package org.leumasjaffe.charsheet.view.skills;

import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;

import org.jdesktop.swingx.VerticalLayout;
import org.leumasjaffe.charsheet.model.DDCharacter;
import org.leumasjaffe.charsheet.model.DDCharacterClass;
import org.leumasjaffe.charsheet.model.observable.IntValue;
import org.leumasjaffe.charsheet.model.skill.DDSkills;
import org.leumasjaffe.observer.ObservableListener;
import org.leumasjaffe.observer.ObserverDispatch;

import lombok.AccessLevel;
import lombok.Getter;
import lombok.experimental.FieldDefaults;
import javax.swing.ScrollPaneConstants;

@SuppressWarnings("serial")
@FieldDefaults(level=AccessLevel.PRIVATE, makeFinal=true)
public abstract class SkillLevelUpPanel extends JPanel {
	ObservableListener<JTextField, IntValue> purchaseListener;
	@Getter(AccessLevel.PROTECTED) JPanel panel;
	List<SkillLevelUpLine> lines;

	public SkillLevelUpPanel(final DDCharacter chara, final DDCharacterClass cclass) {
		final IntValue pointsAvaliable = new IntValue(Math.max(1, cclass.getSkillPoints() + 
				chara.getAbilities().getInt().baseModifier()));
		
		GridBagLayout gridBagLayout = new GridBagLayout();
		gridBagLayout.columnWidths = new int[]{0, 0};
		gridBagLayout.rowHeights = new int[]{0, 0, 0};
		gridBagLayout.columnWeights = new double[]{1.0, Double.MIN_VALUE};
		gridBagLayout.rowWeights = new double[]{0.0, 1.0, Double.MIN_VALUE};
		setLayout(gridBagLayout);
		
		panel = new JPanel();
		GridBagConstraints gbc_panel = new GridBagConstraints();
		gbc_panel.insets = new Insets(0, 0, 5, 0);
		gbc_panel.fill = GridBagConstraints.HORIZONTAL;
		gbc_panel.gridx = 0;
		gbc_panel.gridy = 0;
		add(panel, gbc_panel);
		GridBagLayout gbl_panel = new GridBagLayout();
		gbl_panel.columnWidths = new int[]{0, 0, 0, 0};
		gbl_panel.rowHeights = new int[]{0, 0};
		gbl_panel.columnWeights = new double[]{0.0, 1.0, 0.0, Double.MIN_VALUE};
		gbl_panel.rowWeights = new double[]{0.0, Double.MIN_VALUE};
		panel.setLayout(gbl_panel);
		
		JLabel lblPointsRemaining = new JLabel("Points Remaining:");
		GridBagConstraints gbc_lblPointsRemaining = new GridBagConstraints();
		gbc_lblPointsRemaining.insets = new Insets(0, 0, 0, 5);
		gbc_lblPointsRemaining.anchor = GridBagConstraints.EAST;
		gbc_lblPointsRemaining.gridx = 0;
		gbc_lblPointsRemaining.gridy = 0;
		panel.add(lblPointsRemaining, gbc_lblPointsRemaining);
		
		JTextField pointsRemaining = new JTextField();
		pointsRemaining.setEditable(false);
		GridBagConstraints gbc_pointsRemaining = new GridBagConstraints();
		gbc_pointsRemaining.insets = new Insets(0, 0, 0, 5);
		gbc_pointsRemaining.fill = GridBagConstraints.HORIZONTAL;
		gbc_pointsRemaining.gridx = 1;
		gbc_pointsRemaining.gridy = 0;
		panel.add(pointsRemaining, gbc_pointsRemaining);
		pointsRemaining.setColumns(10);
		
		JScrollPane scrollPane = new JScrollPane();
		scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		GridBagConstraints gbc_scrollPane = new GridBagConstraints();
		gbc_scrollPane.fill = GridBagConstraints.BOTH;
		gbc_scrollPane.gridx = 0;
		gbc_scrollPane.gridy = 1;
		add(scrollPane, gbc_scrollPane);
		
		JPanel skillPanel = new JPanel();
		scrollPane.setPreferredSize(new Dimension(480, 300));
		scrollPane.setViewportView(skillPanel);
		skillPanel.setLayout(new VerticalLayout());
				
		lines = new ArrayList<>();
		final DDSkills skills = chara.getSkills();
		skills.getSkills().stream().forEach(skill -> {
			SkillLevelUpLine line = new NormalSkillLevelUpLine(chara, cclass, skill, pointsAvaliable);
			skillPanel.add(line);
			lines.add(line);
		});
		
		purchaseListener = new ObservableListener<>(pointsRemaining, (c, v) -> {
			setIsReady(v.value() == 0);
			c.setText(Integer.toString(v.value()));
		});
		purchaseListener.setObserved(pointsAvaliable);
	}
	
	protected abstract void setIsReady(boolean b);
	
	public void commitAllChanges() {
		lines.forEach(SkillLevelUpLine::applyChange);
	}
	
	@Override
	public void removeNotify() {
		super.removeNotify();
		ObserverDispatch.unsubscribeAll(purchaseListener);
	}
}