// Hotbar UI — 3-slot Minecraft-style bottom bar + selected item indicator
import { state } from '../core/state.js';
import { BLOCKS } from '../data/blocks.js';
import { ITEMS } from '../data/items.js';
import { TOOLS } from '../data/tools.js';
import { tex, itemTex } from '../render/textures.js';
import { playSound } from '../audio/sound-engine.js';

const HOTBAR_SLOTS = 3;

let selectedItemEl = null;

export function addToRecentItems(id) {
  if (!id) return;
  state.recentItems = state.recentItems.filter(item => item !== id);
  state.recentItems.unshift(id);
  state.recentItems = state.recentItems.slice(0, 5);
}

function renderSlotIcon(el, id) {
  if (BLOCKS[id] && tex[id]) {
    el.style.backgroundImage = `url(${tex[id].toDataURL()})`;
    el.style.backgroundSize = 'cover';
  } else if (itemTex[id]) {
    el.style.backgroundImage = `url(${itemTex[id].toDataURL()})`;
    el.style.backgroundSize = 'cover';
  } else if (ITEMS[id]) {
    el.textContent = ITEMS[id].icon || '📦';
  } else if (TOOLS[id]) {
    el.textContent = TOOLS[id].icon || '🔧';
  } else if (id === 'iron_armor') {
    el.textContent = '🛡️';
    el.style.background = 'linear-gradient(135deg, #95a5a6 0%, #7f8c8d 100%)';
  } else {
    el.textContent = id.charAt(0).toUpperCase();
    el.style.background = '#555';
    el.style.color = '#fff';
    el.style.fontWeight = '700';
    el.style.fontSize = '14px';
  }
}

function updateSelectedItem() {
  if (!selectedItemEl) selectedItemEl = document.getElementById('selectedItem');
  if (!selectedItemEl) return;
  const sel = state.selected;
  if (!sel || !state.inv[sel] || state.inv[sel] <= 0) {
    selectedItemEl.style.display = 'none';
    return;
  }
  selectedItemEl.style.display = 'flex';
  // Clear previous content
  selectedItemEl.textContent = '';
  selectedItemEl.style.backgroundImage = '';
  selectedItemEl.style.background = 'rgba(0,0,0,0.45)';
  // Render icon
  if (BLOCKS[sel] && tex[sel]) {
    selectedItemEl.style.backgroundImage = `url(${tex[sel].toDataURL()})`;
    selectedItemEl.style.backgroundSize = 'cover';
  } else if (itemTex[sel]) {
    selectedItemEl.style.backgroundImage = `url(${itemTex[sel].toDataURL()})`;
    selectedItemEl.style.backgroundSize = 'cover';
  } else if (ITEMS[sel]) {
    selectedItemEl.textContent = ITEMS[sel].icon || '📦';
  } else if (TOOLS[sel]) {
    selectedItemEl.textContent = TOOLS[sel].icon || '🔧';
  } else {
    selectedItemEl.textContent = sel.charAt(0).toUpperCase();
  }
}

export function rebuildHotbar() {
  const hotbarEl = state.hotbarEl;
  const inv = state.inv;
  const selected = state.selected;
  const toolDurability = state.toolDurability;

  hotbarEl.innerHTML = '';

  // Get up to 3 recent items with count > 0
  const items = state.recentItems.filter(id => inv[id] > 0).slice(0, HOTBAR_SLOTS);

  // If selected item not in list and has count > 0, push to front
  if (inv[selected] > 0 && !items.includes(selected)) {
    items.unshift(selected);
    if (items.length > HOTBAR_SLOTS) items.pop();
  }

  // Always render HOTBAR_SLOTS slots (fill empties)
  for (let si = 0; si < HOTBAR_SLOTS; si++) {
    const id = items[si] || null;
    const s = document.createElement('div');
    s.className = 'slot' + (id && id === selected ? ' sel' : '');

    // Slot number indicator (top-left)
    const numEl = document.createElement('div');
    numEl.style.cssText = 'position:absolute;top:1px;left:3px;font-size:10px;color:rgba(255,255,255,0.55);font-weight:700;pointer-events:none;text-shadow:1px 1px 1px rgba(0,0,0,0.7);';
    numEl.textContent = (si + 1).toString();
    s.appendChild(numEl);

    if (id) {
      renderSlotIcon(s, id);

      const c = document.createElement('div');
      c.className = 'count';
      c.textContent = inv[id];
      s.appendChild(c);
      s.onclick = () => {
        playSound('click');
        state.selected = id;
        // Move to front of recentItems
        state.recentItems = state.recentItems.filter(item => item !== id);
        state.recentItems.unshift(id);
        rebuildHotbar();
      };

      if (id === 'iron_armor' && state.player.equippedArmor === 'iron_armor') {
        const equipped = document.createElement('div');
        equipped.className = 'equipped-indicator';
        equipped.textContent = '✓';
        s.appendChild(equipped);
      }

      // Durability bar
      if (TOOLS[id] && inv[id] > 0) {
        let curDur = 0, maxDur = TOOLS[id].durability;
        for (const [tid, dur] of toolDurability) {
          if (dur.type === id) {
            curDur = dur.current;
            maxDur = dur.max;
            break;
          }
        }
        if (maxDur > 0) {
          const bar = document.createElement('div');
          bar.style.cssText = `position:absolute;bottom:0;left:0;right:0;height:3px;background:#333;border-radius:0 0 6px 6px;overflow:hidden;`;
          const fill = document.createElement('div');
          const pct = curDur / maxDur;
          const color = pct > 0.5 ? '#2ecc71' : pct > 0.25 ? '#f39c12' : '#e74c3c';
          fill.style.cssText = `width:${pct * 100}%;height:100%;background:${color};`;
          bar.appendChild(fill);
          s.appendChild(bar);
        }
      }
    }
    hotbarEl.appendChild(s);
  }

  // Update selected item indicator above hotbar
  updateSelectedItem();
}