// Game dashboard: load character profile and populate stats.

let energyInterval = null;
let energyData = null; // store latest server energy data for sync

/**
 * Refresh energy state from the server at a fixed interval.
 * Keeps client-side countdown in sync with the authoritative server.
 */
function startEnergySync() {
  if (energyInterval) clearInterval(energyInterval);
  // Sync every 60s (2/3 of a regen tick) to stay in sync with server
  energyInterval = setInterval(() => {
    loadCharacter();
  }, 60000);
}

/**
 * Update the energy bar and countdown display.
 * @param {number} current - current energy value
 * @param {number} max - max energy
 * @param {number} nextTickSec - seconds until next +1 energy tick (server-derived)
 */
function updateEnergyBar(current, max, nextTickSec) {
  energyData = { current, max, nextTickSec };

  // Update text
  const energyEl = document.getElementById('char-energy');
  if (energyEl) energyEl.textContent = `${current} / ${max}`;

  // Update bar fill
  const barEl = document.getElementById('energy-bar');
  if (barEl) {
    const pct = Math.round((current / max) * 100);
    barEl.style.width = `${pct}%`;
    barEl.title = `${current}/${max} energy`;
  }

  // Update countdown
  const timerEl = document.getElementById('energy-timer');
  if (timerEl) {
    if (current >= max) {
      timerEl.textContent = 'Energy full';
    } else {
      const mins = Math.floor(nextTickSec / 60);
      const secs = nextTickSec % 60;
      timerEl.textContent = `Next +1 in ${mins}:${secs.toString().padStart(2, '0')}`;
    }
  }
}

/**
 * Start a client-side countdown that decrements until the next energy tick.
 * When it reaches zero, refetch from server to get authoritative state.
 */
function startCountdown() {
  if (!energyData || energyData.current >= energyData.max || energyData.nextTickSec <= 0) {
    return;
  }

  let remaining = energyData.nextTickSec;

  if (energyInterval) clearInterval(energyInterval);
  energyInterval = setInterval(() => {
    remaining--;
    if (remaining <= 0) {
      clearInterval(energyInterval);
      energyInterval = null;
      loadCharacter();
      return;
    }
    const mins = Math.floor(remaining / 60);
    const secs = remaining % 60;
    const timerEl = document.getElementById('energy-timer');
    if (timerEl) {
      timerEl.textContent = `Next +1 in ${mins}:${secs.toString().padStart(2, '0')}`;
    }
  }, 1000);
}

async function loadCharacter() {
  try {
    const data = await api.get('/character');
    if (!data) {
      // No character yet — redirect to create-hero
      window.location.href = '/create-hero.html';
      return;
    }

    const { character, derived, energy } = data;

    // Show stats, hide loading
    document.getElementById('hero-loading').style.display = 'none';
    document.getElementById('hero-stats').style.display = 'block';

    // Basic info
    document.getElementById('player-name').textContent = character.name;
    document.getElementById('char-name').textContent = character.name;
    document.getElementById('char-class').textContent = character.class.charAt(0).toUpperCase() + character.class.slice(1);
    document.getElementById('char-level').textContent = character.level;
    document.getElementById('char-hp').textContent = `${character.hp_current} / ${derived.maxHp}`;
    document.getElementById('char-energy').textContent = `${energy.current} / ${energy.max}`;
    document.getElementById('char-gold').textContent = character.gold;
    document.getElementById('char-xp').textContent = `${character.xp} / ${xpToNext(character.level)}`;
    document.getElementById('char-str').textContent = character.str;
    document.getElementById('char-agi').textContent = character.agi;
    document.getElementById('char-int').textContent = character.int;
    document.getElementById('char-vit').textContent = character.vit;
    document.getElementById('derived-atk').textContent = derived.attack;
    document.getElementById('derived-def').textContent = derived.defense;
    document.getElementById('derived-spd').textContent = derived.speed;
    document.getElementById('derived-crit').textContent = derived.critChance;

    // Update energy bar and start countdown
    updateEnergyBar(energy.current, energy.max, energy.nextTickInSec);
    startCountdown();
  } catch (err) {
    // Not authenticated — redirect to login
    window.location.href = '/login.html';
  }
}

function xpToNext(level) {
  return Math.floor(100 * Math.pow(level, 1.5));
}

// Start periodic energy sync from server (every 60s)
startEnergySync();

// Logout handler
document.getElementById('logout-btn')?.addEventListener('click', async (e) => {
  e.preventDefault();
  try {
    await api.post('/auth/logout', {});
  } catch (_) {}
  window.location.href = '/login.html';
});

document.addEventListener('DOMContentLoaded', loadCharacter);