/**
 * ContentEditable node for text.
 * 
 * @class
 * @constructor
 * @extends {ve.ce.LeafNode}
 * @param model {ve.dm.TextNode} Model to observe
 */
ve.ce.TextNode = function( model ) {
	// Inheritance
	ve.ce.LeafNode.call( this, model, $( '<span></span>' ) );
};

/* Static Members */

/**
 * @see ve.ce.NodeFactory
 */
ve.ce.TextNode.rules = {
	'canHaveChildren': false,
	'canHaveGrandchildren': false,
	'canBeSplit': true
};

/**
 * List of annotation rendering implementations.
 * 
 * Each supported annotation renderer must have an open and close property, each either a string or
 * a function which accepts a data argument.
 * 
 * @static
 * @member
 */
ve.ce.TextNode.annotationRenderers = {
	'object/template': {
		'open': function( data ) {
			return '<span class="ve-ce-content-format-object">' + data.html;
		},
		'close': '</span>'
	},
	'object/hook': {
		'open': function( data ) {
			return '<span class="ve-ce-content-format-object">' + data.html;
		},
		'close': '</span>'
	},
	'textStyle/bold': {
		'open': '<b>',
		'close': '</b>'
	},
	'textStyle/italic': {
		'open': '<i>',
		'close': '</i>'
	},
	'textStyle/strong': {
		'open': '<span class="ve-ce-content-format-textStyle-strong">',
		'close': '</span>'
	},
	'textStyle/emphasize': {
		'open': '<span class="ve-ce-content-format-textStyle-emphasize">',
		'close': '</span>'
	},
	'textStyle/big': {
		'open': '<span class="ve-ce-content-format-textStyle-big">',
		'close': '</span>'
	},
	'textStyle/small': {
		'open': '<span class="ve-ce-content-format-textStyle-small">',
		'close': '</span>'
	},
	'textStyle/superScript': {
		'open': '<span class="ve-ce-content-format-textStyle-superScript">',
		'close': '</span>'
	},
	'textStyle/subScript': {
		'open': '<span class="ve-ce-content-format-textStyle-subScript">',
		'close': '</span>'
	},
	'link/external': {
		'open': function( data ) {
			return '<span class="ve-ce-content-format-link" data-href="' + data.href + '">';
		},
		'close': '</span>'
	},
	'link/internal': {
		'open': function( data ) {
			return '<span class="ve-ce-content-format-link" data-title="wiki/' + data.title + '">';
		},
		'close': '</span>'
	}
};

/**
 * Mapping of character and HTML entities or renderings.
 * 
 * @static
 * @member
 */
ve.ce.TextNode.htmlCharacters = {
	'&': '&amp;',
	'<': '&lt;',
	'>': '&gt;',
	'\'': '&#039;',
	'"': '&quot;',
	'\n': '<span class="ve-ce-content-whitespace">&#182;</span>',
	'\t': '<span class="ve-ce-content-whitespace">&#8702;</span>'
};

/* Static Methods */

/**
 * Gets a rendered opening or closing of an annotation.
 * 
 * Tag nesting is handled using a stack, which keeps track of what is currently open. A common stack
 * argument should be used while rendering content.
 * 
 * @static
 * @method
 * @param {String} bias Which side of the annotation to render, either "open" or "close"
 * @param {Object} annotation Annotation to render
 * @param {Array} stack List of currently open annotations
 * @returns {String} Rendered annotation
 */
ve.ce.TextNode.renderAnnotation = function( bias, annotation, stack ) {
	var renderers = ve.ce.TextNode.annotationRenderers,
		type = annotation.type,
		out = '';
	if ( type in renderers ) {
		if ( bias === 'open' ) {
			// Add annotation to the top of the stack
			stack.push( annotation );
			// Open annotation
			out += typeof renderers[type].open === 'function' ?
				renderers[type].open( annotation.data ) : renderers[type].open;
		} else {
			if ( stack[stack.length - 1] === annotation ) {
				// Remove annotation from top of the stack
				stack.pop();
				// Close annotation
				out += typeof renderers[type].close === 'function' ?
					renderers[type].close( annotation.data ) : renderers[type].close;
			} else {
				// Find the annotation in the stack
				var depth = ve.inArray( annotation, stack ),
					i;
				if ( depth === -1 ) {
					throw 'Invalid stack error. An element is missing from the stack.';
				}
				// Close each already opened annotation
				for ( i = stack.length - 1; i >= depth + 1; i-- ) {
					out += typeof renderers[stack[i].type].close === 'function' ?
						renderers[stack[i].type].close( stack[i].data ) :
							renderers[stack[i].type].close;
				}
				// Close the buried annotation
				out += typeof renderers[type].close === 'function' ?
					renderers[type].close( annotation.data ) : renderers[type].close;
				// Re-open each previously opened annotation
				for ( i = depth + 1; i < stack.length; i++ ) {
					out += typeof renderers[stack[i].type].open === 'function' ?
						renderers[stack[i].type].open( stack[i].data ) :
							renderers[stack[i].type].open;
				}
				// Remove the annotation from the middle of the stack
				stack.splice( depth, 1 );
			}
		}
	}
	return out;
};

/* Methods */

/**
 * Gets the outer length, which for a text node is the same as the inner length.
 * 
 * @method
 * @returns {Integer} Length of the entire node
 */
ve.ce.TextNode.prototype.getOuterLength = function() {
	return this.length;
};

/**
 * Render content.
 * 
 * @method
 */
ve.ce.LeafNode.prototype.render = function() {
	this.$.html( this.getHtml() );
};

/**
 * Gets an HTML rendering of a range of data within content model.
 * 
 * @method
 * @param {ve.Range} range Range of content to render
 * @param {String} Rendered HTML of data within content model
 */
ve.ce.TextNode.prototype.getHtml = function( range ) {
	if ( range ) {
		range.normalize();
	} else {
		range = { 'start': 0, 'end': undefined };
	}
	var data = this.doc.getDataFromNode( this ),
		render = ve.ce.TextNode.renderAnnotation,
		htmlChars = ve.ce.TextNode.htmlCharacters;
	var out = '',
		left = '',
		right,
		leftPlain,
		rightPlain,
		stack = [],
		chr,
		i,
		j;
	for ( i = 0; i < data.length; i++ ) {
		right = data[i];
		leftPlain = typeof left === 'string';
		rightPlain = typeof right === 'string';
		if ( !leftPlain && rightPlain ) {
			// [formatted][plain] pair, close any annotations for left
			for ( j = 1; j < left.length; j++ ) {
				out += render( 'close', left[j], stack );
			}
		} else if ( leftPlain && !rightPlain ) {
			// [plain][formatted] pair, open any annotations for right
			for ( j = 1; j < right.length; j++ ) {
				out += render( 'open', right[j], stack );
			}
		} else if ( !leftPlain && !rightPlain ) {
			// [formatted][formatted] pair, open/close any differences
			for ( j = 1; j < left.length; j++ ) {
				if ( ve.inArray( left[j], right ) === -1 ) {
					out += render( 'close', left[j], stack );
				}
			}
			for ( j = 1; j < right.length; j++ ) {
				if ( ve.inArray( right[j], left ) === -1 ) {
					out += render( 'open', right[j], stack );
				}
			}
		}
		chr = rightPlain ? right : right[0];
		out += chr in htmlChars ? htmlChars[chr] : chr;
		left = right;
	}
	// Close all remaining tags at the end of the content
	if ( !rightPlain && right ) {
		for ( j = 1; j < right.length; j++ ) {
			out += render( 'close', right[j], stack );
		}
	}
	return out;
};

/* Registration */

ve.ce.factory.register( 'text', ve.ce.TextNode );

/* Inheritance */

ve.extendClass( ve.ce.TextNode, ve.ce.LeafNode );