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/**
 * SPDX-FileCopyrightText: (c) 2000 Liferay, Inc. https://liferay.com
 * SPDX-License-Identifier: LGPL-2.1-or-later OR LicenseRef-Liferay-DXP-EULA-2.0.0-2023-06
 */

package com.liferay.source.formatter.check;

import com.liferay.petra.string.StringPool;
import com.liferay.portal.kernel.util.StringUtil;
import com.liferay.source.formatter.check.util.JSPSourceUtil;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author Hugo Huijser
 */
public class JSPEmptyLinesCheck extends BaseEmptyLinesCheck {

	@Override
	protected String doProcess(
		String fileName, String absolutePath, String content) {

		content = fixMissingEmptyLines(absolutePath, content);

		content = fixMissingEmptyLinesAroundComments(content);

		content = fixRedundantEmptyLines(content);

		content = fixIncorrectEmptyLineAfterOpenCurlyBrace(content);

		content = fixIncorrectEmptyLineBeforeCloseCurlyBrace(content);

		content = fixMissingEmptyLineAfterSettingVariable(content);

		content = fixEmptyLinesInMultiLineTags(content);

		content = fixEmptyLinesInNestedTags(content);

		content = fixEmptyLinesBetweenTags(content);

		content = _fixMissingEmptyLines(content);

		content = _fixRedundantEmptyLines(content);

		return content;
	}

	private String _fixMissingEmptyLines(String content) {
		Matcher matcher = _missingEmptyLinePattern1.matcher(content);

		while (matcher.find()) {
			if (!JSPSourceUtil.isJSSource(content, matcher.start())) {
				return StringUtil.replaceFirst(
					content, "\n", "\n\n", matcher.start() + 1);
			}
		}

		matcher = _missingEmptyLinePattern2.matcher(content);

		while (matcher.find()) {
			if (!JSPSourceUtil.isJSSource(content, matcher.start())) {
				return StringUtil.replaceFirst(
					content, "\n", "\n\n", matcher.start());
			}
		}

		matcher = _missingEmptyLinePattern3.matcher(content);

		while (matcher.find()) {
			if (!JSPSourceUtil.isJSSource(content, matcher.start())) {
				return StringUtil.replaceFirst(
					content, "\n", "\n\n", matcher.start() + 1);
			}
		}

		matcher = _missingEmptyLinePattern4.matcher(content);

		while (matcher.find()) {
			if (!JSPSourceUtil.isJSSource(content, matcher.start())) {
				return StringUtil.replaceFirst(
					content, "\n", "\n\n", matcher.start() + 1);
			}
		}

		return content;
	}

	private String _fixRedundantEmptyLines(String content) {
		Matcher matcher = _redundantEmptyLinePattern1.matcher(content);

		while (matcher.find()) {
			if (!JSPSourceUtil.isJSSource(content, matcher.start())) {
				return StringUtil.replaceFirst(
					content, "\n", StringPool.BLANK, matcher.start() + 1);
			}
		}

		matcher = _redundantEmptyLinePattern2.matcher(content);

		while (matcher.find()) {
			if (!JSPSourceUtil.isJSSource(content, matcher.start())) {
				return StringUtil.replaceFirst(
					content, "\n", StringPool.BLANK, matcher.start() + 1);
			}
		}

		return content;
	}

	private static final Pattern _missingEmptyLinePattern1 = Pattern.compile(
		"[\t\n](--)?%>\n\t*(?!-->)\\S");
	private static final Pattern _missingEmptyLinePattern2 = Pattern.compile(
		"\\S(?!<\\!--)\n\t*<%(--|\\!)?\n");
	private static final Pattern _missingEmptyLinePattern3 = Pattern.compile(
		"[\t\n]<%\\!?\n\t*//");
	private static final Pattern _missingEmptyLinePattern4 = Pattern.compile(
		"[\t\n]//.*\n\t*%>\n");
	private static final Pattern _redundantEmptyLinePattern1 = Pattern.compile(
		"[\n\t]<%\\!?\n\n(\t*)[^/\n\t]");
	private static final Pattern _redundantEmptyLinePattern2 = Pattern.compile(
		"[\n\t][^/\n\t].*\n\n\t*%>");

}