/*
 * Copyright (C) 2019-2022 LitterBox contributors
 *
 * This file is part of LitterBox.
 *
 * LitterBox 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.
 *
 * LitterBox 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 LitterBox. If not, see <http://www.gnu.org/licenses/>.
 */
package de.uni_passau.fim.se2.litterbox.analytics.bugpattern;

import de.uni_passau.fim.se2.litterbox.analytics.AbstractIssueFinder;
import de.uni_passau.fim.se2.litterbox.analytics.Issue;
import de.uni_passau.fim.se2.litterbox.analytics.IssueSeverity;
import de.uni_passau.fim.se2.litterbox.analytics.IssueType;
import de.uni_passau.fim.se2.litterbox.ast.model.Program;
import de.uni_passau.fim.se2.litterbox.ast.model.expression.string.Answer;
import de.uni_passau.fim.se2.litterbox.ast.model.statement.actorlook.AskAndWait;
import de.uni_passau.fim.se2.litterbox.utils.Preconditions;

import java.util.ArrayList;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

public class MissingAsk extends AbstractIssueFinder  {

    private List<Answer> answerBlocks = new ArrayList<>();
    private boolean askUsed = false;

    @Override
    public Set<Issue> check(Program program) {
        Preconditions.checkNotNull(program);
        this.program = program;
        issues = new LinkedHashSet<>();
        answerBlocks = new ArrayList<>();
        askUsed = false;
        program.accept(this);

        if (!answerBlocks.isEmpty() && !askUsed) {
            for (Answer answer : answerBlocks) {
                addIssue(answer, answer.getMetadata(), IssueSeverity.MEDIUM);
            }
        }

        return issues;
    }

    @Override
    public void visit(AskAndWait node) {
        askUsed = true;
    }

    @Override
    public void visit(Answer node) {
        answerBlocks.add(node);
    }

    @Override
    public IssueType getIssueType() {
        return IssueType.BUG;
    }

    @Override
    public String getName() {
        return "missing_ask";
    }
}
