/* Trilogy Hub — Bild-Positions-Editor (gleicher Rahmen wie Slot-Anzeige) */
(() => {
  "use strict";

  function computeLayout(imgW, imgH, frameW, frameH, focus, zoom) {
    const fx = focus?.x ?? 0.5;
    const fy = focus?.y ?? 0.5;
    const z = Math.max(1, zoom ?? 1);
    const cover = Math.max(frameW / imgW, frameH / imgH);
    const scale = cover * z;
    const w = imgW * scale;
    const h = imgH * scale;
    let left = frameW / 2 - fx * w;
    let top = frameH / 2 - fy * h;
    left = Math.min(0, Math.max(frameW - w, left));
    top = Math.min(0, Math.max(frameH - h, top));
    return { width: w, height: h, left, top };
  }

  function focusFromLayout(imgW, imgH, frameW, frameH, layout, zoom) {
    const z = Math.max(1, zoom ?? 1);
    const cover = Math.max(frameW / imgW, frameH / imgH);
    const w = imgW * cover * z;
    const h = imgH * cover * z;
    return {
      x: Math.min(1, Math.max(0, (frameW / 2 - layout.left) / w)),
      y: Math.min(1, Math.max(0, (frameH / 2 - layout.top) / h)),
    };
  }

  function applyLayout(img, layout) {
    img.style.width = layout.width + "px";
    img.style.height = layout.height + "px";
    img.style.left = layout.left + "px";
    img.style.top = layout.top + "px";
  }

  function loadImage(src) {
    return new Promise((resolve, reject) => {
      const img = new Image();
      img.onload = () => resolve(img);
      img.onerror = () => reject(new Error("Bild konnte nicht geladen werden"));
      img.src = src;
    });
  }

  function slotFrameSize(slot) {
    const cs = getComputedStyle(slot);
    let w = slot.offsetWidth;
    let h = slot.offsetHeight;
    if (w < 40) w = slot.parentElement?.offsetWidth || 320;
    if (h < 40) {
      const mh = cs.minHeight;
      h = mh && mh !== "0px" ? parseFloat(mh) : 220;
    }
    const isHero = slot.classList.contains("!rounded-none") || slot.closest(".min-h-\\[72vh\\]");
    const maxPreview = isHero ? 400 : 300;
    const ar = w / h;
    if (w > maxPreview) { w = maxPreview; h = w / ar; }
    return { width: Math.round(w), height: Math.round(h), radius: cs.borderRadius, label: slot.dataset.slot || "Bild" };
  }

  async function open({ file, slot, focus, zoom, imageSrc }) {
    let src = imageSrc;
    let revoke = null;
    if (file) { src = URL.createObjectURL(file); revoke = src; }

    const frame = slotFrameSize(slot);
    let img;
    try { img = await loadImage(src); }
    catch (e) { if (revoke) URL.revokeObjectURL(revoke); throw e; }

    const state = {
      focus: { x: focus?.x ?? 0.5, y: focus?.y ?? 0.5 },
      zoom: Math.max(1, zoom ?? 1),
      dragging: false, lastX: 0, lastY: 0, pinchDist: 0, pinchZoom: 1,
    };

    return new Promise((resolve) => {
      const backdrop = document.createElement("div");
      backdrop.className = "img-editor-backdrop";
      backdrop.innerHTML = `
        <div class="img-editor-modal card card-gold">
          <div class="img-editor-head">
            <h2 class="font-display font-bold text-xl">${frame.label} positionieren</h2>
            <button type="button" class="btn btn-ghost !min-h-0 !p-2.5 img-editor-close" aria-label="Schließen">✕</button>
          </div>
          <p class="text-dim text-sm text-center mb-5">So wird das Bild im Rahmen angezeigt — ziehen &amp; zoomen</p>
          <div class="img-editor-preview-outer">
            <div class="img-editor-preview" id="ieFrame" style="width:${frame.width}px;height:${frame.height}px;border-radius:${frame.radius}">
              <img id="ieImg" src="${src}" alt="" draggable="false" />
            </div>
          </div>
          <label class="block text-sm font-semibold mb-2 mt-5">Zoom <span id="ieZoomVal">${state.zoom.toFixed(1)}×</span></label>
          <input type="range" id="ieZoom" class="img-editor-range" min="1" max="4" step="0.05" value="${state.zoom}" />
          <div class="flex gap-3 mt-6">
            <button type="button" class="btn btn-ghost flex-1" data-act="reset">Zurücksetzen</button>
            <button type="button" class="btn btn-primary flex-1" data-act="save">Speichern</button>
          </div>
        </div>`;

      document.body.appendChild(backdrop);
      document.body.style.overflow = "hidden";

      const frameEl = backdrop.querySelector("#ieFrame");
      const imgEl = backdrop.querySelector("#ieImg");
      const zoomInput = backdrop.querySelector("#ieZoom");
      const zoomVal = backdrop.querySelector("#ieZoomVal");
      let layout = { left: 0, top: 0, width: 0, height: 0 };

      const fw = () => frameEl.clientWidth;
      const fh = () => frameEl.clientHeight;

      function syncFromFocus() {
        layout = computeLayout(img.naturalWidth, img.naturalHeight, fw(), fh(), state.focus, state.zoom);
        applyLayout(imgEl, layout);
      }
      function syncFocusFromLayout() {
        state.focus = focusFromLayout(img.naturalWidth, img.naturalHeight, fw(), fh(), layout, state.zoom);
      }
      function finish(result) {
        document.body.style.overflow = "";
        backdrop.remove();
        if (revoke) URL.revokeObjectURL(revoke);
        resolve(result);
      }
      function setZoom(z) {
        const old = { ...layout };
        state.zoom = Math.min(4, Math.max(1, z));
        layout = computeLayout(img.naturalWidth, img.naturalHeight, fw(), fh(), state.focus, state.zoom);
        const cx = fw() / 2, cy = fh() / 2;
        const rx = (cx - old.left) / old.width;
        const ry = (cy - old.top) / old.height;
        layout.left = cx - rx * layout.width;
        layout.top = cy - ry * layout.height;
        layout.left = Math.min(0, Math.max(fw() - layout.width, layout.left));
        layout.top = Math.min(0, Math.max(fh() - layout.height, layout.top));
        syncFocusFromLayout();
        applyLayout(imgEl, layout);
        zoomInput.value = state.zoom;
        zoomVal.textContent = state.zoom.toFixed(1) + "×";
      }

      imgEl.addEventListener("load", syncFromFocus, { once: true });
      if (imgEl.complete) syncFromFocus();

      frameEl.addEventListener("pointerdown", (e) => {
        if (e.target.closest("button, input")) return;
        state.dragging = true;
        state.lastX = e.clientX;
        state.lastY = e.clientY;
        frameEl.setPointerCapture(e.pointerId);
        e.preventDefault();
      });
      frameEl.addEventListener("pointermove", (e) => {
        if (!state.dragging) return;
        layout.left = Math.min(0, Math.max(fw() - layout.width, layout.left + e.clientX - state.lastX));
        layout.top = Math.min(0, Math.max(fh() - layout.height, layout.top + e.clientY - state.lastY));
        state.lastX = e.clientX;
        state.lastY = e.clientY;
        applyLayout(imgEl, layout);
        syncFocusFromLayout();
      });
      frameEl.addEventListener("pointerup", () => { state.dragging = false; });
      frameEl.addEventListener("pointercancel", () => { state.dragging = false; });
      frameEl.addEventListener("wheel", (e) => { e.preventDefault(); setZoom(state.zoom + (e.deltaY > 0 ? -0.08 : 0.08)); }, { passive: false });
      frameEl.addEventListener("touchstart", (e) => {
        if (e.touches.length === 2) {
          state.pinchDist = Math.hypot(e.touches[0].clientX - e.touches[1].clientX, e.touches[0].clientY - e.touches[1].clientY);
          state.pinchZoom = state.zoom;
        }
      }, { passive: true });
      frameEl.addEventListener("touchmove", (e) => {
        if (e.touches.length === 2 && state.pinchDist > 0) {
          e.preventDefault();
          const dist = Math.hypot(e.touches[0].clientX - e.touches[1].clientX, e.touches[0].clientY - e.touches[1].clientY);
          setZoom(state.pinchZoom * (dist / state.pinchDist));
        }
      }, { passive: false });

      zoomInput.addEventListener("input", () => setZoom(+zoomInput.value));
      backdrop.addEventListener("click", (e) => { if (e.target === backdrop) finish(null); });
      backdrop.querySelector(".img-editor-close").onclick = () => finish(null);
      backdrop.querySelector('[data-act="reset"]').onclick = () => { state.focus = { x: 0.5, y: 0.5 }; state.zoom = 1; setZoom(1); };
      backdrop.querySelector('[data-act="save"]').onclick = () => { syncFocusFromLayout(); finish({ focus: { ...state.focus }, zoom: state.zoom }); };
    });
  }

  window.TrilogyImageEditor = { open, computeLayout, applyLayout };
})();