/**
 * Replication Benchmarker
 * https://github.com/score-team/replication-benchmarker/
 * Copyright (C) 2013 LORIA / Inria / SCORE Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package jbenchmarker.jupiter;

import java.util.LinkedList;
import java.util.List;
import jbenchmarker.core.LocalOperation;
import crdt.Operation;
import jbenchmarker.core.SequenceOperation;
import jbenchmarker.core.SequenceOperation.OpType;

/**
 * Basic OT Sequence model. Only insert and delete operation. One operation per character.  
 * @author urso
 */
public class SequenceModel implements OTModel<String> {
    private final StringBuilder content = new StringBuilder();
    
    @Override
    public String lookup() {
        return content.toString();
    }

    @Override
    public List<OTOperation> generate(LocalOperation local) {
        SequenceOperation op = (SequenceOperation) local;
        List<OTOperation> ops = new LinkedList<OTOperation>();
        if (op.getType() == OpType.delete || op.getType() == OpType.replace) {
            for (int i = 0; i < op.getLenghOfADel(); ++i) {
                ops.add(new SequenceOTOperation(op.getPosition()));
            }
            content.delete(op.getPosition(), op.getPosition() + op.getLenghOfADel());
        }
        if (op.getType() == OpType.insert || op.getType() == OpType.replace) {
            for (int i = 0; i < op.getContent().size(); ++i) {
                ops.add(new SequenceOTOperation(op.getPosition() + i, (Character) op.getContent().get(i)));
            }
            content.insert(op.getPosition(), op.getContentAsString()); 
        }
        return ops;
    }

    @Override
    public OTOperation transform(OTOperation msg, OTOperation op) {
        throw new UnsupportedOperationException("Not supported yet.");
    }

    @Override
    public void apply(OTOperation msg) {
        SequenceOTOperation op = (SequenceOTOperation) msg;
        if (op.type == OpType.insert) {
            content.insert(op.position, op.content);
        } else {
            content.delete(op.position, op.position + 1);
        }
    }

    
    static class SequenceOTOperation implements OTOperation {
        int replicaNumber;
        int position;
        char content;
        OpType type;

        // A DEL
        SequenceOTOperation(int position) {
            this.position = position;
            this.type = OpType.delete;
        }
        
        // AN INS 
        SequenceOTOperation(int position, char content) {
            this.position = position;
            this.content = content;
            this.type = OpType.insert;
        }

        private SequenceOTOperation(int replicaNumber, int position, char content, OpType type) {
            this.replicaNumber = replicaNumber;
            this.position = position;
            this.content = content;
            this.type = type;
        }

        @Override
        public Operation clone() {
            return new SequenceOTOperation(replicaNumber, position, content, type);
        }

        @Override
        public void setReplicaNumber(int replicaNumber) {
            this.replicaNumber = replicaNumber;
        }        
    }
}