p1 = vec3(mesh_part.positions[i1 * 3], mesh_part.positions[i1 * 3 + 1], mesh_part.positions[i1 * 3 + 2]);
            //         auto p2 = vec3(mesh_part.positions[i2 * 3], mesh_part.positions[i2 * 3 + 1], mesh_part.positions[i2 * 3 + 2]);
            //         auto p3 = vec3(mesh_part.positions[i3 * 3], mesh_part.positions[i3 * 3 + 1], mesh_part.positions[i3 * 3 + 2]);

            //         indices[triangles_offset * 3 + i]        = (i1 + vertices_offset) | (0xff000000 & (materials.size() << 8));
            //         indices[triangles_offset * 3 + i + 1]    = (i2 + vertices_offset) | (0xff000000 & (materials.size() << 16));
            //         indices[triangles_offset * 3 + i + 2]    = (i3 + vertices_offset) | (0xff000000 & (materials.size() << 24));

            //         triangles.emplace_back(p1, p2, p3);
            //         materials.push_back(mesh_part.mat);
            //     }

            //     triangles_offset += mesh_part.triangles_count;
            //     vertices_offset += mesh_part.vertices_count;
            // }
        // }

        // for (auto &new_node: node.children) {
        //     nodes_to_load.push(new_node);
        // }

        // nodes_to_load.pop();
    // }

    // random_scene();

    bvh builder(triangles, packed_nodes);
    // bvh builder(spheres, packed_nodes);

    scene_buffer = vkrenderer::create_buffer(sizeof(meta) * vkrenderer::virtual_frames_count);
    // TODO: Write to correct offset
    // vkrenderer::update_buffer(scene_buffer, &meta, 0, sizeof(meta));

    indices_buffer = vkrenderer::create_buffer(indices.size() * sizeof(indices[0]));
    indices_buffer->write(indices.data(), 0, indices.size() * sizeof(indices[0]));

    positions_buffer = vkrenderer::create_buffer(positions.size() * sizeof(positions[0]));
    positions_buffer->write(positions.data(), 0, positions.size() * sizeof(positions[0]));

    normals_buffer = vkrenderer::create_buffer(normals.size() * sizeof(normals[0]));
    normals_buffer->write(normals.data(), 0, normals.size() * sizeof(normals[0]));

    uvs_buffer = vkrenderer::create_buffer(uvs.size() * sizeof(uvs[0]));
    uvs_buffer->write(uvs.data(), 0, uvs.size() * sizeof(uvs[0]));

    bvh_buffer = vkrenderer::create_buffer(packed_nodes.size() * sizeof(packed_nodes[0]));
    bvh_buffer->write(packed_nodes.data(), 0, packed_nodes.size() * sizeof(packed_nodes[0]));

    materials_buffer = vkrenderer::create_buffer(materials.size() * sizeof(materials[0]));
    materials_buffer->write(materials.data(), 0, materials.size() * sizeof(materials[0]));
}