// FrameManager.js -- Must be added in Hosting window
var FrameManager =
{
    currentFrameId: '',
    currentFrameHeight: 0,
    lastFrameId: '',
    lastFrameHeight: 0,
    resizeTimerId: null,

    init: function() {
        if (FrameManager.resizeTimerId == null) {
            FrameManager.resizeTimerId = window.setInterval(FrameManager.resizeFrames, 500);
        }
    },

    resizeFrames: function() {
        FrameManager.retrieveFrameIdAndHeight();

        if ((FrameManager.currentFrameId != FrameManager.lastFrameId) ||
            (FrameManager.currentFrameHeight != FrameManager.lastFrameHeight)) {
            var iframe = document.getElementById(FrameManager.currentFrameId.toString());

            if (iframe == null) return;

            iframe.style.height = FrameManager.currentFrameHeight.toString() + "px";

            FrameManager.lastFrameId = FrameManager.currentFrameId;
            FrameManager.lastFrameHeight = FrameManager.currentFrameHeight;
            window.location.hash = '';
            
             try {
                var e = document.getElementById('hdnScroll');                
                if (e) {                    
                    var vScroll = e.value;                   
                    if (vScroll != '')
                        vScroll = parseInt(vScroll);
                    if (vScroll > 0)
                        vScroll += 100;
                    
                    window.scrollTo(0, vScroll);
                }
            }
            catch (Error) { }
        }
    },

    retrieveFrameIdAndHeight: function() {
        if (window.location.hash.length == 0) return;

        var hashValue = window.location.hash.substring(1);

        if ((hashValue == null) || (hashValue.length == 0)) return;

        var pairs = hashValue.split('&');

        if ((pairs != null) && (pairs.length > 0)) {
            for (var i = 0; i < pairs.length; i++) {
                var pair = pairs[i].split('=');

                if ((pair != null) && (pair.length > 0)) {
                    if (pair[0] == 'frameId') {
                        if ((pair[1] != null) && (pair[1].length > 0)) {
                            FrameManager.currentFrameId = pair[1];
                        }
                    }
                    else if (pair[0] == 'height') {
                        var height = parseInt(pair[1]);

                        if (!isNaN(height)) {
                            FrameManager.currentFrameHeight = height;
                            FrameManager.currentFrameHeight += 15;
                        }
                    }
                }
            }
        }
    },

    registerFrame: function(frame) {
        try {

            if (FrameManager.lastFrameHeight != "") {
                ht = FrameManager.lastFrameHeight;
                frame.style.height = ht.toString() + "px";
                return;
            }

            var currentLocation = location.href;
            var hashIndex = currentLocation.indexOf('#');

            if (hashIndex > -1) {
                currentLocation = currentLocation.substring(0, hashIndex);
            }

            frame.contentWindow.location = frame.src + '?frameId=' + frame.id + '#' + currentLocation;

        }
        catch (e) {
            alert('ex:' + e);
        }
    }
};

window.setTimeout(FrameManager.init, 300);