export const walk = function(routes) {
  const keys = Object.keys(routes);
  keys.forEach((item, i) => {
    if (item === '_options') {
      return;
    }
    const options = routes[item]._options;
    let cb;
    if (Object.keys(routes[item]).length > 1) {
      cb = function() {
        walk.apply(this, [routes[item]]);
      };
    }
    this.route(item, options, cb);
  });
  if (typeof routes.index === 'undefined') {
    routes.index = {
      _options: {
        path: '',
      },
    };
  }
};

/**
 * Drop in for the Router.map callback e.g. `Router.map(walk(routes))`
 * Uses { walk } to recursively walk through a JSON object of routes
 * and use `Router.route` to define your routes for your ember application
 *
 * @param {object} routes - JSON representation of routes
 */
export default function(routes) {
  return function() {
    walk.apply(this, [routes]);
  };
}

// The following code is purposefully commented out to prevent it from ending up
// in the production codebase. In future it would be good to figure out how to do this
// without having to use comments.

// const indent = function(num) {
//   return Array(num).fill('  ', 0, num).join('')
// }
// /**
//  * String dumper to produce Router.map code
//  * Uses { walk } to recursively walk through a JSON object of routes
//  * to produce the code necessary to define your routes for your ember application
//  *
//  * @param {object} routes - JSON representation of routes
//  * @example `console.log(dump(routes));`
//  */
// export const dump = function(routes) {
//   let level = 2;
//   const obj = {
//     out: '',
//     route: function(name, options, cb) {
//       this.out += `${indent(level)}this.route('${name}', ${JSON.stringify(options)}`;
//       if(cb) {
//         level ++;
//         this.out += `, function() {
// `;
//         cb.apply(this, []);
//         level --;
//         this.out += `${indent(level)}});
// `;
//       } else {
//         this.out += ');';
//       }
//       this.out += `
// `;
//     }
//   };
//   walk.apply(obj, [routes])
//   return `Router.map(
//   function() {
// ${obj.out}
//   }
// );`;
// }
