/**
 * @license
 * Visual Blocks Editor
 *
 * Copyright 2012 Google Inc.
 * https://developers.google.com/blockly/
 *
 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
 *
 * 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.
 */

/**
 * @fileoverview Text input field.
 * @author fraser@google.com (Neil Fraser)
 */
'use strict';

goog.provide('Blockly.FieldScript');

goog.require('Blockly.Field');
goog.require('Blockly.Msg');
goog.require('goog.asserts');
goog.require('goog.dom');
goog.require('goog.userAgent');


/**
 * Class for an editable text field.
 * @param {string} text The initial content of the field.
 * @param {Function=} opt_validator An optional function that is called
 *     to validate any constraints on what the user entered.  Takes the new
 *     text as an argument and returns either the accepted text, a replacement
 *     text, or null to abort the change.
 * @extends {Blockly.Field}
 * @constructor
 */
Blockly.FieldScript = function(text) {
    Blockly.FieldScript.superClass_.constructor.call(this, text);
};
goog.inherits(Blockly.FieldScript, Blockly.Field);

/**
 * Point size of text.  Should match blocklyText's font-size in CSS.
 */
Blockly.FieldScript.FONTSIZE = 11;

/**
 * Mouse cursor style when over the hotspot that initiates the editor.
 */
Blockly.FieldScript.prototype.CURSOR = 'pointer';

/**
 * Allow browser to spellcheck this field.
 * @private
 */
Blockly.FieldScript.prototype.spellcheck_ = false;

/**
 * Close the input widget if this input is being deleted.
 */
Blockly.FieldScript.prototype.dispose = function() {
    Blockly.WidgetDiv.hideIfOwner(this);
    Blockly.FieldScript.superClass_.dispose.call(this);
};

/**
 * Set the text in this field.
 * @param {?string} text New text.
 * @override
 */
Blockly.FieldScript.prototype.setValue = function (text) {
    if (text === null) {
        return;  // No change if null.
    }
    
    Blockly.Field.prototype.setValue.call(this, text);
};

/**
 * Show the inline free-text editor on top of the text.
 * @param {boolean=} opt_quietInput True if editor should be created without
 *     focus.  Defaults to false.
 * @private
 */
Blockly.FieldScript.prototype.showEditor_ = function(opt_quietInput) {
    this.workspace_ = this.sourceBlock_.workspace;
    var that   = this;
    var base64 = that.getValue();
    var args = null;
    var isReturn = false;
    if (this.sourceBlock_ && this.sourceBlock_.arguments_) {
        args = this.sourceBlock_.arguments_;
    }
    if (this.sourceBlock_.getProcedureDef) {
        var options = this.sourceBlock_.getProcedureDef();
        isReturn = options[2];
    }

    scripts.showScriptDialog(atob(base64 || ''), args, isReturn, function (newScript) {
        if (newScript !== undefined && newScript !== null) that.setValue(btoa(newScript));
    });
};

/**
 * Draws the border with the correct width.
 * Saves the computed width in a property.
 * @private
 */
Blockly.FieldScript.prototype.render_ = function() {
    var width = 10;
    if (this.visible_) {
        if (this.borderRect_) {
            this.borderRect_.setAttribute('width', width + Blockly.BlockSvg.SEP_SPACE_X);
        }
    } else {
        width = 0;
    }
    this.size_.width = width;
};

/**
 * Update the text node of this field to display the current text.
 * @private
 */
Blockly.FieldScript.prototype.updateTextNode_ = function() {
    if (!this.textElement_) {
        // Not rendered yet.
        return;
    }
    // Empty the text element.
    goog.dom.removeChildren(/** @type {!Element} */ (this.textElement_));

    var textNode = document.createTextNode('...');
    this.textElement_.appendChild(textNode);

    // Cached width is obsolete.  Clear it.
    this.size_.width = 10;
};

/**
 * Close the editor, save the results, and dispose of the editable
 * text field's elements.
 * @return {!Function} Closure to call on destruction of the WidgetDiv.
 * @private
 */
/*Blockly.FieldScript.prototype.widgetDispose_ = function() {
    var thisField = this;
    return function() {
        var htmlInput = Blockly.FieldScript.htmlInput_;

        // Save the edit (if it validates).
        var text = htmlInput.value;
        thisField.setValue(text);
        thisField.sourceBlock_.rendered && thisField.sourceBlock_.render();
        Blockly.unbindEvent_(htmlInput.onKeyDownWrapper_);
        Blockly.unbindEvent_(htmlInput.onKeyUpWrapper_);
        Blockly.unbindEvent_(htmlInput.onKeyPressWrapper_);

        thisField.workspace_.removeChangeListener(
            htmlInput.onWorkspaceChangeWrapper_);

        Blockly.FieldScript.htmlInput_ = null;

        // Delete style properties.
        var style = Blockly.WidgetDiv.DIV.style;
        style.width = 'auto';
        style.height = 'auto';
        style.fontSize = '';
    };
};*/