import {sleep} from 'k6';
import {SharedArray} from 'k6/data';
import logging from 'k6/x/frostfs/logging';
import registry from 'k6/x/frostfs/registry';
import s3 from 'k6/x/frostfs/s3';
import stats from 'k6/x/frostfs/stats';

import {newGenerator} from './libs/datagen.js';
import {parseEnv} from './libs/env-parser.js';
import {textSummary} from './libs/k6-summary-0.0.2.js';
import {generateS3Key} from './libs/keygen.js';

parseEnv();

const bucket_list = new SharedArray(
    'bucket_list',
    function() { return JSON.parse(open(__ENV.PREGEN_JSON)).buckets; });

const summary_json = __ENV.SUMMARY_JSON || '/tmp/summary.json';

// Select random S3 endpoint for current VU
const s3_endpoints = __ENV.S3_ENDPOINTS.split(',');
const s3_endpoint =
    s3_endpoints[Math.floor(Math.random() * s3_endpoints.length)];
const no_verify_ssl = __ENV.NO_VERIFY_SSL || 'true';
const connection_args = {
  no_verify_ssl : no_verify_ssl
};
const s3_client = s3.connect(s3_endpoint, connection_args);
const log = logging.new().withField('endpoint', s3_endpoint);

const registry_enabled = !!__ENV.REGISTRY_FILE;
const obj_registry =
    registry_enabled ? registry.open(__ENV.REGISTRY_FILE) : undefined;

const duration = __ENV.DURATION;

if (!!__ENV.METRIC_TAGS) {
  stats.setTags(__ENV.METRIC_TAGS)
}

const scenarios = {};

const write_vu_count = parseInt(__ENV.WRITERS || '0');
if (write_vu_count < 1) {
  throw 'number of VUs (env WRITERS) performing write operations should be greater than 0';
}

const write_multipart_vu_count = parseInt(__ENV.WRITERS_MULTIPART || '0');
if (write_multipart_vu_count < 1) {
  throw 'number of parts (env WRITERS_MULTIPART) to upload in parallel should be greater than 0';
}

const generator =
    newGenerator(write_vu_count > 0 || write_multipart_vu_count > 0);
if (write_vu_count > 0) {
  scenarios.write_multipart = {
    executor : 'constant-vus',
    vus : write_vu_count,
    duration : `${duration}s`,
    exec : 'obj_write_multipart',
    gracefulStop : '5s',
  };
}

export const options = {
  scenarios,
  setupTimeout : '5s',
};

export function setup() {
  const total_vu_count = write_vu_count * write_multipart_vu_count;

  console.log(`Pregenerated buckets:          ${bucket_list.length}`);
  console.log(`Writing VUs:                   ${write_vu_count}`);
  console.log(`Writing multipart VUs:         ${write_multipart_vu_count}`);
  console.log(`Total VUs:                     ${total_vu_count}`);
}

export function teardown(data) {
  if (obj_registry) {
    obj_registry.close();
  }
}

export function handleSummary(data) {
  return {
    'stdout' : textSummary(data, {indent : ' ', enableColors : false}),
    [summary_json] : JSON.stringify(data),
  };
}

const write_multipart_part_size =
    1024 * parseInt(__ENV.WRITE_OBJ_PART_SIZE || '0')
if (write_multipart_part_size < 5 * 1024 * 1024) {
  throw 'part size (env WRITE_OBJ_PART_SIZE * 1024) must be greater than (5 MB)';
}

export function obj_write_multipart() {
  if (__ENV.SLEEP_WRITE) {
    sleep(__ENV.SLEEP_WRITE);
  }

  const key = generateS3Key();
  const bucket = bucket_list[Math.floor(Math.random() * bucket_list.length)];

  const payload = generator.genPayload();
  const resp = s3_client.multipart(bucket, key, write_multipart_part_size,
                                   write_multipart_vu_count, payload);
  if (!resp.success) {
    log.withFields({bucket : bucket, key : key}).error(resp.error);
    return;
  }

  if (obj_registry) {
    obj_registry.addObject('', '', bucket, key, payload.hash());
  }
}