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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.zone;

import com.google.common.collect.Lists;
import hu.bme.mit.theta.analysis.zone.ZonePrec;
import hu.bme.mit.theta.analysis.zone.ZoneState;
import hu.bme.mit.theta.core.clock.op.ResetOp;
import hu.bme.mit.theta.core.decl.VarDecl;
import hu.bme.mit.theta.core.type.rattype.RatType;
import hu.bme.mit.theta.xta.Guard;
import hu.bme.mit.theta.xta.Update;
import hu.bme.mit.theta.xta.XtaProcess.Edge;
import hu.bme.mit.theta.xta.XtaProcess.Loc;
import hu.bme.mit.theta.xta.XtaProcess.LocKind;
import hu.bme.mit.theta.xta.analysis.XtaAction;
import hu.bme.mit.theta.xta.analysis.XtaAction.BasicXtaAction;
import hu.bme.mit.theta.xta.analysis.XtaAction.BinaryXtaAction;
import hu.bme.mit.theta.xta.analysis.XtaAction.BroadcastXtaAction;

import java.util.Collection;
import java.util.List;

import static com.google.common.base.Preconditions.checkNotNull;
import static hu.bme.mit.theta.core.clock.constr.ClockConstrs.Eq;

public final class XtaZoneUtils {

    private XtaZoneUtils() {
    }

    public static ZoneState post(final ZoneState state, final XtaAction action,
                                 final ZonePrec prec) {
        checkNotNull(state);
        checkNotNull(action);
        checkNotNull(prec);

        if (action.isBasic()) {
            return postForBasicAction(state, action.asBasic(), prec);
        } else if (action.isBinary()) {
            return postForBinaryAction(state, action.asBinary(), prec);
        } else if (action.isBroadcast()) {
            return postForBroadcastAction(state, action.asBroadcast(), prec);
        } else {
            throw new AssertionError();
        }
    }

    private static ZoneState postForBasicAction(final ZoneState state, final BasicXtaAction action,
                                                final ZonePrec prec) {
        final ZoneState.Builder succStateBuilder = state.project(prec.getVars());

        final List sourceLocs = action.getSourceLocs();
        final Edge edge = action.getEdge();
        final List targetLocs = action.getTargetLocs();

        applyInvariants(succStateBuilder, sourceLocs);
        applyGuards(succStateBuilder, edge);
        applyUpdates(succStateBuilder, edge);
        applyInvariants(succStateBuilder, targetLocs);
        if (shouldApplyDelay(action.getTargetLocs())) {
            applyDelay(succStateBuilder);
        }

        final ZoneState succState = succStateBuilder.build();
        return succState;
    }

    private static ZoneState postForBinaryAction(final ZoneState state,
                                                 final BinaryXtaAction action,
                                                 final ZonePrec prec) {
        final ZoneState.Builder succStateBuilder = state.project(prec.getVars());

        final List sourceLocs = action.getSourceLocs();
        final Edge emittingEdge = action.getEmitEdge();
        final Edge receivingEdge = action.getRecvEdge();
        final List targetLocs = action.getTargetLocs();

        applyInvariants(succStateBuilder, sourceLocs);
        applyGuards(succStateBuilder, emittingEdge);
        applyGuards(succStateBuilder, receivingEdge);
        applyUpdates(succStateBuilder, emittingEdge);
        applyUpdates(succStateBuilder, receivingEdge);
        applyInvariants(succStateBuilder, targetLocs);

        if (shouldApplyDelay(targetLocs)) {
            applyDelay(succStateBuilder);
        }

        final ZoneState succState = succStateBuilder.build();
        return succState;
    }

    private static ZoneState postForBroadcastAction(final ZoneState state,
                                                    final BroadcastXtaAction action,
                                                    final ZonePrec prec) {
        final ZoneState.Builder succStateBuilder = state.project(prec.getVars());

        final List sourceLocs = action.getSourceLocs();
        final Edge emitEdge = action.getEmitEdge();
        final List recvEdges = action.getRecvEdges();
        final List> nonRecvEdgeCols = action.getNonRecvEdges();
        final List targetLocs = action.getTargetLocs();

        applyInvariants(succStateBuilder, sourceLocs);
        applyGuards(succStateBuilder, emitEdge);

        if (recvEdges.stream().anyMatch(XtaZoneUtils::hasClockGuards)) {
            throw new UnsupportedOperationException(
                    "Clock guards on edges with broadcast synchronization labels are not supported.");
        }

        if (nonRecvEdgeCols.stream()
                .anyMatch(c -> c.stream().anyMatch(XtaZoneUtils::hasClockGuards))) {
            throw new UnsupportedOperationException(
                    "Clock guards on edges with broadcast synchronization labels are not supported.");
        }

        applyUpdates(succStateBuilder, emitEdge);
        recvEdges.stream().forEachOrdered(recvEdge -> applyUpdates(succStateBuilder, recvEdge));
        applyInvariants(succStateBuilder, targetLocs);

        if (shouldApplyDelay(targetLocs)) {
            applyDelay(succStateBuilder);
        }

        final ZoneState succState = succStateBuilder.build();
        return succState;
    }

    private static boolean hasClockGuards(Edge edge) {
        return edge.getGuards().stream().anyMatch(Guard::isClockGuard);
    }

    ////

    public static ZoneState pre(final ZoneState state, final XtaAction action,
                                final ZonePrec prec) {
        checkNotNull(state);
        checkNotNull(action);
        checkNotNull(prec);

        if (action.isBasic()) {
            return preForBasicAction(state, action.asBasic(), prec);
        } else if (action.isBinary()) {
            return preForBinaryAction(state, action.asBinary(), prec);
        } else if (action.isBroadcast()) {
            return preForBroadcastAction(state, action.asBroadcast(), prec);
        } else {
            throw new AssertionError();
        }
    }

    private static ZoneState preForBasicAction(final ZoneState state, final BasicXtaAction action,
                                               final ZonePrec prec) {
        final ZoneState.Builder preStateBuilder = state.project(prec.getVars());

        final List sourceLocs = action.getSourceLocs();
        final Edge edge = action.getEdge();
        final List targetLocs = action.getTargetLocs();

        if (shouldApplyDelay(action.getTargetLocs())) {
            applyInverseDelay(preStateBuilder);
        }
        applyInvariants(preStateBuilder, targetLocs);
        applyInverseUpdates(preStateBuilder, edge);
        applyGuards(preStateBuilder, edge);
        applyInvariants(preStateBuilder, sourceLocs);

        final ZoneState preState = preStateBuilder.build();
        return preState;
    }

    private static ZoneState preForBinaryAction(final ZoneState state, final BinaryXtaAction action,
                                                final ZonePrec prec) {
        final ZoneState.Builder preStateBuilder = state.project(prec.getVars());

        final List sourceLocs = action.getSourceLocs();
        final Edge emitEdge = action.getEmitEdge();
        final Edge recvEdge = action.getRecvEdge();
        final List targetLocs = action.getTargetLocs();

        if (shouldApplyDelay(action.getTargetLocs())) {
            applyInverseDelay(preStateBuilder);
        }
        applyInvariants(preStateBuilder, targetLocs);
        applyInverseUpdates(preStateBuilder, recvEdge);
        applyInverseUpdates(preStateBuilder, emitEdge);
        applyGuards(preStateBuilder, recvEdge);
        applyGuards(preStateBuilder, emitEdge);
        applyInvariants(preStateBuilder, sourceLocs);

        final ZoneState succState = preStateBuilder.build();
        return succState;
    }

    private static ZoneState preForBroadcastAction(final ZoneState state,
                                                   final BroadcastXtaAction action,
                                                   final ZonePrec prec) {
        final ZoneState.Builder preStateBuilder = state.project(prec.getVars());

        final List sourceLocs = action.getSourceLocs();
        final Edge emitEdge = action.getEmitEdge();
        final List reverseRecvEdges = Lists.reverse(action.getRecvEdges());
        final List> nonRecvEdgeCols = action.getNonRecvEdges();
        final List targetLocs = action.getTargetLocs();

        if (shouldApplyDelay(action.getTargetLocs())) {
            applyInverseDelay(preStateBuilder);
        }
        applyInvariants(preStateBuilder, targetLocs);
        reverseRecvEdges.stream()
                .forEachOrdered(recvEdge -> applyInverseUpdates(preStateBuilder, recvEdge));
        applyInverseUpdates(preStateBuilder, emitEdge);

        if (nonRecvEdgeCols.stream()
                .anyMatch(c -> c.stream().anyMatch(XtaZoneUtils::hasClockGuards))) {
            throw new UnsupportedOperationException(
                    "Clock guards on edges with broadcast synchronization labels are not supported.");
        }

        if (reverseRecvEdges.stream().anyMatch(XtaZoneUtils::hasClockGuards)) {
            throw new UnsupportedOperationException(
                    "Clock guards on edges with broadcast synchronization labels are not supported.");
        }

        applyGuards(preStateBuilder, emitEdge);
        applyInvariants(preStateBuilder, sourceLocs);

        final ZoneState succState = preStateBuilder.build();
        return succState;
    }

    ////

    private static boolean shouldApplyDelay(final List locs) {
        return locs.stream().allMatch(l -> l.getKind() == LocKind.NORMAL);
    }

    private static void applyDelay(final ZoneState.Builder builder) {
        builder.nonnegative();
        builder.up();
    }

    private static void applyInverseDelay(final ZoneState.Builder builder) {
        builder.down();
        builder.nonnegative();
    }

    private static void applyInvariants(final ZoneState.Builder builder,
                                        final Collection locs) {
        for (final Loc target : locs) {
            for (final Guard invar : target.getInvars()) {
                if (invar.isClockGuard()) {
                    builder.and(invar.asClockGuard().getClockConstr());
                }
            }
        }
    }

    private static void applyUpdates(final ZoneState.Builder builder, final Edge edge) {
        for (final Update update : edge.getUpdates()) {
            if (update.isClockUpdate()) {
                final ResetOp op = (ResetOp) update.asClockUpdate().getClockOp();
                final VarDecl varDecl = op.getVar();
                final int value = op.getValue();
                builder.reset(varDecl, value);
            }
        }
    }

    private static void applyInverseUpdates(final ZoneState.Builder builder, final Edge edge) {
        for (final Update update : Lists.reverse(edge.getUpdates())) {
            if (update.isClockUpdate()) {
                final ResetOp op = (ResetOp) update.asClockUpdate().getClockOp();
                final VarDecl varDecl = op.getVar();
                final int value = op.getValue();
                builder.and(Eq(varDecl, value));
                builder.free(varDecl);
            }
        }
    }

    private static void applyGuards(final ZoneState.Builder builder, final Edge edge) {
        for (final Guard guard : edge.getGuards()) {
            if (guard.isClockGuard()) {
                builder.and(guard.asClockGuard().getClockConstr());
            }
        }
    }

}