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package com.greenpepper.runner.dialect;

import static com.greenpepper.shaded.org.apache.commons.lang3.StringUtils.isBlank;

import java.io.IOException;
import java.io.StringReader;
import java.util.Collections;

import com.greenpepper.shaded.org.jsoup.Jsoup;
import com.greenpepper.shaded.org.jsoup.nodes.Document;
import com.greenpepper.shaded.org.slf4j.Logger;
import com.greenpepper.shaded.org.slf4j.LoggerFactory;

import com.greenpepper.dialect.SpecificationDialect;
import com.greenpepper.dialect.SpecificationDialectException;
import com.greenpepper.shaded.com.vladsch.flexmark.ast.Node;
import com.greenpepper.shaded.com.vladsch.flexmark.ext.tables.TablesExtension;
import com.greenpepper.shaded.com.vladsch.flexmark.html.HtmlRenderer;
import com.greenpepper.shaded.com.vladsch.flexmark.parser.Parser;
import com.greenpepper.shaded.com.vladsch.flexmark.util.options.MutableDataSet;

public class MarkdownDialect implements SpecificationDialect {

    private static final Logger LOGGER = LoggerFactory.getLogger(MarkdownDialect.class);
    private static final String EMPTY_STRING = "";

    private final Parser parser;
    private final HtmlRenderer renderer;

    public MarkdownDialect() {
        MutableDataSet options = new MutableDataSet()
                .set(Parser.EXTENSIONS, Collections.singletonList(TablesExtension.create()));
        parser = Parser.builder(options).build();
        renderer = HtmlRenderer.builder(options).build();
    }

    @Override
    public String convert(String input) throws SpecificationDialectException {
        try {
            if (isBlank(input)) {
                return EMPTY_STRING;
            }
            Node document = parser.parseReader(new StringReader(input));
            String render = renderer.render(document);
            // Ensure the result starts with html tags
            Document jsoupDoc = Jsoup.parse(render);
            LOGGER.debug("converted HTML:\n {}", jsoupDoc);
            return jsoupDoc.toString();
        } catch (IOException e) {
            throw new SpecificationDialectException("Can't parse the input.", e);
        }
    }
}