package gui;

import javafx.beans.value.ChangeListener;
import javafx.geometry.Insets;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.DatePicker;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import model.Hotel;
import model.Konference;
import model.Tilmelding;
import service.Service;

public class KonferencePane extends GridPane {
	// TODO Spørg margrethe om hvordan man kan få listview til at opdatere hvis
	// man laver noget
	// i en anden tab
	// TODO Hvordan man laver mutiple selections på et listview
	// TODO spørg margrethe om hvordan man håndterer removeHotelFromKonference.
	// Den vil crashe når
	// den kører metoden for anden gang pga. den ikke kan fjerne then samme
	// konference to gange.
	// TODO Spørg også om det er muligt at begrænse DatePicker til kun at virke
	// indenfor
	// konferencen's
	// tidspunkt, og hvordan man forhindrer at der er negativt antal dage.
	private TextField txfKonfId, txfPris, txfSted, txfSamletpris;
	private Label lblStart, lblSlut, lblKonfId, lblPris;
	private ListView<Konference> lvwKonferencer;
	private ListView<Tilmelding> lvwTilmeldinger;
	private DatePicker startDatoPicker, slutDatoPicker;
	private CheckBox cSamletpris;

	public KonferencePane() {
		setPadding(new Insets(20));
		setHgap(20);
		setVgap(10);
		setGridLinesVisible(false);

		cSamletpris = new CheckBox();
		cSamletpris.setText("udregn samlet pris");
		this.add(cSamletpris, 6, 1);
		cSamletpris.setDisable(true);
		cSamletpris.setOnAction(event -> {
			if (cSamletpris.isSelected()) {
				Tilmelding t = lvwTilmeldinger.getSelectionModel()
						.getSelectedItem();
				if (t != null) {

					txfSamletpris.setText(t.beregnSamletPris() + "");
				}
			}
		});

		lblStart = new Label("Start Dato:");
		this.add(lblStart, 0, 0);

		startDatoPicker = new DatePicker();
		this.add(startDatoPicker, 0, 1);

		lblSlut = new Label("Slut Dato:");
		this.add(lblSlut, 0, 2);
		slutDatoPicker = new DatePicker();
		this.add(slutDatoPicker, 0, 3);

		lblKonfId = new Label("Konferrence id:");
		this.add(lblKonfId, 0, 4);

		txfSamletpris = new TextField();
		this.add(txfSamletpris, 6, 2);
		txfSamletpris.setDisable(true);

		txfKonfId = new TextField();
		this.add(txfKonfId, 0, 5);

		lblPris = new Label("Pris:");
		this.add(lblPris, 0, 6);

		txfPris = new TextField();
		this.add(txfPris, 0, 7);

		Label lblSted = new Label("Sted:");
		this.add(lblSted, 0, 8);

		txfSted = new TextField();
		this.add(txfSted, 0, 9);

		Label lblDeltagere = new Label("Deltagere:");
		this.add(lblDeltagere, 3, 0);

		Label lblKonferencer = new Label("Konferencer:");
		this.add(lblKonferencer, 2, 0);

		lvwKonferencer = new ListView<>();
		this.add(lvwKonferencer, 2, 1, 1, 8);
		lvwKonferencer.setPrefHeight(200);
		lvwKonferencer.setPrefWidth(200);

		lvwTilmeldinger = new ListView<>();
		this.add(lvwTilmeldinger, 3, 1, 1, 8);
		lvwTilmeldinger.setPrefHeight(200);
		lvwTilmeldinger.setPrefWidth(200);

		ChangeListener<Tilmelding> tilmeldingListener = (ov, oldTilmelding,
				newTilmelding) -> aktiverPris();
		lvwTilmeldinger.getSelectionModel().selectedItemProperty()
				.addListener(tilmeldingListener);

		/*
		 * Updates the listview of konferences upon initialization, othervise it
		 * will be empty until a new konference is created
		 */
		lvwKonferencer.getItems().setAll(Service.getKonferencer());

		ChangeListener<Konference> konfListener = (ov, oldKonference,
				newKonference) -> updateControls();
		lvwKonferencer.getSelectionModel().selectedItemProperty()
				.addListener(konfListener);

		Button btnAdd = new Button("Opret konference");
		this.add(btnAdd, 0, 11);
		btnAdd.setOnAction(event -> opretKonference());

		Button btnRemove = new Button("Fjern deltager");
		this.add(btnRemove, 0, 12);
		btnRemove.setOnAction(event -> removeTilmelding());

		Button btnRemoveKonf = new Button("Fjern konference");
		this.add(btnRemoveKonf, 0, 13);
		btnRemoveKonf.setOnAction(event -> removeKonference());

		Button btnUpdate = new Button("Opdater konference");
		this.add(btnUpdate, 0, 14);
		btnUpdate.setOnAction(event -> updateKonferenceInfo(lvwKonferencer
				.getSelectionModel().getSelectedItem()));
	}

	/*
	 * Creates a new konference with the info read from the textfields. WILL
	 * cause errors if any of the textFields it uses are empty. Need an if
	 * statement that checks if they're not empty, else discard information and
	 * message popup that the user caused a thermonuclear war.
	 */
	public void opretKonference() {
		double subtotal = Double.valueOf(txfPris.getText()).doubleValue();
		Service.createKonference(txfKonfId.getText(),
				startDatoPicker.getValue(), slutDatoPicker.getValue(),
				subtotal, txfSted.getText());
		lvwKonferencer.getItems().setAll(Service.getKonferencer());
		clearTextFields();
	}

	/*
	 * Checks if a konference exists, then fills the lvwTilmeldinger with it's
	 * tilmeldinger.
	 */
	public void updateControls() {
		Konference konference = lvwKonferencer.getSelectionModel()
				.getSelectedItem();
		if (konference != null) {
			lvwTilmeldinger.getItems().setAll(konference.getTilmeldinger());
			fillTextFieldsWithKonfInfo(konference);
		}

	}

	/*
	 * Removes tilmelding, clears up any links between that and konference so it
	 * gets deleted by the garbage collector. Also updates the list
	 */
	public void removeTilmelding() {
		Konference konference = lvwKonferencer.getSelectionModel()
				.getSelectedItem();
		Tilmelding tilmelding = lvwTilmeldinger.getSelectionModel()
				.getSelectedItem();
		konference.removeTilmelding(tilmelding);
		lvwTilmeldinger.getItems().setAll(konference.getTilmeldinger());
	}

	/*
	 * Deletes the konference from storage via service, removes all link
	 * attributes between Tilmeldinger, hotels and the konference itself,
	 * atleast that's what is intended. Is possible to crash if more than one
	 * hotel is attributed to the konference.
	 */
	public void removeKonference() {
		Konference konference = lvwKonferencer.getSelectionModel()
				.getSelectedItem();
		for (Tilmelding t : konference.getTilmeldinger()) {
			konference.removeTilmelding(t);
		}
		for (Hotel h : konference.getHoteller()) {
			Service.removeHotelFromKonference(h, konference);
		}
		lvwTilmeldinger.getItems().setAll(konference.getTilmeldinger());
		Service.deleteKonference(konference);
		lvwKonferencer.getItems().setAll(Service.getKonferencer());
		clearTextFields();

	}

	/*
	 * This is clear, the janitor, cleans up after each time we've made a mess
	 * from deleting or creating a konference, clear does good.
	 */
	public void clearTextFields() {
		txfKonfId.clear();
		txfPris.clear();
		txfSted.clear();
		slutDatoPicker.setValue(null);
		startDatoPicker.setValue(null);
	}

	/*
	 * THis is fill, he does the opposite of clear, but only when told to, fills
	 * textfields with info rom a konference.
	 */
	public void fillTextFieldsWithKonfInfo(Konference k) {
		txfKonfId.setText(k.getKonferenceid());
		txfPris.setText(k.getKonferenceafgift() + "");
		txfSted.setText(k.getSted());
		slutDatoPicker.setValue(k.getSlutDato());
		startDatoPicker.setValue(k.getStartDato());

	}

	/*
	 * Reads the textfields and sets them as the new info for the selected
	 * konference
	 */
	public void updateKonferenceInfo(Konference k) {
		if (k != null) {
			k.setKonferenceid(txfKonfId.getText());
			k.setKonferenceafgift(Double.parseDouble(txfPris.getText()));
			k.setSted(txfSted.getText());
			k.setSlutDato(slutDatoPicker.getValue());
			k.setStartDato(startDatoPicker.getValue());
			lvwKonferencer.getItems().setAll(Service.getKonferencer());
		}

	}

	public void aktiverPris() {
		cSamletpris.setDisable(false);
		txfSamletpris.setDisable(false);
	}

}