import s3 from 'k6/x/neofs/s3';
import crypto from 'k6/crypto';
import { SharedArray } from 'k6/data';
import { sleep } from 'k6';

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

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

const read_size = JSON.parse(open(__ENV.PREGEN_JSON)).obj_size;

/* 
   ./k6 run -e PROFILE=0:60 -e WRITE_OBJ_SIZE=1024 -e CLIENTS=200 -e NODES=node4.data:8084 -e PREGEN_JSON=test.json scenarios/s3_t.js

   Parse profile from env.
   Format write:obj_size:
     * write    - write operations in percent, relative to read operations
     * duration - duration in seconds

   OBJ_NAME - this name will be used for all write operations instead of randow generation in case of declared.
*/

const [ write, duration ] = __ENV.PROFILE.split(':');

// Set VUs between write and read operations
let vus_read = Math.ceil(__ENV.CLIENTS/100*(100-parseInt(write)))
let vus_write = __ENV.CLIENTS - vus_read

const payload = crypto.randomBytes(1024*parseInt(__ENV.WRITE_OBJ_SIZE))

let nodes = __ENV.NODES.split(',')
let rand_node = nodes[Math.floor(Math.random()*nodes.length)];

let s3_cli = s3.connect(`http://${rand_node}`)

let scenarios = {}

if (vus_write > 0){
    scenarios.write= {
        executor: 'constant-vus',
        vus: vus_write,
        duration: `${duration}s`,
        exec: 'obj_write', 
        gracefulStop: '5s',
    }
}

if (vus_read > 0){
    scenarios.read= {
        executor: 'constant-vus',
        vus: vus_read,
        duration: `${duration}s`,
        exec: 'obj_read', 
        gracefulStop: '5s',
    }
}

export function setup() {
    console.log("Pregenerated buckets: " + bucket_list.length)
    console.log("Pregenerated read object size: " + read_size)
    console.log("Pregenerated total objects: " + obj_list.length)
}

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

export function obj_write() {
    let key = "";
    if (__ENV.OBJ_NAME){
        key = __ENV.OBJ_NAME;
    } 
    else{
        key = uuidv4();
    }
    

    let bucket = bucket_list[Math.floor(Math.random()*bucket_list.length)];
    let resp = s3_cli.put(bucket, key, payload)
    
    if (!resp.success) {
        console.log(resp.error);
    } 

    if (__ENV.SLEEP) {
        sleep(__ENV.SLEEP);
    }
    
}

export function obj_read() {
    let random_read_obj = obj_list[Math.floor(Math.random()*obj_list.length)];

    let resp = s3_cli.get(random_read_obj.bucket, random_read_obj.object)
    if (!resp.success) {
        console.log(resp.error);
    } 
    
    if (__ENV.SLEEP) {
        sleep(__ENV.SLEEP);
    }

}

export function uuidv4() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
      let r = Math.random() * 16 | 0, v = c === 'x' ? r : (r & 0x3 | 0x8);
      return v.toString(16);
    });
  }