app = function () {
	var	_this = this,
		$document = $( document );

	this.$editor = $('#editor');

	this.$editor.bind( {
		'focus': function( e ) {
			$document.unbind( '.surfaceView' );
			$document.bind( {
				'keydown.surfaceView': function( e ) {
					return _this.onKeyDown( e );
				},
				'keyup.surfaceView': function( e ) {
					return _this.onKeyUp( e );
				},
				'keypress.surfaceView': function( e ) {
					return _this.onKeyPress( e );
				}
			} );
		},
		'blur': function( e ) {
			$document.unbind( '.surfaceView' );
		}
	} );

	this.$editor.mousedown( function(e) {
		return _this.onMouseDown( e );
	} );

	// Set initial content for the "editor"
	this.$editor.html("<b>Lorem Ipsum is simply dummy text</b> of the printing and typesetting industry. <b>Lorem Ipsum has been the <i>industry's</i> standard</b> dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it <u>to <b>make <i>a type</i> specimen</b> book.</u>");
	this.$editor.addClass('leafNode');

	this.lastKeydown = null;
	this.keydown = false;
	this.keyup = false;
	this.keypress = false;
	this.mousedown = false;
	this.diff = false;
	this.prevText = app.getDOMText(this.$editor[0]);
	this.prevOffset = null;
	this.loop = false;
	
	this.logkey = false;
};

app.prototype.onKeyDown = function( e ) {
	if(this.logkey) console.log("onKeyDown", e.which);
	this.keydown = true;
	this.lastKeydown = e.which;
};

app.prototype.onKeyUp = function( e ) {
	if(this.logkey) console.log("onKeyUp", e.which);
	this.keyup = true;
};

app.prototype.onKeyPress = function( e ) {
	if(this.logkey) console.log("onKeyPress");
	this.keypress = true;
};

app.prototype.onMouseDown = function( e ) {
	if(this.logkey) console.log("onMouseDown");
	this.mousedown = true;

	if(this.loop == false) {
		var _this = this;
		setInterval(function() {
			_this.loopFunc();
		}, 100);		
	}
};

app.prototype.loopFunc = function() {
	var text = app.getDOMText(this.$editor[0]).replace(String.fromCharCode(32), " ").replace(String.fromCharCode(160), " ");
	var selection = rangy.getSelection();
	if ( !selection.anchorNode ) {
		console.log("och");
		return;
	}
	var offset = this.getOffset(selection.anchorNode, selection.anchorOffset);

	if(text != this.prevText) {
		var textDiffLength = text.length - this.prevText.length;
		var offsetDiff = offset - this.prevOffset;
		var sameFromLeft = 0;
		var l = text.length;
		while ( sameFromLeft < l && this.prevText[sameFromLeft] == text[sameFromLeft] ) {
			++sameFromLeft;
		}
		

		if(false) {
			console.log("change start", sameFromLeft, offset);		
			console.log("different content", textDiffLength);
			console.log("different offset", offsetDiff);
		}

		if ( sameFromLeft != offset - textDiffLength ) {
			console.log('spell');
		}



		
		/*
		else if(textDiffLength === -1 && offsetDiff === -1 && offset === sameFromLeft ) {
			console.log("IME.1");
		} else if(textDiffLength === 0 && offsetDiff === 0 && offset-1 === sameFromLeft ) {
			console.log("IME.2");
		} else if ( textDiffLength < 0 || ( offset - textDiffLength ) !== sameFromLeft ) {
			console.log("SPELLCHECK");
		} else {
			console.log("!");
		}
		*/
		
		
		
		if ( textDiffLength !== offsetDiff ) {
			//console.log("!!!!#####!!!!!");
		}

		if(!this.keydown) {
			//console.log("## not keyboard");
		} else {
			//console.log("@@ keyboard");
		}



/*
		if((this.keydown || this.keyup) && this.lastKeydown !== 229) {
			console.log("");
		} else {
			console.log("Do NOT re-render");
		}
*/
		this.prevText = text;
		this.diff = true;
	} else {
		this.diff = false;
	}
	
	this.prevOffset = offset;
	this.keypress = false;
	this.keyup = false;
	this.keydown = false;
	this.mousedown = false;
};

app.getDOMText = function( elem ) {
    var nodeType = elem.nodeType,
        ret = '';

    if ( nodeType === 1 || nodeType === 9 ) {
        // Use textContent || innerText for elements
        if ( typeof elem.textContent === 'string' ) {
            return elem.textContent;
        } else if ( typeof elem.innerText === 'string' ) {
            // Replace IE's carriage returns
            return elem.innerText.replace( /\r\n/g, '' );
        } else {
            // Traverse it's children
            for ( elem = elem.firstChild; elem; elem = elem.nextSibling) {
                ret += app.getDOMText( elem );
            }
        }
    } else if ( nodeType === 3 || nodeType === 4 ) {
        return elem.nodeValue;
    }

    return ret;
};

app.prototype.getOffset = function( localNode, localOffset ) {
	var $node = $( localNode );

	if ( $node.hasClass( 'leafNode' ) ) {
		return localOffset;
	}
	
	while( !$node.hasClass( 'leafNode' ) ) {
		$node = $node.parent();
	}
	
	var current = [$node.contents(), 0];
	var stack = [current];
	
	var offset = 0;
	
	while ( stack.length > 0 ) {
		if ( current[1] >= current[0].length ) {
			stack.pop();
			current = stack[ stack.length - 1 ];
			continue;
		}
		var item = current[0][current[1]];
		var $item = current[0].eq( current[1] );
		
		if ( item.nodeType === 3 ) {
			if ( item === localNode ) {
				offset += localOffset;
				break;
			} else {
				offset += item.textContent.length;
			}
		} else if ( item.nodeType === 1 ) {
			if ( $( item ).attr('contentEditable') === "false" ) {
				offset += 1;
			} else {
				if ( item === localNode ) {
					offset += localOffset;
					break;
				}
			
				stack.push( [$item.contents(), 0] );
				current[1]++;
				current = stack[stack.length-1];
				continue;
			}
		}
		current[1]++;
	}

	return offset;
};

$(function() {
	new app();
});