package envoy.client.ui.control;

import java.awt.Toolkit;
import java.awt.datatransfer.StringSelection;
import java.io.*;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Map;
import java.util.logging.*;

import javafx.geometry.*;
import javafx.scene.control.*;
import javafx.scene.image.*;
import javafx.scene.layout.*;
import javafx.stage.FileChooser;

import envoy.client.data.*;
import envoy.client.ui.*;
import envoy.client.util.IconUtil;
import envoy.data.*;
import envoy.data.Message.MessageStatus;
import envoy.util.EnvoyLog;

/**
 * This class transforms a single {@link Message} into a UI component.
 *
 * @author Leon Hofmeister
 * @author Maximilian Käfer
 * @since Envoy Client v0.1-beta
 */
public final class MessageControl extends Label {

	private final boolean ownMessage;

	private final LocalDB		localDB			= Context.getInstance().getLocalDB();
	private final SceneContext	sceneContext	= Context.getInstance().getSceneContext();

	private static final DateTimeFormatter			dateFormat		= DateTimeFormatter.ofPattern("dd.MM.yyyy HH:mm:ss")
		.withZone(ZoneId.systemDefault());
	private static final Map<MessageStatus, Image>	statusImages	= IconUtil.loadByEnum(MessageStatus.class, 16);
	private static final Settings					settings		= Settings.getInstance();
	private static final Logger						logger			= EnvoyLog.getLogger(MessageControl.class);

	/**
	 *
	 * @param message the message that should be formatted
	 * @since Envoy Client v0.1-beta
	 */
	public MessageControl(Message message) {
		// Creating the underlying VBox and the dateLabel
		final var hbox = new HBox();
		if (message.getSenderID() != localDB.getUser().getID() && message instanceof GroupMessage) {
			// Displaying the name of the sender in a group
			final var label = new Label();
			label.getStyleClass().add("group-member-names");
			label.setText(localDB.getUsers()
				.values()
				.stream()
				.filter(c -> c.getID() == message.getSenderID())
				.findFirst()
				.map(User::getName)
				.orElse("Unknown User"));
			label.setPadding(new Insets(0, 5, 0, 0));
			hbox.getChildren().add(label);
		}
		hbox.getChildren().add(new Label(dateFormat.format(message.getCreationDate())));
		final var vbox = new VBox(hbox);

		// Creating the actions for the MenuItems
		final var	contextMenu		= new ContextMenu();
		final var	copyMenuItem	= new MenuItem("Copy");
		final var	deleteMenuItem	= new MenuItem("Delete");
		final var	forwardMenuItem	= new MenuItem("Forward");
		final var	quoteMenuItem	= new MenuItem("Quote");
		final var	infoMenuItem	= new MenuItem("Info");
		copyMenuItem.setOnAction(e -> copyMessage(message));
		deleteMenuItem.setOnAction(e -> deleteMessage(message));
		forwardMenuItem.setOnAction(e -> forwardMessage(message));
		quoteMenuItem.setOnAction(e -> quoteMessage(message));
		infoMenuItem.setOnAction(e -> loadMessageInfoScene(message));
		contextMenu.getItems().addAll(copyMenuItem, deleteMenuItem, forwardMenuItem, quoteMenuItem, infoMenuItem);

		// Handling message attachment display
		// TODO: Add missing attachment types
		if (message.hasAttachment()) {
			switch (message.getAttachment().getType()) {
				case PICTURE:
					vbox.getChildren()
						.add(new ImageView(new Image(new ByteArrayInputStream(message.getAttachment().getData()), 256, 256, true, true)));
					break;
				case VIDEO:
					break;
				case VOICE:
					vbox.getChildren().add(new AudioControl(message.getAttachment().getData()));
					break;
				case DOCUMENT:
					break;
			}
			final var saveAttachment = new MenuItem("Save attachment");
			saveAttachment.setOnAction(e -> saveAttachment(message));
			contextMenu.getItems().add(saveAttachment);
		}
		// Creating the textLabel
		final var textLabel = new Label(message.getText());
		textLabel.setMaxWidth(430);
		textLabel.setWrapText(true);
		final var hBoxBottom = new HBox();
		hBoxBottom.getChildren().add(textLabel);
		// Setting the message status icon and background color
		if (message.getSenderID() == localDB.getUser().getID()) {
			final var statusIcon = new ImageView(statusImages.get(message.getStatus()));
			statusIcon.setPreserveRatio(true);
			final var space = new Region();
			HBox.setHgrow(space, Priority.ALWAYS);
			hBoxBottom.getChildren().add(space);
			hBoxBottom.getChildren().add(statusIcon);
			hBoxBottom.setAlignment(Pos.BOTTOM_RIGHT);
			getStyleClass().add("own-message");
			ownMessage = true;
			hbox.setAlignment(Pos.CENTER_RIGHT);
		} else {
			getStyleClass().add("received-message");
			ownMessage = false;
		}
		vbox.getChildren().add(hBoxBottom);
		// Adjusting height and weight of the cell to the corresponding ListView
		paddingProperty().setValue(new Insets(5, 20, 5, 20));
		setContextMenu(contextMenu);
		setGraphic(vbox);
	}

	// Context Menu actions

	private void copyMessage(Message message) {
		Toolkit.getDefaultToolkit().getSystemClipboard().setContents(new StringSelection(message.getText()), null);
	}

	private void deleteMessage(Message message) { logger.log(Level.FINEST, "message deletion was requested for " + message); }

	private void forwardMessage(Message message) { logger.log(Level.FINEST, "message forwarding was requested for " + message); }

	private void quoteMessage(Message message) { logger.log(Level.FINEST, "message quotation was requested for " + message); }

	private void loadMessageInfoScene(Message message) { logger.log(Level.FINEST, "message info scene was requested for " + message); }

	private void saveAttachment(Message message) {
		File		file;
		final var	fileName			= message.getAttachment().getName();
		final var	downloadLocation	= settings.getDownloadLocation();
		// Show save file dialog, if the user did not opt-out
		if (!settings.isDownloadSavedWithoutAsking()) {
			final var fileChooser = new FileChooser();
			fileChooser.setInitialFileName(fileName);
			fileChooser.setInitialDirectory(downloadLocation);
			file = fileChooser.showSaveDialog(sceneContext.getStage());
		} else file = new File(downloadLocation, fileName);

		// A file was selected
		if (file != null) try (FileOutputStream fos = new FileOutputStream(file)) {
			fos.write(message.getAttachment().getData());
			logger.log(Level.FINE, "Attachment of message was saved at " + file.getAbsolutePath());
		} catch (final IOException e) {
			logger.log(Level.WARNING, "Could not save attachment of " + message + ": ", e);
		}
	}

	/**
	 * @return whether the message stored by this {@code MessageControl} has been
	 *         sent by this user of Envoy
	 * @since Envoy Client v0.1-beta
	 */
	public boolean isOwnMessage() { return ownMessage; }
}