import {sleep} from 'k6';
import {SharedArray} from 'k6/data';
import exec from 'k6/execution';
import logging from 'k6/x/frostfs/logging';
import native from 'k6/x/frostfs/native';
import registry from 'k6/x/frostfs/registry';
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 {uuidv4} from './libs/k6-utils-1.4.0.js';

parseEnv();

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

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

const read_size = JSON.parse(open(__ENV.PREGEN_JSON)).obj_size;
const summary_json = __ENV.SUMMARY_JSON || '/tmp/summary.json';

// Select random gRPC endpoint for current VU
const grpc_endpoints = __ENV.GRPC_ENDPOINTS.split(',');
const grpc_endpoint =
    grpc_endpoints[Math.floor(Math.random() * grpc_endpoints.length)];
const grpc_client = native.connect(
    grpc_endpoint, '', __ENV.DIAL_TIMEOUT ? parseInt(__ENV.DIAL_TIMEOUT) : 5,
    __ENV.STREAM_TIMEOUT ? parseInt(__ENV.STREAM_TIMEOUT) : 60,
    __ENV.PREPARE_LOCALLY ? __ENV.PREPARE_LOCALLY.toLowerCase() === 'true' : false,
    1024 * parseInt(__ENV.MAX_OBJECT_SIZE || '0'));
const log = logging.new().withField('endpoint', grpc_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 read_age = __ENV.READ_AGE ? parseInt(__ENV.READ_AGE) : 10;
let obj_to_read_selector = undefined;
if (registry_enabled) {
  obj_to_read_selector = registry.getLoopedSelector(
      __ENV.REGISTRY_FILE, 'obj_to_read',
      __ENV.SELECTION_SIZE ? parseInt(__ENV.SELECTION_SIZE) : 0, {
        status : 'created',
        age : read_age,
      })
}

const scenarios = {};

const write_vu_count = parseInt(__ENV.WRITERS || '0');
const write_grpc_chunk_size = 1024 * parseInt(__ENV.GRPC_CHUNK_SIZE || '0')
const generator = newGenerator(write_vu_count > 0);
if (write_vu_count > 0) {
  scenarios.write = {
    executor : 'constant-vus',
    vus : write_vu_count,
    duration : `${duration}s`,
    exec : 'obj_write',
    gracefulStop : '5s',
  };
}

const delete_age = __ENV.DELETE_AGE ? parseInt(__ENV.DELETE_AGE) : undefined;
let obj_to_delete_selector = undefined;
let obj_to_delete_exit_on_null = undefined;
if (registry_enabled && delete_age) {
  obj_to_delete_exit_on_null = write_vu_count == 0;

  let constructor = obj_to_delete_exit_on_null ? registry.getOneshotSelector
                                               : registry.getSelector;

  obj_to_delete_selector =
      constructor(__ENV.REGISTRY_FILE, 'obj_to_delete',
                  __ENV.SELECTION_SIZE ? parseInt(__ENV.SELECTION_SIZE) : 0, {
                    status : 'created',
                    age : delete_age,
                  });
}

const read_vu_count = parseInt(__ENV.READERS || '0');
if (read_vu_count > 0) {
  scenarios.read = {
    executor : 'constant-vus',
    vus : read_vu_count,
    duration : `${duration}s`,
    exec : 'obj_read',
    gracefulStop : '5s',
  };
}

const delete_vu_count = parseInt(__ENV.DELETERS || '0');
if (delete_vu_count > 0) {
  if (!obj_to_delete_selector) {
    throw new Error(
        'Positive DELETE worker number without a proper object selector');
  }

  scenarios.delete = {
    executor : 'constant-vus',
    vus : delete_vu_count,
    duration : `${duration}s`,
    exec : 'obj_delete',
    gracefulStop : '5s',
  };
}

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

export function setup() {
  const total_vu_count = write_vu_count + read_vu_count + delete_vu_count;

  console.log(`Pregenerated containers:       ${container_list.length}`);
  console.log(`Pregenerated read object size: ${read_size}`);
  console.log(`Pregenerated total objects:    ${obj_list.length}`);
  console.log(`Reading VUs:                   ${read_vu_count}`);
  console.log(`Writing VUs:                   ${write_vu_count}`);
  console.log(`Deleting VUs:                  ${delete_vu_count}`);
  console.log(`Total VUs:                     ${total_vu_count}`);

  const start_timestamp = Date.now()
  console.log(
      `Load started at:               ${Date(start_timestamp).toString()}`)
}

export function teardown(data) {
  if (obj_registry) {
    obj_registry.close();
  }
  const end_timestamp = Date.now()
  console.log(
      `Load finished at:              ${Date(end_timestamp).toString()}`)
}

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

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

  const headers = {unique_header : uuidv4()};
  const container =
      container_list[Math.floor(Math.random() * container_list.length)];

  const payload = generator.genPayload();
  const resp =
      grpc_client.put(container, headers, payload, write_grpc_chunk_size);
  if (!resp.success) {
    log.withField('cid', container).error(resp.error);
    return;
  }

  if (obj_registry) {
    obj_registry.addObject(container, resp.object_id, '', '', payload.hash());
  }
}

export function obj_read() {
  if (__ENV.SLEEP_READ) {
    sleep(__ENV.SLEEP_READ);
  }

  if (obj_to_read_selector) {
    const obj = obj_to_read_selector.nextObject();
    if (!obj) {
      return;
    }
    const resp = grpc_client.get(obj.c_id, obj.o_id)
    if (!resp.success) {
      log.withFields({cid : obj.c_id, oid : obj.o_id}).error(resp.error);
    }
    return
  }

  const obj = obj_list[Math.floor(Math.random() * obj_list.length)];
  const resp = grpc_client.get(obj.container, obj.object)
  if (!resp.success) {
    log.withFields({cid : obj.container, oid : obj.object}).error(resp.error);
  }
}

export function obj_delete() {
  if (__ENV.SLEEP_DELETE) {
    sleep(__ENV.SLEEP_DELETE);
  }

  const obj = obj_to_delete_selector.nextObject();
  if (!obj) {
    if (obj_to_delete_exit_on_null) {
      exec.test.abort("No more objects to select");
    }
    return;
  }

  const resp = grpc_client.delete(obj.c_id, obj.o_id);
  if (!resp.success) {
    // Log errors except (2052 - object already deleted)
    log.withFields({cid : obj.c_id, oid : obj.o_id}).error(resp.error);
    return;
  }

  obj_registry.deleteObject(obj.id);
}