#include "guecs/sfml/backend.hpp"
#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>

constexpr const int WINDOW_WIDTH=1280;
constexpr const int WINDOW_HEIGHT=720;
constexpr const int FRAME_LIMIT=60;
constexpr const bool VSYNC=true;

using std::string, std::wstring, std::shared_ptr, std::make_shared;
using nlohmann::json;

struct Slide {
  guecs::UI $gui;
  wstring $title;
  wstring $content;
  bool $initialized = false;

  Slide(const string& title, const string& content) :
    $title(guecs::to_wstring(title)),
    $content(guecs::to_wstring(content))
  {
  }

  void init(lel::Cell& cell) {
    if(!$initialized) {
      $initialized = true;

      $gui.position(cell.x, cell.y, cell.w, cell.h);
      $gui.layout(
          "[=*%(300,200)title|_|_]"
          "[_|_|_]"
          "[=*%(300,300)content|_|_]"
          "[_|_|_]"
          "[_|_|_]");

      auto title = $gui.entity("title");
      $gui.set<guecs::Text>(title, {
          $title, 124});

      auto content = $gui.entity("content");
      $gui.set<guecs::Text>(content, {
          $content,
          56, guecs::THEME.TEXT_COLOR, 20});

      $gui.init();
    }
  }

  void render(sf::RenderWindow& window) {
    $gui.render(window);
    // $gui.debug_layout(window);
  }
};

using SlideDeck = std::vector<Slide>;


struct SlidesUI {
  guecs::UI $gui;
  shared_ptr<SlideDeck> $slides = nullptr;
  size_t $current = 0;

  SlidesUI(shared_ptr<SlideDeck> slides) {
    dbc::check(slides != nullptr, "slides is null");
    dbc::check(slides->size() > 0, "slide deck is empy");
    $slides = slides;
    $current = 0;

    $gui.position(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
    $gui.layout(
        "[t_left|t_center|t_right]"
        "[m_left|*%(300,400)slide|_|_|m_right]"
        "[_|_|_|_|_]"
        "[_|_|_|_|_]"
        "[_|_|_|_|_]"
        "[_|_|_|_|_]"
        "[b_left|b_center|b_right]"
    );
  }

  void init() {
    guecs::Background bg{$gui.$parser, };
    bg.set_color(guecs::THEME.BG_COLOR_DARK);
    $gui.set<guecs::Background>($gui.MAIN, bg);

    show_slide();

    $gui.init();
  }

  Slide& current() {
    return $slides->at($current);
  }

  void next_slide() {
    if($current < $slides->size() - 1) {
      $current++;
      show_slide();
    }
  }

  void prev_slide() {
    if($current > 0) {
      $current--;
      show_slide();
    }
  }

  void show_slide() {
    auto& slide = current();
    auto& cell = $gui.cell_for("slide");
    slide.init(cell);
  }

  void render(sf::RenderWindow& window) {
    $gui.render(window);

    auto& slide = current();
    slide.render(window);

    // $gui.debug_layout(window);
  }

  void mouse(float x, float y, guecs::Modifiers mods) {
    $gui.mouse(x, y, mods);

    if(mods.test(guecs::ModBit::left)) {
      next_slide();
    } else if(mods.test(guecs::ModBit::right)) {
      prev_slide();
    }
  }
};


shared_ptr<SlideDeck> parse_slides(const string& md_file) {
  shared_ptr<SlideDeck> slides = make_shared<SlideDeck>();

  for(int i = 0; i < 10; i++) {
    slides->emplace_back(fmt::format("Title {}", i),"content");
  }

  (void)md_file;

  return slides;
}

int main() {
  sfml::Backend backend;
  guecs::init(&backend);

  sf::RenderWindow window(sf::VideoMode({WINDOW_WIDTH, WINDOW_HEIGHT}), "Besos Loves Slides");
  window.setFramerateLimit(FRAME_LIMIT);
  window.setVerticalSyncEnabled(VSYNC);

  auto data = parse_slides("some_bullshit.md");
  SlidesUI slides(data);
  slides.init();

  while(window.isOpen()) {
    while (const auto event = window.pollEvent()) {
      if(event->is<sf::Event::Closed>()) {
        window.close();
      }

      if(const auto* mouse = event->getIf<sf::Event::MouseButtonPressed>()) {
        sf::Vector2f pos = window.mapPixelToCoords(mouse->position);

        if(mouse->button == sf::Mouse::Button::Left) {
          slides.mouse(pos.x, pos.y, {1 << guecs::ModBit::left});
        } else if(mouse->button == sf::Mouse::Button::Right) {
          slides.mouse(pos.x, pos.y, {1 << guecs::ModBit::right});
        }
      }
    }

    slides.render(window);
    window.display();
  }
}