#include "autowalker.hpp"
#include "ai_debug.hpp"
#include "gui/ritual_ui.hpp"
#include "game_level.hpp"
#define DEBUG

struct InventoryStats {
  int healing = 0;
  int other = 0;
};

template<typename Comp>
int number_left() {
  int count = 0;
  auto world = GameDB::current_world();
  auto player = GameDB::the_player();

  world->query<components::Position, Comp>(
    [&](const auto ent, auto&, auto&) {
        if(ent != player) {
          count++;
        }
    });

  return count;
}


template<typename Comp>
Pathing compute_paths() {
  auto& level = GameDB::current_level();
  auto& walls_original = level.map->$walls;
  auto walls_copy = walls_original;

  Pathing paths{matrix::width(walls_copy), matrix::height(walls_copy)};

  // first, put everything of this type as a target
  level.world->query<components::Position, Comp>(
    [&](const auto ent, auto& position, auto&) {
      if(ent != level.player) {
        paths.set_target(position.location);
      }
  });

  level.world->query<components::Collision>(
    [&](const auto ent, auto& collision) {
      if(collision.has) {
        auto& pos = level.world->get<components::Position>(ent);
        walls_copy[pos.location.y][pos.location.x] = WALL_VALUE;
      }
  });

  paths.compute_paths(walls_copy);

  auto pos = GameDB::player_position().location;
  matrix::dump("compute_paths walls", walls_copy, pos.x, pos.y);
  matrix::dump("compute_paths input", paths.$input, pos.x, pos.y);
  matrix::dump("compute_paths paths", paths.$paths, pos.x, pos.y);

  return paths;
}

DinkyECS::Entity Autowalker::camera_aim() {
  auto& level = GameDB::current_level();
  // what happens if there's two things at that spot
  if(level.collision->something_there(fsm.$main_ui.$rayview->aiming_at)) {
    return level.collision->get(fsm.$main_ui.$rayview->aiming_at);
  } else {
    return DinkyECS::NONE;
  }
}

void Autowalker::log(std::wstring msg) {
  fsm.$map_ui.log(msg);
}

void Autowalker::status(std::wstring msg) {
  fsm.$main_ui.$overlay_ui.show_text("bottom", msg);
}

void Autowalker::close_status() {
  fsm.$main_ui.$overlay_ui.close_text("bottom");
}

Pathing Autowalker::path_to_enemies() {
  return compute_paths<components::Combat>();
}

Pathing Autowalker::path_to_items() {
  return compute_paths<components::InventoryItem>();
}

void Autowalker::handle_window_events() {
  fsm.$window.handleEvents(
      [&](const sf::Event::KeyPressed &) {
        fsm.autowalking = false;
        close_status();
        log(L"Aborting autowalk.");
      },
      [&](const sf::Event::MouseButtonPressed &) {
        fsm.autowalking = false;
        close_status();
        log(L"Aborting autowalk.");
      }
  );
}

void Autowalker::process_combat() {
  while(fsm.in_state(gui::State::IN_COMBAT)
      || fsm.in_state(gui::State::ATTACKING))
  {
    if(fsm.in_state(gui::State::ATTACKING)) {
      send_event(gui::Event::TICK);
    } else {
      send_event(gui::Event::ATTACK);
    }
  }
}

void Autowalker::path_fail(const std::string& msg, Matrix& bad_paths, Point pos) {
  status(L"PATH FAIL");
#ifdef DEBUG
  matrix::dump("MOVE FAIL PATHS", bad_paths, pos.x, pos.y);
  dbc::sentinel(fmt::format("[{}]: Autowalk failed to find a path.", msg));
#else
  log(L"Autowalk failed to find a path.");
  (void)bad_paths; // shutup compiler errors
  (void)pos;
  (void)msg;
  send_event(gui::Event::STAIRS_DOWN);
#endif
}

bool Autowalker::path_player(Pathing& paths, Point& target_out) {
  auto &level = GameDB::current_level();
  auto found = paths.find_path(target_out, PATHING_TOWARD, false);

  if(found == PathingResult::FAIL) {
    // failed to find a linear path, try diagonal
    if(paths.find_path(target_out, PATHING_TOWARD, true) == PathingResult::FAIL) {
      path_fail("random_walk", paths.$paths, target_out);
      return false;
    }
  }

  if(!level.map->can_move(target_out)) {
    fmt::println("----- FAIL MAP IS, cell is {}", paths.$paths[target_out.y][target_out.x]);
    level.map->dump(target_out.x, target_out.y);
    path_fail("level_map->can_move", paths.$paths, target_out);
    return false;
  }

  return true;
}

void Autowalker::rotate_player(Point target) {
  // auto dir = facing > target_facing ? gui::Event::ROTATE_LEFT : gui::Event::ROTATE_RIGHT;
  auto dir = gui::Event::ROTATE_LEFT;

  fmt::println("ROTATE TO: {},{} aim is {},{}",
      target.x, target.y, rayview->aiming_at.x, rayview->aiming_at.y);

  while(rayview->aiming_at != target) {
    send_event(dir);
    while(fsm.in_state(gui::State::ROTATING)) send_event(gui::Event::TICK);
  }

  dbc::check(rayview->aiming_at == target, "failed to aim at target");
}

ai::State Autowalker::update_state(ai::State start) {
  int enemy_count = number_left<components::Combat>();
  int item_count = number_left<components::InventoryItem>();

  ai::set(start, "no_more_enemies", enemy_count == 0);
  ai::set(start, "no_more_items", item_count == 0);

  // BUG: so isn't this wrong? we "find" an enemy when we are aiming at one
  ai::set(start, "enemy_found", found_enemy());

  ai::set(start, "health_good", player_health_good());

  ai::set(start, "in_combat",
      fsm.in_state(gui::State::IN_COMBAT) ||
      fsm.in_state(gui::State::ATTACKING));

  auto inv = player_item_count();
  ai::set(start, "have_item", inv.other > 0 || inv.healing > 0);
  ai::set(start, "have_healing", inv.healing > 0);

  return start;
}

void Autowalker::handle_boss_fight() {
  // skip the boss fight for now
  if(fsm.in_state(gui::State::NEXT_LEVEL)) {
    // eventually we'll have AI handle this too
    send_event(gui::Event::STAIRS_DOWN);
  }
}

void Autowalker::handle_player_walk(ai::State& start, ai::State& goal) {
  start = update_state(start);
  auto a_plan = ai::plan("Host::actions", start, goal);
  auto action = a_plan.script.front();
  ai::dump_script("AUTOWALK", start, a_plan.script);

  if(action.name == "find_enemy") {
    status(L"FINDING ENEMY");
    auto paths = path_to_enemies();
    process_move(paths);
    face_enemy();
  } else if(action.name == "face_enemy") {
    face_enemy();
  } else if(action.name == "kill_enemy") {
    status(L"KILLING ENEMY");

    if(fsm.in_state(gui::State::IN_COMBAT)) {
      if(face_enemy()) {
        process_combat();
      }
    }
  } else if(action.name == "use_healing") {
    status(L"USING HEALING");
    player_use_healing();
  } else if(action.name == "collect_items") {
    status(L"COLLECTING ITEMS");
    auto paths = path_to_items();
    process_move(paths);
    // path to the items and get them all
  } else if(action == ai::FINAL_ACTION) {
    close_status();
    log(L"FINAL ACTION! Autowalk done.");
    fsm.autowalking = false;
  } else {
    close_status();
    dbc::log(fmt::format("Unknown action: {}", action.name));
  }
}

void Autowalker::craft_weapon() {
  if(!weapon_crafted) {
    auto& ritual_ui = fsm.$status_ui.$ritual_ui;
    fsm.$status_ui.$gui.click_on("ritual_ui");

    while(!ritual_ui.in_state(gui::ritual::State::OPENED)) {
      send_event(gui::Event::TICK);
    }

    ritual_ui.$gui.click_on("inv_slot0");
    send_event(gui::Event::TICK);
    ritual_ui.$gui.click_on("inv_slot1");
    send_event(gui::Event::TICK);

    while(!ritual_ui.in_state(gui::ritual::State::CRAFTING)) {
      send_event(gui::Event::TICK);
    }

    ritual_ui.$gui.click_on("result_image", true);
    send_event(gui::Event::TICK);

    ritual_ui.$gui.click_on("ritual_ui");
    send_event(gui::Event::TICK);
    weapon_crafted = true;
  }
}

void Autowalker::open_map() {
  if(map_opened_once) return;

  if(!fsm.$map_open) {
    send_event(gui::Event::MAP_OPEN);
    map_opened_once = true;
  }
}


void Autowalker::autowalk() {
  handle_window_events();
  if(!fsm.autowalking) {
    close_status();
    return;
  }

  craft_weapon();
  open_map();

  int move_attempts = 0;

  auto start = ai::load_state("Host::initial_state");
  auto goal = ai::load_state("Host::final_state");

  do {
    handle_window_events();
    handle_boss_fight();
    handle_player_walk(start, goal);

    if(map_opened_once && move_attempts > 20) send_event(gui::Event::MAP_OPEN);

    move_attempts++;
  } while(move_attempts < 100 && fsm.autowalking);
}

void Autowalker::process_move(Pathing& paths) {
  auto world = GameDB::current_world();
  // target has to start at the player location then...
  auto target = GameDB::player_position().location;

  // ... target gets modified as an out parameter to find the path
  if(!path_player(paths, target)) {
    close_status();
    log(L"No paths found, aborting autowalk.");
    return;
  }

  if(rayview->aiming_at != target) rotate_player(target);

  send_event(gui::Event::MOVE_FORWARD);

  while(fsm.in_state(gui::State::MOVING)) send_event(gui::Event::TICK);
}

bool Autowalker::found_enemy() {
  auto world = GameDB::current_world();
  auto aimed_at = camera_aim();
  return aimed_at != DinkyECS::NONE && world->has<components::Combat>(aimed_at);
}

bool Autowalker::found_item() {
  auto world = GameDB::current_world();
  auto aimed_at = camera_aim();
  return aimed_at != DinkyECS::NONE && world->has<components::InventoryItem>(aimed_at);
}

void Autowalker::send_event(gui::Event ev) {
  fsm.event(ev);
  fsm.render();
  fsm.handle_world_events();
}

bool Autowalker::player_health_good() {
  auto world = GameDB::current_world();
  auto player = GameDB::the_player();
  auto combat = world->get<components::Combat>(player);
  return float(combat.hp) / float(combat.max_hp) > 0.5f;
}

InventoryStats Autowalker::player_item_count() {
  InventoryStats stats;
  stats.healing = 0;
  return stats;
}

void Autowalker::player_use_healing() {
}

void Autowalker::start_autowalk() {
  fsm.autowalking = true;
}

bool Autowalker::face_enemy() {
  auto& level = GameDB::current_level();
  auto player_at = GameDB::player_position();

  auto [found, neighbors] = level.collision->neighbors(player_at.location, true);

  if(found) {
    fmt::println("FOUND ENEMIES:");
    for(auto& ent : neighbors) {
      auto enemy_pos = level.world->get<components::Position>(ent);
      fmt::println("\t{}={},{}", ent, enemy_pos.location.x, enemy_pos.location.y);
    }

    auto enemy_pos = level.world->get<components::Position>(neighbors[0]);
    if(rayview->aiming_at != enemy_pos.location) rotate_player(enemy_pos.location);
  } else {
    dbc::log("No enemies nearby, moving on.");
  }

  return found;
}