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/**
 * The MIT License (MIT)
 *
 * Copyright (c) 2011-2016 Incapture Technologies LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package rapture.table.memory;

import rapture.common.TableQuery;
import rapture.common.TableQueryResult;
import rapture.common.TableRecord;
import rapture.common.model.DocumentMetadata;
import rapture.dsl.iqry.IndexQuery;
import rapture.dsl.iqry.IndexQueryFactory;
import rapture.dsl.iqry.OrderDirection;
import rapture.dsl.iqry.WhereClause;
import rapture.dsl.iqry.WhereExtension;
import rapture.dsl.iqry.WhereStatement;
import rapture.index.IndexHandler;
import rapture.index.IndexProducer;
import rapture.index.IndexRecord;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;

import com.google.common.base.Predicate;

/*
 * An in memory table, primarily for testing
 * 
 */
public class MemoryIndexHandler implements IndexHandler {
    protected static Logger log = Logger.getLogger(MemoryIndexHandler.class);

    protected Map> memoryView = null;
    private IndexProducer indexProducer;

    public MemoryIndexHandler() {
        reset();
    }

    @Override
    public void deleteTable() {
        log.info("Removing index content ");
        memoryView.clear();
    }

    @Override
    public void removeAll(String rowId) {
        memoryView.put(rowId, new HashMap());
    }

    private void reset() {
        memoryView = new HashMap<>();
    }

    @Override
    public void setConfig(Map config) {
        log.info("Creating memory queue with config " + config.toString());
        reset();
    }

    @Override
    public void addedRecord(String key, String value, DocumentMetadata mdLatest) {
        List records = indexProducer.getIndexRecords(key, value, mdLatest);
        for (IndexRecord record : records) {
            memoryView.put(key, record.getValues());
            memoryView.get(key).put(ROWID, key);
        }
    }

    @Override
    public void updateRow(String key, Map recordValues) {
        memoryView.put(key, recordValues);
    }

    @Override
    public void ensureIndicesExist() {
        //noop
    }

    @Override
    public List queryTable(TableQuery query) {
        return new ArrayList();
    }

    @Override
    public void setInstanceName(String instanceName) {
        //unused -- ignore
    }

    @Override
    public TableQueryResult query(String query) {
        TableQueryResult result = new TableQueryResult();
        IndexQuery indexQuery = IndexQueryFactory.parseQuery(query);
        Map> data = memoryView;
        List>> predicates = predicatesFromQuery(indexQuery);

        List columnNames = indexQuery.getSelect().getFieldList();
        result.setColumnNames(columnNames);
        List> rows = new LinkedList<>();
        for (Map.Entry> mainEntry : data.entrySet()) {
            boolean isGood = true;
            Map body = mainEntry.getValue();
            for (Predicate> predicate : predicates) {
                isGood = predicate.apply(body);
                if (!isGood) {
                    break;
                }
            }
            if (isGood) {
                List