/*
 * Copyright 2014-2015 Cel Skeggs.
 *
 * This file is part of the CCRE, the Common Chicken Runtime Engine.
 *
 * The CCRE is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any
 * later version.
 *
 * The CCRE is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the CCRE.  If not, see <http://www.gnu.org/licenses/>.
 */
package ccre.supercanvas.components.channels;

import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.Graphics2D;

import ccre.channel.CancelOutput;
import ccre.channel.EventInput;
import ccre.channel.EventOutput;
import ccre.rconf.RConf.Entry;
import ccre.supercanvas.BaseChannelComponent;
import ccre.supercanvas.Rendering;
import ccre.supercanvas.SuperCanvasPanel;

/**
 * A component allowing display of events.
 *
 * @author skeggsc
 */
public class EventDisplayComponent extends BaseChannelComponent<EventDisplayComponent.View> implements EventOutput {

    static enum View {
        FLASHING_LIGHT, TIME_COUNTER, TEXTUAL
    }

    private static final long serialVersionUID = 7298197110274322991L;
    private transient long countStart;
    private boolean subscribed;
    private final EventInput inp;
    private transient CancelOutput unsubscribe;

    /**
     * Create a new EventDisplayComponent with a EventInput to read from.
     *
     * @param cx the X coordinate.
     * @param cy the Y coordinate.
     * @param name the name of the input.
     * @param inp the EventInput to read from.
     */
    public EventDisplayComponent(int cx, int cy, String name, EventInput inp) {
        super(cx, cy, name);
        this.inp = inp;
    }

    /**
     * Create a new EventDisplayComponent.
     *
     * @param cx the X coordinate.
     * @param cy the Y coordinate.
     * @param name the name of the input.
     */
    public EventDisplayComponent(int cx, int cy, String name) {
        this(cx, cy, name, null);
    }

    @Override
    public void channelRender(Graphics2D g, int screenWidth, int screenHeight, FontMetrics fontMetrics, int mouseX, int mouseY) {
        long count = (System.currentTimeMillis() - countStart);
        switch (activeView) {
        case FLASHING_LIGHT:
            int rad = Math.min(halfWidth / 3, halfHeight / 3);
            int trad = Math.round(rad * (1 - Math.min(1, Math.max(count / 500.0f, 0))));
            g.setColor(Color.BLACK);
            g.fillOval(centerX - rad, centerY - rad, rad * 2, rad * 2);
            g.setColor(Rendering.blend(Color.GREEN, Color.BLACK, count / 500.0f));
            g.fillOval(centerX - trad, centerY - trad, trad * 2, trad * 2);
            g.setColor(Color.BLACK);
            g.drawOval(centerX - rad, centerY - rad, rad * 2, rad * 2);
            break;
        case TIME_COUNTER:
            g.setFont(Rendering.labels);
            g.setColor(Color.BLACK);
            String text = countStart == 0 ? "NEVER" : String.format("%2.1fs", count / 1000.0);
            g.drawString(text, centerX - g.getFontMetrics().stringWidth(text) / 2, centerY + g.getFontMetrics().getAscent() / 2);
            break;
        case TEXTUAL:
            g.setFont(Rendering.labels);
            g.setColor(Color.BLACK);
            text = count < 500 ? "YES" : "NO";
            g.drawString(text, centerX - g.getFontMetrics().stringWidth(text) / 2, centerY + g.getFontMetrics().getAscent() / 2);
            break;
        }
    }

    @Override
    public boolean onInteract(int x, int y) {
        return false;
    }

    @Override
    protected void onChangePanel(SuperCanvasPanel panel) {
        boolean hasPanel = panel != null;
        if (inp != null && hasPanel != subscribed) {
            if (unsubscribe != null) {
                unsubscribe.cancel();
                unsubscribe = null;
            }
            if (hasPanel) {
                unsubscribe = inp.send(this);
            }
            subscribed = hasPanel;
        }
    }

    @Override
    public void event() {
        countStart = System.currentTimeMillis();
    }

    @Override
    protected void setDefaultView() {
        activeView = View.FLASHING_LIGHT;
    }

    @Override
    public Entry[] queryRConf() throws InterruptedException {
        return rconfBase();
    }

    @Override
    public boolean signalRConf(int field, byte[] data) throws InterruptedException {
        return rconfBase(field, data) == BASE_VALID;
    }
}