/*
Copyright (c) 2009, www.redips.net  All rights reserved.
Code licensed under the BSD License: http://www.redips.net/license/

http://www.redips.net/javascript/dialog-box/
version 1.2.2
Feb 4, 2010.
*/

/*jslint white: true, browser: true, undef: true, nomen: true, eqeqeq: true, plusplus: false, bitwise: true, regexp: true, strict: true, newcap: true, immed: true, maxerr: 14 */
/*global window: false */

/* enable strict mode */
"use strict";

// create REDIPS namespace
var REDIPS = {};

REDIPS.dialog = (function () {
		// function declaration
	var	init,
		showhtml,
		hide,
		position,
		visibility,
		fade,
		
		// private parameters
		shade,				// shade div (object reference)
		dialog_box,			// dialog box (object reference)
		dialog_width = 0,	// initialize dialog width
		dialog_height = 0,	// initialize dialog height
		op_high = 60,		// highest opacity level
		op_low = 0,			// lowest opacity level (should be the same as initial opacity in the CSS)
		fade_speed = 18,	// set default speed - 18ms 
		function_call;		// name of function to call after clicking on button 


	// initialization
	init = function () {
		// create dialog box
		dialog_box = document.createElement('div');
		dialog_box.setAttribute('id', 'dialog');
		// create shade div
		shade = document.createElement('div');
		shade.setAttribute('id', 'shade');
		// append dialog box and shade to the page body
		var body = document.getElementsByTagName('body')[0];
		body.appendChild(shade);
		body.appendChild(dialog_box);
		// define onscroll & onresize event handler for FF, Chrome		
		if (window.addEventListener) {
			window.addEventListener('scroll', position, false);
			window.addEventListener('resize', position, false);
		}
		// IE
		else if (window.attachEvent) {
			window.attachEvent('onscroll', position);
			window.attachEvent('onresize', position);
		}
		// other (hopefully this will not be needed)
		else {
			window.onscroll = position;
			window.onresize = position;
		}
	};
	
	showhtml = function (width, height, html) {
		// set dialog width, height and calculate central position
		dialog_width  = width;
		dialog_height = height;
		position();
		dialog_box.innerHTML = html;
		// show shade and dialog box
		shade.style.display = dialog_box.style.display = 'block';
		// hide dropdown menus, iframes & flash
		//visibility('hidden');
		// show shaded div slowly
		fade(op_low, 10);
	};
	
	// hide dialog box and shade
	hide = function (fnc) {
		// set function call
		function_call = fnc;
		// start fade out
		fade(op_high, -20);
		// hide dialog box
		dialog_box.style.display = 'none';
		// show dropdown menu, iframe & flash
		//visibility('visible');
		
	};

	// function sets dialog position to the center and maximize shade div
	position = function () {
		// define local variables
		var window_width, window_height, scrollX, scrollY;
		// Non-IE (Netscape compliant)
		if (typeof(window.innerWidth) === 'number') {
			window_width  = window.innerWidth;
			window_height = window.innerHeight;
			scrollX = window.pageXOffset;
			scrollY = window.pageYOffset;
		}
		// IE 6 standards compliant mode
		else if (document.documentElement && (document.documentElement.clientWidth || document.documentElement.clientHeight)) {
			window_width  = document.documentElement.clientWidth;
			window_height = document.documentElement.clientHeight;
			scrollX = document.documentElement.scrollLeft;
			scrollY = document.documentElement.scrollTop;
			// IE hack because #shade{width:100%;height:100%;} will not work for IE if body{height:100%} isn't set also ?!
			shade.style.width   = window_width  + 'px';
			shade.style.height  = window_height + 'px';
		}
		// DOM compliant
		else if (document.body && (document.body.clientWidth || document.body.clientHeight)) {
			window_width  = document.body.clientWidth;
			window_height = document.body.clientHeight;
			scrollX = document.body.scrollLeft;
			scrollY = document.body.scrollTop;
		}
		// place dialog box to the center
		dialog_box.style.left = (scrollX + ((window_width  - dialog_width)  / 2)) + 'px';
		dialog_box.style.top  = (scrollY + ((window_height - dialog_height) / 2)) + 'px';
		// set shade offset
		shade.style.top  = scrollY + 'px';
		shade.style.left = scrollX + 'px';
	};
	
	
	// show/hide dropdown menu, iframe and flash objects (work-around for dropdown menu problem in IE6)
	visibility = function (p) {
		var obj = [],	// define tag array
			x, y;		// variables used in local loops
		obj[0] = document.getElementsByTagName('select');
		obj[1] = document.getElementsByTagName('iframe');
		obj[2] = document.getElementsByTagName('object');
		// loop through fetched elements
		for (x = 0; x < obj.length; x++) {
			for (y = 0; y < obj[x].length; y++) {
				obj[x][y].style.visibility = p;
			}
		}
	};
	
	
	// shade fade in / fade out
	fade = function (opacity, step) {
		// set opacity for FF and IE
		shade.style.opacity = opacity / 100;
		shade.style.filter  = 'alpha(opacity=' + opacity + ')';
		// update opacity level
		opacity += step;
		// recursive call if opacity is between 'low' and 'high' values
		if (op_low <= opacity && opacity <= op_high) {
			setTimeout(
				function () {
					fade(opacity, step);
				}, fade_speed); // fade speed is public parameter
		}
		// hide shade div when fade out ends and make function call 
		else if (op_low > opacity) {
			shade.style.display = 'none';
			if (function_call !== 'undefined') {
				// call function after button is clicked because functions are defined in global scope
				window[function_call]();
			}
		}
	};
	
	return {
		// public properties
		op_high			: op_high,		// highest opacity level
		op_low			: op_low,		// lowest opacity level (should be the same as initial opacity in the CSS)
		fade_speed		: fade_speed,	// fade speed (default is 18ms)
        
		// public methods
		init			: init,			// initialization
		showhtml			: showhtml,			// show dialog box
		hide			: hide			// hide dialog box
	};
			
}());