#include "autowalker.hpp"
#include "inventory.hpp"
#include "ai.hpp"

template<typename Comp>
int number_left(gui::FSM& fsm) {
  int count = 0;

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

  return count;
}

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

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

  fsm.$level.world->query<components::Position>(
  [&](const auto ent, auto& position) {
      if(ent != fsm.$level.player) {
        if(fsm.$level.world->has<Comp>(ent)) {
          paths.set_target(position.location);
        } else {
          // this will mark that spot as a wall so we don't path there temporarily
          walls_copy[position.location.y][position.location.x] = WALL_PATH_LIMIT;
        }
      }
  });

  paths.compute_paths(walls_copy);

  return paths;
}

void Autowalker::log(std::string msg) {
  fmt::println(">>> AUTOWALK: {}", msg);
  fsm.$status_ui.log(msg);
}

void Autowalker::status(std::string 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>(fsm);
}

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

Pathing Autowalker::path_to_devices() {
  return compute_paths<components::Device>(fsm);
}


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

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);;
    }
  }
}

Point Autowalker::get_current_position() {
  auto& player_position = fsm.$level.world->get<components::Position>(fsm.$level.player);
  return player_position.location;
}

bool Autowalker::path_player(Pathing& paths, Point& target_out) {
  bool found = paths.random_walk(target_out, false, PATHING_TOWARD);

  if(!found) {
    // failed to find a linear path, try diagonal
    if(!paths.random_walk(target_out, false, PATHING_TOWARD, MOVE_DIAGONAL)) {
      status("PATH FAIL");
      log("Autowalk failed to find a path.");
      matrix::dump("MOVE FAIL PATHS", paths.$paths, target_out.x, target_out.y);
      return false;
    }
  }

  if(!fsm.$level.map->can_move(target_out)) {
    status("PATH FAIL");
    log("Autowalk major pathing failure. You can move now.");
    matrix::dump("BAD TARGET PATHS", paths.$paths, target_out.x, target_out.y);
    matrix::dump("BAD TARGET MAP", fsm.$level.map->walls(), target_out.x, target_out.y);
    return false;
  }

  return true;
}

void Autowalker::rotate_player(Point current, Point target) {
  int delta_x = int(target.x) - int(current.x);
  int delta_y = int(target.y) - int(current.y);

  int facing = fsm.$main_ui.$compass_dir;
  int target_facing = 0;

  /* This is a massive pile of garbage. Need a way
   * to determine player facing direction without
   * hacking into the compass, and also do accurate
   * turns.
   */
  if(delta_x == -1 && delta_y == 0) {
    // west
    target_facing = 4;
  } else if(delta_x == 1 && delta_y == 0) {
    // east
    target_facing = 0;
  } else if(delta_x == 0 && delta_y == 1) {
    // south
    target_facing = 2;
  } else if(delta_x == 0 && delta_y == -1) {
    // north
    target_facing = 6;
  } else if(delta_x == 1 && delta_y == -1) {
    // north east
    target_facing = 7;
  } else if(delta_x == 1 && delta_y == 1) {
    // south east
    target_facing = 1;
  } else if(delta_x == -1 && delta_y == 1) {
    // south west
    target_facing = 3;
  } else if(delta_x == -1 && delta_y == -1) {
    // north west
    target_facing = 5;
  } else {
    dbc::sentinel(
        fmt::format("got more than 8 direction result: "
          "current={},{} "
          "target={},{} "
          "delta={},{} ",
          current.x, current.y,
          target.x, target.y,
          delta_x, delta_y));
  }

  auto dir = facing > target_facing ? gui::Event::ROTATE_LEFT : gui::Event::ROTATE_RIGHT;

  while(facing != target_facing) {
    send_event(dir);
    facing = fsm.$main_ui.$compass_dir;
  }

  dbc::check(fsm.$main_ui.$compass_dir == target_facing,
      "player isn't facing the correct direction");
}

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

  int move_attempts = 0;

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

  do {
    int enemy_count = number_left<components::Combat>(fsm);
    int item_count = number_left<components::InventoryItem>(fsm);

    window_events();
    ai::set(start, "no_more_enemies", enemy_count == 0);
    ai::set(start, "no_more_items", item_count == 0);
    ai::set(start, "enemy_found",
        fsm.in_state(gui::State::IN_COMBAT) ||
        fsm.in_state(gui::State::ATTACKING));
    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));
    ai::set(start, "have_item", player_item_count() > 0);

    auto a_plan = ai::plan("Walker::actions", start, goal);

    // need a test for plan complete and only action is END
    for(auto action : a_plan.script) {
      if(action.name == "find_enemy") {
        // this is where to test if enemy found and update state
        status("FINDING ENEMY");
        auto paths = path_to_enemies();
        process_move(paths);
        send_event(gui::Event::ATTACK);
      } else if(action.name == "use_item") {
        status("USE ITEMS");
      } else if(action.name == "kill_enemy") {
        status("KILLING ENEMY");
        process_combat();
      } else if(action.name == "find_healing") {
        status("FINDING HEALING");
        auto paths = path_to_items();
        process_move(paths);
        // do the path to healing thing
      } else if(action.name == "collect_items") {
        status("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("Autowalk done, nothing left to do.");
        fsm.autowalking = false;
      } else {
        close_status();
        log("Autowalk has a bug. Unknown action.");
        fmt::println("Unknown action: {}", action.name);
      }

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

void Autowalker::process_move(Pathing& paths) {
  Point current = get_current_position();
  Point target = current;

  if(!path_player(paths, target)) {
    close_status();
    log("No paths found, aborting autowalk. You can move now.");
    fsm.autowalking = false;
    return;
  }

  rotate_player(current, target);
  while(fsm.in_state(gui::State::ROTATING)) send_event(gui::Event::TICK);

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

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

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

int Autowalker::player_item_count() {
  auto inventory = fsm.$level.world->get<components::Inventory>(fsm.$level.player);
  return inventory.count();
}

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