'use strict';

// process.stdout.isTTY
var form = require('terminal-forms.js').create(process.stdin, process.stdout);
//var dns = form.PromiseA.promisifyAll(require('dns'));
var OAUTH3 = require('../oauth3.node.js');
// TODO change to ._hooks
OAUTH3._hooks = require('../oauth3.node.storage.js');
// directives = { get, set }
// sessions = { get, set }
/*
OAUTH3._hooks.directives.get = require('../oauth3.node.storage.js').directives.get;
OAUTH3._hooks.directives.set = require('../oauth3.node.storage.js').directives.set;
OAUTH3._hooks.session.get = require('../oauth3.node.storage.js').sessions.get;
OAUTH3._hooks.session.set = require('../oauth3.node.storage.js').sessions.set;
*/

// opts = { email, providerUri }
module.exports.login = function (options) {
  options = options || {};
  var url = require('url');
  //console.log('stdin tty', process.stdin.isTTY);
  //console.log('stdout tty', process.stdout.isTTY);
  var oauth3;
  var opts = {
    email: options.email
  , providerUri: options.providerUri
  };
  if (opts.form) {
    form = opts.form;
  }
  var email;
  var providerUrl;
  var providerUri;
  var sameProvider;
  var username;

  function getSession() {
    var username;

    // TODO lookup uuid locally before performing loginMeta
    // TODO lookup token locally before performing loginMeta / otp
    return OAUTH3.authn.loginMeta(oauth3._providerDirectives, { email: email }).then(function (/*result*/) {
      return { node: email, type: 'email' };
    }, function (/*err*/) {
      // TODO require hashcash to create user account
      function confirmCreateAccount() {
        // TODO directives should specify private (invite-only) vs internal (request) vs public (allow) accounts
        return form.ask({
          label: "We don't recognize that address. Do you want to create a new account? [Y/n] "
        , type: 'text' // TODO boolean with default Y or N
        }).then(function (result) {
          if (!result.input) {
            result.input = 'Y';
          }

          // TODO needs backup address if email is on same domain as login
          result.input = result.input.toLowerCase();

          if ('y' !== result.input) {
            return getCurrentUserEmail();
          }

          if (!sameProvider) {
            return { node: email, type: 'email' };
          }

          return form.ask({
            label: "What's your recovery email (or cloud mail) address? ", type: 'email'
          }).then(function (recoveryResult) {
            return {
              node: email
            , type: 'name'
            , recovery: recoveryResult.result || recoveryResult.input
            };
          });
        });
      }

      return confirmCreateAccount();
    }).then(function (user) {
      // TODO skip if token exists locally
      var email = (user.recovery || user.node);
      form.println("Sending login code to '" + email + "'...");
      return OAUTH3.authn.otp(oauth3._providerDirectives, { email: email }).then(function (otpResult) {
        return form.ask({
          label: "What's your login code? "
        , help: "(it was sent to '" + email + "' and looks like 1234-5678-9012)"
          // onkeyup
          // ondebounce
          // onchange
          // regexp // html5 name?
        , onReturnAsync: function (rs, ws, input/*, ch*/) {
            var formatted = input.toLowerCase().replace(/[^\d]+/g, '');

            if (12 !== formatted.length) {
              return form.PromiseA.reject(new Error("invalid code please try again in the format xxxx-yyyy-zzzz"));
            }

            formatted = formatted.match(/.{4,4}/g).join('-');

            if (14 !== formatted.split('').length) {
              return form.PromiseA.reject(new Error("invalid code '" + formatted + "', please try again xxxx-yyyy-zzzz"));
            }

            var data = {
              username: email
            , username_type: 'email'
            , client_id: OAUTH3.uri.normalize(oauth3._providerDirectives.issuer)
            , client_uri: OAUTH3.uri.normalize(oauth3._providerDirectives.issuer)
            , otp_code: formatted
            , otp_uuid: otpResult.data.uuid
            };

            // returns session instead of input
            var colors = require('colors');
            form.setStatus(colors.dim("authenticating with server..."));
            return OAUTH3.authn.resourceOwnerPassword(oauth3._providerDirectives, data).then(function (result) {
              return result;
            }, function (/*err*/) {
              // TODO test error
              return form.PromiseA.reject(new Error("The code '" + formatted + "' is mistyped or incorrect. Double check and try again."));
            });
          }
        });
      });
    });
  }

  function getCurrentUserEmail() {
    return form.ask({
      label: "What's your email (or cloud mail) address? ", type: 'email', value: opts.email
    }).then(function (emailResult) {
      opts.email = undefined;
      email = (emailResult.result || emailResult.input);
      var emailParts = email.split('@');
      var domain = emailParts[1];
      username = emailParts[0];
      providerUrl = 'https://' + domain;
      providerUri = domain;

      var urlObj = url.parse(providerUrl);
      // TODO get unique client id for bootstrapping app
      oauth3 = OAUTH3.create(urlObj);
      return oauth3.setProvider(domain).then(function () {
        sameProvider = true;
        // ignore
      }, function () {
        function askOauth3Url() {
          return form.ask({
            label: "What's your OAuth3 Provider URL? ", type: 'url', value: opts.providerUri
          }).then(function (urlResult) {
            opts.providerUri = undefined;
            providerUrl = urlResult.result || urlResult.input;
            providerUri = OAUTH3.uri.normalize(providerUrl);

            var urlObj = url.parse(providerUrl);
            // TODO get unique client id for bootstrapping app
            oauth3 = OAUTH3.create(urlObj);
            return oauth3.setProvider(providerUri).then(function () {
              // ignore
            }, function (err) {
              form.println(err.stack || err.message || err.toString());
              return askOauth3Url();
            });
          });
        }

        return askOauth3Url();
      });
    });
  }

  return getCurrentUserEmail().then(function () {
    return OAUTH3._hooks.meta.get(email).then(function (id) {
      if (!id) {
        return null;
      }
      return OAUTH3._hooks.sessions.get(providerUri, id).then(function (session) {
        if (session) {
          return session;
        }
        return null;
      });
    });
  }).then(function (session) {
    if (session) {
      return session;
    }

    return getSession().then(function (sessionResult) {
      var session = sessionResult.result;
      var id = require('crypto').createHash('sha256').update(session.token.sub || '').digest('hex');

      return OAUTH3._hooks.sessions.set(providerUri, session, id).then(function (session) {
        return OAUTH3._hooks.meta.set(email, id).then(function () {
          return session;
        });
      });
    });
  }).then(function (session) {
    oauth3.__session = session;
    return oauth3;
  });
};