#include "on_screen_help.h"
#include "screen.h"
#include "asset.h"
#include "input.h"
#include "text.h"
#include "sprite.h"
#include "texture.h"
#include "lang.h"

// [SINGLETON] Hay que definir las variables estáticas, desde el .h sólo la hemos declarado
OnScreenHelp *OnScreenHelp::onScreenHelp = nullptr;

// Constantes evaluables en tiempo de compilación
constexpr int ICONSIZE = 16;
constexpr SDL_Point PADDING = {8, 8};
constexpr SDL_Point DESP = {ICONSIZE + 4, 5};

constexpr SDL_Rect CONTROLLER_UP = {16, 16, ICONSIZE, ICONSIZE};
constexpr SDL_Rect CONTROLLER_DOWN = {48, 16, ICONSIZE, ICONSIZE};
constexpr SDL_Rect CONTROLLER_LEFT = {64, 16, ICONSIZE, ICONSIZE};
constexpr SDL_Rect LEFT_BUTTON = {48, 144, ICONSIZE, ICONSIZE};
constexpr SDL_Rect TOP_BUTTON = {0, 144, ICONSIZE, ICONSIZE};
constexpr SDL_Rect RIGHT_BUTTON = {16, 144, ICONSIZE, ICONSIZE};
constexpr SDL_Rect START_BUTTON = {128, 320, ICONSIZE, ICONSIZE};

constexpr SDL_Rect CONTROLLER_UP_POS = {PADDING.x, PADDING.y + 18 * 0, ICONSIZE, ICONSIZE};
constexpr SDL_Rect CONTROLLER_DOWN_POS = {PADDING.x, PADDING.y + 18 * 1, ICONSIZE, ICONSIZE};
constexpr SDL_Rect CONTROLLER_LEFT_POS = {PADDING.x, PADDING.y + 18 * 2, ICONSIZE, ICONSIZE};
constexpr SDL_Rect LEFT_BUTTON_POS = {PADDING.x, PADDING.y + 18 * 3, ICONSIZE, ICONSIZE};
constexpr SDL_Rect TOP_BUTTON_POS = {PADDING.x, PADDING.y + 18 * 4, ICONSIZE, ICONSIZE};
constexpr SDL_Rect RIGHT_BUTTON_POS = {PADDING.x, PADDING.y + 18 * 5, ICONSIZE, ICONSIZE};
constexpr SDL_Rect START_BUTTON_POS = {PADDING.x, PADDING.y + 18 * 6, ICONSIZE, ICONSIZE};

// [SINGLETON] Crearemos el objeto onScreenHelp con esta función estática
void OnScreenHelp::init()
{
    OnScreenHelp::onScreenHelp = new OnScreenHelp();
}

// [SINGLETON] Destruiremos el objeto onScreenHelp con esta función estática
void OnScreenHelp::destroy()
{
    delete OnScreenHelp::onScreenHelp;
}

// [SINGLETON] Con este método obtenemos el objeto onScreenHelp y podemos trabajar con él
OnScreenHelp *OnScreenHelp::get()
{
    return OnScreenHelp::onScreenHelp;
}

// Constructor
OnScreenHelp::OnScreenHelp() : state(OnScreenHelpStatus::showing)
{
    setSize();

    texture = SDL_CreateTexture(Screen::get()->getRenderer(), SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, dest.w, dest.h);
    SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);

    fillTexture();
}

// Destructor
OnScreenHelp::~OnScreenHelp()
{
    SDL_DestroyTexture(texture);
}

// Actualiza la lógica interna
void OnScreenHelp::update()
{
}

// Muestra el objeto en pantalla
void OnScreenHelp::render()
{
    if (state != OnScreenHelpStatus::hidden)
    {
        SDL_RenderCopy(Screen::get()->getRenderer(), texture, nullptr, &dest);
    }
}

// Rellena la textura con los gráficos y texto
void OnScreenHelp::fillTexture()
{
    // Cambia el renderizador a la textura
    SDL_Texture *temp = SDL_GetRenderTarget(Screen::get()->getRenderer());
    SDL_SetRenderTarget(Screen::get()->getRenderer(), texture);

    // Crea el objeto para el texto
    Text *text = new Text(Asset::get()->get("8bithud.png"), Asset::get()->get("8bithud.txt"), Screen::get()->getRenderer());

    // Crea la textura con los gráficos
    Texture *controllersTexture = new Texture(Screen::get()->getRenderer(), Asset::get()->get("controllers.png"));

    // Crea el sprite para dibujar los gráficos
    Sprite *sprite = new Sprite({0, 0, 16, 16}, controllersTexture);

    // Borra la textura
    SDL_SetRenderDrawColor(Screen::get()->getRenderer(), 0, 0, 0, 0);
    SDL_RenderClear(Screen::get()->getRenderer());

    // Pon el color de fondo con el bisel
    SDL_SetRenderDrawColor(Screen::get()->getRenderer(), 0x55, 0x5D, 0x77, 255);
    SDL_Rect rect;
    rect = {4, 0, dest.w - (4 * 2), dest.h};
    SDL_RenderFillRect(Screen::get()->getRenderer(), &rect);

    rect = {4 / 2, 1, dest.w - 4, dest.h - 2};
    SDL_RenderFillRect(Screen::get()->getRenderer(), &rect);

    rect = {1, 4 / 2, dest.w - 2, dest.h - 4};
    SDL_RenderFillRect(Screen::get()->getRenderer(), &rect);

    rect = {0, 4, dest.w, dest.h - (4 * 2)};
    SDL_RenderFillRect(Screen::get()->getRenderer(), &rect);

    // Dibuja los iconos y el texto
    sprite->setSpriteClip(CONTROLLER_UP);
    sprite->setPos(CONTROLLER_UP_POS);
    sprite->render();
    text->write(CONTROLLER_UP_POS.x + DESP.x, CONTROLLER_UP_POS.y + DESP.y, lang::getText(107));

    sprite->setSpriteClip(CONTROLLER_DOWN);
    sprite->setPos(CONTROLLER_DOWN_POS);
    sprite->render();
    text->write(CONTROLLER_DOWN_POS.x + DESP.x, CONTROLLER_DOWN_POS.y + DESP.y, lang::getText(108));

    sprite->setSpriteClip(CONTROLLER_LEFT);
    sprite->setPos(CONTROLLER_LEFT_POS);
    sprite->render();
    text->write(CONTROLLER_LEFT_POS.x + DESP.x, CONTROLLER_LEFT_POS.y + DESP.y, lang::getText(109));

    sprite->setSpriteClip(LEFT_BUTTON);
    sprite->setPos(LEFT_BUTTON_POS);
    sprite->render();
    text->write(LEFT_BUTTON_POS.x + DESP.x, LEFT_BUTTON_POS.y + DESP.y, lang::getText(110));

    sprite->setSpriteClip(TOP_BUTTON);
    sprite->setPos(TOP_BUTTON_POS);
    sprite->render();
    text->write(TOP_BUTTON_POS.x + DESP.x, TOP_BUTTON_POS.y + DESP.y, lang::getText(111));

    sprite->setSpriteClip(RIGHT_BUTTON);
    sprite->setPos(RIGHT_BUTTON_POS);
    sprite->render();
    text->write(RIGHT_BUTTON_POS.x + DESP.x, RIGHT_BUTTON_POS.y + DESP.y, lang::getText(112));

    sprite->setSpriteClip(START_BUTTON);
    sprite->setPos(START_BUTTON_POS);
    sprite->render();
    text->write(START_BUTTON_POS.x + DESP.x, START_BUTTON_POS.y + DESP.y, lang::getText(113));

    // text->write(0, 0, "hola");

    // Restaura el destino de renderizado
    SDL_SetRenderTarget(Screen::get()->getRenderer(), temp);

    // Elimina los objetos
    delete text;
    delete controllersTexture;
    delete sprite;
}

// Define el ancho y alto de la textura
void OnScreenHelp::setSize()
{
    const int textSize = getLargestStringSize();
    dest = (SDL_Rect){8, 8, PADDING.x + DESP.x + textSize + PADDING.x, PADDING.y + (7 * 18) + PADDING.y};
}

// Activa o desactiva el objeto
void OnScreenHelp::toggleState()
{
    state = state == OnScreenHelpStatus::showing ? OnScreenHelpStatus::hidden : OnScreenHelpStatus::showing;
}

// Calcula la longitud en pixels del texto más largo
int OnScreenHelp::getLargestStringSize() const
{
    Text *text = new Text(Asset::get()->get("8bithud.png"), Asset::get()->get("8bithud.txt"), Screen::get()->getRenderer());
    int size = 0;

    for (int i = 107; i <= 113; ++i)
    {
        const int textSize = text->lenght(lang::getText(i));
        size = textSize > size ? textSize : size;
    }

    delete text;
    return size;
}