package application.gui;

import javafx.beans.value.ChangeListener;
import javafx.geometry.HPos;
import javafx.geometry.Insets;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.control.TextArea;
import javafx.scene.layout.GridPane;

import java.time.format.DateTimeFormatter;

import application.controller.Controller;
import application.model.*;

/**
 * Registration Pane to manage registrations
 *
 * @author Mads, Mikkel & Soeren
 *
 */
public class RegistrationPane extends GridPane {
	// Attributes
	private static ListView<Conference> lwConferences = new ListView<>();
	private static ListView<Registration> lwRegistrations = new ListView<>();
	private static TextArea txaInfo = new TextArea();
	private static Label lblErrorConference = new Label();
	private static Label lblErrorRegistration = new Label();
	private Label lblConference = new Label("Aktiv Konferenceliste");
	private Label lblRegistrations = new Label("Deltagerliste");
	private Label lblRegistrationInformation = new Label("Deltager Information");
	private Button btnMakeRegistration = new Button("Tilmeld deltager");
	private Button btnRemoveRegistration = new Button("Fjern deltager");

	public RegistrationPane() {

		this.setPadding(new Insets(20));
		this.setHgap(20);
		this.setVgap(20);
		this.setGridLinesVisible(false);
		// Labels added to pane
		this.add(lblConference, 0, 0);
		lblConference.setStyle("-fx-font-weight: bold");
		GridPane.setHalignment(lblConference, HPos.CENTER);
		this.add(lblRegistrations, 1, 0);
		lblRegistrations.setStyle("-fx-font-weight: bold");
		GridPane.setHalignment(lblRegistrations, HPos.CENTER);
		this.add(lblRegistrationInformation, 2, 0);
		lblRegistrationInformation.setStyle("-fx-font-weight: bold");
		GridPane.setHalignment(lblRegistrationInformation, HPos.CENTER);
		// ListViews added to pane
		this.add(lwConferences, 0, 1);
		this.add(lwRegistrations, 1, 1);
		// TextArea with registration information added to pane
		this.add(txaInfo, 2, 1);
		txaInfo.setPrefWidth(200);
		txaInfo.setEditable(false);
		// Buttons added to pane
		this.add(btnMakeRegistration, 0, 2);
		GridPane.setHalignment(btnMakeRegistration, HPos.CENTER);
		this.add(btnRemoveRegistration, 1, 2);
		GridPane.setHalignment(btnRemoveRegistration, HPos.CENTER);
		// Error labels added to pane
		this.add(lblErrorConference, 0, 3);
		lblErrorConference.setStyle("-fx-text-fill: red");
		GridPane.setHalignment(lblErrorConference, HPos.CENTER);
		this.add(lblErrorRegistration, 1, 3);
		lblErrorRegistration.setStyle("-fx-text-fill: red");
		GridPane.setHalignment(lblErrorRegistration, HPos.CENTER);

		// Listener for updating the associated registrations
		ChangeListener<Conference> listenerConference = (ov, oldConference, newConference) -> this
				.selectedConferenceChanged();
		lwConferences.getSelectionModel().selectedItemProperty().addListener(listenerConference);
		// Listener for updating the participant information per registration
		ChangeListener<Registration> listenerRegistration = (ov, oldExcursion, newExcursion) -> this
				.selectedRegistrationChanged();
		lwRegistrations.getSelectionModel().selectedItemProperty().addListener(listenerRegistration);
		// Button actions when clicked
		btnMakeRegistration.setOnAction(e -> createRegistration());
		btnRemoveRegistration.setOnAction(e -> deleteRegistration());
		// Places the initialized Storage content to the ListViews and preselects no. 1
		// conference
		lwConferences.getItems().setAll(Controller.getActiveConferences());
		if (lwConferences.getItems().size() > 0) {
			lwConferences.getSelectionModel().select(0);
		}
	}

	// ------------------------------------------------------------------------------

	/**
	 * Creates a PopUp window which allows registration creation.
	 */
	public void createRegistration() {
		Conference conference = lwConferences.getSelectionModel().getSelectedItem();
		if (lwConferences.getItems().size() == 0) {
			removeErrorText();
			lwRegistrations.getItems().clear();
			lblErrorConference.setText("Opret først en konference");
			return;
		} else if (conference.equals(null)) {
			removeErrorText();
			lblErrorConference.setText("Vælg en konference");
			return;
		} else {
			CreateRegistrationWindow p = new CreateRegistrationWindow(conference);
			p.showAndWait();
			int selectIndexConference = lwConferences.getSelectionModel().getSelectedIndex();
			ConferencePane.updatePanes();
			lwConferences.getSelectionModel().select(selectIndexConference);
		}
	}

	/**
	 * Deletes a registration from the chosen conference
	 */
	private void deleteRegistration() {
		Conference conference = lwConferences.getSelectionModel().getSelectedItem();
		Registration registration = lwRegistrations.getSelectionModel().getSelectedItem();
		if (lwConferences.getItems().size() == 0) {
			removeErrorText();
			lblErrorConference.setText("Opret først en konference");
			return;
		} else if (conference.equals(null)) {
			removeErrorText();
			lblErrorConference.setText("Vælg en konference");
			return;
		}
		if (lwRegistrations.getItems().size() == 0) {
			removeErrorText();
			lblErrorRegistration.setText("Ingen tilmeldt " + conference.getName());
			return;
		} else if (registration != null) {
			Controller.removeRegistration(conference, registration);
			removeErrorText();
			int selectIndexConference = lwConferences.getSelectionModel().getSelectedIndex();
			ConferencePane.updatePanes();
			lwConferences.getSelectionModel().select(selectIndexConference);
			if (lwRegistrations.getItems().size() > 0) {
				lwRegistrations.getSelectionModel().select(0);
			}
		} else {
			removeErrorText();
			lblErrorRegistration.setText("Vælg en registrering");
			return;
		}
	}

	// ------------------------------------------------------------------------------

	/**
	 * The first Listener from the constructor calls this method after a new
	 * conference has been selected.
	 */
	public void selectedConferenceChanged() {
		RegistrationPane.updateRegistrations();
	}

	/**
	 * The second Listener from the constructor calls this method after a new
	 * registration is selected
	 */
	public void selectedRegistrationChanged() {
		RegistrationPane.updateInformation();
	}

	/**
	 * Helper method to update the pane (Used in the ConferencePane to update after
	 * conference creation)
	 */
	public static void updateRegistrationPane() {
		lwConferences.getItems().setAll(Controller.getActiveConferences());
		updateRegistrations();
		if (lwConferences.getItems().size() > 0) {
			lwConferences.getSelectionModel().select(0);
		}
	}

	/**
	 * Helper method to update ListViews when a new conference is selected.
	 */
	public static void updateRegistrations() {
		Conference conference = lwConferences.getSelectionModel().getSelectedItem();
		if (conference != null) {
			lwRegistrations.getItems().setAll(conference.getRegistrations());
		} else {
			lwRegistrations.getItems().clear();
		}
	}

	/**
	 * Helper method to update TextArea when a new registration is selected.
	 */
	public static void updateInformation() {
		Registration registration = lwRegistrations.getSelectionModel().getSelectedItem();
		if (registration != null) {
			StringBuilder sb = new StringBuilder();
			String dateArrival = DateTimeFormatter.ofPattern("d/M-yy")
					.format(registration.getParticipant().getArrivalDate());
			String dateDeparture = DateTimeFormatter.ofPattern("d/M-yy")
					.format(registration.getParticipant().getDepartureDate());
			if (registration.getAttendant().isEmpty()) {
				sb.append(String.format(
						"Navn: %s\nAdresse: %s\nBy: %s\nLand: %s\nAnkomst: %s\nAfgang: %s\nNummer: %d\nFirma: %s\nFirma nr.: %d\n",
						registration.getParticipant().getName(), registration.getParticipant().getAddress(),
						registration.getParticipant().getTown(), registration.getParticipant().getCountry(),
						dateArrival, dateDeparture, registration.getParticipant().getPhoneNo(),
						registration.getParticipant().getCompany(), registration.getParticipant().getCompanyPhoneNo()));
			} else {
				sb.append(String.format(
						"Navn: %s\nLedsager: %s\nAdresse: %s\nBy: %s\nLand: %s\nAnkomst: %s\nAfgang: %s\nNummer: %d\nFirma: %s\nFirma nr.: %d\n",
						registration.getParticipant().getName(), registration.getAttendant(),
						registration.getParticipant().getAddress(), registration.getParticipant().getTown(),
						registration.getParticipant().getCountry(), dateArrival, dateDeparture,
						registration.getParticipant().getPhoneNo(), registration.getParticipant().getCompany(),
						registration.getParticipant().getCompanyPhoneNo()));
			}
			txaInfo.setText(sb.toString());
		}
	}

	/**
	 * Helper method removes all error texts.
	 */
	public static void removeErrorText() {
		lblErrorConference.setText("");
		lblErrorRegistration.setText("");
	}
}