cinema-ticket-management-system/ui/models/sessions_model.cpp

#include "sessions_model.h"

#include <QSqlError>
#include <QSqlQuery>

SessionsModel::SessionsModel(QObject *parent, const QSqlDatabase &database)
    : BaseSqlTableModel(parent, database) {}

void SessionsModel::initialize() {
  setTable("sessions");

  // Set up the relationship with the movies and halls tables
  setRelation(fieldIndex("movie_id"),
              QSqlRelation("movies", "movie_id", "title"));
  setRelation(fieldIndex("hall_id"),
              QSqlRelation("halls", "hall_id", "hall_name"));

  setEditStrategy(QSqlTableModel::OnFieldChange);

  bool success = select();
  if (!success) {
    qWarning() << "Error:" << lastError().text();
  }
}

bool SessionsModel::buildHallIdFilterCondition(const QString &inFilter,
                                               QString &outFilter) const {
  QSqlQuery query;
  query.prepare("SELECT hall_id FROM halls WHERE hall_name LIKE ?");
  query.addBindValue("%" + inFilter + "%");
  query.exec();

  QStringList hallIds;
  while (query.next()) {
    hallIds << query.value(0).toString();
  }

  if (hallIds.isEmpty()) {
    return false;
  }

  outFilter = QString("sessions.hall_id IN (%1)").arg(hallIds.join(", "));

  return true;
}

bool SessionsModel::buildMovieIdFilterCondition(const QString &inFilter,
                                                QString &outFilter) const {
  QSqlQuery query;
  query.prepare("SELECT movie_id FROM movies WHERE title LIKE ?");
  query.addBindValue("%" + inFilter + "%");
  query.exec();

  QStringList movieIds;
  while (query.next()) {
    movieIds << query.value(0).toString();
  }

  if (movieIds.isEmpty()) {
    return false;
  }

  outFilter = QString("sessions.movie_id IN (%1)").arg(movieIds.join(", "));

  return true;
}

QVariant SessionsModel::headerData(int section, Qt::Orientation orientation,
                                   int role) const {
  if (role == Qt::DisplayRole && orientation == Qt::Horizontal) {
    switch (section) {
    case SessionsColumns::Id:
      return tr("ID");
    case SessionsColumns::MovieId:
      return tr("Movie Title");
    case SessionsColumns::HallId:
      return tr("Hall Name");
    case SessionsColumns::BeginAt:
      return tr("Start Time");
    case SessionsColumns::TicketPrice:
      return tr("Ticket Price");
    default:
      return QVariant();
    }
  }
  return QSqlRelationalTableModel::headerData(section, orientation, role);
}

QString SessionsModel::createMultiColumnFilter(const QString &filter) const {
  QStringList conditions;

  QString buffer; // SessionsColumns::HallId And SessionsColumns::MovieId
  if (buildHallIdFilterCondition(filter, buffer)) {
    conditions.append(buffer);
  }
  if (buildMovieIdFilterCondition(filter, buffer)) {
    conditions.append(buffer);
  }

  // WARNING: Does not filter these models transmitted through the data method,
  // such as QDatetime

  using Columns = SessionsColumns;
  QStringList columns = {columnName(Columns::Id),
                         columnName(Columns::TicketPrice)};

#ifndef NO_DATE_TIME_SEARCH
  columns.append(columnName(Columns::BeginAt));
#endif

  for (const QString &column : columns) {
    conditions.append(QString("%1 LIKE '%%2%'").arg(column).arg(filter));
  }

  return conditions.join(" OR ");
}