Pokedex Bot: Pokemon description and evolution endpoint in server.js

Pokemon description and evolution endpoint in server.js

if (pokemon_species_endpoint.indexOf(specs) !== -1 || intent.displayName == 'evolution') {

    const { data } = await axios_instance.get(`/pokemon-species/${pokemon}`);

    const evolution_chain_id = data.evolution_chain.url.split('/')[6];
    const text = data.flavor_text_entries.find(item => {
      return item.language.name == 'en';
    });

    let fulfillmentText;
    if (specs == 'description') {
      fulfillmentText = `${pokemon}:\n\n ${text.flavor_text}`;
      Object.assign(response_obj, {
        fulfillmentText
      });
    } 

    if (intent.displayName == 'evolution') {
      const evolution_response = await axios_instance.get(`/evolution-chain/${evolution_chain_id}`);
      const evolution_requirement = parameters.evolutions;
    
      let pokemon_evolutions = [evolution_response.data.chain.species.name];
      fulfillmentText = `${pokemon} has no evolution`;

      if (evolution_response.data.chain.evolves_to.length) {
        pokemon_evolutions.push(evolution_response.data.chain.evolves_to[0].species.name);
      }

      if (evolution_response.data.chain.evolves_to[0].evolves_to.length) {
        pokemon_evolutions.push(evolution_response.data.chain.evolves_to[0].evolves_to[0].species.name);
      }

      let evolution_chain = pokemon_evolutions.join(' -> ');
      
      const order_in_evolution_chain = pokemon_evolutions.indexOf(pokemon);
      const next_form = pokemon_evolutions[order_in_evolution_chain + 1];
      const previous_form = pokemon_evolutions[order_in_evolution_chain - 1];

      const evolution_text = {
        'evolution_chain': `${pokemon}'s evolution chain is: ${evolution_chain}`,
        'first_evolution': (pokemon == pokemon_evolutions[0]) ? `This is already the first form` : `${pokemon_evolutions[0]} is the first evolution`,
        'last_evolution': (pokemon == pokemon_evolutions[pokemon_evolutions.length - 1]) ? `This is already the final form` : pokemon_evolutions[pokemon_evolutions.length - 1],
        'next_form': `${pokemon} evolves to ${next_form}`,
        'previous_form': `${pokemon} evolves from ${previous_form}`
      };

      if (evolution_text[evolution_requirement]) {
        fulfillmentText = evolution_text[evolution_requirement];
      }

      Object.assign(response_obj, {
        fulfillmentText
      });
    }
  }