ch.bfh.blue.UI.ReservationBySelectedTimeView.java Source code

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Here is the source code for ch.bfh.blue.UI.ReservationBySelectedTimeView.java

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/*
 * Copyright (c) 2016 Berner Fachhochschule, Switzerland.
 *
 * Project Smart Reservation System.
 *
 * Distributable under GPL license. See terms of license at gnu.org.
 */
package ch.bfh.blue.UI;

import java.util.Date;
import java.util.List;

import com.vaadin.data.util.BeanItemContainer;
import com.vaadin.navigator.Navigator;
import com.vaadin.navigator.View;
import com.vaadin.navigator.ViewChangeListener.ViewChangeEvent;
import com.vaadin.server.Page;
import com.vaadin.ui.Button;
import com.vaadin.ui.Component;
import com.vaadin.ui.Grid;
import com.vaadin.ui.HorizontalLayout;
import com.vaadin.ui.Label;
import com.vaadin.ui.Notification;
import com.vaadin.ui.TextField;
import com.vaadin.ui.VerticalLayout;

import ch.bfh.blue.requirements.Person;
import ch.bfh.blue.requirements.Space;
import ch.bfh.blue.service.Controller;

/**
 * After selecting a timeframe, this view will show all the available rooms for
 * this timeframe
 *
 * @author SRS-Team
 *
 */

public class ReservationBySelectedTimeView extends VerticalLayout implements View {

    /**
     *
     */
    private static final long serialVersionUID = 1L;

    private Navigator navigator;
    private Controller controller;

    // Constants
    private static final String RESERVATION_SUCCESS = "You have successfully made a reservation.";
    private static final String RESERVATION_NULL_VALUE_ERROR = "One or more Values were NULL, no reservation was made!";
    private static final String LOGIN_ERROR_NOT_LOGGED_IN = "You got redirected to the homepage, since no user was logged in.";

    // Layouts which contain components
    private final HorizontalLayout navBtnHL = new HorizontalLayout();
    private final HorizontalLayout resHL = new HorizontalLayout();
    private final VerticalLayout dateVL = new VerticalLayout();

    // Labels and Components
    // TODO Field never used.
    private String dates = new String();
    private Date startDate;
    private Date endDate;
    private final Label heading = new Label();
    private final Label startDateLabel = new Label();
    private final Label endDateLabel = new Label();
    private final Grid grid = new Grid();
    private final TextField restitle = new TextField();
    private Notification notif = new Notification("", Notification.Type.WARNING_MESSAGE);
    private List<Space> spaces;
    private boolean gridLock = false;
    private boolean titleLock = false;
    private Person currentPerson;

    // Buttons
    private final Button reservationBtn = new Button("Make reservation");
    private final Button logoutBtn = new Button("Logout");
    private final Button backBtn = new Button("Back");

    public ReservationBySelectedTimeView(Controller contr) {
        controller = contr;
        for (Component c : new Component[] { heading, grid, resHL, navBtnHL })
            this.addComponent(c);
        notif.setDelayMsec(4000);
        configureUI();
        configureButtons();
        makeReservationBtnDisabled();
    }

    /**
     * configure all the settings for the different UI components here
     */
    private void configureUI() {
        this.setSpacing(true);
        heading.setValue("Available rooms for the selected timeframe:");
        restitle.setValue("");
        restitle.setInputPrompt("Enter title");
        resHL.addComponents(restitle, reservationBtn, dateVL);
        resHL.setSpacing(true);
        dateVL.addComponents(startDateLabel, endDateLabel);
        configureGrid();
    }

    /**
     * configurations of the grid are done here
     */
    private void configureGrid() {
        grid.setWidth("300px");
        grid.setHeight("400px");
    }

    /**
     * loads free rooms from the db and refreshes the grid
     */
    private void refreshGrid() {
        spaces = controller.getSpaceOnTime(startDate, endDate);
        grid.setContainerDataSource(new BeanItemContainer<>(Space.class, spaces));
    }

    /**
     * configure handlers and settings for the buttons here
     */
    private void configureButtons() {

        reservationBtn.addClickListener(e -> {
            Person p = (Person) getSession().getAttribute("user");
            Space spc = (Space) grid.getSelectedRow();
            String t = restitle.getValue();
            if (t != null && p != null && startDate != null && endDate != null && spc != null) {
                controller.createReservation(t, p, startDate, endDate, spc);
                notif.setCaption(RESERVATION_SUCCESS + " " + restitle.getValue());
                notif.show(Page.getCurrent());
                refreshGrid();
            } else {
                notif.setCaption(RESERVATION_NULL_VALUE_ERROR);
                notif.show(Page.getCurrent());
            }

        });

        logoutBtn.addClickListener(e -> {
            navigator.navigateTo("home");
        });

        backBtn.addClickListener(e -> {
            navigator.navigateTo("availableSpaces");
        });

        navBtnHL.addComponents(backBtn, logoutBtn);
        navBtnHL.setSpacing(true);
    }

    /**
     * this method provides the function to disable the "reservationBtn" if no
     * title is written in the "title" TextField or no selection is made in the
     * grid
     */
    private void makeReservationBtnDisabled() {
        grid.addSelectionListener(ge -> {
            if (ge.getSelected().isEmpty()) {
                reservationBtn.setEnabled(false);
                gridLock = false;
            } else {
                gridLock = true;
                if (gridLock && titleLock) {
                    reservationBtn.setEnabled(true);
                }
            }
        });

        restitle.addTextChangeListener(te -> {
            if (te.getText().equals("") || te.getText().equals(null)) {
                reservationBtn.setEnabled(false);
                titleLock = false;
            } else {
                titleLock = true;
                if (gridLock && titleLock) {
                    reservationBtn.setEnabled(true);
                }
            }
        });
    }

    /**
     * checks if a user is logged in returns true if someone is logged in
     * returns false if no one is logged in
     */
    private boolean isLoggedIn() {
        currentPerson = (Person) getSession().getAttribute("user");
        System.out.println(currentPerson);
        if (currentPerson == null) {
            notif.setCaption(LOGIN_ERROR_NOT_LOGGED_IN);
            notif.show(Page.getCurrent());
            navigator.navigateTo("home");
            return false;
        }
        return true;
    }

    /**
     * called upon entering the view
     */
    @Override
    public void enter(ViewChangeEvent event) {
        navigator = event.getNavigator();
        if (isLoggedIn()) {
            startDate = (Date) getSession().getAttribute("startDate");
            endDate = (Date) getSession().getAttribute("endDate");
            refreshGrid();
            if (grid.getColumn("reservations") != null) {
                grid.removeColumn("reservations");
            }
            if (grid.getColumn("spaceNumber") != null) {
                grid.removeColumn("spaceNumber");
            }
            grid.deselectAll();
            reservationBtn.setEnabled(false);
            startDateLabel.setValue("From: " + startDate);
            endDateLabel.setValue("To: " + endDate);
        }
    }

}