/**
 * Licensed to Apereo under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright ownership. Apereo
 * 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 the
 * following location:
 *
 * <p>http://www.apache.org/licenses/LICENSE-2.0
 *
 * <p>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.apereo.portal.io;

import org.apereo.portal.ICounterStore;
import org.apereo.portal.spring.locator.CounterStoreLocator;
import org.danann.cernunnos.EntityConfig;
import org.danann.cernunnos.Formula;
import org.danann.cernunnos.Phrase;
import org.danann.cernunnos.Reagent;
import org.danann.cernunnos.ReagentType;
import org.danann.cernunnos.SimpleFormula;
import org.danann.cernunnos.SimpleReagent;
import org.danann.cernunnos.TaskRequest;
import org.danann.cernunnos.TaskResponse;

/**
 */
public class SequenceGeneratorPhrase implements Phrase {

    public static final Reagent SEQ_NAME =
            new SimpleReagent(
                    "SEQ_NAME",
                    "descendant-or-self::text()",
                    ReagentType.PHRASE,
                    String.class,
                    "Name of the sequence to return the next id for");

    // Instance Members.
    private Phrase seqNamePhrase;

    /* (non-Javadoc)
     * @see org.danann.cernunnos.Bootstrappable#init(org.danann.cernunnos.EntityConfig)
     */
    public void init(EntityConfig config) {
        this.seqNamePhrase = (Phrase) config.getValue(SEQ_NAME);
    }

    /* (non-Javadoc)
     * @see org.danann.cernunnos.Bootstrappable#getFormula()
     */
    public Formula getFormula() {
        return new SimpleFormula(SequenceGeneratorPhrase.class, new Reagent[] {SEQ_NAME});
    }

    /* (non-Javadoc)
     * @see org.danann.cernunnos.Phrase#evaluate(org.danann.cernunnos.TaskRequest, org.danann.cernunnos.TaskResponse)
     */
    public Object evaluate(TaskRequest req, TaskResponse res) {
        final String seqName = (String) this.seqNamePhrase.evaluate(req, res);

        final ICounterStore counterStore = CounterStoreLocator.getCounterStore();
        try {
            return counterStore.getNextId(seqName);
        } catch (Exception e) {
            throw new RuntimeException(
                    "Failed to retrieve next sequence in for sequance '" + seqName + "'", e);
        }
    }

    protected String getSafeFileName(String name) {
        //Replace slashes with .
        name = name.replaceAll("/|\\\\", ".");

        //Replace all non-ok char with _
        name = name.replaceAll("[^a-zA-Z0-9_.-]", "_");

        return name;
    }
}