#include "selected_units_model.h"
#include "../core/game_engine.h"
#include <algorithm>
#include <qabstractitemmodel.h>
#include <qhash.h>
#include <qhashfunctions.h>
#include <qobject.h>
#include <qstringview.h>
#include <qtmetamacros.h>
#include <qvariant.h>
#include <vector>

SelectedUnitsModel::SelectedUnitsModel(GameEngine *engine, QObject *parent)
    : QAbstractListModel(parent), m_engine(engine) {}

auto SelectedUnitsModel::rowCount(const QModelIndex &parent) const -> int {
  if (parent.isValid()) {
    return 0;
  }
  return static_cast<int>(m_ids.size());
}

auto SelectedUnitsModel::data(const QModelIndex &index,
                              int role) const -> QVariant {
  if (!index.isValid() || index.row() < 0 ||
      index.row() >= static_cast<int>(m_ids.size())) {
    return {};
  }
  auto id = m_ids[index.row()];
  if (m_engine == nullptr) {
    return {};
  }
  QString name;
  QString nation;
  int hp = 0;
  int max_hp = 0;
  bool is_b = false;
  bool alive = false;
  if (role == UnitIdRole) {
    return QVariant::fromValue<int>(static_cast<int>(id));
  }
  if (role == UnitTypeRole) {
    QString type_key;
    if (m_engine->get_unit_type_key(id, type_key)) {
      return type_key;
    }
    return {};
  }
  if (!m_engine->get_unit_info(id, name, hp, max_hp, is_b, alive, nation)) {
    return {};
  }
  if (role == NameRole) {
    return name;
  }
  if (role == HealthRole) {
    return hp;
  }
  if (role == max_healthRole) {
    return max_hp;
  }
  if (role == HealthRatioRole) {
    return (max_hp > 0 ? static_cast<double>(std::clamp(hp, 0, max_hp)) /
                             static_cast<double>(max_hp)
                       : 0.0);
  }
  if (role == NationRole) {
    return nation;
  }
  if (role == StaminaRatioRole || role == IsRunningRole || role == CanRunRole) {
    float stamina_ratio = 1.0F;
    bool is_running = false;
    bool can_run = false;
    m_engine->get_unit_stamina_info(id, stamina_ratio, is_running, can_run);
    if (role == StaminaRatioRole) {
      return static_cast<double>(stamina_ratio);
    }
    if (role == IsRunningRole) {
      return is_running;
    }
    if (role == CanRunRole) {
      return can_run;
    }
  }
  return {};
}

auto SelectedUnitsModel::roleNames() const -> QHash<int, QByteArray> {
  return {{UnitIdRole, "unit_id"},
          {UnitTypeRole, "unit_type"},
          {NameRole, "name"},
          {HealthRole, "health"},
          {max_healthRole, "max_health"},
          {HealthRatioRole, "health_ratio"},
          {NationRole, "nation"},
          {StaminaRatioRole, "stamina_ratio"},
          {IsRunningRole, "is_running"},
          {CanRunRole, "can_run"}};
}

void SelectedUnitsModel::refresh() {
  if (m_engine == nullptr) {
    return;
  }
  std::vector<Engine::Core::EntityID> ids;
  m_engine->get_selected_unit_ids(ids);

  if (ids.size() == m_ids.size() &&
      std::equal(ids.begin(), ids.end(), m_ids.begin())) {
    if (!m_ids.empty()) {
      QModelIndex const first = index(0, 0);
      QModelIndex const last = index(static_cast<int>(m_ids.size()) - 1, 0);
      emit dataChanged(first, last,
                       {HealthRole, max_healthRole, HealthRatioRole,
                        StaminaRatioRole, IsRunningRole});
    }
    return;
  }

  beginResetModel();

  m_ids.clear();
  for (auto id : ids) {
    QString nm;
    QString nation;
    int hp = 0;
    int max_hp = 0;
    bool is_b = false;
    bool alive = false;
    if (!m_engine->get_unit_info(id, nm, hp, max_hp, is_b, alive, nation)) {
      continue;
    }
    if (is_b) {
      continue;
    }
    if (!alive) {
      continue;
    }
    m_ids.push_back(id);
  }
  endResetModel();
}