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var _=require('lodash');

function _findRoute(path,stack) {
    var count=0;
    var routes=[];
    stack.forEach(function(layer) {
        if (!layer) return;
        if (layer && !layer.match(path)) return;
        if (['query', 'expressInit'].indexOf(layer.name) != -1) return;
        if (layer.name == 'router') {
            routes=routes.concat(_findRoute(trimPrefix(path, layer.path),layer.handle.stack));
        } else {
            if (layer.name == 'bound dispatch') {
                routes.push({route: layer || null, stack: stack});
            }
        }
    });
    return routes;
}

function findRoute(app, path) {
    var  stack;
    stack = app._router.stack;
    return (_findRoute(path, stack));
}

function trimPrefix(path, prefix) {
    // This assumes prefix is already at the start of path.
    return path.substr(prefix.length);
}


module.exports = function removeRoute(app, path, method) {
    var found, route, stack, idx;

    found = findRoute(app, path);

    found.forEach(function(layer) {
        route = layer.route;
        stack = layer.stack;

        if (route) {
            if(_.isEmpty(method)){  // if no method delete all resource with the given path
                idx = stack.indexOf(route);
                stack.splice(idx, 1);
            }else if(JSON.stringify(route.route.methods).toUpperCase().indexOf(method.toUpperCase())>=0){  // if method defined delete only the resource with the given ath and method
                idx = stack.indexOf(route);
                stack.splice(idx, 1);
            }
        }
    });

    return true;
};

module.exports.findRoute = findRoute;