/*!
 * Express - router - Route
 * Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
 * MIT Licensed
 */

/**
 * Expose `Route`.
 */

module.exports = Route;

/**
 * Initialize `Route` with the given HTTP `method`, `path`,
 * and an array of `callbacks` and `options`.
 *
 * Options:
 *
 *   - `sensitive`    enable case-sensitive routes
 *   - `strict`       enable strict matching for trailing slashes
 *
 * @param {String} method
 * @param {String} path
 * @param {Array} callbacks
 * @param {Object} options.
 * @api private
 */

function Route( method, path, callbacks, options ) {
	options = options || {};
	this.path = path;
	this.method = method;
	this.callbacks = callbacks;
	this.regexp = normalize( path
		, this.keys = []
		, options.sensitive
		, options.strict );
}

/**
 * Check if this route matches `path` and return captures made.
 *
 * @param {String} path
 * @return {Array}
 * @api private
 */

Route.prototype.match = function ( path ) {
	return this.regexp.exec( path );
};

/**
 * Normalize the given path string,
 * returning a regular expression.
 *
 * An empty array should be passed,
 * which will contain the placeholder
 * key names. For example "/user/:id" will
 * then contain ["id"].
 *
 * @param  {String|RegExp} path
 * @param  {Array} keys
 * @param  {Boolean} sensitive
 * @param  {Boolean} strict
 * @return {RegExp}
 * @api private
 */

function normalize( path, keys, sensitive, strict ) {
	if ( path instanceof RegExp ) {
		return path;
	}
	path = path
		.concat( strict ? '' : '/?' )
		.replace( /\/\(/g, '(?:/' )
		.replace( /(\/)?(\.)?:(\w+)(?:(\(.*?\)))?(\?)?/g, function ( _, slash, format, key, capture, optional ) {
			keys.push( { name : key, optional : !!optional } );
			slash = slash || '';
			return ''
				       + (optional ? '' : slash)
				       + '(?:'
				       + (optional ? slash : '')
				       + (format || '') + (capture || (format && '([^/.]+?)' || '([^/]+?)')) + ')'
				+ (optional || '');
		} )
		.replace( /([\/.])/g, '\\$1' )
		.replace( /\*/g, '(.*)' );
	return new RegExp( '^' + path + '$', sensitive ? '' : 'i' );
}