/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, a notice that is now available elsewhere in this distribution
 * accompanied the original version of this file, and, per its terms,
 * should not be removed.
 */

package jdk.internal.org.commonmark.renderer.html;

import jdk.internal.org.commonmark.internal.util.Escaping;

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

public class HtmlWriter {

    private static final Map<String, String> NO_ATTRIBUTES = Collections.emptyMap();

    private final Appendable buffer;
    private char lastChar = 0;

    public HtmlWriter(Appendable out) {
        if (out == null) {
            throw new NullPointerException("out must not be null");
        }
        this.buffer = out;
    }

    public void raw(String s) {
        append(s);
    }

    public void text(String text) {
        append(Escaping.escapeHtml(text));
    }

    public void tag(String name) {
        tag(name, NO_ATTRIBUTES);
    }

    public void tag(String name, Map<String, String> attrs) {
        tag(name, attrs, false);
    }

    public void tag(String name, Map<String, String> attrs, boolean voidElement) {
        append("<");
        append(name);
        if (attrs != null && !attrs.isEmpty()) {
            for (Map.Entry<String, String> attrib : attrs.entrySet()) {
                append(" ");
                append(Escaping.escapeHtml(attrib.getKey()));
                append("=\"");
                append(Escaping.escapeHtml(attrib.getValue()));
                append("\"");
            }
        }
        if (voidElement) {
            append(" /");
        }

        append(">");
    }

    public void line() {
        if (lastChar != 0 && lastChar != '\n') {
            append("\n");
        }
    }

    protected void append(String s) {
        try {
            buffer.append(s);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        int length = s.length();
        if (length != 0) {
            lastChar = s.charAt(length - 1);
        }
    }
}