/*
 * Copyright 2012-2017 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.vm.compiler.client.core.internal;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import com.redhat.thermostat.client.core.controllers.InformationServiceController;
import com.redhat.thermostat.client.core.experimental.Duration;
import com.redhat.thermostat.client.core.experimental.TimeRangeController;
import com.redhat.thermostat.client.core.views.BasicView.Action;
import com.redhat.thermostat.client.core.views.UIComponent;
import com.redhat.thermostat.common.ActionEvent;
import com.redhat.thermostat.common.ActionListener;
import com.redhat.thermostat.common.ApplicationService;
import com.redhat.thermostat.common.NotImplementedException;
import com.redhat.thermostat.common.Timer;
import com.redhat.thermostat.common.Timer.SchedulingType;
import com.redhat.thermostat.common.model.Range;
import com.redhat.thermostat.shared.locale.LocalizedString;
import com.redhat.thermostat.shared.locale.Translate;
import com.redhat.thermostat.storage.core.VmRef;
import com.redhat.thermostat.storage.model.DiscreteTimeData;
import com.redhat.thermostat.vm.compiler.client.core.VmCompilerStatView;
import com.redhat.thermostat.vm.compiler.client.core.VmCompilerStatView.ViewData;
import com.redhat.thermostat.vm.compiler.client.core.VmCompilerStatViewProvider;
import com.redhat.thermostat.vm.compiler.client.locale.LocaleResources;
import com.redhat.thermostat.vm.compiler.common.ParsedVmCompilerStat;
import com.redhat.thermostat.vm.compiler.common.ParsedVmCompilerStat.CompileType;
import com.redhat.thermostat.vm.compiler.common.VmCompilerStat;
import com.redhat.thermostat.vm.compiler.common.VmCompilerStatDao;

public class VmCompilerStatController implements InformationServiceController<VmRef> {

    private static final Translate<LocaleResources> translator = LocaleResources.createLocalizer();

    private static final Map<CompileType, String> COMPILATION_TYPES = new HashMap<>();
    private static final Map<CompileType, String> FAILED_COMPILATION_TYPES = new HashMap<>();

    static {
        COMPILATION_TYPES.put(CompileType.NO_COMPILE,
                translator.localize(LocaleResources.COMPILE_TYPE_NO_COMPILE).getContents());
        COMPILATION_TYPES.put(CompileType.NORMAL_COMPILE,
                translator.localize(LocaleResources.COMPILE_TYPE_NORMAL_COMPILE).getContents());
        COMPILATION_TYPES.put(CompileType.OSR_COMPILE,
                translator.localize(LocaleResources.COMPILE_TYPE_OSR_COMPILE).getContents());
        COMPILATION_TYPES.put(CompileType.NATIVE_COMPILE,
                translator.localize(LocaleResources.COMPILE_TYPE_NATIVE_COMPILE).getContents());

        FAILED_COMPILATION_TYPES.put(CompileType.NO_COMPILE,
                translator.localize(LocaleResources.COMPILE_TYPE_NO_FAILED_COMPILE).getContents());
        FAILED_COMPILATION_TYPES.put(CompileType.NORMAL_COMPILE,
                translator.localize(LocaleResources.COMPILE_TYPE_NORMAL_COMPILE).getContents());
        FAILED_COMPILATION_TYPES.put(CompileType.OSR_COMPILE,
                translator.localize(LocaleResources.COMPILE_TYPE_OSR_COMPILE).getContents());
        FAILED_COMPILATION_TYPES.put(CompileType.NATIVE_COMPILE,
                translator.localize(LocaleResources.COMPILE_TYPE_NATIVE_COMPILE).getContents());
    }

    private final VmCompilerStatView compilerView;
    private final VmRef ref;
    private final VmCompilerStatDao dao;
    private final Timer timer;

    private TimeRangeController<VmCompilerStat, VmRef> timeRangeController;

    public VmCompilerStatController(ApplicationService appSvc, VmCompilerStatDao vmCompilerStatDao, VmRef ref, VmCompilerStatViewProvider viewProvider) {
        this.ref = ref;
        dao = vmCompilerStatDao;
        timer = appSvc.getTimerFactory().createTimer();

        timer.setAction(new UpdateChartData());
        timer.setSchedulingType(SchedulingType.FIXED_RATE);
        timer.setTimeUnit(TimeUnit.SECONDS);
        timer.setDelay(5);
        timer.setInitialDelay(0);

        compilerView = viewProvider.createView();

        compilerView.addActionListener(new ActionListener<VmCompilerStatView.Action>() {
            @Override
            public void actionPerformed(ActionEvent<Action> actionEvent) {
                switch(actionEvent.getActionId()) {
                    case HIDDEN:
                        stop();
                        break;
                    case VISIBLE:
                        start();
                        break;
                    default:
                        throw new NotImplementedException("unknown action: " + actionEvent.getActionId());
                }
            }
        });


        timeRangeController = new TimeRangeController<>();
    }

    private void start() {
        timer.start();
    }

    private void stop() {
        timer.stop();
    }

    @Override
    public LocalizedString getLocalizedName() {
        return translator.localize(LocaleResources.VM_INFO_TAB_COMPILER);
    }

    @Override
    public UIComponent getView() {
        return (UIComponent) compilerView;
    }

    private class UpdateChartData implements Runnable {
        @Override
        public void run() {
            VmCompilerStat oldest = dao.getOldest(ref);
            VmCompilerStat newest = dao.getNewest(ref);
            // Do nothing when there is no data
            if (oldest == null || newest == null) {
                return;
            }

            ParsedVmCompilerStat stat = new ParsedVmCompilerStat(newest);

            ViewData data = new ViewData();
            data.totalCompiles = String.valueOf(stat.getTotalCompiles());
            data.totalBailouts = String.valueOf(stat.getTotalBailouts());
            data.totalInvalidates = String.valueOf(stat.getTotalInvalidates());
            data.compilationTime = String.format("%d %s", stat.getCompilationTime(), "ms");
            data.lastSize = stat.getLastSize().toString();
            data.lastType = translateCompileDescription(stat.getLastType());
            data.lastMethod = stat.getLastMethod();
            data.lastFailedType = translateDecompileDescription(stat.getLastFailedType());
            data.lastFailedMethod = stat.getLastFailedMethod();

            compilerView.setCurrentDisplay(data);

            final List<DiscreteTimeData<? extends Number>> totalCompiles = new ArrayList<>();
            final List<DiscreteTimeData<? extends Number>> totalInvalidates = new ArrayList<>();
            final List<DiscreteTimeData<? extends Number>> totalBailouts = new ArrayList<>();
            final List<DiscreteTimeData<? extends Number>> compileTime = new ArrayList<>();

            Range<Long> newAvailableRange = new Range<>(oldest.getTimeStamp(), newest.getTimeStamp());

            TimeRangeController.StatsSupplier<VmCompilerStat, VmRef> singleValueSupplier = new TimeRangeController.StatsSupplier<VmCompilerStat, VmRef>() {
                @Override
                public List<VmCompilerStat> getStats(final VmRef ref, final long since, final long to) {
                    return dao.getCompilerStats(ref, since, to);
                }
            };

            TimeRangeController.SingleArgRunnable<VmCompilerStat> runnable = new TimeRangeController.SingleArgRunnable<VmCompilerStat>() {
                @Override
                public void run(VmCompilerStat stat) {
                    long timeStamp = stat.getTimeStamp();

                    totalCompiles.add(new DiscreteTimeData<Number>(timeStamp, stat.getTotalCompiles()));
                    totalInvalidates.add(new DiscreteTimeData<Number>(timeStamp, stat.getTotalInvalidates()));
                    totalBailouts.add(new DiscreteTimeData<Number>(timeStamp, stat.getTotalBailouts()));

                    compileTime.add(new DiscreteTimeData<Number>(timeStamp, stat.getCompilationTime()));
                }

            };

            Duration userDesiredDuration = compilerView.getUserDesiredDuration();
            if (userDesiredDuration != null) {
                timeRangeController.update(userDesiredDuration, newAvailableRange, singleValueSupplier, ref, runnable);
                compilerView.setAvailableDataRange(timeRangeController.getAvailableRange());

                compilerView.addCompilerData(VmCompilerStatView.Type.TOTAL_COMPILES, totalCompiles);
                compilerView.addCompilerData(VmCompilerStatView.Type.TOTAL_BAILOUTS, totalBailouts);
                compilerView.addCompilerData(VmCompilerStatView.Type.TOTAL_INVALIDATES, totalInvalidates);

                compilerView.addCompilerData(VmCompilerStatView.Type.TOTAL_TIME, compileTime);
            }
        }

        private String translateCompileDescription(CompileType type) {
            return COMPILATION_TYPES.get(type);
        }

        private String translateDecompileDescription(CompileType type) {
            return FAILED_COMPILATION_TYPES.get(type);
        }
    }

}