/*
 * Copyright (c) 2013, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
 * 
 * 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.github.sdbg.debug.ui.internal.chromeconn;

import com.github.sdbg.debug.core.SDBGDebugCorePlugin;
import com.github.sdbg.debug.core.SDBGLaunchConfigWrapper;
import com.github.sdbg.debug.ui.internal.DartUtil;
import com.github.sdbg.debug.ui.internal.util.AbstractLaunchShortcut;
import com.github.sdbg.debug.ui.internal.util.ILaunchShortcutExt;
import com.github.sdbg.debug.ui.internal.util.LaunchUtils;
import com.github.sdbg.utilities.Streams;

import java.io.IOException;
import java.io.InputStreamReader;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.OperationCanceledException;
import org.eclipse.debug.core.DebugPlugin;
import org.eclipse.debug.core.ILaunchConfiguration;
import org.eclipse.debug.core.ILaunchConfigurationType;
import org.eclipse.debug.core.ILaunchConfigurationWorkingCopy;
import org.eclipse.debug.core.ILaunchManager;
import org.json.JSONException;
import org.json.JSONObject;

/**
 * A launch shortcut to connect to a running Chrome.
 */
public class ChromeConnLaunchShortcut extends AbstractLaunchShortcut implements ILaunchShortcutExt {
  public ChromeConnLaunchShortcut() {
    super("Connect to a running Chrome");
  }

  @Override
  public boolean canLaunch(IResource resource) {
//&&&    
//    if (!DartSdkManager.getManager().hasSdk()
//        || !DartSdkManager.getManager().getSdk().isDartiumInstalled()) {
//      return false;
//    }
//
//    // If it's contained by a folder which itself contains a manifest.json file, we can launch it.
//    if (resource instanceof IContainer) {
//      return containsManifestJsonFile((IContainer) resource);
//    } else {
//      return containsManifestJsonFile(resource.getParent());
//    }
    return false;
  }

  @Override
  protected ILaunchConfigurationType getConfigurationType() {
    ILaunchManager manager = DebugPlugin.getDefault().getLaunchManager();
    ILaunchConfigurationType type = manager.getLaunchConfigurationType(SDBGDebugCorePlugin.CHROMECONN_LAUNCH_CONFIG_ID);

    return type;
  }

  @Override
  protected IResource getLaunchableResource(Object originalResource) {
//&&&    
//    if (!(originalResource instanceof IResource)) {
//      return null;
//    }
//
//    IResource resource = (IResource) originalResource;
//
//    if (resource instanceof IContainer) {
//      return findManifestJsonFile((IContainer) resource);
//    } else {
//      return findManifestJsonFile(resource.getParent());
//    }
    return null;
  }

  @Override
  protected void launch(IResource resource, String mode) {
    if (resource == null) {
      return;
    }

    // Launch an existing configuration if one exists
    ILaunchConfiguration config;

    try {
      config = findConfig(resource);
    } catch (OperationCanceledException ex) {
      return;
    }

    if (config == null) {
      // Create and launch a new configuration
      ILaunchManager manager = DebugPlugin.getDefault().getLaunchManager();
      ILaunchConfigurationType type = manager.getLaunchConfigurationType(SDBGDebugCorePlugin.CHROMECONN_LAUNCH_CONFIG_ID);

      try {
        ILaunchConfigurationWorkingCopy launchConfig = type.newInstance(
            null,
            manager.generateLaunchConfigurationName(getLaunchName(resource)));

        SDBGLaunchConfigWrapper launchWrapper = new SDBGLaunchConfigWrapper(launchConfig);

        launchWrapper.setApplicationName(resource.getFullPath().toString());
        launchWrapper.setProjectName(resource.getProject().getName());
        launchConfig.setMappedResources(new IResource[] {resource});

        config = launchConfig.doSave();
      } catch (CoreException e) {
        DartUtil.logError(e);
        return;
      }
    }

    LaunchUtils.clearConsoles();

    SDBGLaunchConfigWrapper launchWrapper = new SDBGLaunchConfigWrapper(config);
    launchWrapper.markAsLaunched();
    LaunchUtils.launch(config, mode);
  }

  @Override
  protected boolean testSimilar(IResource resource, ILaunchConfiguration config) {
//&&&    
//    SDBGLaunchConfigWrapper wrapper = new SDBGLaunchConfigWrapper(config);
//
//    IResource configResource = wrapper.getApplicationResource();
//
//    if (configResource == null || !isManifestFile(configResource)) {
//      return false;
//    }
//
//    IResource launchAbleResource = getLaunchableResource(resource);
//
//    return configResource.equals(launchAbleResource);
    return false;
  }

  /**
   * Given a manifest.json resource (http://developer.chrome.com/extensions/manifest.html), extract
   * the "name" field.
   * 
   * @param jsonResource
   * @return
   */
  private String getLaunchName(IResource jsonResource) {
    String name = parseNameFromJson(jsonResource);
    return name == null ? jsonResource.getName() : name;
  }

  /**
   * Do a best effort to extract the "name" field out of a manifest.json file. On any failure,
   * return null.
   */
  private String parseNameFromJson(IResource resource) {
    if (!(resource instanceof IFile)) {
      return null;
    }

    try {
      IFile file = (IFile) resource;
      String text = Streams.loadAndClose(new InputStreamReader(file.getContents(), "UTF-8"));
      JSONObject obj = new JSONObject(text);
      return obj.optString("name", null);
    } catch (IOException ioe) {

    } catch (CoreException e) {

    } catch (JSONException e) {

    }

    return null;
  }
}