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/*
 * DISCLAIMER
 *
 * Copyright 2016 ArangoDB GmbH, Cologne, Germany
 *
 * 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.
 *
 * Copyright holder is ArangoDB GmbH, Cologne, Germany
 */

package com.arangodb.internal.cursor;

import com.arangodb.ArangoCursor;
import com.arangodb.ArangoIterator;
import com.arangodb.entity.CursorStats;
import com.arangodb.entity.CursorWarning;
import com.arangodb.internal.ArangoCursorExecute;
import com.arangodb.internal.InternalArangoDatabase;
import com.arangodb.internal.cursor.entity.InternalCursorEntity;
import com.arangodb.shaded.fasterxml.jackson.databind.JsonNode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.NoSuchElementException;
import java.util.List;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;

/**
 * @author Mark Vollmary
 */
public class ArangoCursorImpl implements ArangoCursor {
    private final static Logger LOG = LoggerFactory.getLogger(ArangoCursorImpl.class);

    protected final ArangoCursorIterator iterator;
    private final Class type;
    private final String id;
    private final ArangoCursorExecute execute;
    private final boolean pontentialDirtyRead;
    private final boolean allowRetry;

    public ArangoCursorImpl(final InternalArangoDatabase db, final ArangoCursorExecute execute,
                            final Class type, final InternalCursorEntity result) {
        super();
        this.execute = execute;
        this.type = type;
        id = result.getId();
        pontentialDirtyRead = result.isPontentialDirtyRead();
        iterator = new ArangoCursorIterator<>(id, type, execute, db, result);
        this.allowRetry = result.getNextBatchId() != null;
    }

    @Override
    public void close() {
        if (getId() != null && (allowRetry || iterator.result.getHasMore())) {
            getExecute().close(getId());
        }
    }

    @Override
    public T next() {
        return iterator.next();
    }

    @Override
    public String getId() {
        return id;
    }

    @Override
    public Class getType() {
        return type;
    }

    @Override
    public Integer getCount() {
        return iterator.result.getCount();
    }

    @Override
    public CursorStats getStats() {
        final InternalCursorEntity.Extras extra = iterator.result.getExtra();
        return extra != null ? extra.getStats() : null;
    }

    @Override
    public Collection getWarnings() {
        final InternalCursorEntity.Extras extra = iterator.result.getExtra();
        return extra != null ? extra.getWarnings() : null;
    }

    @Override
    public boolean isCached() {
        final Boolean cached = iterator.result.getCached();
        return Boolean.TRUE.equals(cached);
    }

    @Override
    public boolean hasNext() {
        return iterator.hasNext();
    }

    @Override
    public List asListRemaining() {
        final List remaining = new ArrayList<>();
        while (hasNext()) {
            remaining.add(next());
        }
        try {
            close();
        } catch (final Exception e) {
            LOG.warn("Could not close cursor: ", e);
        }
        return remaining;
    }

    @Override
    public boolean isPotentialDirtyRead() {
        return pontentialDirtyRead;
    }

    @Override
    public ArangoIterator iterator() {
        return iterator;
    }

    @Override
    public String getNextBatchId() {
        return iterator.result.getNextBatchId();
    }

    protected ArangoCursorExecute getExecute() {
        return execute;
    }

    public Stream stream() {
        return StreamSupport.stream(spliterator(), false);
    }

    protected static class ArangoCursorIterator implements ArangoIterator {
        private final String cursorId;
        private final Class type;
        private final InternalArangoDatabase db;
        private final ArangoCursorExecute execute;
        private InternalCursorEntity result;
        private Iterator arrayIterator;

        protected ArangoCursorIterator(final String cursorId, final Class type, final ArangoCursorExecute execute,
                                       final InternalArangoDatabase db, final InternalCursorEntity result) {
            this.cursorId = cursorId;
            this.type = type;
            this.execute = execute;
            this.db = db;
            this.result = result;
            arrayIterator = result.getResult().iterator();
        }

        @Override
        public boolean hasNext() {
            return arrayIterator.hasNext() || result.getHasMore();
        }

        @Override
        public T next() {
            if (!arrayIterator.hasNext() && Boolean.TRUE.equals(result.getHasMore())) {
                result = execute.next(cursorId, result.getNextBatchId());
                arrayIterator = result.getResult().iterator();
            }
            if (!hasNext()) {
                throw new NoSuchElementException();
            }
            return deserialize(db.getSerde().serialize(arrayIterator.next()), type);
        }

        private  R deserialize(final byte[] result, final Class type) {
            return db.getSerde().deserializeUserData(result, type);
        }

    }

}