/*

 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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package jdk.jfr.internal.tool;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.PrintWriter;

import java.nio.file.Path;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.function.Predicate;

import jdk.jfr.EventType;

import jdk.jfr.Timespan;

import jdk.jfr.Timestamp;

import jdk.jfr.ValueDescriptor;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.consumer.RecordedObject;

import jdk.jfr.consumer.RecordingFile;

abstract class EventPrintWriter extends StructuredWriter {

    enum ValueType {

        TIMESPAN, TIMESTAMP, OTHER

    }

    protected static final String STACK_TRACE_FIELD = "stackTrace";

    protected static final String EVENT_THREAD_FIELD = "eventThread";

    private Predicate<EventType> eventFilter = x -> true;

    private int stackDepth;

    // cach that will speed up annotation lookup

    private Map<ValueDescriptor, ValueType> typeOfValues = new HashMap<>();

    EventPrintWriter(PrintWriter p) {

        super(p);

    }

    abstract protected void print(List<RecordedEvent> events);

    void print(Path source) throws FileNotFoundException, IOException {

        List<RecordedEvent> events = new ArrayList<>(500_000);

        printBegin();

        try (RecordingFile file = new RecordingFile(source)) {

            while (file.hasMoreEvents()) {

                RecordedEvent event = file.readEvent();

                if (acceptEvent(event)) {

                    events.add(event);

                }

                    print(events);

                    events.clear();

                }

            }

        }

        printEnd();

        flush(true);

    }

    protected void printEnd() {

    }

    protected void printBegin() {

    }

    public final void setEventFilter(Predicate<EventType> eventFilter) {

        this.eventFilter = eventFilter;

    }

    protected final boolean acceptEvent(RecordedEvent event) {

        return eventFilter.test(event.getEventType());

    }

    protected final int getStackDepth() {

        return stackDepth;

    }

    protected final boolean isLateField(String name) {

        return name.equals(EVENT_THREAD_FIELD) || name.equals(STACK_TRACE_FIELD);

    }

    public void setStackDepth(int stackDepth) {

        this.stackDepth = stackDepth;

    }

    protected Object getValue(RecordedObject object, ValueDescriptor v) {

        ValueType valueType = typeOfValues.get(v);

        if (valueType == null) {

            valueType = determineValueType(v);

            typeOfValues.put(v, valueType);

        }

        switch (valueType) {

        case TIMESPAN:

            return object.getDuration(v.getName());

        case TIMESTAMP:

        default:

            return object.getValue(v.getName());

        }

    }

    // It's expensive t check

    private ValueType determineValueType(ValueDescriptor v) {

        if (v.getAnnotation(Timespan.class) != null) {

            return ValueType.TIMESPAN;

        }

        if (v.getAnnotation(Timestamp.class) != null) {

            return ValueType.TIMESTAMP;

        }

        return ValueType.OTHER;

    }

}