// Copyright (c) 2014 The Chromium Embedded Framework 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.cef.callback;

import java.io.OutputStream;
import java.util.Vector;

/**
 * Class used to represent drag data. The methods of this class may be called
 * on any thread.
 */
public abstract class CefDragData {
    /**
     * Supported drag operation bit flags.
     */
    public static final class DragOperations {
        public final static int DRAG_OPERATION_NONE = 0;
        public final static int DRAG_OPERATION_COPY = 1;
        public final static int DRAG_OPERATION_LINK = 2;
        public final static int DRAG_OPERATION_GENERIC = 4;
        public final static int DRAG_OPERATION_PRIVATE = 8;
        public final static int DRAG_OPERATION_MOVE = 16;
        public final static int DRAG_OPERATION_DELETE = 32;
        public final static int DRAG_OPERATION_EVERY = Integer.MAX_VALUE;
    }

    // This CTOR can't be called directly. Call method create() instead.
    CefDragData() {}

    @Override
    protected void finalize() throws Throwable {
        dispose();
        super.finalize();
    }

    /**
     * Create a new CefDragData object.
     */
    public static final CefDragData create() {
        return CefDragData_N.createNative();
    }

    /**
     * Returns a copy of the current object
     */
    public abstract CefDragData clone();

    /**
     * Removes the native reference from an unused object.
     */
    public abstract void dispose();

    /**
     * Test if the object is set to read-only.
     * @return true if this object is read-only.
     */
    public abstract boolean isReadOnly();

    /**
     * Returns true if the drag data is a link.
     */
    public abstract boolean isLink();

    /**
     * Returns true if the drag data is a text or html fragment.
     */
    public abstract boolean isFragment();

    /**
     * Returns true if the drag data is a file.
     */
    public abstract boolean isFile();

    /**
     * Return the link URL that is being dragged.
     */
    public abstract String getLinkURL();

    /**
     * Return the title associated with the link being dragged.
     */
    public abstract String getLinkTitle();

    /**
     * Return the metadata, if any, associated with the link being dragged.
     */
    public abstract String getLinkMetadata();

    /**
     * Return the plain text fragment that is being dragged.
     */
    public abstract String getFragmentText();

    /**
     * Return the text/html fragment that is being dragged.
     */
    public abstract String getFragmentHtml();

    /**
     * Return the base URL that the fragment came from. This value is used for
     * resolving relative URLs and may be empty.
     */
    public abstract String getFragmentBaseURL();

    /**
     * Write the contents of the file being dragged out of the web view into
     * |writer|. Returns the number of bytes sent to |writer|. If |writer| is
     * NULL this method will return the size of the file contents in bytes.
     * Call getFileName() to get a suggested name for the file.
     *
     * @param writer Writes the contents into this object.
     * @return The number of bytes sent to writer. If writer is NULL the size of
     *   the file contents in bytes is returned.
     */
    public abstract int getFileContents(OutputStream writer);

    /**
     * Return the name of the file being dragged out of the browser window.
     */
    public abstract String getFileName();

    /**
     * Retrieve the list of file names that are being dragged into the browser
     * window.
     */
    public abstract boolean getFileNames(Vector<String> names);

    /**
     * Set the link URL that is being dragged.
     * @param url The link URL to be set.
     */
    public abstract void setLinkURL(String url);

    /**
     * Set the title associated with the link being dragged.
     * @param title The tile associated with the link.
     */
    public abstract void setLinkTitle(String title);

    /**
     * Set the metadata associated with the link being dragged.
     * @param data The metadata associated with the link.
     */
    public abstract void setLinkMetadata(String data);

    /**
     * Set the plain text fragment that is being dragged.
     * @param text The plain text fragment to be set.
     */
    public abstract void setFragmentText(String text);

    /**
     * Set the text/html fragment that is being dragged.
     * @param html The html fragment to be set.
     */
    public abstract void setFragmentHtml(String html);

    /**
     * Set the base URL that the fragment came from.
     * @param baseUrl The base URL to be set.
     */
    public abstract void setFragmentBaseURL(String baseUrl);

    /**
     * Reset the file contents. You should do this before calling
     * CefBrowser.dragTargetDragEnter as the web view does not allow us to
     * drag in this kind of data.
     */
    public abstract void resetFileContents();

    /**
     * Add a file that is being dragged into the webview.
     * @param path The file and path to be set.
     * @param displayName The name to be displayed.
     */
    public abstract void addFile(String path, String displayName);

    @Override
    public String toString() {
        return "CefDragData [isReadOnly()=" + isReadOnly() + ", isLink()=" + isLink()
                + ", isFragment()=" + isFragment() + ", isFile()=" + isFile() + ", getLinkURL()="
                + getLinkURL() + ", getLinkTitle()=" + getLinkTitle() + ", getLinkMetadata()="
                + getLinkMetadata() + ", getFragmentText()=" + getFragmentText()
                + ", getFragmentHtml()=" + getFragmentHtml() + ", getFragmentBaseURL()="
                + getFragmentBaseURL() + ", getFileName()=" + getFileName() + "]";
    }
}