#define FSM_DEBUG 1
#include "sound.hpp"
#include "ai.hpp"
#include "animation.hpp"
#include <iostream>
#include "shaders.hpp"
#include "backend.hpp"
#include "events.hpp"
#include "constants.hpp"
#include "gui/event_router.hpp"
#include "constants.hpp"
#include <guecs/ui.hpp>
#include "gui/event_router.hpp"
#include "gui/guecstra.hpp"
#include "animate2.hpp"

bool YES_SYNC=true;

namespace animator {
  struct UI {
    guecs::UI $ui;

    void init(const std::string& sprite_name) {
      $ui.position(0,0, SCREEN_WIDTH, SCREEN_HEIGHT);
      $ui.layout(
          "[play|*%=(300,400)viewer|_|_]"
          "[stop|_|_|_]"
          "[next|_|_|_]"
          "[prev|_|_|_]");

      for(auto& [name, cell] : $ui.cells()) {
        auto comp = $ui.entity(name);
        if(name == "viewer") {
          $ui.set<guecs::Sprite>(comp, {
              sprite_name, 0, false});
        } else {
          $ui.set<guecs::Rectangle>(comp, {});
          $ui.set<guecs::Text>(comp, {guecs::to_wstring(name)});
          $ui.set<guecs::Effect>(comp, {});
          $ui.set<guecs::Clickable>(comp, {[](auto){
              fmt::println("I don't know what to do here.");
          }});
        }
      }

      $ui.init();
    }

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

    bool mouse(float x, float y, guecs::Modifiers mods) {
      return $ui.mouse(x, y, mods);
    }
  };

  enum class State {
    START=__LINE__,
    ANIMATE=__LINE__,
    END=__LINE__,
  };

  struct FSM : public DeadSimpleFSM<State, game::Event> {
    UI $ui;
    gui::routing::Router $router;
    sf::RenderWindow $window{sf::VideoMode({SCREEN_WIDTH, SCREEN_HEIGHT}), "Animation Crafting Tool"};

    void init(const std::string &sprite_name) {
      $ui.init(sprite_name);

      if(YES_SYNC) {
        $window.setVerticalSyncEnabled(VSYNC);
        if(FRAME_LIMIT) $window.setFramerateLimit(FRAME_LIMIT);
      }

      $window.setPosition({0,0});
    }

    void event(game::Event ev, std::any data={}) {
      switch($state) {
        FSM_STATE(State, START, ev);
        FSM_STATE(State, ANIMATE, ev);
        FSM_STATE(State, END, ev);
      }
    }

    void START(game::Event ev) {
      switch(ev) {
        case game::Event::TICK:
          state(State::ANIMATE);
          break;
        default:
          state(State::START);
      }
    }

    void ANIMATE(game::Event ev) {
      switch(ev) {
        case game::Event::TICK:
          // stuff
          break;
        default:
          state(State::START);
      }
    }

    void END(game::Event ev) {
    }

    void handle_keyboard_mouse() {
      while(const auto ev = $window.pollEvent()) {
        using enum game::Event;
        auto gui_ev = $router.process_event(ev);
        auto mouse_pos = $window.mapPixelToCoords($router.position);

        switch(gui_ev) {
          case MOUSE_CLICK:
            $ui.mouse(mouse_pos.x, mouse_pos.y, guecs::NO_MODS);
            break;
          case MOUSE_MOVE:
            $ui.mouse(mouse_pos.x, mouse_pos.y, {1 << guecs::ModBit::hover});
            break;
          case QUIT:
            state(State::END);
          default:
            break; // ignored
        }
      }
    }

    void render() {
      $window.clear();
      $ui.render($window);
      $window.display();
    }

    bool active() {
      return !in_state(State::END);
    }
  };
}

int main(int argc, char* argv[]) {
  shaders::init();
  components::init();
  sfml::Backend backend;
  guecs::init(&backend);
  ai::init("ai");
  animation::init();

  dbc::check(argc == 2, "USAGE: animator <sprite>");
  std::string sprite_name{argv[1]};

  sound::mute(true);
  sound::play("ambient_1", true);

  animator::FSM main;
  main.init(argv[1]);

  animate2::Timer timer;
  timer.start();

  while(main.active()) {
    timer.begin();
    main.render();
    auto [ticks, alpha] = timer.commit();
    fmt::println("TICK: {}, alpha: {}", ticks, alpha);

    for(int i = 0; i < ticks; i++) {
      main.event(game::Event::TICK, {});
    }

    // do something with alpha....
    main.handle_keyboard_mouse();
  }

  return 0;
}