// 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.List;

import org.chromium.sdk.Script;

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

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

import org.chromium.sdk.internal.protocolparser.JsonProtocolParseException;

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

/**

 * An objects that holds data for a "script" which is a part of a resource

 * loaded into the browser, identified by its original document URL, line offset

 * in the original document, and the line count this script spans.

 */

public class ScriptImpl implements Script {

  /**

   * An object containing data that uniquely identify a V8 script chunk.

   */

  public static class Descriptor {

    public final Type type;

    public final String name;

    public final int lineOffset;

    public final int endLine;

    public final long id;

    public Descriptor(Type type, long id, String name, int lineOffset, int lineCount) {

      this.type = type;

      this.id = id;

      this.name = name;

      this.lineOffset = lineOffset;

      this.endLine = lineOffset + lineCount - 1;

    }

    @Override

    public int hashCode() {

      return

          name != null ? name.hashCode() : (int) id * 0x101 +

          lineOffset * 0x1001 +

          endLine * 0x10001;

    }

    @Override

    public boolean equals(Object obj) {

      if (obj == this) {

        return true;

      }

      if (!(obj instanceof Descriptor)) {

        return false;

      }

      Descriptor that = (Descriptor) obj;

      // The id equality is stronger than the name equality.

      return this.id == that.id &&

          this.lineOffset == that.lineOffset &&

          this.endLine == that.endLine;

    }

    public static Descriptor forResponse(ScriptHandle script, List<SomeHandle> refs,

        V8ContextFilter contextFilter) {

      script = V8ProtocolUtil.validScript(script, refs, contextFilter);

      if (script == null) {

        return null;

      }

      String name = script.name();

      try {

        Long scriptType = script.scriptType();

        Type type = V8ProtocolUtil.getScriptType(scriptType);

        if (type == null) {

          return null;

        }

        int lineOffset = (int) script.lineOffset();

        int lineCount = (int) script.lineCount();

        int id = V8ProtocolUtil.getScriptIdFromResponse(script).intValue();

        return new Descriptor(type, id, name, lineOffset, lineCount);

      } catch (Exception e) {

        // not a script object has been passed in

        return null;

      }

    }

  }

  private final Descriptor descriptor;

  private String source;

  /**

   * @param descriptor of the script retrieved from a "scripts" response

   */

  public ScriptImpl(Descriptor descriptor) {

    this.descriptor = descriptor;

    this.source = null;

  }

  public Type getType() {

    return this.descriptor.type;

  }

  public String getName() {

    return descriptor.name;

  }

  public int getStartLine() {

    return descriptor.lineOffset;

  }

  public int getEndLine() {

    return descriptor.endLine;

  }

  public long getId() {

    return descriptor.id;

  }

  public String getSource() {

    return source;

  }

  public boolean hasSource() {

    return source != null;

  }

  public void setSource(String source) {

    this.source = source;

  }

  @Override

  public int hashCode() {

    return

        descriptor.hashCode() * 0x101 +

        (hasSource() ? (source.hashCode() * 0x1001) : 0);

  }

  @Override

  public boolean equals(Object obj) {

    if (this == obj) {

      return true;

    }

    if (!(obj instanceof ScriptImpl)) {

      return false;

    }

    ScriptImpl that = (ScriptImpl) obj;

    return this.descriptor.equals(that.descriptor) && eq(this.source, that.source);

  }

  private static boolean eq(Object left, Object right) {

    return left == right || (left != null && left.equals(right));

  }

  @Override

  public String toString() {

    StringBuilder sb = new StringBuilder();

    sb.append("[Script (").append(hasSource()

        ? "has"

        : "no").append(" source): name=").append(getName()).append(", lineRange=[").append(

        getStartLine()).append(';').append(getEndLine()).append("]]");

    return sb.toString();

  }

  public static Long getScriptId(HandleManager handleManager, long scriptRef) {

    SomeHandle handle = handleManager.getHandle(scriptRef);

    if (handle == null) {

      return -1L; // not found

    }

    ScriptHandle scriptHandle;

    try {

      scriptHandle = handle.asScriptHandle();

    } catch (JsonProtocolParseException e) {

      throw new RuntimeException(e);

    }

    return scriptHandle.id();

  }

}