#include "guecs/sfml/components.hpp"
#include "guecs/ui.hpp"
#include <fmt/xchar.h>
#include <deque>
#include <iostream>
#include <nlohmann/json.hpp>
#include "dbc.hpp"
#include <memory>
#include <filesystem>
#include <fstream>
#include <iostream>
#include "constants.hpp"
#include "control_ui.hpp"


ControlUI::ControlUI(sf::RenderWindow& presenter, sf::RenderWindow& controller) :
    $presenter(presenter),
    $controller(controller),
    $window_size($presenter.getSize())
{
  $gui.position(0, 0, CONTROL_WIDTH, CONTROL_HEIGHT);
  $gui.layout(
      "[status|=%(100,100)current]"
      "[docs|=%(100,100)next]"
      );
}

void ControlUI::config_views(guecs::Entity current, guecs::Entity next) {
  // BUG jank ass bullshit, fix this in lel-guecs
  auto& cur_cell = $gui.cell_for(current);
  $cur_view = std::make_shared<sf::RenderTexture>($presenter.getSize());
  $cur_sprite = std::make_shared<sf::Sprite>($cur_view->getTexture());
  $cur_sprite->setPosition({float(cur_cell.x), float(cur_cell.y)});
  $cur_sprite->setScale({0.3f, 0.3f});

  auto& next_cell = $gui.cell_for(next);
  $next_view = std::make_shared<sf::RenderTexture>($presenter.getSize());
  $next_sprite = std::make_shared<sf::Sprite>($next_view->getTexture());
  $next_sprite->setPosition({float(next_cell.x), float(next_cell.y)});
  $next_sprite->setScale({0.3f, 0.3f});
}

void ControlUI::init() {
  auto status_id = $gui.entity("status");
  $gui.set<guecs::Text>(status_id, {L""});

  auto docs_id = $gui.entity("docs");
  $gui.set<guecs::Text>(docs_id, {L"F: fullscreen\nA: win left\nD: win right\nQ: quit"});
  $gui.init();

  auto current = $gui.entity("current");
  auto next = $gui.entity("next");

  config_views(current, next);

  // warning! must come after init so the thing is there
  $status = $gui.get_if<guecs::Text>(status_id);
  dbc::check($status != nullptr, "failed to setup the status text");
}

inline void render_slide(sf::RenderTexture& view, Slide& slide) {
  view.clear();
  slide.render(view);
  view.display();
}

void ControlUI::render(sf::RenderWindow& window, SlideDeck& deck) {
  dbc::check($status != nullptr, "called render before init?");

  auto pos = $presenter.getPosition();
  auto size = $presenter.getSize();

  $status->update(fmt::format(L"pos={},{}\nsize={},{}",
        pos.x, pos.y, size.x, size.y));

  window.clear();
  $gui.render(window);

  render_slide(*$cur_view, deck.current_slide());
  window.draw(*$cur_sprite);

  /*
  render_slide(*$next_view, deck.preview_slide());
  window.draw(*$next_sprite);
  */
}

void ControlUI::handle_events(std::shared_ptr<SlidesUI> slides, const sf::Event& event) {
  dbc::check($status != nullptr, "handle_events called before init?!");

  if(event.is<sf::Event::Closed>()) {
    $controller.close();
    return;
  }

  if(const auto* key = event.getIf<sf::Event::KeyPressed>()) {
    auto pos = $presenter.getPosition();

    using KEY = sf::Keyboard::Scan;
    switch(key->scancode) {
      case KEY::A: {
          pos.x -= $window_size.x;
          $presenter.setPosition(pos);
        } break;
      case KEY::D: {
        pos.x += int($window_size.x);
        $presenter.setPosition(pos);
       } break;
      case KEY::Q:
        $controller.close();
        break;
      case KEY::F:
        if($full_screen) {
          $presenter.setSize({$window_size.x/2, $window_size.y/2});
          $presenter.setMouseCursorVisible(true);
        } else {
          $presenter.setSize($window_size);
          $presenter.setMouseCursorVisible(false);
        }

        $full_screen = !$full_screen;
        break;
      default:
        slides->handle_events($controller, event);
    }
  }
}