/*
 * Copyright 2007 Trent Richardson
 */
jQuery.extend({    
    ImpromptuDefaults: { prefix:'jqi', buttons:{ Ok:true }, loaded:function(){}, submit:function(){return true;}, callback:function(){}, container:'body', opacity:0.6, overlayspeed:'slow', promptspeed:'fast', show:'show'},
    SetImpromptuDefaults: function(o){ 
        jQuery.ImpromptuDefaults = jQuery.extend({},jQuery.ImpromptuDefaults,o);
    },
    prompt: function(m,o){
        o = jQuery.extend({},jQuery.ImpromptuDefaults,o);
        
        var ie6 = (jQuery.browser.msie && jQuery.browser.version < 7);    
        var b = (ie6)? jQuery(document.body):jQuery(o.container);    
        var fade = '<div class="'+ o.prefix +'fade" id="'+ o.prefix +'fade"></div>';
        if((jQuery.browser.msie && jQuery('object, applet').length > 0) || ie6)
            fade = '<iframe src="" class="'+ o.prefix +'fade" id="'+ o.prefix +'fade"></iframe>';
        var msgbox = '<div class="'+ o.prefix +'" id="'+ o.prefix +'"><div class="'+ o.prefix +'container"><div class="'+ o.prefix +'message">'+ m +'</div><div class="'+ o.prefix +'buttons" id="'+ o.prefix +'buttons">';
        jQuery.each(o.buttons,function(k,v){ msgbox += '<button name="'+ o.prefix +'button'+ k +'" id="'+ o.prefix +'button'+ k +'" value="'+ v +'">'+ k +'</button>'}) ;
        msgbox += '</div></div></div>';
        
        var jqi = b.prepend(msgbox).children('#'+ o.prefix);
        var jqif = b.prepend(fade).children('#'+ o.prefix +'fade');
        
        //ie6 calculation functions
        var getfoffset = function(){ return (document.documentElement.scrollTop || document.body.scrollTop) + 'px'; };
        var getjoffset = function(){ return (document.documentElement.scrollTop || document.body.scrollTop) + Math.round(15 * (document.documentElement.offsetHeight || document.body.clientHeight) / 100) + 'px'; };
        var ie6scroll = function(){ jqif.css({ top: getfoffset() }); jqi.css({ top: getjoffset() }); };
        
        jqif.css({ position: "absolute", height: (ie6)? "100%":b.height(), width: "100%", top: (ie6)? getfoffset():0, left: 0, right: 0, bottom: 0, zIndex: 998, display: "none", opacity: o.opacity });
        jqi.css({ position: (ie6)? "absolute" : "fixed", top: (ie6)? getjoffset():"30%", left: "50%", display: "none", zIndex: 999, marginLeft: ((((jqi.css("paddingLeft").split("px")[0]*1) + jqi.width())/2)*-1) });
            
        jQuery('#'+ o.prefix +'buttons').children('button').click(function(){ 
            var msg = jqi.children('.'+ o.prefix +'container').children('.'+ o.prefix +'message');
            var clicked = o.buttons[jQuery(this).text()];    
            if(o.submit(clicked,msg)){        
                jqi.remove(); 
                if(ie6)jQuery(window).unbind('scroll',ie6scroll);//ie6, remove the scroll event
                jqif.fadeOut(o.overlayspeed,function(){
                    jqif.remove();
                    o.callback(clicked,msg);
                });
            }
        });
                
        if(ie6) jQuery(window).scroll(ie6scroll);//ie6, add a scroll event to fix position:fixed
        jqif.fadeIn(o.overlayspeed);
        jqi[o.show](o.promptspeed,o.loaded);
        return jqi;
    }    
});