/*
 * Copyright 2006 Sascha Weinreuter
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package test;

import org.intellij.lang.regexp.RegExpFileType;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;
import org.jdom.xpath.XPath;

import java.io.*;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

public class MainParseTest extends BaseParseTestcase {

  private ByteArrayOutputStream myOut;

  enum Result {
    OK, ERR
  }

  static class Test {
    String pattern;
    boolean showWarnings = true;
    boolean showInfo = false;
    Result expectedResult;

    Test(String pattern, Result result, boolean warn, boolean info) {
      this.pattern = pattern;
      expectedResult = result;
      showWarnings = warn;
      showInfo = info;
    }
  }

  private final Map<String, Test> myMap = new LinkedHashMap<String, Test>();

  @Override
  protected void setUp() throws Exception {
    final Document document = new SAXBuilder().build(new File(getTestDataRoot(), "/RETest.xml"));
    final List<Element> list = XPath.selectNodes(document.getRootElement(), "//test");

    int i = 0;
    for (Element element : list) {
      final String name;
      final Element parent = (Element)element.getParent();
      final String s = parent.getName();
      final String t = parent.getAttribute("id") == null ? "" : parent.getAttribute("id").getValue() + "-";
      if (!"tests".equals(s)) {
        name = s + "/test-" + t + ++i + ".regexp";
      }
      else {
        name = "test-" + t + ++i + ".regexp";
      }
      final Result result = Result.valueOf((String)XPath.selectSingleNode(element, "string(expected)"));
      final boolean warn = !"false".equals(element.getAttributeValue("warning"));
      final boolean info = "true".equals(element.getAttributeValue("info"));

      final String pattern = (String)XPath.selectSingleNode(element, "string(pattern)");
      myMap.put(name, new Test(pattern, result, warn, info));
      if (!"false".equals(element.getAttributeValue("verify"))) {
        try {
          Pattern.compile(pattern);
          if (result == Result.ERR) {
            System.out.println("Incorrect FAIL value for " + pattern);
          }
        }
        catch (PatternSyntaxException e) {
          if (result == Result.OK) {
            System.out.println("Incorrect OK value for " + pattern);
          }
        }
      }
    }

    super.setUp();

    myOut = new ByteArrayOutputStream();
    System.setErr(new PrintStream(myOut));
  }

  @Override
  protected String getTestDataPath() {
    return super.getTestDataPath() + "/gen/";
  }

  public void testSimple() throws Exception {
    doTest("simple/");
  }

  public void testQuantifiers() throws Exception {
    doTest("quantifiers/");
  }

  public void testGroups() throws Exception {
    doTest("groups/");
  }

  public void testCharclasses() throws Exception {
    doTest("charclasses/");
  }

  public void testEscapes() throws Exception {
    doTest("escapes/");
  }

  public void testAnchors() throws Exception {
    doTest("anchors/");
  }

  public void testNamedchars() throws Exception {
    doTest("namedchars/");
  }

  public void testBackrefs() throws Exception {
    doTest("backrefs/");
  }

  public void testComplex() throws Exception {
    doTest("complex/");
  }

  public void testIncomplete() throws Exception {
    doTest("incomplete/");
  }

  public void testRealLife() throws Exception {
    doTest("real-life/");
  }

  public void testRegressions() throws Exception {
    doTest("regressions/");
  }

  public void testBugs() throws Exception {
    doTest("bug/");
  }

  public void testFromXML() throws Exception {
    doTest(null);
  }

  private void doTest(String prefix) throws IOException {
    int n = 0;
    int failed = 0;
    for (String name : myMap.keySet()) {
      if (prefix == null && name.contains("/")) {
        continue;
      }
      if (prefix != null && !name.startsWith(prefix)) {
        continue;
      }
      System.out.print("filename = " + name);
      n++;

      final MainParseTest.Test test = myMap.get(name);
      try {
        myFixture.configureByText(RegExpFileType.INSTANCE, test.pattern);
        myFixture.testHighlighting(test.showWarnings, true, test.showInfo);

        if (test.expectedResult == Result.ERR) {
          System.out.println("  FAILED. Expression incorrectly parsed OK: " + test.pattern);
          failed++;
        }
        else {
          System.out.println("  OK");
        }
      }
      catch (Throwable e) {
        if (test.expectedResult == Result.ERR) {
          System.out.println("  OK");
        }
        else {
          e.printStackTrace();
          System.out.println("  FAILED. Expression = " + test.pattern);
          if (myOut.size() > 0) {
            String line;
            final BufferedReader reader = new BufferedReader(new StringReader(myOut.toString()));
            do {
              line = reader.readLine();
            }
            while (line != null && (line.trim().length() == 0 || line.trim().equals("ERROR:")));
            if (line != null) {
              if (line.matches(".*java.lang.Error: junit.framework.AssertionFailedError:.*")) {
                System.out.println("ERROR: " + line.replace("java.lang.Error: junit.framework.AssertionFailedError:", ""));
              }
            }
            else {
              System.out.println("ERROR: " + myOut.toString());
            }
          }
          failed++;
        }
      }
      myOut.reset();
    }

    System.out.println("");
    System.out.println(n + " Tests executed, " + failed + " failed");

    assertFalse(failed > 0);
  }
}