let mood = 0;
let moodPerClick = 50; // FOR TESTING PURPOSES, SHOULD BE 1 IN PRODUCTION

const upgradesContainer = document.getElementById('upgrades');
const moodCounter = document.getElementById('mood-counter');
const favicon = document.getElementById('favicon');

function updateMoodCounter() {
  moodCounter.innerText = mood;

  updateUpgrades();

  if (mood < 100) {
    favicon.setAttribute('href', './assets/favicons/1.ico');
  } else if (mood < 1e3) {
    favicon.setAttribute('href', './assets/favicons/2.ico');
  } else if (mood < 1e5) {
    favicon.setAttribute('href', './assets/favicons/3.ico');
  } else if (mood < 1e9) {
    favicon.setAttribute('href', './assets/favicons/4.ico');
  } else if (mood < 1e16) {
    favicon.setAttribute('href', './assets/favicons/5.ico');
  } else if (mood < 1e19) {
    favicon.setAttribute('href', './assets/favicons/6.ico');
  } else if (mood < 1e22) {
    favicon.setAttribute('href', './assets/favicons/7.ico');
  }
}

function updateUpgrades() {
  upgradesContainer.innerHTML = '';

  upgrades.slice(0, 4).forEach((upgrade) => {
    const upgradeBtn = document.createElement('button');
    upgradeBtn.id = upgrade.id;
    upgradeBtn.className = 'upgrade';
    upgradeBtn.onclick = () => purchaseUpgrade(upgrade.id);
    
    if (mood < upgrade.cost) {
      upgradeBtn.style.opacity = 0.6;
      upgradeBtn.style.cursor = 'not-allowed';
    }

    const upgradeImg = document.createElement('img');
    upgradeImg.src = upgrade.image;
    upgradeImg.alt = upgrade.name + ' Upgrade';
    upgradeBtn.append(upgradeImg);

    upgradesContainer.append(upgradeBtn);
  });
}

function onLiftMoodClick() {
  mood += moodPerClick;
  updateMoodCounter();
}

function purchaseUpgrade(id) {
  const upgrade = upgrades.filter((upgrade) => upgrade.id === id)[0];

  if (mood >= upgrade.cost) {
    mood -= upgrade.cost;
    upgrades.shift();
    updateMoodCounter();
    upgrade.onPurchase();
  }
}

// UPGRADES

function enableSaves() {
}

function enableMusic() {
}

let upgrades = [
  {
    id: 'mood_lifter',
    name: 'Mood Lifter',
    description: 'Lift your Mood. +5/click',
    image: '../assets/img/upgrades/mood_lifter.png',
    cost: 50,
    onPurchase: () => moodPerClick += 5,
  },
  {
    id: 'saves',
    name: 'Free Disk Space',
    description: 'Enable saves',
    image: '../assets/img/upgrades/saves.png',
    cost: 300,
    onPurchase: enableSaves,
  },
    {
    id: 'calm_music',
    name: 'Old Radio',
    description: 'Turn on calm lo-fi music',
    image: '../assets/img/upgrades/calm_music.png',
    cost: 1000,
    onPurchase: enableMusic,
  },
];

updateUpgrades();