// variables
const urlBase = "https://api.punkapi.com/v2/beers?page=";
const filterABV = document.getElementById("filterABV");
const filterIBU = document.getElementById("filterIBU");
const pageText = document.getElementById("pageNumber");
const prevPage = document.getElementById("prevPage");
const nextPage = document.getElementById("nextPage");
let optionsABV = "", optionsIBU = "", page = 1;

// filters
filterABV.addEventListener("change", e => {
   const value = e.target.value; 
   
   switch (value) {
        case "all":
            optionsABV = "";
            break
        case "weak":
            optionsABV = "&abv_lt=4.6";
            break
        case "medium":
            optionsABV = "&abv_gt=4.5&abv_lt=7.6";
            break
        case "strong":
            optionsABV = "&abv_gt=7.5";
            break
   }
   
   page = 1;
   getBeers();
});

filterIBU.addEventListener("change", e => {
   const value = e.target.value; 
   
   switch (value) {
        case "all":
            optionsIBU = "";
            break
        case "weak":
            optionsIBU = "&ibu_lt=35";
            break
        case "medium":
            optionsIBU = "&ibu_gt=34&ibu_lt=75";
            break
        case "strong":
            optionsIBU = "&ibu_gt=74";
            break
   }
   
   page = 1;
   getBeers();
});

async function getBeers() {
    const url = urlBase + page + optionsABV + optionsIBU;
    // fetch
    const beerPromise = await fetch(url);
    const beers = await beerPromise.json();
    
    // pagination
    pageText.innerText = page;
    
    if(page === 1) {
        prevPage.disabled = true;
    } else {
        prevPage.disabled = false;
    }
    if(beers.length < 25) {
        nextPage.disabled = true;
    } else {
        nextPage.disabled = false;
    }
    
    // render data
    const beersDiv = document.querySelector('.beers');
    
    let beerHtml = "";
    const genericBottle = 'https://cdn.pixabay.com/photo/2014/12/22/00/04/bottle-576717_960_720.png';
    
    beers.forEach(beer => {
       beerHtml += `
        <div class='beer-wrapper card'>
            <div class='beer'>
                <img class='beer__img' src="${beer.image_url ? beer.image_url : genericBottle}">
                <h3>${beer.name}</h3>
                <span class='beer__info'>
                    <span>ABV: ${beer.abv}%</span>
                    <span>IBU: ${beer.ibu}</span>
                </span>
            </div>
            <div class='beer__content'>
                <div class='beer__name'>${beer.name}</div>
                <div class='beer__tagline'>${beer.tagline}</div>
                <div class='beer__description'>${beer.description}</div>
                <div class='beer__food-pairing'>
                    Pair with: ${beer.food_pairing.join(', ')}
                </div>
            </div>
        </div>
       `; 
    });
     
    beersDiv.innerHTML = beerHtml;
}

// pagination
prevPage.addEventListener('click', () => {
    page--;
    getBeers();
});
nextPage.addEventListener('click', () => {
    page++;
    getBeers();
});

// initial get
getBeers();