/*!
 * VisualEditor ContentEditable TextNode class.
 *
 * @copyright 2011-2013 VisualEditor Team and others; see AUTHORS.txt
 * @license The MIT License (MIT); see LICENSE.txt
 */

/**
 * ContentEditable text node.
 *
 * @class
 * @extends ve.ce.LeafNode
 * @constructor
 * @param {ve.dm.TextNode} model Model to observe
 * @param {Object} [config] Config options
 */
ve.ce.TextNode = function VeCeTextNode( model, config ) {
	// Parent constructor
	ve.ce.LeafNode.call( this, model, config );
};

/* Inheritance */

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

/* Static Properties */

ve.ce.TextNode.static.name = 'text';

ve.ce.TextNode.static.canBeSplit = true;

ve.ce.TextNode.whitespaceHtmlCharacters = {
	'\n': '\u21b5', // ↵ / ↵
	'\t': '\u279e' // ➞ / ➞
};

/* Methods */

/**
 * Get an HTML rendering of the text.
 *
 * @method
 * @returns {Array} Array of rendered HTML fragments with annotations
 */
ve.ce.TextNode.prototype.getAnnotatedHtml = function () {
	var i, chr, character, nextCharacter,
		data = this.model.getDocument().getDataFromNode( this.model ),
		whitespaceHtmlChars = ve.ce.TextNode.whitespaceHtmlCharacters,
		significantWhitespace = this.getModel().getParent().hasSignificantWhitespace();

	function setChar( chr, index, data ) {
		if ( ve.isArray( data[index] ) ) {
			// Don't modify the original array, clone it first
			data[index] = data[index].slice( 0 );
			data[index][0] = chr;
		} else {
			data[index] = chr;
		}
	}

	if ( !significantWhitespace ) {
		// Replace spaces with   where needed
		if ( data.length > 0 ) {
			// Leading space
			character = data[0];
			if ( ve.isArray( character ) ? character[0] === ' ' : character === ' ' ) {
				// \u00a0 ==   ==  
				setChar( '\u00a0', 0, data );
			}
		}
		if ( data.length > 1 ) {
			// Trailing space
			character = data[data.length - 1];
			if ( ve.isArray( character ) ? character[0] === ' ' : character === ' ' ) {
				setChar( '\u00a0', data.length - 1, data );
			}
		}
	}

	for ( i = 0; i < data.length; i++ ) {
		chr = typeof data[i] === 'string' ? data[i] : data[i][0];

		if ( chr === ' ' && !significantWhitespace && data.length > 2 && i !== 0 && i !== data.length - 1 ) {
			// Replace any sequence of 2+ spaces with an alternating pattern
			// (space-nbsp-space-nbsp-...)
			nextCharacter = typeof data[i + 1] === 'string' ? data[i + 1] : data[i + 1][0];
			if ( nextCharacter === ' ' ) {
				setChar( '\u00a0', i + 1, data );
			}
		}
		if ( !significantWhitespace && chr in whitespaceHtmlChars ) {
			setChar( whitespaceHtmlChars[chr], i, data );
		}
	}
	return data;
};

/* Registration */

ve.ce.nodeFactory.register( ve.ce.TextNode );