package edu.hm.hafner.analysis.parser;

import java.io.Serial;
import java.util.Optional;
import java.util.regex.Matcher;

import edu.hm.hafner.analysis.Issue;
import edu.hm.hafner.analysis.IssueBuilder;
import edu.hm.hafner.analysis.LookaheadParser;
import edu.hm.hafner.analysis.Severity;
import edu.hm.hafner.util.LookaheadStream;

/**
 * A parser for the clang-tidy static analysis warnings parsed by Codechecker. Codechecker parses the {@code *.plist}
 * files and converts it into plain text file.
 *
 * <p>
 * Better for human readers and for using grep and diff. It also puts the human-readable Severity at the start of a
 * line.
 * </p>
 */
public class CodeCheckerParser extends LookaheadParser {
    @Serial
    private static final long serialVersionUID = -3015592762345283582L;
    private static final String CODE_CHECKER_DEFECT_PATTERN =
            "^\\[(?<severity>CRITICAL|HIGH|MEDIUM|LOW|UNSPECIFIED|STYLE)\\] (?<path>.+):(?<line>\\d+):(?<column>\\d+): (?<message>.*?) \\[(?<category>[^\\s]*?)\\]$";

    /**
     * Creates a new instance of {@link CodeCheckerParser}.
     */
    public CodeCheckerParser() {
        super(CODE_CHECKER_DEFECT_PATTERN);
    }

    @Override
    protected Optional<Issue> createIssue(final Matcher matcher, final LookaheadStream lookahead,
            final IssueBuilder builder) {
        var severity = getSeverity(matcher.group("severity"));
        return builder.setFileName(matcher.group("path"))
                .setSeverity(severity)
                .setLineStart(matcher.group("line"))
                .setColumnStart(matcher.group("column"))
                .setCategory(matcher.group("category"))
                .setMessage(matcher.group("message"))
                .buildOptional();
    }

    private Severity getSeverity(final String severityText) {
        if (severityText.contains("CRITICAL")) {
            return Severity.ERROR;
        }
        if (severityText.contains("HIGH")) {
            return Severity.WARNING_HIGH;
        }
        if (severityText.contains("MEDIUM")) {
            return Severity.WARNING_NORMAL;
        }
        return Severity.WARNING_LOW;
    }
}
