/*
 * Copyright 2012 by A-SIT, Secure Information Technology Center Austria
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://joinup.ec.europa.eu/software/page/eupl
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 */
package at.asit.pdfover.gui.composites.mobilebku;

// Imports
import java.io.ByteArrayInputStream;
import java.net.URI;
import java.util.Objects;

import javax.annotation.CheckForNull;
import javax.annotation.Nullable;

import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Link;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import at.asit.pdfover.commons.Constants;
import at.asit.pdfover.commons.Messages;
import at.asit.pdfover.gui.composites.StateComposite;
import at.asit.pdfover.gui.utils.SWTUtils;
import at.asit.pdfover.gui.workflow.states.State;
import at.asit.webauthn.WebAuthN;

/**
 * Composite for displaying the QR code for the mobile BKU
 */
public class MobileBKUQRComposite extends StateComposite {

	/**
	 * SLF4J Logger instance
	 **/
	private static final Logger log = LoggerFactory.getLogger(MobileBKUQRComposite.class);

	private Label lblQR;

	private boolean userCancelClicked = false;
	private boolean userSMSClicked = false;
	private boolean userFIDO2Clicked = false;
	private boolean pollingDone = false;

	private Label lblRefVal;

	private String refVal;

	private ImageData currentQRImage;

	private URI signatureDataURI;

	private Label lblError;
	private Label lblRefValLabel;
	private Label lblQRLabel;

	private Button btn_fido2;
	private Button btn_sms;
	private Button btn_cancel;

	private Link lnk_sig_data;

	public void signalPollingDone() { this.pollingDone = true; getDisplay().wake(); }
	public boolean isDone() { return (this.userCancelClicked || this.userSMSClicked || this.userFIDO2Clicked || this.pollingDone); }
	public boolean wasCancelClicked() { return this.userCancelClicked; }
	public boolean wasSMSClicked() { return this.userSMSClicked; }
	public boolean wasFIDO2Clicked() { return this.userFIDO2Clicked; }
	public void reset() { this.userCancelClicked = this.userSMSClicked = this.userFIDO2Clicked = this.pollingDone = false; }

	/**
	 * Set an error message
	 * @param errorMessage the error message
	 */
	public void setErrorMessage(String errorMessage) {
		if (errorMessage == null)
			this.lblError.setText("");
		else
			this.lblError.setText(
					Messages.getString("error.Title") + ": " + errorMessage);
	}

	public String getRefVal() { return this.refVal; }
	public void setRefVal(@CheckForNull String refVal) {
		this.refVal = (refVal != null) ? refVal.trim() : null;
		this.lblRefVal.setText(Objects.requireNonNullElse(this.refVal, ""));
	}

	private void updateQRImage() {
		if (this.currentQRImage == null)
			return;

		Point availableSize = this.lblQR.getSize();
		int targetSize = Math.min(availableSize.x, availableSize.y);
		if (targetSize <= 0)
			return;
		
		this.lblQR.setImage(new Image(this.lblQR.getDisplay(), this.currentQRImage.scaledTo(targetSize, targetSize)));
	}

	/**
	 * @param qrcode
	 *            the qrcode to set
	 */
	public void setQR(byte[] qrcode) {
		if (qrcode == null) {
			setErrorMessage(Messages.getString("error.FailedToLoadQRCode"));
			return;
		}
		try {
			this.currentQRImage = new ImageData(new ByteArrayInputStream(qrcode));
		} catch (SWTException e) {
			log.warn("Failed to load QR code", e);
			setErrorMessage(Messages.getString("error.FailedToLoadQRCode"));
			return;
		}
		updateQRImage();
	}

	public void setSMSEnabled(boolean state) {
		this.btn_sms.setEnabled(state);
	}

	public void setFIDO2Enabled(boolean state) {
		this.btn_fido2.setEnabled(state);
	}

	public void setSignatureDataURI(@Nullable URI uri) {
		this.signatureDataURI = uri;
		this.lnk_sig_data.setVisible(uri != null);
	}

	/**
	 * Create the composite.
	 *
	 * @param parent
	 * @param style
	 * @param state
	 */
	public MobileBKUQRComposite(Composite parent, int style, State state) {
		super(parent, style, state);
		setLayout(new FormLayout());

		final Composite containerComposite = new Composite(this, SWT.NATIVE);
		SWTUtils.anchor(containerComposite).top(50, -140).bottom(50, 140).left(50, -200).right(50, 200);
		containerComposite.addPaintListener(new PaintListener() {
			@Override
			public void paintControl(PaintEvent e) {
				Rectangle clientArea = containerComposite.getClientArea();

				// e.gc.setForeground();
				e.gc.setForeground(Constants.MAINBAR_ACTIVE_BACK_DARK);
				e.gc.setLineWidth(3);
				e.gc.setLineStyle(SWT.LINE_SOLID);
				e.gc.drawRoundRectangle(clientArea.x, clientArea.y,
						clientArea.width - 2, clientArea.height - 2, 10, 10);
			}
		});
		containerComposite.setLayout(new FormLayout());

		this.lblRefValLabel = new Label(containerComposite, SWT.NATIVE);
		SWTUtils.anchor(lblRefValLabel).right(50, -10).top(30, -10);
		this.lblRefValLabel.setAlignment(SWT.RIGHT);

		ImageData mobileIcon = new ImageData(this.getClass().getResourceAsStream(Constants.RES_IMG_MOBILE));
		Label lbl_image = new Label(containerComposite, SWT.NATIVE);
		SWTUtils.anchor(lbl_image).top(50, -1 * (mobileIcon.width / 2)).bottom(50, mobileIcon.width / 2).left(0, 10).width(mobileIcon.width);
		lbl_image.setImage(new Image(getDisplay(), mobileIcon));

		this.lblRefVal = new Label(containerComposite, SWT.NATIVE);
		SWTUtils.anchor(lblRefVal).left(50, 10).right(100, -20).top(30, -10);

		this.lblQRLabel = new Label(containerComposite, SWT.NATIVE);
		SWTUtils.anchor(lblQRLabel).right(50, -10).top(lblRefValLabel, 10);
		this.lblQRLabel.setAlignment(SWT.RIGHT);

		this.lblQR = new Label(containerComposite, SWT.NATIVE);
		this.lblQR.addListener(SWT.Resize, (e) -> { updateQRImage(); });

		this.lnk_sig_data = new Link(containerComposite, SWT.NATIVE | SWT.RESIZE);
		SWTUtils.anchor(lnk_sig_data).right(100, -20).top(0, 20);
		SWTUtils.addSelectionListener(lnk_sig_data, (e) -> { SWTUtils.openURL(this.signatureDataURI); });

		this.btn_cancel = new Button(containerComposite, SWT.NATIVE);
		SWTUtils.anchor(btn_cancel).right(100, -20).bottom(100, -5);
		SWTUtils.addSelectionListener(btn_cancel, (e) -> { this.userCancelClicked = true; });

		this.btn_sms = new Button(containerComposite, SWT.NATIVE);
		SWTUtils.anchor(btn_sms).right(btn_cancel, -20).bottom(100, -5);
		SWTUtils.addSelectionListener(btn_sms, (e) -> { this.userSMSClicked = true; });

		this.btn_fido2 = new Button(containerComposite, SWT.NATIVE);
		SWTUtils.anchor(btn_fido2).right(btn_sms, -20).bottom(100, -5);
		SWTUtils.addSelectionListener(btn_fido2, (e) -> { this.userFIDO2Clicked = true; });
		this.btn_fido2.setVisible(WebAuthN.isAvailable());

		SWTUtils.anchor(lblQR).left(50, 10).right(100, -20).top(lblRefVal, 10).bottom(btn_sms, -10);

		this.lblError = new Label(containerComposite, SWT.WRAP | SWT.NATIVE);
		SWTUtils.anchor(lblError).right(btn_sms, -10).bottom(100, -20);

		reloadResources();
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see at.asit.pdfover.gui.composites.StateComposite#reloadResources()
	 */
	@Override
	public void reloadResources() {
		SWTUtils.setLocalizedText(lblRefValLabel, "tanEnter.ReferenceValue");
		SWTUtils.setLocalizedText(lblQRLabel, "tanEnter.QR");
		SWTUtils.setLocalizedText(lnk_sig_data, "mobileBKU.show");
		SWTUtils.setLocalizedToolTipText(lnk_sig_data, "mobileBKU.show_tooltip");
		SWTUtils.setLocalizedText(btn_cancel, "common.Cancel");
		SWTUtils.setLocalizedText(btn_sms, "tanEnter.SMS");
		SWTUtils.setLocalizedText(btn_fido2, "tanEnter.FIDO2");
	}
}