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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2013 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jboss.jandex;

import static org.jboss.jandex.ClassInfo.EnclosingMethodInfo;

import java.io.BufferedInputStream;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Modifier;
import java.nio.charset.Charset;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;

/**
 * Analyzes and indexes the annotation and key structural information of a set
 * of classes. The indexer will purposefully skip any class that is not Java 5
 * or later. It will also do a basic/quick structural scan on any class it
 * determines does not have annotations.
 *
 * 
 * The Indexer operates on input streams that point to class file data. Input
 * streams do not need to be buffered, as the indexer already does this. There
 * is also no limit to the number of class file streams the indexer can process,
 * other than available memory.
 *
 * 

 * The Indexer attempts to minimize the final memory state of the index, but to
 * do this it must maintain additional in-process state (intern tables etc)
 * until the index is complete.
 *
 * 

 * Numerous optimizations are taken during indexing to attempt to minimize the
 * CPU and I/O cost, however, the Java class file format was not designed for
 * partial searching, which ultimately limits the efficiency of processing them.
 *
 * 

 * Thread-Safety This class is not thread-safe can not be
 * shared between threads. The index it produces however is thread-safe.
 *
 * @author Jason T. Greene
 *
 */
public final class Indexer {

    private final static int CONSTANT_CLASS = 7;
    private final static int CONSTANT_FIELDREF = 9;
    private final static int CONSTANT_METHODREF = 10;
    private final static int CONSTANT_INTERFACEMETHODREF = 11;
    private final static int CONSTANT_STRING = 8;
    private final static int CONSTANT_INTEGER = 3;
    private final static int CONSTANT_FLOAT = 4;
    private final static int CONSTANT_LONG = 5;
    private final static int CONSTANT_DOUBLE = 6;
    private final static int CONSTANT_NAMEANDTYPE = 12;
    private final static int CONSTANT_UTF8 = 1;
    private final static int CONSTANT_INVOKEDYNAMIC = 18;
    private final static int CONSTANT_METHODHANDLE = 15;
    private final static int CONSTANT_METHODTYPE = 16;

    // "RuntimeVisibleAnnotations"
    private final static byte[] RUNTIME_ANNOTATIONS = new byte[] {
        0x52, 0x75, 0x6e, 0x74, 0x69, 0x6d, 0x65, 0x56, 0x69, 0x73, 0x69, 0x62,
        0x6c, 0x65, 0x41, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e,
        0x73
    };

    // "RuntimeVisibleParameterAnnotations"
    private final static byte[] RUNTIME_PARAM_ANNOTATIONS = new byte[] {
        0x52, 0x75, 0x6e, 0x74, 0x69, 0x6d, 0x65, 0x56, 0x69, 0x73, 0x69, 0x62,
        0x6c, 0x65, 0x50, 0x61, 0x72, 0x61, 0x6d, 0x65, 0x74, 0x65, 0x72, 0x41,
        0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73
    };


    // "RuntimeTypeVisibleAnnotations"
    private final static byte[] RUNTIME_TYPE_ANNOTATIONS = new byte[] {
        0x52, 0x75, 0x6e, 0x74, 0x69, 0x6d, 0x65, 0x56, 0x69, 0x73, 0x69, 0x62,
        0x6c, 0x65, 0x54, 0x79, 0x70, 0x65, 0x41, 0x6e, 0x6e, 0x6f, 0x74, 0x61,
        0x74, 0x69, 0x6f, 0x6e, 0x73
    };

    // "Signature"
    private final static byte[] SIGNATURE = new byte[] {
        0x53, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75, 0x72, 0x65
    };

    // "Exceptions"
    private final static byte[] EXCEPTIONS = new byte[] {
        0x45, 0x78, 0x63, 0x65, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73
    };

    // "InnerClasses"
    private final static byte[] INNER_CLASSES = new byte[] {
        0x49, 0x6e, 0x6e, 0x65, 0x72, 0x43, 0x6c, 0x61, 0x73, 0x73, 0x65, 0x73
    };

    // "EnclosingMethod"
    private final static byte[] ENCLOSING_METHOD = new byte[] {
        0x45, 0x6e, 0x63, 0x6c, 0x6f, 0x73, 0x69, 0x6e, 0x67, 0x4d, 0x65, 0x74, 0x68, 0x6f, 0x64
    };

    private final static int RUNTIME_ANNOTATIONS_LEN = RUNTIME_ANNOTATIONS.length;
    private final static int RUNTIME_PARAM_ANNOTATIONS_LEN = RUNTIME_PARAM_ANNOTATIONS.length;
    private final static int RUNTIME_TYPE_ANNOTATIONS_LEN = RUNTIME_TYPE_ANNOTATIONS.length;
    private final static int SIGNATURE_LEN = SIGNATURE.length;
    private final static int EXCEPTIONS_LEN = EXCEPTIONS.length;
    private final static int INNER_CLASSES_LEN = INNER_CLASSES.length;
    private final static int ENCLOSING_METHOD_LEN = ENCLOSING_METHOD.length;

    private final static int HAS_RUNTIME_ANNOTATION = 1;
    private final static int HAS_RUNTIME_PARAM_ANNOTATION = 2;
    private final static int HAS_RUNTIME_TYPE_ANNOTATION = 3;
    private final static int HAS_SIGNATURE = 4;
    private final static int HAS_EXCEPTIONS = 5;
    private final static int HAS_INNER_CLASSES = 6;
    private final static int HAS_ENCLOSING_METHOD = 7;

    private final static byte[] INIT_METHOD_NAME = Utils.toUTF8("");

    private IdentityHashMap signaturePresent;

    private static class InnerClassInfo {
        private InnerClassInfo(DotName innerClass, DotName enclosingClass, String simpleName, int flags) {
            this.innnerClass = innerClass;
            this.enclosingClass = enclosingClass;
            this.simpleName = simpleName;
            this.flags = flags;
        }

        private final DotName innnerClass;
        private DotName enclosingClass;
        private String simpleName;
        private int flags;

    }

    private static boolean match(byte[] target, int offset, byte[] expected) {
        if (target.length - offset < expected.length)
            return false;

        for (int i = 0; i < expected.length; i++)
            if (target[offset + i] != expected[i])
                return false;

        return true;
    }

    private static byte[] sizeToFit(byte[] buf, int needed, int offset, int remainingEntries) {
        if (offset + needed > buf.length) {
            buf = Arrays.copyOf(buf, buf.length + Math.max(needed, (remainingEntries + 1) * 20));
        }
        return buf;
    }

    private static void skipFully(InputStream s, long n) throws IOException {
        long skipped;
        long total = 0;

        while (total < n) {
            skipped = s.skip(n - total);
            if (skipped < 0)
                throw new EOFException();
            total += skipped;

            // Skip is not guaranteed to distinguish between EOF and nothing-read
            if (skipped == 0) {
                if (s.read() < 0) {
                    throw new EOFException();
                }
                total++;
            }
        }
    }


    // Class lifespan fields
    private byte[] constantPool;
    private int[] constantPoolOffsets;
    private byte[] constantPoolAnnoAttrributes;
    private ClassInfo currentClass;
    private HashMap> classAnnotations;
    private ArrayList elementAnnotations;
    private List