NcodeImageResizer.IMAGE_ID_BASE = 'ncode_imageresizer_container_';
NcodeImageResizer.WARNING_ID_BASE = 'ncode_imageresizer_warning_';
NcodeImageResizer.scheduledResizes = [];

function NcodeImageResizer(id, img) {
        this.id = id;
        this.img = img;
        this.originalWidth = 0;
        this.originalHeight = 0;
        this.warning = null;
        this.warningTextNode = null;
        this.originalWidth = img.originalWidth;
        this.originalHeight = img.originalHeight;

        img.id = NcodeImageResizer.IMAGE_ID_BASE+id;
}

NcodeImageResizer.executeOnload = function() {
        var rss = NcodeImageResizer.scheduledResizes;
        for(var i = 0; i  < rss.length; i++) {
                NcodeImageResizer.createOn(rss[i], true);
        }
}

NcodeImageResizer.schedule = function(img) {
        if(NcodeImageResizer.scheduledResizes.length == 0) {
                if(window.addEventListener) {
                        window.addEventListener('load', NcodeImageResizer.executeOnload, false);
                } else if(window.attachEvent) {
                        window.attachEvent('onload', NcodeImageResizer.executeOnload);
                }
        }
        NcodeImageResizer.scheduledResizes.push(img);
}

NcodeImageResizer.getNextId = function() {
        var id = 1;
        while(document.getElementById(NcodeImageResizer.IMAGE_ID_BASE+id) != null) {
                id++;
        }
        return id;
}

NcodeImageResizer.createOnId = function(id) {
        return NcodeImageResizer.createOn(document.getElementById(id));
}

NcodeImageResizer.createOn = function(img, isSchedule) {
        if(typeof isSchedule == 'undefined') isSchedule = false;

        if(!img || !img.tagName || img.tagName.toLowerCase() != 'img') {
                alert(img+' is not an image ('+img.tagName.toLowerCase()+')');
        }

        if(img.width == 0 || img.height == 0) {
                if(!isSchedule)
                        NcodeImageResizer.schedule(img);
                return;
        }

        if(!img.originalWidth) img.originalWidth = img.width;
        if(!img.originalHeight) img.originalHeight = img.height;

        if((NcodeImageResizer.MAXWIDTH > 0 && img.originalWidth > NcodeImageResizer.MAXWIDTH) || (NcodeImageResizer.MAXHEIGHT > 0 && img.originalHeight > NcodeImageResizer.MAXHEIGHT)) {
                var isRecovery = false; // if this is a recovery from QuickEdit, which only restores the HTML, not the OO structure
                var newid, resizer;
                if(img.id && img.id.indexOf(NcodeImageResizer.IMAGE_ID_BASE) == 0) {
                        newid = img.id.substr(NcodeImageResizer.IMAGE_ID_BASE.length);
                        if(document.getElementById(NcodeImageResizer.WARNING_ID_BASE+newid) != null) {
                                resizer = new NcodeImageResizer(newid, img);
                                isRecovery = true;
                                resizer.restoreImage();
                        }
                } else {
                        newid = NcodeImageResizer.getNextId();
                        resizer = new NcodeImageResizer(newid, img);
                }

                if(isRecovery) {
                        resizer.reclaimWarning(newid);
                } else {
                        resizer.createWarning();
                }
                resizer.scale();
        }
}

NcodeImageResizer.prototype.restoreImage = function() {
        newimg = document.createElement('IMG');
        newimg.src = this.img.src;
        this.img.width = newimg.width;
        this.img.height = newimg.height;
}

NcodeImageResizer.prototype.reclaimWarning = function(id) {
        this.warning = document.getElementById(NcodeImageResizer.WARNING_ID_BASE+id);
        this.warningTextNode = this.warning.firstChild.firstChild.childNodes[1].firstChild;
        this.warning.resize = this;

        this.scale();
}

NcodeImageResizer.prototype.createWarning = function() {
        var mtable = document.createElement('TABLE');
        var mtbody = document.createElement('TBODY');
        var mtr = document.createElement('TR');
        var mtd1 = document.createElement('TD');
        var mtd2 = document.createElement('TD');
        var mimg = document.createElement('IMG');
        var mtext = document.createTextNode('');

        mimg.src = NcodeImageResizer.BBURL+'/imageresizer/resize.gif';
        mimg.width = 16;
        mimg.height = 16;
        mimg.alt = '';
        mimg.border = 0;

        mtd1.width = 20;
        mtd1.className = 'td1';

        mtd2.unselectable = 'on';
        mtd2.className = 'td2';

        mtable.className = 'ncode_imageresizer_warning';
        mtable.textNode = mtext;
        mtable.resize = this;
        mtable.id = NcodeImageResizer.WARNING_ID_BASE+this.id;

        mtd1.appendChild(mimg);
        mtd2.appendChild(mtext);

        mtr.appendChild(mtd1);
        mtr.appendChild(mtd2);

        mtbody.appendChild(mtr);

        mtable.appendChild(mtbody);

        this.img.parentNode.insertBefore(mtable, this.img);

        this.warning = mtable;
        this.warningTextNode = mtext;
}

NcodeImageResizer.prototype.setText = function(text) {
        var newnode = document.createTextNode(text);
        this.warningTextNode.parentNode.replaceChild(newnode, this.warningTextNode);
        this.warningTextNode = newnode;
}

NcodeImageResizer.prototype.scale = function() {
        this.img.height = this.originalHeight;
        this.img.width = this.originalWidth;

        if(NcodeImageResizer.MAXWIDTH > 0 && this.img.width > NcodeImageResizer.MAXWIDTH) {
                this.img.height = (NcodeImageResizer.MAXWIDTH / this.img.width) * this.img.height;
                this.img.width = NcodeImageResizer.MAXWIDTH;
        }

        if(NcodeImageResizer.MAXHEIGHT > 0 && this.img.height > NcodeImageResizer.MAXHEIGHT) {
                this.img.width = (NcodeImageResizer.MAXHEIGHT / this.img.height) * this.img.width;
                this.img.height = NcodeImageResizer.MAXHEIGHT;
        }

        this.warning.width = this.img.width;
        this.warning.onclick = function() { return this.resize.unScale(); }

         if(this.img.width < 450) {
         this.setText(ncode_imageresizer_warning_small);
         } else if(this.img.fileSize && this.img.fileSize > 0) {
         this.setText(ncode_imageresizer_warning_filesize.replace('%1$s', this.originalWidth).replace('%2$s', this.originalHeight).replace('%3$s', Math.round(this.img.fileSize/1024)));
         } else {
         this.setText(ncode_imageresizer_warning_no_filesize.replace('%1$s', this.originalWidth).replace('%2$s', this.originalHeight));
         }

        return false;
}

NcodeImageResizer.prototype.unScale = function() {
        switch(NcodeImageResizer.MODE) {
                case 'samewindow':
                        window.open(this.img.src, '_self');
                        break;
                case 'newwindow':
                        window.open(this.img.src, '_blank');
                        break;
                case 'enlarge':
                default:
                        this.img.width = this.originalWidth;
                        this.img.height = this.originalHeight;
                        this.img.className = 'ncode_imageresizer_original';
                           if(this.warning != null) {
                           this.setText(ncode_imageresizer_warning_fullsize);
                           this.warning.width = this.img.width;
                           this.warning.onclick = function() { return this.resize.scale() };
                         }
                        break;
        }

        return false;
}