/*
 * Copyright 2020 FUJITSU LIMITED
 *
 * 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.
 */

import session from './server/session';
import binding from './server/binding';
import healthCheck from './server/healthcheck';

export default (kibana) => {
  const COOKIE_PASSWORD_SIZE = 32;

  return new kibana.Plugin({
    require: ['elasticsearch'],
    config : config,
    init   : init
  });

  function config(Joi) {

    const cookie = Joi.object({
      name        : Joi.string()
        .default('keystone'),
      password    : Joi.string()
        .min(COOKIE_PASSWORD_SIZE)
        .default(require('crypto').randomBytes(COOKIE_PASSWORD_SIZE).toString('hex')),
      isSecure    : Joi.boolean()
        .default(process.env.NODE_ENV !== 'development'),
      ignoreErrors: Joi.boolean()
        .default(true),
      expiresIn   : Joi.number()
        .positive()
        .integer()
        .default(60 * 60 * 1000) // 1 hour
    }).default();

    const deprecatedKeystone = Joi.object({
      url : Joi.string().uri({scheme: ['http', 'https']}),
      port: Joi.number(),
    })
      .tags(['deprecated'])
      .notes(['url,port settings have been deprecated in favour of auth_uri'])
      .default();

    const validKeystone = Joi.object({
      auth_uri: Joi.string().uri({scheme: ['http', 'https']})
    })
      .default();

    //Elasticsearch parameter added due to the fact that retrieving elasticsearch url via server.config() is impossible
    const elasticsearch = Joi.object({
      url: Joi.string().uri({scheme: ['http', 'https']})
    }).default();

    return Joi
      .object({
        enabled: Joi.boolean().default(true),
        events: Joi.boolean().default(false),
        logs: Joi.boolean().default(true),
        defaultTimeField: Joi.string().default('@timestamp'),
        defaultEventsTimeField: Joi.string().default('@timestamp'),
        logsIndexPrefix: Joi.string().default('logs-<project_id>'),
        eventsIndexPrefix: Joi.string().default('events-<project_id>'),
        cookie: cookie,
        elasticsearch: elasticsearch
      })
      .concat(deprecatedKeystone)
      .concat(validKeystone)
      .and('url', 'port')
      .without('auth_uri', ['url', 'port'])
      .default();
  }

  async function init(server) {
    server.log(['MKP','status', 'debug', 'keystone'], 'Initializing keystone plugin');
    binding(server).start();
    await session(server).start();
    healthCheck(this, server).start();
    server.log(['MKP','status', 'debug', 'keystone'], 'Initialized keystone plugin');
  }
};