/* eslint-disable @typescript-eslint/no-explicit-any,unicorn/no-null */
/*
 * Copyright (C) 2020 StApps
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
import {Client, Diagnostic} from '@elastic/elasticsearch';
import Indices from '@elastic/elasticsearch/lib/api/api/indices.js';
import {CreateResponse, SearchHit, SearchResponse} from '@elastic/elasticsearch/lib/api/types.js';
import {
  SCBook,
  SCBulkResponse,
  SCConfigFile,
  SCMessage,
  SCSearchQuery,
  SCThings,
  SCThingType,
} from '@openstapps/core';
import {Logger, SMTP} from '@openstapps/logger';
import {expect, use} from 'chai';
import chaiAsPromised from 'chai-as-promised';
import {beforeEach} from 'mocha';
import mockedEnv from 'mocked-env';
import sinon, {SinonStub} from 'sinon';
import {removeInvalidAliasChars} from '../../../src/storage/elasticsearch/util/alias.js';
import {MailQueue} from '../../../src/notification/mail-queue.js';
import {aggregations} from '../../../src/storage/elasticsearch/templating.js';
import {Elasticsearch} from '../../../src/storage/elasticsearch/elasticsearch.js';
import {bulk, DEFAULT_TEST_TIMEOUT, getTransport, getIndex} from '../../common.js';
import fs from 'fs';
import {backendConfig} from '../../../src/config.js';
import {readFile} from 'fs/promises';
import {
  ACTIVE_INDICES_ALIAS,
  getIndexUID,
  getThingIndexName,
  INACTIVE_INDICES_ALIAS,
  INDEX_UID_LENGTH,
  parseIndexName,
} from '../../../src/storage/elasticsearch/util/index.js';
import cron from 'node-cron';
import {query} from './query.js';

use(chaiAsPromised);

/**
 *
 */
function searchResponse<T>(...hits: SearchHit<T>[]): SearchResponse<T> {
  return {hits: {hits}, took: 0, timed_out: false, _shards: {total: 1, failed: 0, successful: 1}};
}

const message = JSON.parse(
  await readFile('node_modules/@openstapps/core/test/resources/indexable/Message.1.json', 'utf8'),
);
const book = JSON.parse(
  await readFile('node_modules/@openstapps/core/test/resources/indexable/Book.1.json', 'utf8'),
);

describe('Elasticsearch', function () {
  // increase timeout for the suite
  this.timeout(DEFAULT_TEST_TIMEOUT);
  const sandbox = sinon.createSandbox();

  before(function () {
    // eslint-disable-next-line no-console
    console.log('before');
    sandbox.stub(fs, 'readFileSync').returns('{}');
  });
  after(function () {
    sandbox.restore();
  });

  describe('getElasticsearchUrl', function () {
    it('should provide custom elasticsearch URL if defined', function () {
      const customAddress = 'http://foo-address:9200';
      // @ts-expect-error wrong type defs for some reason
      const restore = mockedEnv({
        ES_ADDR: customAddress,
      });

      expect(Elasticsearch.getElasticsearchUrl()).to.be.equal(customAddress);
      // restore env variables
      restore();
    });

    it('should provide local URL as fallback', function () {
      // @ts-expect-error wrong type defs for some reason
      const restore = mockedEnv({
        ES_ADDR: undefined,
      });

      expect(Elasticsearch.getElasticsearchUrl()).to.match(/(https?:\/\/)?localhost(:\d+)?/);
      // restore env variables
      restore();
    });
  });

  describe('getAliasMap', function () {
    it('should fail after retries', async function () {
      const es = new Elasticsearch(backendConfig);
      sandbox.stub(es.client.indices, 'getAlias').throws();
      await expect(es.init({maxRetries: 1, retryInterval: 10})).to.be.rejected;
    });
  });

  describe('getIndex (including getIndexUID)', function () {
    const type = 'foo bar type';
    const source = 'foo_source';
    const bulk: SCBulkResponse = {
      expiration: '',
      source: '',
      state: 'in progress',
      type: SCThingType.Semester,
      uid: 'bulk-uid-123-123-123',
    };

    it('should provide index UID from the provided UID', function () {
      const indexUID = getIndexUID(bulk.uid);

      expect(indexUID.length).to.be.equal(INDEX_UID_LENGTH);
      // test starting and ending character
      expect(indexUID[0]).to.be.equal(bulk.uid[0]);
      expect(indexUID[indexUID.length - 1]).to.be.equal(bulk.uid[INDEX_UID_LENGTH - 1]);
    });

    it('should provide index name from the provided data', function () {
      expect(getThingIndexName(type as SCThingType, source, bulk)).to.be.equal(
        `stapps_${type.split(' ').join('_')}_${source}_${getIndexUID(bulk.uid)}`,
      );
    });

    it('should reject invalid index names', function () {
      expect(() => parseIndexName(':)')).to.throw(SyntaxError);
    });
  });

  describe('removeAliasChars', function () {
    it('should remove spaces from both ends', function () {
      expect(removeInvalidAliasChars(' foobaralias ', 'bulk-uid')).to.be.equal('foobaralias');
    });

    it('should replace inner spaces with underscores', function () {
      expect(removeInvalidAliasChars('foo bar alias', 'bulk-uid')).to.be.equal('foo_bar_alias');
    });

    it('should remove invalid characters', function () {
      expect(removeInvalidAliasChars('f,o#o\\b|ar/<?alias>* ', 'bulk-uid')).to.be.equal('foobaralias');
    });

    it('should remove invalid starting characters', function () {
      expect(removeInvalidAliasChars('-foobaralias', 'bulk-uid')).to.be.equal('foobaralias');
      expect(removeInvalidAliasChars('_foobaralias', 'bulk-uid')).to.be.equal('foobaralias');
      expect(removeInvalidAliasChars('+foobaralias', 'bulk-uid')).to.be.equal('foobaralias');
    });

    it('should replace with a placeholder in case of invalid alias', function () {
      expect(removeInvalidAliasChars('.', 'bulk-uid')).to.contain('placeholder');
      expect(removeInvalidAliasChars('..', 'bulk-uid')).to.contain('placeholder');
    });

    it('should work with common cases', function () {
      expect(
        removeInvalidAliasChars('the-quick-brown-fox-jumps-over-the-lazy-dog-1234567890', 'bulk-uid'),
      ).to.be.equal('the-quick-brown-fox-jumps-over-the-lazy-dog-1234567890');
      expect(removeInvalidAliasChars('THE_QUICK_BROWN_FOX_JUMPS_OVER_THE_LAZY_DOG', 'bulk-uid')).to.be.equal(
        'THE_QUICK_BROWN_FOX_JUMPS_OVER_THE_LAZY_DOG',
      );
    });

    it('should warn in case of characters that are invalid in future elasticsearch versions', function () {
      const sandbox = sinon.createSandbox();
      const loggerWarnStub = sandbox.stub(Logger, 'warn');

      expect(removeInvalidAliasChars('foo:bar:alias', 'bulk-uid')).to.contain('foo:bar:alias');
      expect(loggerWarnStub.called).to.be.true;
    });
  });

  describe('constructor', async function () {
    const sandbox = sinon.createSandbox();
    afterEach(function () {
      sandbox.restore();
    });

    it('should complain (throw an error) if database in config is undefined', function () {
      const config: SCConfigFile = {
        ...backendConfig,
        internal: {...backendConfig.internal, database: undefined},
      };

      expect(() => new Elasticsearch(config)).to.throw(Error);
    });

    it('should complain (throw an error) if database version is not a string', function () {
      const config: SCConfigFile = {
        ...backendConfig,
        internal: {
          ...backendConfig.internal,
          database: {
            name: 'foo',
            version: 123,
          },
        },
      };

      expect(() => new Elasticsearch(config)).to.throw(Error);
    });

    it('should log an error in case of there is one when getting response from the elasticsearch client', async function () {
      const error = new Error('Foo Error');
      const loggerErrorStub = sandbox.stub(Logger, 'error').resolves('foo');
      sandbox.stub(Diagnostic.prototype, 'on').yields(error);

      new Elasticsearch(backendConfig);

      expect(loggerErrorStub.calledWith(error)).to.be.true;
    });

    it('should log the result in the debug mode when getting response from the elasticsearch client', async function () {
      const fakeResponse = {foo: 'bar'};
      const loggerLogStub = sandbox.stub(Logger, 'log');
      sandbox.stub(Diagnostic.prototype, 'on').yields(null, fakeResponse);

      new Elasticsearch(backendConfig);
      expect(loggerLogStub.calledWith(fakeResponse)).to.be.false;

      // @ts-expect-error wrong type defs for some reason
      const restore = mockedEnv({
        ES_DEBUG: 'true',
      });
      new Elasticsearch(backendConfig);

      expect(loggerLogStub.calledWith(fakeResponse)).to.be.true;
      // restore env variables
      restore();
    });

    describe('init', async function () {
      const sandbox = sinon.createSandbox();
      after(function () {
        sandbox.restore();
      });

      it('should complain (throw an error) if monitoring is set but mail queue is undefined', async function () {
        const config: SCConfigFile = {
          ...backendConfig,
          internal: {
            ...backendConfig.internal,
            monitoring: {
              actions: [],
              watchers: [],
            },
          },
        };

        const es = new Elasticsearch(config);

        return expect(es.init()).to.be.rejected;
      });

      it('should setup the monitoring if there is monitoring is set and mail queue is defined', function () {
        const config: SCConfigFile = {
          ...backendConfig,
          internal: {
            ...backendConfig.internal,
            monitoring: {
              actions: [],
              watchers: [
                {
                  triggers: [{executionTime: 'daily', name: 'trigger'}],
                  name: 'watcher',
                  actions: [],
                  query: {},
                  conditions: [],
                },
              ],
            },
          },
        };
        const cronSetupStub = sandbox.stub(cron, 'schedule');

        const es = new Elasticsearch(config, new MailQueue(getTransport(false) as unknown as SMTP));
        es.init();

        expect(cronSetupStub.called).to.be.true;
      });
    });

    describe('Operations with bundle/index', async function () {
      const sandbox = sinon.createSandbox();
      let es: Elasticsearch;
      let createStub: SinonStub;
      let deleteStub: SinonStub;
      let refreshStub: SinonStub;
      let updateAliasesStub: SinonStub;
      const oldIndex = 'stapps_footype_foosource_oldindex';

      beforeEach(function () {
        sandbox
          .stub(Indices.default.prototype, 'getAlias')
          .resolves({[oldIndex]: {aliases: {[SCThingType.Book]: {}}}} as any);
        sandbox.stub(Indices.default.prototype, 'putTemplate').resolves({} as any);
        createStub = sandbox.stub(Indices.default.prototype, 'create').resolves({} as any);
        deleteStub = sandbox.stub(Indices.default.prototype, 'delete').resolves({} as any);
        refreshStub = sandbox.stub(Indices.default.prototype, 'refresh').resolves({} as any);
        updateAliasesStub = sandbox.stub(Indices.default.prototype, 'updateAliases').resolves({} as any);
        es = new Elasticsearch(backendConfig);
      });

      afterEach(function () {
        sandbox.restore();
      });

      describe('bulkCreated', async function () {
        it('should reject (throw an error) if the connection to elasticsearch is not established', async function () {
          return expect(es.bulkCreated(bulk)).to.be.rejectedWith('elasticsearch');
        });

        it('should reject (throw an error) if the index name is not valid', async function () {
          sandbox.createStubInstance(Client, {});
          const invalidBulk = {...bulk, source: '%#$^'};
          await es.init();

          return expect(es.bulkCreated(invalidBulk)).to.be.rejectedWith('Index');
        });

        it('should create a new index', async function () {
          const index = getIndex();
          sandbox.stub(es, 'prepareBulkWrite').resolves(index);
          await es.init();
          await es.bulkCreated(bulk);

          expect(createStub.calledWith({index, aliases: {[INACTIVE_INDICES_ALIAS]: {}}})).to.be.true;
        });
      });

      describe('bulkExpired', async function () {
        const sandbox = sinon.createSandbox();
        afterEach(function () {
          sandbox.restore();
        });
        it('should cleanup index in case of the expired bulk for bulk whose index is not in use', async function () {
          sandbox.stub(es, 'prepareBulkWrite').resolves(getIndex());

          await es.init();
          await es.bulkExpired({...bulk, state: 'in progress'});

          expect(deleteStub.called).to.be.true;
        });

        it('should not cleanup index in case of the expired bulk for bulk whose index is in use', async function () {
          sandbox.stub(es, 'prepareBulkWrite').resolves(getIndex());

          await es.init();
          await es.bulkExpired({...bulk, state: 'done'});

          expect(deleteStub.called).to.be.false;
        });
      });

      describe('bulkUpdated', function () {
        it('should reject if the connection to elasticsearch is not established', async function () {
          return expect(es.bulkUpdated(bulk)).to.be.rejectedWith('elasticsearch');
        });

        it('should reject if the index name is not valid', async function () {
          const invalidBulk = {...bulk, source: '%#$^'};
          sandbox.createStubInstance(Client, {});
          await es.init();

          return expect(es.bulkUpdated(invalidBulk)).to.be.rejectedWith('Index');
        });

        it("should refuse to finalize bulk if index doesn't exist", async function () {
          await es.init();
          refreshStub.throws();
          await expect(es.bulkUpdated(bulk)).to.eventually.throw;

          expect(
            refreshStub.calledWith({
              index: getThingIndexName(bulk.type, bulk.source, bulk),
              allow_no_indices: false,
            }),
          ).to.be.true;
        });

        it('should create a new index', async function () {
          const index = getIndex();
          const expectedRefreshActions = [
            {
              add: {index: index, alias: ACTIVE_INDICES_ALIAS},
            },
            {
              remove: {index: index, alias: INACTIVE_INDICES_ALIAS},
            },
            {
              remove_index: {index: oldIndex},
            },
          ];
          sandbox.stub(es, 'prepareBulkWrite').resolves(index);
          await es.init();
          await es.bulkUpdated(bulk);

          expect(refreshStub.calledWith({index, allow_no_indices: false})).to.be.true;
          expect(
            updateAliasesStub.calledWith({
              actions: expectedRefreshActions,
            }),
          ).to.be.true;
        });
      });
    });

    describe('get', async function () {
      let es: Elasticsearch;
      const sandbox = sinon.createSandbox();

      before(function () {
        es = new Elasticsearch(backendConfig);
      });

      afterEach(function () {
        sandbox.restore();
      });

      it('should reject if object is not found', async function () {
        sandbox.stub(es.client, 'search').resolves(searchResponse());

        return expect(es.get('123')).to.rejectedWith('found');
      });

      it('should provide the thing if object is found', async function () {
        const foundObject: SearchHit<SCMessage> = {
          _id: '',
          _index: '',
          _score: 0,
          _source: message as SCMessage,
        };
        sandbox.stub(es.client, 'search').resolves(searchResponse(foundObject));

        return expect(await es.get('123')).to.be.eql(message);
      });
    });

    describe('post', async function () {
      let es: Elasticsearch;
      const sandbox = sinon.createSandbox();

      before(function () {
        es = new Elasticsearch(backendConfig);
      });

      beforeEach(function () {
        sandbox.stub(Indices.default.prototype, 'getAlias').resolves({} as any);
      });

      afterEach(function () {
        sandbox.restore();
      });

      it('should not post if the object already exists in an index which will not be rolled over', async function () {
        const index = getIndex();
        const oldIndex = index.replace('foosource', 'barsource');
        const object: SearchHit<SCMessage> = {
          _id: '',
          _index: oldIndex,
          _source: message as SCMessage,
        };
        sandbox.stub(es.client, 'search').resolves(searchResponse<SCMessage>(object));
        sandbox.stub(es, 'prepareBulkWrite').resolves(index);

        await es.init();
        return expect(es.post(object._source!, bulk)).to.be.rejectedWith('UID conflict');
      });

      it('should reject if there is an object creation error on the elasticsearch side', async function () {
        sandbox.stub(es.client, 'search').resolves(searchResponse());
        sandbox.stub(es.client, 'create').resolves({result: 'not_found'} as CreateResponse);

        await es.init();
        return expect(es.post(message as SCMessage, bulk)).to.rejectedWith('creation');
      });

      it('should create a new object', async function () {
        let caughtParameter: any;
        sandbox.stub(es.client, 'search').resolves(searchResponse());
        // @ts-expect-error call
        const createStub = sandbox.stub(es.client, 'create').callsFake(parameter => {
          caughtParameter = parameter;
          return Promise.resolve({result: 'created'});
        });

        await es.init();
        await es.post(message as SCMessage, bulk);

        expect(createStub.called).to.be.true;
        expect(caughtParameter.document).to.be.eql({
          ...message,
          creation_date: caughtParameter.document.creation_date,
        });
      });
    });

    describe('put', async function () {
      let es: Elasticsearch;
      const sandbox = sinon.createSandbox();

      before(function () {
        es = new Elasticsearch(backendConfig);
      });
      afterEach(function () {
        sandbox.restore();
      });
      it('should reject to put if the object does not already exist', async function () {
        const object: SearchHit<SCMessage> = {
          _id: '',
          _index: getIndex(),
          _score: 0,
          _source: message as SCMessage,
        };
        sandbox.stub(es.client, 'search').resolves(searchResponse());

        return expect(es.put(object._source!)).to.rejectedWith('exist');
      });

      // noinspection JSUnusedLocalSymbols
      it('should update the object if it already exists', async function () {
        let caughtParameter: any;
        const object: SearchHit<SCMessage> = {
          _id: '',
          _index: getIndex(),
          _score: 0,
          _source: message as SCMessage,
        };
        sandbox.stub(es.client, 'search').resolves(searchResponse(object));
        // @ts-expect-error unused
        // eslint-disable-next-line @typescript-eslint/no-unused-vars
        const stubUpdate = sandbox.stub(es.client, 'update').callsFake(parameters => {
          caughtParameter = parameters;
          return Promise.resolve({body: {created: true}});
        });

        await es.put(object._source!);

        expect(caughtParameter.body.doc).to.be.eql(object._source);
      });
    });

    describe('search', async function () {
      let es: Elasticsearch;
      const sandbox = sinon.createSandbox();
      const objectMessage: SearchHit<SCMessage> = {
        _id: '123',
        _index: getIndex(),
        _score: 0,
        _source: message as SCMessage,
      };
      const objectBook: SearchHit<SCBook> = {
        _id: '321',
        _index: getIndex(),
        _score: 0,
        _source: book as SCBook,
      };
      const fakeEsAggregations = {
        '@all': {
          doc_count: 17,
          type: {
            doc_count_error_upper_bound: 0,
            sum_other_doc_count: 0,
            buckets: [
              {
                key: 'person',
                doc_count: 13,
              },
              {
                key: 'catalog',
                doc_count: 4,
              },
            ],
          },
        },
      };
      const fakeSearchResponse: SearchResponse<SCThings> = {
        took: 12,
        timed_out: false,
        // @ts-expect-error not assignable
        _shards: {},
        hits: {
          hits: [objectMessage, objectBook],
          total: 123,
        },
        aggregations: fakeEsAggregations,
      };
      let searchStub: sinon.SinonStub;
      before(function () {
        es = new Elasticsearch(backendConfig);
      });
      beforeEach(function () {
        searchStub = sandbox.stub(es.client, 'search').resolves(fakeSearchResponse);
      });
      afterEach(function () {
        sandbox.restore();
      });

      it('should provide appropriate data and facets', async function () {
        const fakeFacets = [
          {
            buckets: [
              {
                count: 13,
                key: 'person',
              },
              {
                count: 4,
                key: 'catalog',
              },
            ],
            field: 'type',
          },
        ];

        const {data, facets} = await es.search({});

        expect(data).to.be.eql([objectMessage._source, objectBook._source]);
        expect(facets).to.be.eql(fakeFacets);
      });

      it('should provide pagination from params', async function () {
        const from = 30;
        const {pagination} = await es.search({from});

        expect(pagination).to.be.eql({
          count: fakeSearchResponse.hits.hits.length,
          offset: from,
          total: fakeSearchResponse.hits.total,
        });
      });

      it('should have fallback to zero if from is not given through params', async function () {
        const {pagination} = await es.search({});

        expect(pagination.offset).to.be.equal(0);
      });

      it('should build the search request properly', async function () {
        const parameters: SCSearchQuery = {
          query: 'mathematics',
          from: 30,
          size: 5,
          sort: [
            {
              type: 'ducet',
              order: 'desc',
              arguments: {
                field: 'name',
              },
            },
          ],
          filter: {
            type: 'value',
            arguments: {
              field: 'type',
              value: SCThingType.AcademicEvent,
            },
          },
        };

        await es.search(parameters);

        expect(searchStub.firstCall.firstArg).to.be.deep.equal({
          aggs: aggregations,
          query,
          allow_no_indices: true,
          sort: [{'name.sort': 'desc'}],
          from: parameters.from,
          index: ACTIVE_INDICES_ALIAS,
          size: parameters.size,
        });
      });
    });
  });
});