/* jshint globalstrict:true, strict:true, maxlen: 5000 */
/* global describe, before, after, it, require, beforeEach */

// //////////////////////////////////////////////////////////////////////////////
// / @brief tests for user access rights
// /
// / @file
// /
// / DISCLAIMER
// /
// / Copyright 2017 ArangoDB GmbH, Cologne, Germany
// /
// / Licensed under the Apache License, Version 2.0 (the "License");
// / you may not use this file except in compliance with the License.
// / You may obtain a copy of the License at
// /
// /     http://www.apache.org/licenses/LICENSE-2.0
// /
// / Unless required by applicable law or agreed to in writing, software
// / distributed under the License is distributed on an "AS IS" BASIS,
// / WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// / See the License for the specific language governing permissions and
// / limitations under the License.
// /
// / Copyright holder is ArangoDB GmbH, Cologne, Germany
// /
// / @author Michael Hackstein
// / @author Mark Vollmary
// / @author Copyright 2017, ArangoDB GmbH, Cologne, Germany
// //////////////////////////////////////////////////////////////////////////////

'use strict';

const expect = require('chai').expect;
const tasks = require('@arangodb/tasks');
const pu = require('@arangodb/process-utils');
const users = require('@arangodb/users');
const internal = require('internal');
const download = internal.download;
const keySpaceId = 'task_update_user_keyspace';
const taskId = "task_update_user_periodic";
const arango = internal.arango;
const db = internal.db;
const taskPeriod = 0.3;

const createKeySpace = (keySpaceId) => {
  return executeJS(`return global.KEYSPACE_CREATE('${keySpaceId}', 128, true);`).body === 'true';
};

const dropKeySpace = (keySpaceId) => {
  executeJS(`global.KEYSPACE_DROP('${keySpaceId}');`);
};

const setKey = (keySpaceId, key) => {
  return executeJS(`global.KEY_SET('${keySpaceId}', '${key}', 0);`);
};

const getKey = (keySpaceId, key) => {
  let res = executeJS(`return global.KEY_GET('${keySpaceId}', '${key}');`).body;
  let num = Number(res);
  if (isNaN(num)) {
    console.error("KEY_GET response: " + res);
    return 0;
  }
  return num;
};

const executeJS = (code) => {
  let httpOptions = pu.makeAuthorizationHeaders({
    username: 'root',
    password: ''
  });
  httpOptions.method = 'POST';
  httpOptions.timeout = 1800;
  httpOptions.returnBodyOnError = true;
  return download(arango.getEndpoint().replace('tcp', 'http') + '/_admin/execute?returnAsJSON=true',
    code,
    httpOptions);
};

const switchUser = (user) => {
  arango.reconnect(arango.getEndpoint(), '_system', user, '');
};

const waitForTaskStart = () => {
  let i = 50;
  while (--i > 0) {
    internal.wait(0.1);
    if (getKey(keySpaceId, "bob") !== 0) {
      break;
    }
  }
  expect(i).to.be.above(0,  "Task must have run at least once");
};

const waitForTaskStop = () => {
  let i = 50;
  let last = 0;
  while (--i > 0) {
    internal.wait(taskPeriod);
    let current = getKey(keySpaceId, "bob");
    expect(current).to.not.be.equal(0,  "Received invalid key");
    if (current === last) {
      break;
    }
    last = current;
    internal.wait(taskPeriod);
  }
  expect(i).to.be.above(0,  "The repeatable task was able run with insufficient rights");
};

describe('User Rights Management', () => {
  before(() => {
    users.save("bob");
    users.grantDatabase("bob", "_system", "rw");
    users.grantCollection("bob", "_system", "*", "rw");

    switchUser("bob");
    expect(createKeySpace(keySpaceId)).to.equal(true, 'keySpace creation failed!');
  });
  after(() => {
    switchUser("root", "_system");
    users.remove("bob");
    dropKeySpace(keySpaceId);
    try {
      internal.print("Unregistering task");
      tasks.unregister(taskId);
    } catch (e) {}
  });

  it('test cancelling periodic tasks', () => {
      switchUser("bob");
      setKey(keySpaceId, "bob");

      tasks.register({
        id: taskId,
        name: taskId,
        period: taskPeriod,
        command: `(function (params) {
          global.KEY_SET('${keySpaceId}', "bob", require('internal').time());
        })(params);`
      });

      internal.print("Started task, now waiting...");
      waitForTaskStart();

      switchUser("root", "_system");
      internal.print("Downgrading rights");

      // should cause the task to stop eventually
      users.grantDatabase("bob", '_system', 'ro');
      internal.print("Waiting for task to stop");
      waitForTaskStop();
  });
});