package org.leumasjaffe.recipe.view;

import javax.swing.JPanel;
import javax.swing.event.DocumentListener;

import org.leumasjaffe.observer.ForwardingObservableListener;
import org.leumasjaffe.observer.ObserverDispatch;
import org.leumasjaffe.recipe.model.Ingredient;
import org.leumasjaffe.recipe.model.Step;

import lombok.AccessLevel;
import lombok.Getter;
import lombok.experimental.FieldDefaults;

import java.awt.GridBagLayout;

import java.awt.GridBagConstraints;
import java.awt.Insets;
import java.util.List;

import javax.swing.JLabel;
import javax.swing.JTextPane;
import java.awt.Component;
import javax.swing.Box;
import java.awt.Dimension;

@SuppressWarnings("serial")
@FieldDefaults(level=AccessLevel.PRIVATE, makeFinal=true)
public class StepPanel extends JPanel implements AutoGrowPanel.DocumentListenable {
	@Getter(AccessLevel.PACKAGE) JLabel lblIndex;
	@Getter(AccessLevel.PACKAGE) JLabel lblDuration;
	@Getter(AccessLevel.PACKAGE) JTextPane txtpnInstructions;
	@Getter(AccessLevel.PACKAGE) JPanel panelIngredients;
	ForwardingObservableListener<Step> listener = new ForwardingObservableListener<>();
		
	public StepPanel(int zeroIndex, Step step) {
		GridBagLayout gridBagLayout = new GridBagLayout();
		gridBagLayout.columnWidths = new int[]{0, 0, 0};
		gridBagLayout.rowHeights = new int[]{0, 0};
		gridBagLayout.columnWeights = new double[]{0.0, 1.0, Double.MIN_VALUE};
		gridBagLayout.rowWeights = new double[]{1.0, Double.MIN_VALUE};
		setLayout(gridBagLayout);
		
		JPanel panelLeft = new JPanel();
		GridBagConstraints gbc_panelLeft = new GridBagConstraints();
		gbc_panelLeft.insets = new Insets(0, 0, 0, 5);
		gbc_panelLeft.fill = GridBagConstraints.BOTH;
		gbc_panelLeft.gridx = 0;
		gbc_panelLeft.gridy = 0;
		add(panelLeft, gbc_panelLeft);
		GridBagLayout gbl_panelLeft = new GridBagLayout();
		gbl_panelLeft.columnWidths = new int[]{0, 0, 0, 0};
		gbl_panelLeft.rowHeights = new int[]{0, 0, 0};
		gbl_panelLeft.columnWeights = new double[]{0.0, 1.0, 0.0, Double.MIN_VALUE};
		gbl_panelLeft.rowWeights = new double[]{0.0, 1.0, Double.MIN_VALUE};
		panelLeft.setLayout(gbl_panelLeft);
		
		lblIndex = new JLabel("");
		GridBagConstraints gbc_lblIndex = new GridBagConstraints();
		gbc_lblIndex.fill = GridBagConstraints.HORIZONTAL;
		gbc_lblIndex.insets = new Insets(0, 0, 5, 5);
		gbc_lblIndex.gridx = 0;
		gbc_lblIndex.gridy = 0;
		panelLeft.add(lblIndex, gbc_lblIndex);
		
		Component horizontalGlue = Box.createHorizontalGlue();
		GridBagConstraints gbc_horizontalGlue = new GridBagConstraints();
		gbc_horizontalGlue.insets = new Insets(0, 0, 5, 5);
		gbc_horizontalGlue.gridx = 1;
		gbc_horizontalGlue.gridy = 0;
		panelLeft.add(horizontalGlue, gbc_horizontalGlue);
		
		lblDuration = new JLabel("Requires: " + step.getDuration().toString());
		GridBagConstraints gbc_lblDuration = new GridBagConstraints();
		gbc_lblDuration.insets = new Insets(0, 0, 5, 0);
		gbc_lblDuration.gridx = 2;
		gbc_lblDuration.gridy = 0;
		panelLeft.add(lblDuration, gbc_lblDuration);
		
		final List<Ingredient> ingredients = step.getIngredients();
		panelIngredients = new AutoGrowPanel(IngredientPanel::new,
				Ingredient::new, ingredients::add, i -> {
					ingredients.remove((int) i);
					ObserverDispatch.notifySubscribers(step);
				}, ingredients.toArray(new Ingredient[0]));
		GridBagConstraints gbc_panelIngredients = new GridBagConstraints();
		gbc_panelIngredients.gridwidth = 3;
		gbc_panelIngredients.insets = new Insets(0, 0, 0, 5);
		gbc_panelIngredients.fill = GridBagConstraints.BOTH;
		gbc_panelIngredients.gridx = 0;
		gbc_panelIngredients.gridy = 1;
		panelLeft.add(panelIngredients, gbc_panelIngredients);
		
		txtpnInstructions = new JTextPane();
		txtpnInstructions.setPreferredSize(new Dimension(200, 30));
		txtpnInstructions.setText(step.getInstruction());
		GridBagConstraints gbc_txtpnInstructions = new GridBagConstraints();
		gbc_txtpnInstructions.fill = GridBagConstraints.BOTH;
		gbc_txtpnInstructions.gridx = 1;
		gbc_txtpnInstructions.gridy = 0;
		add(txtpnInstructions, gbc_txtpnInstructions);
		
		setListPosition(zeroIndex);
		listener.setObserved(step, step.getIngredients());
	}

	@Override
	public void addDocumentListener(DocumentListener dl) {
		this.txtpnInstructions.getDocument().addDocumentListener(dl);
	}

	@Override
	public void removeDocumentListener(DocumentListener dl) {
		this.txtpnInstructions.getDocument().removeDocumentListener(dl);		
	}
	
	@Override
	public void setListPosition(int zeroIndex) {
		this.lblIndex.setText("Step " + Integer.toString(zeroIndex + 1));
		repaint();
	}
	
	@Override
	public void removeNotify() {
		super.removeNotify();
		ObserverDispatch.unsubscribeAll(listener);
	}
}