/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.jackrabbit.oak.plugins.document;

import static java.util.Collections.emptyList;
import static org.apache.jackrabbit.oak.plugins.memory.PropertyStates.createProperty;

import java.util.List;

import javax.annotation.Nonnull;
import javax.jcr.PropertyType;

import com.google.common.collect.Lists;
import org.apache.jackrabbit.oak.api.PropertyState;
import org.apache.jackrabbit.oak.api.Type;
import org.apache.jackrabbit.oak.cache.StringCache;
import org.apache.jackrabbit.oak.commons.json.JsopReader;
import org.apache.jackrabbit.oak.commons.json.JsopTokenizer;
import org.apache.jackrabbit.oak.json.TypeCodes;
import org.apache.jackrabbit.oak.plugins.memory.AbstractPropertyState;
import org.apache.jackrabbit.oak.plugins.memory.BinaryPropertyState;
import org.apache.jackrabbit.oak.plugins.memory.BooleanPropertyState;
import org.apache.jackrabbit.oak.plugins.memory.DoublePropertyState;
import org.apache.jackrabbit.oak.plugins.memory.LongPropertyState;
import org.apache.jackrabbit.oak.plugins.memory.PropertyStates;
import org.apache.jackrabbit.oak.plugins.memory.StringPropertyState;
import org.apache.jackrabbit.oak.plugins.value.Conversions;

/**
 * PropertyState implementation with lazy parsing of the JSOP encoded value.
 */
final class DocumentPropertyState implements PropertyState {

    private final DocumentNodeStore store;

    private final String name;

    private final String value;

    private PropertyState parsed;

    DocumentPropertyState(DocumentNodeStore store, String name, String value) {
        this.store = store;
        this.name = name;
        this.value = value;
    }

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

    @Override
    public boolean isArray() {
        return parsed().isArray();
    }

    @Override
    public Type<?> getType() {
        return parsed().getType();
    }

    @Nonnull
    @Override
    public <T> T getValue(Type<T> type) {
        return parsed().getValue(type);
    }

    @Nonnull
    @Override
    public <T> T getValue(Type<T> type, int index) {
        return parsed().getValue(type, index);
    }

    @Override
    public long size() {
        return parsed().size();
    }

    @Override
    public long size(int index) {
        long size;
        PropertyState parsed = parsed();
        if (parsed.getType() == Type.BINARIES) {
            size = parsed.getValue(Type.BINARY, index).length();
        } else {
            size = parsed.size(index);
        }
        return size;
    }

    @Override
    public int count() {
        return parsed().count();
    }

    /**
     * Returns the raw un-parsed value as passed to the constructor of this
     * property state.
     *
     * @return the raw un-parsed value.
     */
    @Nonnull
    String getValue() {
        return value;
    }

    //------------------------------------------------------------< Object >--

    @Override
    public boolean equals(Object object) {
        if (this == object) {
            return true;
        } else if (object instanceof DocumentPropertyState) {
            DocumentPropertyState other = (DocumentPropertyState) object;
            return this.name.equals(other.name)
                    && this.value.equals(other.value);
        }
        // fall back to default equality check in AbstractPropertyState
        return object instanceof PropertyState
                && AbstractPropertyState.equal(parsed(), (PropertyState) object);
    }

    @Override
    public int hashCode() {
        return AbstractPropertyState.hashCode(this);
    }

    @Override
    public String toString() {
        return AbstractPropertyState.toString(this);
    }

    //----------------------------< internal >----------------------------------

    private PropertyState parsed() {
        if (parsed == null) {
            JsopReader reader = new JsopTokenizer(value);
            if (reader.matches('[')) {
                parsed = readArrayProperty(name, reader);
            } else {
                parsed = readProperty(name, reader);
            }
        }
        return parsed;
    }

    /**
     * Read a {@code PropertyState} from a {@link JsopReader}
     * @param name  The name of the property state
     * @param reader  The reader
     * @return new property state
     */
    PropertyState readProperty(String name, JsopReader reader) {
        return readProperty(name, store, reader);
    }

    /**
     * Read a {@code PropertyState} from a {@link JsopReader}.
     *
     * @param name the name of the property state
     * @param store the store
     * @param reader the reader
     * @return new property state
     */
    static PropertyState readProperty(String name, DocumentNodeStore store, JsopReader reader) {
        if (reader.matches(JsopReader.NUMBER)) {
            String number = reader.getToken();
            try {
                return new LongPropertyState(name, Long.parseLong(number));
            } catch (NumberFormatException e) {
                return new DoublePropertyState(name, Double.parseDouble(number));
            }
        } else if (reader.matches(JsopReader.TRUE)) {
            return BooleanPropertyState.booleanProperty(name, true);
        } else if (reader.matches(JsopReader.FALSE)) {
            return BooleanPropertyState.booleanProperty(name, false);
        } else if (reader.matches(JsopReader.STRING)) {
            String jsonString = reader.getToken();
            if (jsonString.startsWith(TypeCodes.EMPTY_ARRAY)) {
                int type = PropertyType.valueFromName(jsonString.substring(TypeCodes.EMPTY_ARRAY.length()));
                return PropertyStates.createProperty(name, emptyList(), Type.fromTag(type, true));
            }
            int split = TypeCodes.split(jsonString);
            if (split != -1) {
                int type = TypeCodes.decodeType(split, jsonString);
                String value = TypeCodes.decodeName(split, jsonString);
                if (type == PropertyType.BINARY) {

                    return  BinaryPropertyState.binaryProperty(name, store.getBlobFromBlobId(value));
                } else {
                    return createProperty(name, StringCache.get(value), type);
                }
            } else {
                return StringPropertyState.stringProperty(name, StringCache.get(jsonString));
            }
        } else {
            throw new IllegalArgumentException("Unexpected token: " + reader.getToken());
        }
    }

    /**
     * Read a multi valued {@code PropertyState} from a {@link JsopReader}.
     *
     * @param name the name of the property state
     * @param reader the reader
     * @return new property state
     */
    PropertyState readArrayProperty(String name, JsopReader reader) {
        return readArrayProperty(name, store, reader);
    }

    /**
     * Read a multi valued {@code PropertyState} from a {@link JsopReader}.
     *
     * @param name the name of the property state
     * @param store the store
     * @param reader the reader
     * @return new property state
     */
    static PropertyState readArrayProperty(String name, DocumentNodeStore store, JsopReader reader) {
        int type = PropertyType.STRING;
        List<Object> values = Lists.newArrayList();
        while (!reader.matches(']')) {
            if (reader.matches(JsopReader.NUMBER)) {
                String number = reader.getToken();
                try {
                    type = PropertyType.LONG;
                    values.add(Long.parseLong(number));
                } catch (NumberFormatException e) {
                    type = PropertyType.DOUBLE;
                    values.add(Double.parseDouble(number));
                }
            } else if (reader.matches(JsopReader.TRUE)) {
                type = PropertyType.BOOLEAN;
                values.add(true);
            } else if (reader.matches(JsopReader.FALSE)) {
                type = PropertyType.BOOLEAN;
                values.add(false);
            } else if (reader.matches(JsopReader.STRING)) {
                String jsonString = reader.getToken();
                int split = TypeCodes.split(jsonString);
                if (split != -1) {
                    type = TypeCodes.decodeType(split, jsonString);
                    String value = TypeCodes.decodeName(split, jsonString);
                    if (type == PropertyType.BINARY) {
                        values.add(store.getBlobFromBlobId(value));
                    } else if (type == PropertyType.DOUBLE) {
                        values.add(Conversions.convert(value).toDouble());
                    } else if (type == PropertyType.DECIMAL) {
                        values.add(Conversions.convert(value).toDecimal());
                    } else {
                        values.add(StringCache.get(value));
                    }
                } else {
                    type = PropertyType.STRING;
                    values.add(StringCache.get(jsonString));
                }
            } else {
                throw new IllegalArgumentException("Unexpected token: " + reader.getToken());
            }
            reader.matches(',');
        }
        return createProperty(name, values, Type.fromTag(type, true));
    }
}
