/* ============================================================
   public/js/buildings/bazaar.js
============================================================ */

const BAZAAR_PER_PAGE = 18;
let baz_initialized = false;
let baz_page = 1;
let baz_wood = 0, baz_iron = 0, baz_gold = 0, baz_gems = 0;

const BAZ_SVG_RANGE = `<svg viewBox="0 0 16 16" width="10" height="10" style="display:inline;vertical-align:middle;flex-shrink:0" fill="none" stroke="#e8b84b" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M4 2 Q1 8 4 14"/><line x1="4" y1="2" x2="4" y2="14" stroke-width="0.7" stroke-dasharray="2,1.5"/><line x1="4" y1="8" x2="13" y2="8"/><polyline points="11,6 13,8 11,10"/><line x1="5" y1="7" x2="4" y2="8"/><line x1="5" y1="9" x2="4" y2="8"/></svg>`;
const BAZ_SVG_RACE  = `<svg viewBox="0 0 16 16" width="10" height="10" style="display:inline;vertical-align:middle;flex-shrink:0" fill="none" stroke="#7de87d" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><circle cx="9" cy="2.5" r="1.4" fill="#7de87d" stroke="none"/><line x1="9" y1="4" x2="8" y2="9"/><line x1="8" y1="9" x2="10" y2="14"/><line x1="8" y1="9" x2="6" y2="13"/><line x1="8.5" y1="5.5" x2="11" y2="8"/><line x1="8.5" y1="5.5" x2="6" y2="7"/></svg>`;

const RARITY_CRYSTALS = {
  1:"roter-cristal.png",2:"blauer-cristal.png",3:"gelber-cristal.png",
  4:"gruener-cristal.png",5:"oranger-cristal.png",6:"violet-cristal.png",7:"pinker-cristal.png"
};
function rarityImgs(rarity, size=11) {
  const file = RARITY_CRYSTALS[String(rarity)];
  if (!file) return "";
  const img = `<img src="/images/items/${file}" alt="${rarity}" style="width:${size}px;height:${size}px;object-fit:contain;filter:drop-shadow(0 1px 2px rgba(0,0,0,0.8));">`;
  return img.repeat(parseInt(rarity)||0);
}

function loadCSS() {
  if (!document.querySelector('link[href="/css/bazaar.css"]')) {
    const l = document.createElement("link");
    l.rel = "stylesheet"; l.href = "/css/bazaar.css";
    document.head.appendChild(l);
  }
}

function ensurePopup() {
  if (document.getElementById("bazaar-popup")) return;
  const popup = document.createElement("div");
  popup.id = "bazaar-popup";
  popup.className = "qm-popup";
  popup.innerHTML = `
    <div class="qm-popup-header">
      <span class="qm-popup-title">Bazaar</span>
      <div class="baz-header-right">
        <span class="baz-currency">🪵 <span id="baz-wood">–</span></span>
        <span class="baz-currency">⚙️ <span id="baz-iron">–</span></span>
        <span class="baz-currency">🪙 <span id="baz-gold">–</span></span>
        <span class="baz-currency">💎 <span id="baz-gems">–</span></span>
        <span class="qm-popup-close" id="bazaar-close">✕</span>
      </div>
    </div>
    <div class="mp-body-wrap">
      <aside class="mp-tabs" id="baz-tabs">
        <button class="mp-tab mp-tab-active" data-tab="baz-panel-1">
          <span class="mp-tab-dot"></span><span>Händler</span>
        </button>
        <button class="mp-tab" data-tab="baz-panel-2">
          <span class="mp-tab-dot"></span><span>Auktionen</span>
        </button>
        <button class="mp-tab" data-tab="baz-panel-3">
          <span class="mp-tab-dot"></span><span>Tauschbörse</span>
        </button>
      </aside>
      <div class="mp-content">
        <div class="mp-panel active" id="baz-panel-1">
          <div class="mp-col-header">Händler</div>
          <div class="baz-grid" id="baz-grid"><div class="baz-loading">Lade Karten…</div></div>
          <div class="baz-pagination" id="baz-pagination"></div>
        </div>
        <div class="mp-panel" id="baz-panel-2">
          <div class="mp-col-header">Auktionen</div>
          <div class="mp-panel-body"><span class="mp-coming-soon">Demnächst verfügbar…</span></div>
        </div>
        <div class="mp-panel" id="baz-panel-3">
          <div class="mp-col-header">Tauschbörse</div>
          <div class="mp-panel-body"><span class="mp-coming-soon">Demnächst verfügbar…</span></div>
        </div>
      </div>
    </div>`;
  document.body.appendChild(popup);

  popup.querySelector("#bazaar-close").addEventListener("click", closeBazaar);

  popup.querySelectorAll(".mp-tab").forEach((btn) => {
    btn.addEventListener("click", () => {
      popup.querySelectorAll(".mp-tab").forEach(t => t.classList.remove("mp-tab-active"));
      popup.querySelectorAll(".mp-panel").forEach(p => p.classList.remove("active"));
      btn.classList.add("mp-tab-active");
      document.getElementById(btn.dataset.tab)?.classList.add("active");
    });
  });

  /* Drag */
  const header = popup.querySelector(".qm-popup-header");
  let dragging=false, sx,sy,sl,st;
  header.style.cursor="grab";
  header.addEventListener("mousedown",(e)=>{
    if(e.target.classList.contains("qm-popup-close"))return;
    dragging=true; header.style.cursor="grabbing";
    const r=popup.getBoundingClientRect();
    sx=e.clientX;sy=e.clientY;sl=r.left;st=r.top;
    popup.style.transform="none";
    popup.style.left=sl+"px";popup.style.top=st+"px";
    e.preventDefault();
  });
  document.addEventListener("mousemove",(e)=>{
    if(!dragging)return;
    popup.style.left=(sl+(e.clientX-sx))+"px";
    popup.style.top=(st+(e.clientY-sy))+"px";
  });
  document.addEventListener("mouseup",()=>{dragging=false;header.style.cursor="grab";});
}

function updateCurrencyDisplay() {
  const fmt = n => n.toLocaleString("de-DE");
  const w=document.getElementById("baz-wood");   if(w) w.textContent=fmt(baz_wood);
  const i=document.getElementById("baz-iron");   if(i) i.textContent=fmt(baz_iron);
  const g=document.getElementById("baz-gold");   if(g) g.textContent=fmt(baz_gold);
  const d=document.getElementById("baz-gems");   if(d) d.textContent=fmt(baz_gems);
}

async function loadShopCards() {
  const grid       = document.getElementById("baz-grid");
  const pagination = document.getElementById("baz-pagination");
  if (!grid) return;
  grid.innerHTML = `<div class="baz-loading">Lade Karten…</div>`;
  if (pagination) pagination.innerHTML = "";

  try {
    const res  = await fetch(`/api/bazaar/cards?page=${baz_page}&limit=${BAZAAR_PER_PAGE}`);
    if (!res.ok) throw new Error(res.status);
    const data = await res.json();

    baz_wood=data.wood; baz_iron=data.iron; baz_gold=data.gold; baz_gems=data.gems;
    updateCurrencyDisplay();

    if (!data.cards.length) {
      grid.innerHTML = `<div class="baz-empty">Keine Karten verfügbar.</div>`;
      return;
    }

    grid.innerHTML = data.cards.map((c) => {
      const prices = [
        c.price_wood > 0 ? `<span class="baz-price-wood">🪵 ${c.price_wood}</span>`   : "",
        c.price_iron > 0 ? `<span class="baz-price-iron">⚙️ ${c.price_iron}</span>`   : "",
        c.price_gold > 0 ? `<span class="baz-price-gold">🪙 ${c.price_gold}</span>`   : "",
        c.price_gems > 0 ? `<span class="baz-price-gems">💎 ${c.price_gems}</span>`   : "",
      ].filter(Boolean).join("");

      return `
      <div class="baz-card" data-card-id="${c.id}" title="${c.name}">
        <div class="baz-card-img">
        <img src="/images/cards/${c.image}" alt="${c.name}"
             onerror="this.src='/images/avatar_placeholder.svg'">
        ${c.attack  != null ? `<span class="baz-stat-atk">${c.attack}</span>`  : ""}
        ${c.defends != null ? `<span class="baz-stat-def">${c.defends}</span>` : ""}
        ${c.cooldown != null ? `<span class="baz-stat-cd">${c.cooldown}</span>` : ""}
        ${c.rarity ? `<div class="baz-rarity">${rarityImgs(c.rarity,11)}</div>` : ""}
        ${(c.range != null || c.race != null) ? `
        <div class="baz-range-race">
          ${c.range != null ? `<span class="baz-badge-range">${BAZ_SVG_RANGE}&thinsp;${c.range}</span>` : ""}
          ${c.race  != null ? `<span class="baz-badge-race">${BAZ_SVG_RACE}&thinsp;${c.race}</span>`   : ""}
        </div>` : ""}
        </div>
        <div class="baz-price">${prices || "<span style='color:#8b6a3c;font-size:8px;'>Kostenlos</span>"}</div>
      </div>`;
    }).join("");

    grid.querySelectorAll(".baz-card").forEach((el) => {
      el.addEventListener("click", () => {
        const card = data.cards.find(c => c.id === parseInt(el.dataset.cardId));
        if (card) showBuyConfirm(card);
      });
    });

    renderPagination(pagination, data.totalPages, data.total);
  } catch (err) {
    grid.innerHTML = `<div class="baz-empty">Fehler beim Laden.</div>`;
    console.error("[bazaar]", err);
  }
}

function showBuyConfirm(card) {
  document.getElementById("baz-confirm-modal")?.remove();

  const maxAffordable = Math.max(1, Math.min(99,
    card.price_wood > 0 ? Math.floor(baz_wood / card.price_wood) : 99,
    card.price_iron > 0 ? Math.floor(baz_iron / card.price_iron) : 99,
    card.price_gold > 0 ? Math.floor(baz_gold / card.price_gold) : 99,
    card.price_gems > 0 ? Math.floor(baz_gems / card.price_gems) : 99,
  ));

  function calcTotal(qty) {
    return {
      wood: card.price_wood * qty,
      iron: card.price_iron * qty,
      gold: card.price_gold * qty,
      gems: card.price_gems * qty,
    };
  }

  function priceHtml(qty) {
    const t = calcTotal(qty);
    return [
      t.wood > 0 ? `<span class="baz-price-wood">🪵 ${t.wood}</span>` : "",
      t.iron > 0 ? `<span class="baz-price-iron">⚙️ ${t.iron}</span>` : "",
      t.gold > 0 ? `<span class="baz-price-gold">🪙 ${t.gold}</span>` : "",
      t.gems > 0 ? `<span class="baz-price-gems">💎 ${t.gems}</span>` : "",
    ].filter(Boolean).join(" ");
  }

  function canAffordQty(qty) {
    const t = calcTotal(qty);
    return baz_wood >= t.wood && baz_iron >= t.iron &&
           baz_gold >= t.gold && baz_gems >= t.gems;
  }

  const modal = document.createElement("div");
  modal.id = "baz-confirm-modal";
  modal.innerHTML = `
    <div class="baz-confirm-backdrop"></div>
    <div class="baz-confirm-box">
      <div class="baz-confirm-img-wrap">
        <img src="/images/cards/${card.image}" alt="${card.name}"
             onerror="this.src='/images/avatar_placeholder.svg'">
      </div>
      <div class="baz-confirm-name">${card.name}</div>
      <div class="baz-qty-wrap">
        <button class="baz-qty-btn" id="baz-qty-minus">−</button>
        <input class="baz-qty-input" id="baz-qty" type="number"
               min="1" max="99" value="1">
        <button class="baz-qty-btn" id="baz-qty-plus">+</button>
        <button class="baz-qty-max" id="baz-qty-max">MAX</button>
      </div>
      <div class="baz-confirm-price" id="baz-total-price">${priceHtml(1) || "Kostenlos"}</div>
      <div class="baz-confirm-warn" id="baz-afford-warn" style="display:none">⚠ Nicht genug Ressourcen</div>
      <div class="baz-confirm-btns">
        <button class="baz-btn-cancel" id="baz-cancel">Abbrechen</button>
        <button class="baz-btn-buy" id="baz-confirm">Kaufen</button>
      </div>
    </div>`;
  document.getElementById("bazaar-popup").appendChild(modal);

  const qtyInput = modal.querySelector("#baz-qty");
  const priceEl  = modal.querySelector("#baz-total-price");
  const warnEl   = modal.querySelector("#baz-afford-warn");
  const buyBtn   = modal.querySelector("#baz-confirm");

  function updateModal() {
    const qty = Math.max(1, Math.min(99, parseInt(qtyInput.value) || 1));
    qtyInput.value = qty;
    priceEl.innerHTML = priceHtml(qty) || "Kostenlos";
    const ok = canAffordQty(qty);
    warnEl.style.display = ok ? "none" : "";
    buyBtn.disabled = !ok;
  }

  qtyInput.addEventListener("input", updateModal);
  modal.querySelector("#baz-qty-minus").onclick = () => {
    qtyInput.value = Math.max(1, parseInt(qtyInput.value || 1) - 1); updateModal();
  };
  modal.querySelector("#baz-qty-plus").onclick = () => {
    qtyInput.value = Math.min(99, parseInt(qtyInput.value || 1) + 1); updateModal();
  };
  modal.querySelector("#baz-qty-max").onclick = () => {
    qtyInput.value = maxAffordable; updateModal();
  };

  updateModal();

  modal.querySelector("#baz-cancel").onclick = () => modal.remove();
  modal.querySelector(".baz-confirm-backdrop").onclick = () => modal.remove();

  buyBtn.onclick = async () => {
    const qty = Math.max(1, Math.min(99, parseInt(qtyInput.value) || 1));
    buyBtn.disabled = true; buyBtn.textContent = "…";
    try {
      const res  = await fetch("/api/bazaar/buy", {
        method:"POST", headers:{"Content-Type":"application/json"},
        body: JSON.stringify({ card_id: card.id, quantity: qty }),
      });
      const data = await res.json();
      if (!res.ok) { buyBtn.textContent = data.error||"Fehler"; setTimeout(()=>modal.remove(),2000); return; }
      baz_wood=data.wood; baz_iron=data.iron; baz_gold=data.gold; baz_gems=data.gems;
      updateCurrencyDisplay();
      modal.remove();
      showToast(`✅ ${qty}× ${card.name} gekauft!`);
      await loadShopCards();
    } catch { buyBtn.textContent="Fehler"; setTimeout(()=>modal.remove(),2000); }
  };
}

function renderPagination(el, totalPages, total) {
  if (!el||!totalPages||totalPages<=1) return;
  el.innerHTML = `
    <button class="baz-page-btn" id="baz-prev" ${baz_page===1?"disabled":""}>◀</button>
    ${Array.from({length:totalPages},(_,i)=>i+1).map(p=>
      `<button class="baz-page-btn ${p===baz_page?"baz-page-active":""}" data-page="${p}">${p}</button>`
    ).join("")}
    <button class="baz-page-btn" id="baz-next" ${baz_page===totalPages?"disabled":""}>▶</button>
    <span class="baz-page-info">${total} Karten</span>`;
  el.querySelector("#baz-prev")?.addEventListener("click",async()=>{if(baz_page>1){baz_page--;await loadShopCards();}});
  el.querySelector("#baz-next")?.addEventListener("click",async()=>{if(baz_page<totalPages){baz_page++;await loadShopCards();}});
  el.querySelectorAll("[data-page]").forEach(btn=>btn.addEventListener("click",async()=>{baz_page=parseInt(btn.dataset.page);await loadShopCards();}));
}

function showToast(msg) {
  const t=document.createElement("div"); t.className="baz-toast"; t.textContent=msg;
  document.body.appendChild(t); setTimeout(()=>t.remove(),2800);
}

function closeBazaar() {
  document.getElementById("bazaar-popup")?.classList.remove("active");
  document.getElementById("qm-overlay")?.classList.remove("active");
}

export function loadBazaar() {
  loadCSS();
  ensurePopup();
  const popup=document.getElementById("bazaar-popup");
  const overlay=document.getElementById("qm-overlay");
  popup.style.left="50%"; popup.style.top="50%";
  popup.style.transform="translate(-50%, -50%) scale(1)";
  popup.classList.add("active");
  overlay?.classList.add("active");
  if (!baz_initialized) { baz_initialized=true; baz_page=1; loadShopCards(); }
}