/**
 * plugin-ui.js  –  Layer-Steuerung (ein-/ausblenden)
 * ====================================================
 * Abhängigkeit: earth-core.js
 */

(function () {

  const LAYERS = [
    { name: "Nacht & Dämmerung", canvasIds: ["nightCanvas", "terminatorCanvas"], defaultOn: true },
    { name: "Wolken",            canvasIds: ["cloudCanvas"],                      defaultOn: false },
    { name: "Aurora",            canvasIds: ["auroraCanvas"],                     defaultOn: false },
    { name: "Satelliten",        canvasIds: ["orbitCanvas"],                      defaultOn: true },
    { name: "Sonne",             canvasIds: ["sunCanvas"],                        defaultOn: true },
    { name: "Mond",              canvasIds: ["moonCanvas"],                       defaultOn: true },
    { name: "Erdbeben",          canvasIds: ["earthquakeCanvas"],                 defaultOn: false },
    { name: "Ortsmarker",        canvasIds: ["markersCanvas"],                    defaultOn: false },
  ];

  const CFG = {
    TITLE:       "Layer",
    ACCENT:      "#4a9eff",
    ACCENT_OFF:  "rgba(50, 60, 90, 0.9)",
  };

  // ── pendingVisibility und setVisibility VOR dem UI-Aufbau ──────
  const pendingVisibility = new Map();

  function setVisibility(layer, on) {
    layer.canvasIds.forEach(id => {
      const el = document.getElementById(id);
      if (el) {
        el.style.display = on ? "block" : "none";
      } else {
        pendingVisibility.set(id, on);
      }
    });
  }

  const observer = new MutationObserver(mutations => {
    for (const mut of mutations) {
      for (const node of mut.addedNodes) {
        if (node.id && pendingVisibility.has(node.id)) {
          node.style.display = pendingVisibility.get(node.id) ? "block" : "none";
          pendingVisibility.delete(node.id);
        }
      }
    }
    if (pendingVisibility.size === 0) observer.disconnect();
  });
  observer.observe(document.getElementById("earth-wrapper") || document.body, {
    childList: true, subtree: true,
  });

  // ── CSS ────────────────────────────────────────────────────────
  const style = document.createElement("style");
  style.textContent = `
    #earth-ui {
      position: absolute; bottom: 14px; left: 14px; z-index: 9999;
      background: rgba(6, 10, 22, 0.78);
      border: 1px solid rgba(80, 110, 190, 0.28);
      border-radius: 8px; padding: 7px 10px;
      font: 11px/1.4 system-ui, -apple-system, sans-serif;
      color: rgba(190, 210, 255, 0.88);
      user-select: none; min-width: 140px;
      backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
      box-shadow: 0 2px 16px rgba(0,0,0,0.5);
      opacity: 0.75; transition: opacity 0.2s;
    }
    #earth-ui:hover { opacity: 1; }

    #earth-ui-header {
      display: flex; align-items: center; justify-content: space-between;
      margin-bottom: 6px; cursor: pointer; gap: 8px;
    }
    #earth-ui-title {
      font-weight: 600; font-size: 10px;
      letter-spacing: 0.1em; text-transform: uppercase;
      color: rgba(140, 170, 255, 0.75);
    }
    #earth-ui-chevron {
      font-size: 8px; color: rgba(100, 120, 180, 0.6);
      transition: transform 0.2s;
    }
    #earth-ui-chevron.collapsed { transform: rotate(-90deg); }

    #earth-ui-rows {
      display: flex; flex-direction: column; gap: 4px;
      overflow: hidden; max-height: 300px; opacity: 1;
      transition: max-height 0.2s ease, opacity 0.15s;
    }
    #earth-ui-rows.collapsed { max-height: 0; opacity: 0; }

    .earth-ui-row {
      display: flex; align-items: center;
      justify-content: space-between; gap: 8px;
    }
    .earth-ui-label {
      font-size: 11px; color: rgba(190, 210, 255, 0.85);
      transition: color 0.15s; flex: 1; cursor: pointer;
    }
    .earth-ui-label:hover { color: #fff; }
    .earth-ui-label.off   { color: rgba(100, 115, 155, 0.65); }

    /* Schmaler Toggle: 28×15px */
    .earth-ui-toggle { position: relative; width: 28px; height: 15px; flex-shrink: 0; }
    .earth-ui-toggle input { opacity: 0; width: 0; height: 0; position: absolute; }
    .earth-ui-slider {
      position: absolute; inset: 0; border-radius: 15px;
      background: ${CFG.ACCENT_OFF}; transition: background 0.18s; cursor: pointer;
    }
    .earth-ui-slider::before {
      content: ""; position: absolute;
      width: 10px; height: 10px; left: 2.5px; top: 50%;
      transform: translateY(-50%); border-radius: 50%;
      background: rgba(160, 175, 210, 0.8);
      transition: left 0.18s, background 0.18s;
    }
    .earth-ui-toggle input:checked + .earth-ui-slider { background: ${CFG.ACCENT}; }
    .earth-ui-toggle input:checked + .earth-ui-slider::before {
      left: 15.5px; background: #fff;
    }
  `;
  document.head.appendChild(style);

  // ── Panel ──────────────────────────────────────────────────────
  const panel = document.createElement("div");
  panel.id = "earth-ui";

  const header = document.createElement("div");
  header.id = "earth-ui-header";
  header.innerHTML = `
    <span id="earth-ui-title">${CFG.TITLE}</span>
    <span id="earth-ui-chevron">▼</span>
  `;
  panel.appendChild(header);

  const rows = document.createElement("div");
  rows.id = "earth-ui-rows";
  panel.appendChild(rows);

  let collapsed = false;
  header.addEventListener("click", () => {
    collapsed = !collapsed;
    rows.classList.toggle("collapsed", collapsed);
    document.getElementById("earth-ui-chevron").classList.toggle("collapsed", collapsed);
  });

  // ── Rows ───────────────────────────────────────────────────────
  LAYERS.forEach(layer => {
    const row = document.createElement("div");
    row.className = "earth-ui-row";

    const label = document.createElement("span");
    label.className = "earth-ui-label";
    label.textContent = layer.name;

    const toggleWrap = document.createElement("label");
    toggleWrap.className = "earth-ui-toggle";

    const checkbox = document.createElement("input");
    checkbox.type    = "checkbox";
    checkbox.checked = layer.defaultOn;

    const slider = document.createElement("span");
    slider.className = "earth-ui-slider";

    toggleWrap.appendChild(checkbox);
    toggleWrap.appendChild(slider);
    row.appendChild(label);
    row.appendChild(toggleWrap);
    rows.appendChild(row);

    setVisibility(layer, layer.defaultOn);
    if (!layer.defaultOn) label.classList.add("off");

    checkbox.addEventListener("change", () => {
      setVisibility(layer, checkbox.checked);
      label.classList.toggle("off", !checkbox.checked);
    });

    label.addEventListener("click", () => {
      checkbox.checked = !checkbox.checked;
      checkbox.dispatchEvent(new Event("change"));
    });
  });

  (document.getElementById("earth-wrapper") || document.body).appendChild(panel);

}());