Charshav

'use strict';

function main(arr) {
  let plantCount = Number(arr[0]);
  const plantContainer = {};

  //Create class
  class Plant {
    constructor(rarity) {
      this.rarity = rarity;
      this.ratings = [];
      this.average = 0;
    }

    Rate = rate;
    Update = update;
    Reset = reset;
    averageRating = averageRating;
  }

  for (let i = 1, l = plantCount + 1; i < l; i++) {
    let [plant, rarity] = arr[i].split('<->');
    rarity = Number(rarity);

    //If plant is already present, update its' rarity
    if (plantContainer.hasOwnProperty(plant)) {
      plantContainer[plant].rarity = rarity;
    } else {
      //Create a new plant
      plantContainer[plant] = new Plant(rarity);
    }
  }

  //Get indices of commands
  let startIndex = plantCount + 1;
  let endIndex = arr.indexOf('Exhibition');

  //Slice just the commands
  let commandArr = arr.slice(startIndex, endIndex);

  //Loop through commands
  commandArr.forEach((line) => {
    let [command, ...rest] = line.split(': ');
    let args = rest.shift().split(' - ');
    let plant = args.shift();

    //Execute command
    if (plantContainer[plant]) {
      plantContainer[plant][command](args);
    } else {
      console.log('error');
    }
  });

  //Set averages
  Object.keys(plantContainer).forEach((key) => {
    plantContainer[key].averageRating();
  });

  //Sort
  let sortedKeys = Object.keys(plantContainer).sort((plantA, plantB) => {
    //Rarities
    let rarityPlantA = plantContainer[plantA].rarity;
    let rarityPlantB = plantContainer[plantB].rarity;

    if (rarityPlantA === rarityPlantB) {
      //Average ratings
      let avgPlantA = plantContainer[plantA].average;
      let avgPlantB = plantContainer[plantB].average;

      return avgPlantB - avgPlantA;
    } else {
      return rarityPlantB - rarityPlantA;
    }
  });

  //Output
  const output = [];

  sortedKeys.forEach((plant) => {
    let rarity = plantContainer[plant].rarity;
    let average = plantContainer[plant].average;

    output.push(`- ${plant}; Rarity: ${rarity}; Rating: ${average.toFixed(2)}`);
  });

  console.log('Plants for the exhibition:');
  console.log(output.join('\n'));

  //Declarations
  function rate(params) {
    let [rating] = params.map(Number);

    //Add the given rating
    //Store all ratings
    this.ratings.push(rating);
  }

  function update(params) {
    let [rarity] = params.map(Number);

    //Update the rarity with the new one
    this.rarity = rarity;
  }

  function reset(params) {
    //Remove all ratings
    this.ratings = [];
  }

  function averageRating() {
    if (this.ratings.length === 0) {
      this.average = 0;
      return;
    }

    let summed = this.ratings.reduce((acc, cur) => {
      return acc + cur;
    }, 0);

    this.average = summed / this.ratings.length;
  }
}

let result = main([
  '3',
  'Arnoldii<->4',
  'Woodii<->7',
  'Welwitschia<->2',
  'Rate: Woodii - 10',
  'Rate: Welwitschia - 7',
  'Rate: Arnoldii - 3',
  'Rate: Woodii - 5',
  'Update: Woodii - 5',
  'Reset: Arnoldii',
  'Exhibition',
]);
console.log(result);