function shuffle(array, seed) {                // <-- ADDED ARGUMENT
    var m = array.length, t, i;
  
    // While there remain elements to shuffle…
    while (m) {
  
      // Pick a remaining element…
      i = Math.floor(random(seed) * m--);        // <-- MODIFIED LINE
  
      // And swap it with the current element.
      t = array[m];
      array[m] = array[i];
      array[i] = t;
      ++seed                                     // <-- ADDED LINE
    }
  
    return array;
  }
  
function random(seed) {
var x = Math.sin(seed++) * 10000; 
return x - Math.floor(x);
}

async function fetchRestaurants() {
    const response = await fetch('restaurants.json');
    if (!response.ok) {
        throw new Error('Network response was not ok ' + response.statusText);
    }
    const data = await response.json();
    return data;
}


function getRandomRestaurants(restaurants, seed) {
    // Generate three random indices based on the seed
    randomRestaurants = shuffle(restaurants, seed);
    return randomRestaurants.slice(0,3);
}

async function displayRestaurants() {
    const today = new Date();
    const day = today.getDay();

    // Format the date
    const options = { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' };
    const formattedDate = today.toLocaleDateString(undefined, options);

    // Display the date
    document.getElementById('currentDate').innerText = `Today is ${formattedDate}`;

    // Only display suggestions on weekdays
    // if (day === 0 || day === 6) {
    //     document.getElementById('restaurants').innerHTML = "No suggestions available today!";
    //     return;
    // }

    const dateKey = today.toISOString().split('T')[0];
    let savedData = localStorage.getItem('restaurantSuggestions');

    if (savedData) {
        savedData = JSON.parse(savedData);
        if (savedData.date === dateKey) {
            document.getElementById('restaurants').innerHTML = savedData.restaurants.map(restaurant => 
                `<a href="${restaurant[1]}" target="_blank">${restaurant[0]}</a>`
            ).join('<br>');
            return;
        }
    }

    try {
        const restaurants = await fetchRestaurants();
        console.log('Fetched Restaurants:', restaurants); // Debugging: Print fetched restaurants
        const seed = today.getFullYear() * 10000 + (today.getMonth() + 1) * 100 + today.getDate(); // Create a seed from the date
        console.log('Random seed per day: ', seed);
        const randomRestaurants = getRandomRestaurants(restaurants, seed);
        console.log('Random Restaurants:', randomRestaurants); // Debugging: Print random restaurants
        document.getElementById('restaurants').innerHTML = randomRestaurants.map(restaurant => 
            `<a href="${restaurant[1]}" target="_blank">${restaurant[0]}</a>`
        ).join('<br>');

        const dataToSave = {
            date: dateKey,
            restaurants: randomRestaurants
        };

        localStorage.setItem('restaurantSuggestions', JSON.stringify(dataToSave));
    } catch (error) {
        console.error('Error fetching restaurants:', error);
        document.getElementById('restaurants').innerHTML = "Failed to load restaurant suggestions.";
    }
}

window.onload = displayRestaurants;