/*
 * Copyright 2009 Google Inc.
 *
 * 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 com.google.eclipse.javascript.jstestdriver.ui.launch;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author shyamseshadri@gmail.com (Shyam Seshadri)
 */
public class TestCaseNameFinder {
  // TODO(shyamseshadri): Handle the following case
  /*
   * TestCase('name', { testMooh: function() {
   * }, testMeuh: function() {} });
   * 
   */
  private static final Pattern TESTMETHOD_DECLARATION_PATTERN =
      Pattern.compile("\\s*([a-zA-Z_]*)\\.prototype(\\.test.*?)[\\s=].*");

  public List<String> getTestCases(File jsFile) throws IOException {
    return getTestCases(new FileInputStream(jsFile));
  }
  
  public List<String> getTestCases(InputStream jsStream) throws IOException {
    BufferedReader reader = new BufferedReader(new InputStreamReader(jsStream));
    String input = null;
    StringBuilder builder = new StringBuilder();
    while ((input = reader.readLine()) != null) {
      builder.append(input + "\n");
    }
    String source = builder.toString();
    return getTestCases(source);
  }

  public List<String> getTestCases(String source) {
    List<String> testMethods = new ArrayList<String>();
    for (String line : source.split("\n")) {
      Matcher matcher = TESTMETHOD_DECLARATION_PATTERN.matcher(line);
      if (matcher.matches()) {
        testMethods.add(matcher.group(1)+matcher.group(2));
      }
    }
    return testMethods;
  }
}