//
//  serial.cxx
//  engine
//
//  Created by Sam Jaffe on 5/20/19.
//  Copyright © 2019 Sam Jaffe. All rights reserved.
//

#include "game/engine/serial.hpp"

#include <json/json.h>

#include "game/graphics/material.hpp"
#include "game/graphics/object.hpp"
#include "game/util/flyweight.hpp"
#include "vector/vector.hpp"

namespace engine {
  math::vec2 to_vec2(Json::Value const & json) {
    return make_vector(json[0].asFloat(), json[1].asFloat());
  }

  math::vec2 to_vec2(Json::Value const & json, math::vec2 const & backup) {
    return json.isNull() ? backup : to_vec2(json);
  }

  flyweight<graphics::shader_program> to_program(Json::Value const & json) {
    using graphics::shader_program;
    if (json.empty()) {
      return shader_program::create("data/shaders/BlankShader.fragment.glsl",
                                    "data/shaders/BlankShader.vertex.glsl");
    }
    return shader_program::create(json["fragmentShader"].asString(),
                                  json["vertexShader"].asString());
  }

  flyweight<graphics::material> to_material(Json::Value const & json) {
    auto & prog = to_program(json["shaderProgram"]).actual();
    return graphics::material::create(prog, json["texture"]["file"].asString(),
                                      json["texture"]["uniform"].asString());
  }

  graphics::object to_object(Json::Value const & json) {
    flyweight<graphics::material> mat = to_material(json["material"]);
    auto frame_size = to_vec2(json["frameSize"], make_vector(1.f, 1.f));
    math::dim2::rectangle pos = {to_vec2(json["position"]),
                                 mat.actual().size() * frame_size};
    return {pos, pos, mat, {{{0, 0}}, frame_size}};
  }
}