'use strict';

//var OAUTH3 = require('./oauth3.core.js').OAUTH3;
var OAUTH3 = require('./oauth3.issuer.js').OAUTH3;
// used for OAUTH3.urls.resourcePasswordOwner
// used for OAUTH3.authn.loginMeta
// used for OAUTH3.authn.otp
// used for OAUTH3.authn.resourcePasswordOwner
var PromiseA = require('bluebird');
var requestAsync = PromiseA.promisify(require('request'));
var crypto = require('crypto');

OAUTH3.PromiseA = PromiseA;
OAUTH3._discoverHelper = function(providerUri, opts) {
  return OAUTH3._node.discover(providerUri, opts);
};
OAUTH3._requestHelper = function (preq, opts) {
  /*
  if (opts && opts.directives) {
    preq.url = OAUTH3.url.resolve(opts.directives.issuer, preq.url);
  }
  */
  return OAUTH3._node.request(preq, opts);
};
OAUTH3._base64.atob = function (base64) {
  return new Buffer(base64, 'base64').toString('utf8');
};
OAUTH3._base64.btoa = function (text) {
  return new Buffer(text, 'utf8').toString('base64');
};
OAUTH3._defaultStorage = require('./oauth3.node.storage');

OAUTH3._node = {};
OAUTH3._node.discover = function(providerUri/*, opts*/) {
  return OAUTH3.request({
    method: 'GET'
  , url: OAUTH3.url.normalize(providerUri) + '/.well-known/oauth3/directives.json'
  }).then(function (resp) {
    return resp.data;
  });
};
OAUTH3._node.request = function(preq/*, _sys*/) {
  var data = {
    method: preq.method
  , url: preq.url || preq.uri
  , headers: preq.headers
  , timeout: preq.timeout || undefined
  , json: preq.data || preq.body || preq.json || undefined // TODO which to use?
  , formData: preq.formData || undefined
  };

  //console.log('DEBUG request');
  //console.log(preq.url || preq.uri);
  //console.log(data.json);

  return requestAsync(data).then(OAUTH3._node._parseJson);
};
OAUTH3._node._parseJson = function (resp) {
  var err;
  var json = resp.body;

  // TODO toCamelCase
  if (!(resp.statusCode >= 200 && resp.statusCode < 400)) {
    err = new Error("bad response code: " + resp.statusCode);
  }

  //console.log('resp.body', typeof resp.body);
  if ('string' === typeof json) {
    try {
      json = JSON.parse(json);
    } catch(e) {
      err = err || (new Error('response not parsable: ' + resp.body));
    }
  }

  // handle both Oauth2- and node-style errors
  if (json && json.error) {
    err = new Error(json.error.message || json.error_description || JSON.stringify(json.error));
  }

  if (err) {
    err.result = json;
    return PromiseA.reject(err);
  }

  return {
    headers: resp.headers
  , status: resp.statusCode
  , data: json
  };
};
OAUTH3._logoutHelper = function(/*directives, opts*/) {
  // TODO allow prompting of which account
  return OAUTH3.PromiseA.reject(new Error("logout not yet implemented for node.js"));
};
OAUTH3._node.randomState = function () {
  return crypto.randomBytes(16).toString('hex');
};
OAUTH3.randomState = OAUTH3._node.randomState;

module.exports = OAUTH3;