leetcodeScraper.js

const axios = require('axios');
// TODO: CLEAN THIS DAMN FILE IT IS UGLYYYYYYYYYYYYY MAKE IT A SINGLE FUNCTION
const ENDPOINT = "https://leetcode.com/api/problems/algorithms/"
const ENDPOINT_LINK = "https://leetcode.com/problems/"

const getRandomProblem = async (difficulty) => {
  return await axios.get(ENDPOINT).then(resp => {
    // extracting questions count and number of questions from total questions.
    let questions = resp.data.stat_status_pairs

    // check for only free questions.
    questions.filter(question => question.paid_only == false)

    // TODO: check whether question is solved or not

    let questions_count = questions.length
    let index,question;
    do {
      index = Math.floor(Math.random() * questions_count);
      question = questions[index]
      if(difficulty===-1) break;
    } while(difficulty!=question.difficulty.level)
    // choosing a random index from the lot
    
    return {
      id: question.stat.question_id,
      title: question.stat.question__title,
      link: `${ENDPOINT_LINK}${question.stat.question__title_slug}`,
      difficulty: question.difficulty.level
    }
  })
  .catch(err => {console.log(err);return null;})
}

const getRandomProblems = async (count, difficulties) => {
  let i=0;
  let output = [];
  let questions = (await axios.get(ENDPOINT)).data.stat_status_pairs.filter(question => question.paid_only == false);
  let questions_count = questions.length;
  while (i!=count){
    let index = Math.floor(Math.random() * questions_count);
    let question = questions[index]
    if (difficulties.length > i && question.difficulty.level != difficulties[i]) continue;
    output.push({
      id: question.stat.question_id,
      title: question.stat.question__title,
      link: `${ENDPOINT_LINK}${question.stat.question__title_slug}`,
      difficulty: question.difficulty.level
    })
    i+=1;
  }
  return output;
}

module.exports = {
  getRandomProblem,
  getRandomProblems
};