//
// Copyright 2021 Vulcanize, Inc.
//

import assert from 'assert';
import 'reflect-metadata';
import yargs from 'yargs';
import { hideBin } from 'yargs/helpers';
import debug from 'debug';

import { getCache } from '@vulcanize/cache';
import { EthClient } from '@vulcanize/ipld-eth-client';
import {
  getConfig,
  JobQueue,
  JobRunner as BaseJobRunner,
  QUEUE_BLOCK_PROCESSING,
  QUEUE_EVENT_PROCESSING,
  JobQueueConfig,
  DEFAULT_CONFIG_PATH,
  getCustomProvider
} from '@vulcanize/util';

import { Indexer } from './indexer';
import { Database } from './database';

const log = debug('vulcanize:job-runner');

export class JobRunner {
  _indexer: Indexer
  _jobQueue: JobQueue
  _baseJobRunner: BaseJobRunner
  _jobQueueConfig: JobQueueConfig

  constructor (jobQueueConfig: JobQueueConfig, indexer: Indexer, jobQueue: JobQueue) {
    this._jobQueueConfig = jobQueueConfig;
    this._indexer = indexer;
    this._jobQueue = jobQueue;
    this._baseJobRunner = new BaseJobRunner(this._jobQueueConfig, this._indexer, this._jobQueue);
  }

  async start (): Promise<void> {
    await this.subscribeBlockProcessingQueue();
    await this.subscribeEventProcessingQueue();
  }

  async subscribeBlockProcessingQueue (): Promise<void> {
    await this._jobQueue.subscribe(QUEUE_BLOCK_PROCESSING, async (job) => {
      await this._baseJobRunner.processBlock(job);

      await this._jobQueue.markComplete(job);
    });
  }

  async subscribeEventProcessingQueue (): Promise<void> {
    await this._jobQueue.subscribe(QUEUE_EVENT_PROCESSING, async (job) => {
      const event = await this._baseJobRunner.processEvent(job);

      if (!event) {
        return;
      }

      const watchedContract = await this._indexer.isWatchedContract(event.contract);
      if (watchedContract) {
        await this._indexer.processEvent(event);
      }

      await this._indexer.updateBlockProgress(event.block, event.index);
      await this._jobQueue.markComplete(job);
    });
  }
}

export const main = async (): Promise<any> => {
  const argv = await yargs(hideBin(process.argv))
    .option('f', {
      alias: 'config-file',
      demandOption: true,
      describe: 'configuration file path (toml)',
      type: 'string',
      default: DEFAULT_CONFIG_PATH
    })
    .argv;

  const config = await getConfig(argv.f);

  assert(config.server, 'Missing server config');

  const { upstream, database: dbConfig, jobQueue: jobQueueConfig, server: { mode } } = config;

  assert(dbConfig, 'Missing database config');

  const db = new Database(dbConfig);
  await db.init();

  assert(upstream, 'Missing upstream config');
  const { ethServer: { gqlApiEndpoint, gqlPostgraphileEndpoint, rpcProviderEndpoint }, cache: cacheConfig } = upstream;
  assert(gqlApiEndpoint, 'Missing upstream ethServer.gqlApiEndpoint');
  assert(gqlPostgraphileEndpoint, 'Missing upstream ethServer.gqlPostgraphileEndpoint');

  const cache = await getCache(cacheConfig);
  const ethClient = new EthClient({
    gqlEndpoint: gqlApiEndpoint,
    gqlSubscriptionEndpoint: gqlPostgraphileEndpoint,
    cache
  });

  const postgraphileClient = new EthClient({
    gqlEndpoint: gqlPostgraphileEndpoint,
    cache
  });

  const ethProvider = getCustomProvider(rpcProviderEndpoint);

  assert(jobQueueConfig, 'Missing job queue config');

  const { dbConnectionString, maxCompletionLagInSecs } = jobQueueConfig;
  assert(dbConnectionString, 'Missing job queue db connection string');

  const jobQueue = new JobQueue({ dbConnectionString, maxCompletionLag: maxCompletionLagInSecs });
  await jobQueue.start();

  const indexer = new Indexer(db, ethClient, postgraphileClient, ethProvider, jobQueue, mode);

  const jobRunner = new JobRunner(jobQueueConfig, indexer, jobQueue);
  await jobRunner.start();
};

main().then(() => {
  log('Starting job runner...');
}).catch(err => {
  log(err);
});

process.on('uncaughtException', err => {
  log('uncaughtException', err);
});