package BlueTurtle.parsers;

import java.io.File;
import java.util.LinkedList;
import java.util.List;
import java.util.regex.Matcher;

import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import BlueTurtle.finders.ProjectInfoFinder;
import BlueTurtle.warnings.FindBugsWarning;
import BlueTurtle.warnings.Warning;

/**
 * This class can be used to parse a FindBugs XML output file.
 * 
 * @author BlueTurtle.
 *
 */
public class FindBugsXMLParser extends XMLParser {

	/**
	 * Parse a FindBugs report file.
	 * 
	 * @param xmlFilePath
	 *            the location of the FindBugs report.
	 * @return a list of FindBugs warnings.
	 */
	@Override
	public List<Warning> parseFile(String xmlFilePath) {

		// List to store the warnings.
		List<Warning> findBugsWarnings = new LinkedList<Warning>();

			// Get all list of files where there are warnings.
			NodeList nList = setUp(xmlFilePath);
			
			// if there are no files with warnings, there return an empty list of warnings.
			if (nList == null) { 
				return findBugsWarnings; 
			}

			for (int i = 0; i < nList.getLength(); i++) {
				// Get the file from the list.
				Node file = nList.item(i);

				if (file.getNodeType() == Node.ELEMENT_NODE) {
					// Convert the node to an element.
					Element fileElement = (Element) file;

					// Get the name of the file where the warning is from.
					String fileName = fileElement.getAttribute("classname");

					// Get all the warnings.
					NodeList warningList = fileElement.getElementsByTagName("BugInstance");

					addWarnings(fileName, warningList, findBugsWarnings, nList);
				}
			}

		return findBugsWarnings;
	}

	/**
	 * add individual warning to the warningList.
	 * 
	 * @param fileName
	 *            is the file name of the warning.
	 * @param warningList
	 *            is a list of warnings.
	 * @param nList
	 *            is the node list.
	 * @param findBugsWarnings
	 *            is the findBugs warnings.
	 */
	public void addWarnings(String fileName, NodeList warningList, List<Warning> findBugsWarnings, NodeList nList) {

		for (int j = 0; j < warningList.getLength(); j++) {
			// Get the warning from the list of warnings.
			Node warning = warningList.item(j);

			if (warning.getNodeType() == Node.ELEMENT_NODE) {
				// Convert the node to an element.
				Element warningElement = (Element) warning;

				// The message contained by the warning.
				String message = warningElement.getAttribute("message");

				// The category of warning.
				String category = warningElement.getAttribute("category");

				// The priority of warning, can be high or low.
				String priority = warningElement.getAttribute("priority");

				// line number where the warning is located.
				int line = Integer.parseInt(warningElement.getAttribute("lineNumber"));

				// Get the category of the warning.
				String ruleName = warningElement.getAttribute("type");

				String classification = classify(ruleName);

				// replace the dot in the file name with file separator.
				String fileNWithSep = fileName.replaceAll("\\.", Matcher.quoteReplacement(File.separator)) + ".java";

				// for-loop in stream.
				String filePath = ProjectInfoFinder.getClassPaths().stream().filter(p -> p.endsWith(fileNWithSep)).findFirst().get();

				// Get the name of the file where the warning is from.
				String finalFileName = fileNWithSep.substring(fileNWithSep.lastIndexOf(File.separatorChar) + 1, fileNWithSep.length());

				// Construct the new FindBugsWarning.
				FindBugsWarning fbw = new FindBugsWarning(filePath, finalFileName, line, message, category, priority, ruleName, classification);

				// Add warning to the list of warnings.
				findBugsWarnings.add(fbw);
			}
		}
	}

}

@@ -1179,59 +1179,8 @@
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-%09%09%09%09if (file.getNodeType() == Node.ELEMENT_NODE) %7B%0A
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@@ -1560,14 +1560,8 @@
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@@ -2165,61 +2165,8 @@
 );%0A%0A
-%09%09%09if (warning.getNodeType() == Node.ELEMENT_NODE) %7B%0A
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@@ -3596,21 +3596,16 @@
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remove high cyclomatic complexity problem in FindBugsXMLParser