#include "boss/fight.hpp"
#include "boss/system.hpp"
#include "animation.hpp"
#include "game_level.hpp"

namespace boss {
  Fight::Fight(shared_ptr<World> world, Entity boss_id, Entity player_id) :
    $world(world),
    $boss_id(boss_id),
    $battle(System::create_battle($world, $boss_id)),
    $ui(world, boss_id, player_id),
    $host(player_id)
  {
    $host_combat = $world->get_if<components::Combat>(player_id);
    dbc::check($host_combat,
        fmt::format("No combat for host with player_id={}", player_id));
    $ui.init();
  }

  bool Fight::event(gui::Event ev, std::any data) {
    // if the mouse event is handled the done, this may be wrong later
    if(handle_mouse(ev)) return in_state(State::END);

    switch($state) {
      FSM_STATE(State, START, ev, data);
      FSM_STATE(State, PLAYER_REQUESTS, ev, data);
      FSM_STATE(State, PLAN_BATTLE, ev, data);
      FSM_STATE(State, EXEC_PLAN, ev, data);
      FSM_STATE(State, END, ev, data);
    }

    run_systems();

    return in_state(State::END);
  }

  void Fight::START(gui::Event ev, std::any) {
    using enum gui::Event;

    switch(ev) {
      // this is only if using the debug X key to skip it
      case BOSS_START:
        state(State::END);
        break;
      case TICK:
        $ui.status(L"PLAYER REQUESTS");
        $battle.ap_refresh();
        state(State::PLAYER_REQUESTS);
        break;
      default:
        break;
    }
  }

  void Fight::PLAYER_REQUESTS(gui::Event ev, std::any data) {
    using enum gui::Event;

    switch(ev) {
      // this is only if using the debug X key to skip it
      case BOSS_START:
        state(State::END);
        break;
      case START_COMBAT:
        System::plan_battle($battle, $world, $boss_id);
        $ui.status(L"PLANNING BATTLE");
        state(State::PLAN_BATTLE);
        break;
      case ATTACK:
        if($battle.player_request("kill_enemy")) {
          fmt::println("player requests kill_enemy {} vs. {}",
              $host_combat->ap, $battle.player_pending_ap());
        } else {
          fmt::println("NO MORE ACTION!");
        }
        break;
      case TICK:
        break; // ignore tick
      default:
        break;
    }
  }

  void Fight::PLAN_BATTLE(gui::Event ev, std::any data) {
    using enum gui::Event;

    switch(ev) {
      // this is only if using the debug X key to skip it
      case BOSS_START:
        state(State::END);
        break;
      case START_COMBAT:
        $ui.status(L"EXEC PLAN");
        state(State::EXEC_PLAN);
        break;
      case TICK:
        break; // ignore tick
      default:
        break;
    }
  }

  void Fight::EXEC_PLAN(gui::Event ev, std::any data) {
    using enum gui::Event;

    switch(ev) {
      // this is only if using the debug X key to skip it
      case BOSS_START:
        state(State::END);
        break;
      case TICK:
      case COMBAT:
        if(auto action = $battle.next()) {
          fmt::println("COMBAT!");
          System::combat(*action, $world, $boss_id, 0);
          run_systems();
        } else {
          fmt::println("NO MORE BATTLE ACTIONS!");
        }

        if(player_dead()) {
          $ui.status(L"YOU DIED");
          state(State::END);
        } else {
          $ui.status(L"PLAYER REQUESTS");
          $battle.ap_refresh();
          $battle.clear_requests();
          state(State::PLAYER_REQUESTS);
        }
        break; // ignore tick
      default:
        break;
    }
  }

  void Fight::END(gui::Event ev, std::any) {
    fmt::println("BOSS_FIGHT:END event {}", (int)ev);
  }

  void Fight::run_systems() {
    $ui.update_stats();
    $battle.set($host, "tough_personality", false);
    $battle.set($host, "have_healing", false);
    $battle.set($host, "health_good", $host_combat->hp > 100);
  }

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

  bool Fight::handle_mouse(gui::Event ev) {
    using enum gui::Event;

    switch(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 MOUSE_DRAG:
       dbc::log("mouse drag");
       break;
      case MOUSE_DRAG_START:
       dbc::log("mouse START drag");
       break;
      case MOUSE_DROP:
       dbc::log("mouse DROP");
       break;
      default:
       return false;
    }

    // switch/default didn't happen so handled it.
    return true;
  }

  bool Fight::player_dead() {
    return $host_combat->hp <= 0;
  }

  void Fight::init_fight() {
    System::initialize_actor_ai(*$world, $boss_id);
    run_systems();
  }

  void Fight::handle_world_events() {
    fmt::println(">>>>>>>>>>>>>>>>> BOSS FIGHT EVENTS");
    dbc::check($world->has_event<Events::GUI>(), "World doesn't have GUI events.");

    while($world->has_event<Events::GUI>()) {
      auto [evt, entity, data] = $world->recv<Events::GUI>();
      fmt::println("boss fight received event", int(evt));

      switch(evt) {
        case Events::GUI::ATTACK:
          fmt::println("sending attack");
          event(gui::Event::ATTACK, data);
          break;
        case Events::GUI::COMBAT_START:
          fmt::println("sending combat start");
          event(gui::Event::START_COMBAT, data);
          break;
        case Events::GUI::COMBAT:
          fmt::println("sending combat");
          event(gui::Event::COMBAT, data);
          break;
        default:
          fmt::println("GUI EVENT: {} entity={}", int(evt), entity);
      }
    }
    dbc::check(!$world->has_event<Events::GUI>(), "World still has events!");
    fmt::println("<<<<<<<<<<<<<<<< BOSS FIGHT EVENTS");
  }
}