/*     _______________   ,----------------------------------------------------------------.
      //`````````````\\  \                                                                 \
     //~~~~~~~~~~~~~~~\\  \   by @ohsqueezy           &  @sleepin                           \ 
    //=================\\  \     [ohsqueezy.itch.io]     [sleepin.itch.io]                   \ 
   //                   \\  \                                                                 \ 
  //                     \\  \  code released under the zlib license [git.nugget.fun/pudding]  \ 
 //      ☆ GUNKISS ☆      \\  \                                                                 \
//_________________________\\  `---------------------------------------------------------------*/

#ifndef Pudding_h_
#define Pudding_h_

#include <stdlib.h>
#include <string>
#include <iostream>
#include <algorithm>
#include <thread>
#include <memory>
#include <stdexcept>
#include <curl/curl.h>
#include "SDL.h"
#include "SDL_image.h"
#include "sdl2-gfx/SDL2_gfxPrimitives.h"
#include "json/json.hpp"
#include "glm/glm.hpp"
#include "opencv2/core.hpp"
#include "opencv2/videoio.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
#include "zbar.h"
#include "Game.hpp"
#include "Color.hpp"
#include "extension.hpp"
#include "filesystem.hpp"
#include "Animation.hpp"
#include "Texture.hpp"
#include "GLObject.hpp"
#include "Log.hpp"
#include "Attributes.hpp"
#include "VBO.hpp"
#include "Item.hpp"
#include "Model.hpp"

class Pudding : public Game
{

private:

    /* Defines for effect IDs that will be passed to the shader program. Since COUNT is last and every value
     * is the default integer, it will define the number of effects available */
    enum Effect
    {
        EFFECT_NONE,
        EFFECT_SNAKE,
        EFFECT_WOBBLE,
        EFFECT_COUNT
    };

    /* Defines for UV transformations available in the fragment shader program */
    enum UVTransformation
    {
        UV_NONE,
        UV_SQUIRCLE
    };

    typedef Game super;
    const std::string OPEN_FOOD_API_URL = "https://world.openfoodfacts.org/api/v0/product/";
    const std::string NUTRONIX_API_URL = "https://trackapi.nutritionix.com/v2/search/item?upc=";
    const std::string BARCODE_MONSTER_API_URL = "https://barcode.monster/api/";
    const std::string BEST_BUY_API_URL_1 = "https://api.bestbuy.com/v1/products(upc=";
    const std::string BEST_BUY_API_URL_2 = ")?format=json&apiKey=";
    const std::string NUTRONIX_NOT_FOUND = "resource not found";
    const std::string GIANTBOMB_API_URL = "https://www.giantbomb.com/api/release/?api_key=";
    const glm::vec3 ZERO_VECTOR_3D = glm::vec3(0, 0, 0);
    const glm::vec3 Y_UNIT_NORMAL_3D = glm::vec3(0, 1, 0);
    const glm::mat4 VIEW_MATRIX = glm::lookAt(glm::vec3(4, 2, 1), glm::vec3(0, -0.325, 0), Y_UNIT_NORMAL_3D);
    const glm::vec3 PUDDING_BROWN = glm::vec3(0.713f, 0.359f, 0.224f);
    const glm::vec3 PUDDING_YELLOW = glm::vec3(0.878f, 0.859f, 0.122f);
    std::string current_barcode, previous_barcode, current_config_barcode, current_camera_barcode;
    std::vector<Item> items;
    int current_item_index = 0, effect_id = EFFECT_NONE, pudding_triangle_vertex_count = 0, pudding_fan_vertex_count = 0,
        current_tile_index = 0;
    cv::VideoCapture capture;
    zbar::ImageScanner image_scanner;
    std::map<std::string, std::map<std::string, GLuint>> uniform;
    GLuint flat_program, mvp_program;
    glm::mat4 projection, model = glm::mat4(1.0f), mvp;
    std::map<std::string, sb::Attributes> pudding_attributes;
    Plane plane;
    bool show_item = false, reading_capture_frame = false;
    SDL_GLContext capture_frame_thread_context = nullptr;
    std::vector<sb::Texture> tiles;
    sb::Texture capture_texture_front_buffer, capture_texture_back_buffer;
    sb::Texture& capture_texture = capture_texture_front_buffer;
    sb::VAO vao;
    sb::VBO vbo;

    void set_pudding_model(float, float, int, int = 1, float = -1, float = 1, float = 0.3f);
    void load_gl_context();
    void load_tiles();
    void initialize_camera();
    void incorporate_open_food_api(Item&);
    void incorporate_nutronix_api(Item&);
    void incorporate_edamam_api(Item&);
    void incorporate_best_buy_api(Item&);
    void save_item_json(const nlohmann::json&, const Item&, const std::string&) const;
    nlohmann::json json_from_url(const std::string&, const std::vector<std::string>& = {});
    void curl_get_bytes(const std::string& url, std::vector<std::uint8_t>&, const std::vector<std::string>& = {}) const;
    static size_t curl_write_response(std::uint8_t*, size_t, size_t, std::vector<std::uint8_t>*);
    sb::Texture texture_from_image_url(const std::string&) const;
    static void destroy_texture(GLuint*);
    bool item_display_active() const;
    static int capture_frame(void*);

public:

    Pudding();
    void respond(SDL_Event&);
    void add_item(const std::string&);
    void increment_item_index(int = 1);
    Item& current_item();
    void update();
    virtual std::string class_name() const { return "Pudding"; }

};

/* Apply force until reaching a threshold. Use a connection object to run user functions
 * when force reaches threshold and when force goes below threshold.
 *
 *  - shares single Plane (vertices in VBO and UV in VBO)
 *  - each has different Texture
 *  - each has different response to click
 *  - shares collision with mouse code
 *  - each has different position
*/
class Button
{
    /* threshold */
    /* force */
    /* close */
    /* open */
    /* apply */
    /* remove */
    /* weighted depression rate */
    /* Animation (?) */
};

class Pad
{
};

/* An abstract base class of an object in a state of either connected or not connected.
 * When the state changes, functions that must be overriden by a derived class are run,
 * one for each state change: from on to off, and from off to on. */
class Connection
{
    
private:
    
    enum State
    {
        STATE_DISCONNECTED,
        STATE_CONNECTED
    };
    State connection_state = STATE_DISCONNECTED;

protected:

    virtual void on_connect() = 0;
    virtual void on_disconnect() = 0;

public:

    Connection() {}
    State state() { return connection_state; }
    void connect() { if (state() != STATE_CONNECTED) { connection_state = STATE_CONNECTED; on_connect(); } }
    void disconnect() { if (state() != STATE_DISCONNECTED) { connection_state = STATE_DISCONNECTED; on_disconnect(); } }
    void toggle() { if (state() == STATE_CONNECTED) disconnect(); else connect(); }
    bool connected() { return connection_state == STATE_DISCONNECTED ? false : true; }

};

#endif