/* ***** BEGIN LICENSE BLOCK *****
 * Distributed under the BSD license:
 *
 * Copyright (c) 2010, Ajax.org B.V.
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of Ajax.org B.V. nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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define(function(require, exports, module) {
"use strict";

var event = require("../lib/event");

var DragdropHandler = function(mouseHandler) {
    var editor = mouseHandler.editor;
    var dragSelectionMarker, x, y;
    var timerId, range, isBackwards;
    var dragCursor, counter = 0;

    var mouseTarget = editor.container;
    event.addListener(mouseTarget, "dragenter", function(e) {
        counter++;
        if (!dragSelectionMarker) {
            range = editor.getSelectionRange();
            isBackwards = editor.selection.isBackwards();
            var style = editor.getSelectionStyle();
            dragSelectionMarker = editor.session.addMarker(range, "ace_selection", style);
            editor.clearSelection();
            clearInterval(timerId);
            timerId = setInterval(onDragInterval, 20);
        }
        return event.preventDefault(e);
    });

    event.addListener(mouseTarget, "dragover", function(e) {
        x = e.clientX;
        y = e.clientY;
        return event.preventDefault(e);
    });
    
    var onDragInterval =  function() {
        dragCursor = editor.renderer.screenToTextCoordinates(x, y);
        editor.moveCursorToPosition(dragCursor);
        editor.renderer.scrollCursorIntoView();
    };
    
    event.addListener(mouseTarget, "dragleave", function(e) {
        counter--;
        if (counter > 0)
            return;
        console.log(e.type, counter,e.target);
        clearInterval(timerId);
        editor.session.removeMarker(dragSelectionMarker);
        dragSelectionMarker = null;
        editor.selection.setSelectionRange(range, isBackwards);
        return event.preventDefault(e);
    });
    
    event.addListener(mouseTarget, "drop", function(e) {
        console.log(e.type, counter,e.target);
        counter = 0;
        clearInterval(timerId);
        editor.session.removeMarker(dragSelectionMarker);
        dragSelectionMarker = null;

        range.end = editor.session.insert(dragCursor, e.dataTransfer.getData('Text'));
        range.start = dragCursor;
        editor.focus();
        editor.selection.setSelectionRange(range);
        return event.preventDefault(e);
    });

};

exports.DragdropHandler = DragdropHandler;
});