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/*
 *  Copyright 2024 Budapest University of Technology and Economics
 *
 *  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.
 */
package hu.bme.mit.theta.xta.analysis.lazy;

import java.util.Collection;

import hu.bme.mit.theta.analysis.State;
import hu.bme.mit.theta.analysis.algorithm.arg.ArgEdge;
import hu.bme.mit.theta.analysis.algorithm.arg.ArgNode;
import hu.bme.mit.theta.analysis.zone.ZoneState;
import hu.bme.mit.theta.xta.XtaSystem;
import hu.bme.mit.theta.xta.analysis.XtaAction;
import hu.bme.mit.theta.xta.analysis.lazy.LazyXtaStatistics.Builder;
import hu.bme.mit.theta.xta.analysis.zone.itp.ItpZoneState;

final class FwItpZoneStrategy extends ItpZoneStrategy {

    public FwItpZoneStrategy(final XtaSystem system, final Lens lens) {
        super(system, lens);
    }

    @Override
    protected ZoneState blockZone(final ArgNode node, final ZoneState zone,
                                  final Collection> uncoveredNodes, final Builder stats) {
        final ZoneState abstrState = getLens().get(node.getState()).getAbstrState();
        if (abstrState.isConsistentWith(zone)) {
            stats.refineZone();
            if (node.getInEdge().isPresent()) {
                final ArgEdge inEdge = node.getInEdge().get();
                final XtaAction action = inEdge.getAction();
                final ArgNode parent = inEdge.getSource();

                final ZoneState B_pre = pre(zone, action);
                final ZoneState A_pre = blockZone(parent, B_pre, uncoveredNodes, stats);

                final ZoneState B = zone;
                final ZoneState A = post(A_pre, action);

                final ZoneState interpolant = ZoneState.interpolant(A, B);

                strengthen(node, interpolant);
                maintainCoverage(node, interpolant, uncoveredNodes);

                return interpolant;
            } else {
                final ZoneState concrState = getLens().get(node.getState()).getConcrState();

                final ZoneState interpolant = ZoneState.interpolant(concrState, zone);

                strengthen(node, interpolant);
                maintainCoverage(node, interpolant, uncoveredNodes);

                return interpolant;
            }
        } else {
            return abstrState;
        }
    }

}