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package cdc.perfs.ui.swing;

import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import cdc.perfs.core.io.PerfsIo;
import cdc.perfs.core.snapshot.SnapshotEnvironment;
import cdc.perfs.ui.Rendering;
import cdc.util.cli.AbstractMainSupport;
import cdc.util.cli.FeatureMask;
import cdc.util.cli.MainResult;
import cdc.util.cli.OptionEnum;
import cdc.util.files.Resources;

/**
 * Performances viewer.
 * 
 * This is a standalone tool that can be used to display previously recorded performances.
 *
 * @author Damien Carbonne
 *
 */
public final class PerfsViewer {
    private static final Logger LOGGER = LogManager.getLogger(PerfsViewer.class);
    private final MainArgs margs;

    public static class MainArgs {
        public final List inputs = new ArrayList<>();
        protected final FeatureMask features = new FeatureMask<>();

        public void setEnabled(Feature feature,
                               boolean enabled) {
            features.setEnabled(feature, enabled);
        }

        public boolean isEnabled(Feature feature) {
            return features.isEnabled(feature);
        }

        /**
         * Enumeration of possible boolean options.
         */
        public enum Feature implements OptionEnum {
            FASTEST("fastest", "If set, use fastest drawing algorithm (default)."),
            BEST("best", "If set, use best drawing algorithm."),
            SHOW_STATS("show-stats", "If set, show statictics."),
            NO_SHOW_STATS("no-show-stats", "If set, do not show statictics (default)."),
            DRAW_BORDERS("draw-borders", "If set, draw borders of measures (default)."),
            NO_DRAW_BORDERS("no-draw-borders", "If set, hide borders of measures.");

            private final String name;
            private final String description;

            private Feature(String name,
                            String description) {
                this.name = name;
                this.description = description;
            }

            @Override
            public final String getName() {
                return name;
            }

            @Override
            public final String getDescription() {
                return description;
            }
        }
    }

    private PerfsViewer(MainArgs margs) {
        this.margs = margs;
    }

    private void execute() {
        SwingUtilities.invokeLater(() -> {
            final MainFrame frame = new MainFrame(false);
            // Analyze features
            final Rendering rendering = margs.isEnabled(MainArgs.Feature.BEST) ? Rendering.BEST : Rendering.FASTEST;
            frame.setRendering(rendering);
            final boolean showStats = margs.isEnabled(MainArgs.Feature.SHOW_STATS);
            frame.setShowStats(showStats);
            final boolean drawBorders = !margs.isEnabled(MainArgs.Feature.NO_DRAW_BORDERS);
            frame.setDrawBorders(drawBorders);

            frame.setVisible(true);
            for (final URL url : margs.inputs) {
                try {
                    final SnapshotEnvironment environment = PerfsIo.load(url);
                    frame.addSnaphot(environment, url.getPath());
                } catch (final IOException e) {
                    LOGGER.error("Failed to load " + url, e);
                    JOptionPane.showMessageDialog(frame,
                                                  "Failed to open '" + url + "'\n" + e.getMessage(),
                                                  "Error",
                                                  JOptionPane.ERROR_MESSAGE);
                }
            }
        });
    }

    public static void execute(MainArgs margs) {
        final PerfsViewer instance = new PerfsViewer(margs);
        instance.execute();
    }

    public static MainResult exec(String... args) {
        final MainSupport support = new MainSupport();
        support.main(args);
        return support.getResult();
    }

    public static void main(String... args) {
        // Do not exit
        exec(args);
    }

    private static class MainSupport extends AbstractMainSupport {
        public MainSupport() {
            super(PerfsViewer.class, LOGGER);
        }

        @Override
        protected String getVersion() {
            return cdc.perfs.api.Config.VERSION;
        }

        @Override
        protected void addSpecificOptions(Options options) {
            options.addOption(Option.builder()
                                    .longOpt(INPUT)
                                    .desc("Optional name(s) of the XML/binary input(s)  to open.")
                                    .hasArgs()
                                    .build());

            addNoArgOptions(options, MainArgs.Feature.class);

            createGroup(options, MainArgs.Feature.FASTEST, MainArgs.Feature.BEST);
            createGroup(options, MainArgs.Feature.SHOW_STATS, MainArgs.Feature.NO_SHOW_STATS);
            createGroup(options, MainArgs.Feature.DRAW_BORDERS, MainArgs.Feature.NO_DRAW_BORDERS);
        }

        @Override
        protected MainArgs analyze(CommandLine cl) throws ParseException {
            final MainArgs margs = new MainArgs();

            if (cl.hasOption(INPUT)) {
                for (final String input : cl.getOptionValues(INPUT)) {
                    final URL url = Resources.getResource(input);
                    if (url == null) {
                        throw new ParseException("Invalid url: " + input);
                    }
                    margs.inputs.add(url);
                }
                setMask(cl, MainArgs.Feature.class, margs.features::setEnabled);
            }

            return margs;
        }

        @Override
        protected Void execute(MainArgs margs) throws Exception {
            PerfsViewer.execute(margs);
            return null;
        }
    }
}