// Copyright (c) 2009 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

package org.chromium.sdk.internal;

import java.util.Collection;

import java.util.Collections;

import java.util.HashMap;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import org.chromium.sdk.Script;

import org.chromium.sdk.internal.ScriptImpl.Descriptor;

import org.chromium.sdk.internal.protocol.data.ScriptHandle;

import org.chromium.sdk.internal.protocol.data.SomeHandle;

import org.chromium.sdk.internal.tools.v8.V8ProtocolUtil;

/**

 * Manages scripts known in the corresponding browser tab.

 */

public class ScriptManager {

  public interface Callback {

    /**

     * This method gets invoked for every script in the manager.

     *

     * @param script to process

     * @return whether other scripts should be processed. If false, the #forEach

     *         method terminates.

     */

    boolean process(Script script);

  }

  /**

   * Maps script id's to scripts.

   */

  private final Map<Long, ScriptImpl> idToScript =

      Collections.synchronizedMap(new HashMap<Long, ScriptImpl>());

  private final V8ContextFilter contextFilter;

  private final DebugSession debugSession;

  ScriptManager(V8ContextFilter contextFilter, DebugSession debugSession) {

    this.contextFilter = contextFilter;

    this.debugSession = debugSession;

  }

  /**

   * Adds a script using a "script" V8 response.

   *

   * @param scriptBody to add the script from

   * @param refs that contain the associated script debug context

   * @return the new script, or {@code null} if the response does not contain

   *         a valid script JSON

   */

  public synchronized Script addScript(ScriptHandle scriptBody, List<SomeHandle> refs) {

    ScriptImpl theScript = findById(V8ProtocolUtil.getScriptIdFromResponse(scriptBody));

    if (theScript == null) {

      Descriptor desc = Descriptor.forResponse(scriptBody, refs, contextFilter);

      if (desc == null) {

        return null;

      }

      theScript = new ScriptImpl(desc, debugSession);

      idToScript.put(desc.id, theScript);

    }

    if (scriptBody.source() != null) {

      setSourceCode(scriptBody, theScript);

    }

    return theScript;

  }

  /**

   * Associates a source received in a "source" V8 response with the given

   * script.

   *

   * @param body the JSON response body

   * @param script the script to associate the source with

   */

  private void setSourceCode(ScriptHandle body, ScriptImpl script) {

    String src = body.source();

    if (src == null) {

      return;

    }

    if (script != null) {

      script.setSource(src);

    }

  }

  /**

   * @param id of the script to find

   * @return the script with {@code id == ref} or {@code null} if none found

   */

  public ScriptImpl findById(Long id) {

    return idToScript.get(id);

  }

  /**

   * Determines whether all scripts added into this manager have associated

   * sources.

   *

   * @return whether all known scripts have associated sources

   */

  public boolean isAllSourcesLoaded() {

    final boolean[] result = new boolean[1];

    result[0] = true;

    forEach(new Callback() {

      public boolean process(Script script) {

        if (!script.hasSource()) {

          result[0] = false;

          return false;

        }

        return true;

      }

    });

    return result[0];

  }

  public Collection<Script> allScripts() {

    final Collection<Script> result = new HashSet<Script>();

    forEach(new Callback() {

      public boolean process(Script script) {

        result.add(script);

        return true;

      }

    });

    return result;

  }

  /**

   * This method allows running the same code for all scripts in the manager. All modifications

   * are blocked for this period of time.

   * @param callback to invoke for every script, until

   *        {@link Callback#process(Script)} returns {@code false}.

   */

  public synchronized void forEach(Callback callback) {

    for (Script script : idToScript.values()) {

      if (!callback.process(script)) {

        return;

      }

    }

  }

  public void reset() {

    idToScript.clear();

  }

  public V8ContextFilter getContextFilter() {

    return contextFilter;

  }

}