1  'use server';
 2  
 3  import _lodash from 'lodash';
 4  import seedrandom from 'seedrandom';
 5  import {imageHash} from '@luludev/image-hash'
 6  
 7  // Resolve
 8  // const imageBuffer = fs.readFileSync('./example.png')
 9  // const hash = imageHash(imageBuffer)
10  // => ffee6f66ea356e6c6d5...
11  
12  import Papa from 'papaparse';
13  import {promises as fs} from 'fs';
14  import path from 'path';
15  
16  async function getCSV(filename: string) : Promise<Array<string>> {
17    const data = Papa.parse(
18      await fs.readFile(path.resolve('public/', filename), {encoding: 'utf-8'}),
19      {
20        header: true,
21        complete: (results: any) => {
22          console.log(results);
23        },
24      },
25    );
26    return data.data as Array<string>;
27  }
28  
29  // create a new lodash instance with the given seed
30  // https://stackoverflow.com/questions/76705788/how-to-seed-lodash-random-number-generator
31  const seedLodash = (seed: string) => {
32    return new Promise((resolve, reject) => {
33      try {
34        // take a snapshot of the current Math.random() fn
35        const orig = Math.random;
36        // replace Math.random with the seeded random
37        seedrandom(seed, {global: true});
38        // runInContext() creates a new lodash instance using the seeded Math.random()
39        // the context is a snapshot of the state of the global javascript environment, i.e. Math.random() updated to the seedrandom instance
40        const lodash = _lodash.runInContext();
41        // restore the original Math.random() fn
42        Math.random = orig;
43        // return the lodash instance with the seeded Math.random()
44        return lodash;
45      } catch (error) {
46        reject(console.log('IMAGE HASHING ERROR :: ', error));
47      }
48    });
49  };
50  
51  async function calcHashWords(hash: string): Promise<Array<string>> {
52    let words = await getCSV('../assets/words.csv'); // TODO: Jason's seed file here
53    let hashWords: Array<string> = [];
54    // const random = await seedLodash(hash).random(6);
55    const randomGenerator: any = await seedLodash(hash);
56    for (let i = 0; i < 6; i++) {
57      let r: number = Number(randomGenerator.random(words.length));
58      hashWords[i] = words[r];
59    }
60    return hashWords;
61  }
62  
63  async function CalcImageWords(image: any) {
64    const hashedImage = await imageHash(image);
65    return await calcHashWords(hashedImage);
66  }
67  
68  export default CalcImageWords;