/**
 * Copyright (C) 2009-2013 FoundationDB, LLC
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.foundationdb.sql.optimizer.rule;

import com.foundationdb.ais.model.AkibanInformationSchema;

import com.foundationdb.server.rowdata.SchemaFactory;

import org.yaml.snakeyaml.Yaml;

import java.util.ArrayList;
import java.util.List;
import java.io.File;
import java.io.FileInputStream;

public class RulesTestHelper
{
    private RulesTestHelper() {
    }

    public static List<BaseRule> loadRules(File file) throws Exception {
        Yaml yaml = new Yaml();
        FileInputStream istr = new FileInputStream(file);
        List list = yaml.loadAs(istr, List.class );
        istr.close();
        return parseRules(list);
    }

    public static List<BaseRule> parseRules(String str) throws Exception {
        Yaml yaml = new Yaml();
        List list = yaml.loadAs(str, List.class);
        return parseRules(list);
    }

    public static List<BaseRule> parseRules(List list) throws Exception {
        List<BaseRule> result = new ArrayList<>();
        for (Object obj : list) {
            if (obj instanceof String) {
                String cname = (String)obj;
                if (cname.indexOf('.') < 0)
                    cname = RulesTestHelper.class.getPackage().getName() + '.' + cname;
                result.add((BaseRule)Class.forName(cname).newInstance());
            }
            else {
                // TODO: Someday parse options from hash, etc.
                throw new Exception("Don't know what to do with " + obj);
            }
        }
        return result;
    }

    // Make fake row def cache to keep TableRowType constructor
    // and Index.getAllColumns() from getting NPE.
    public static void ensureRowDefs(AkibanInformationSchema ais) {
        new SchemaFactory().buildRowDefs(ais);
    }
}