---
// 小平市の公園ポリゴン（OpenStreetMap）を地図上に色塗り表示する。
// 一覧と一致した公園は赤、一致しない公園は薄い赤で表示する。
---

<div class="park-map-wrap">
  <div
    id="park-map"
    class="park-map"
    role="region"
    aria-label="小平市の公園の位置（OpenStreetMap）"
  ></div>
  <div class="park-map-legend" aria-hidden="true">
    <span><i class="swatch swatch-matched"></i>一覧と一致</span>
    <span><i class="swatch swatch-unmatched"></i>一覧にない公園・緑地</span>
    <span><i class="swatch swatch-boundary"></i>小平市の境界</span>
    <span><i class="swatch-fac swatch-fac-toilet">WC</i>トイレ</span>
    <span><i class="swatch-fac swatch-fac-water"><svg viewBox="0 0 24 24" width="10" height="10" aria-hidden="true"><path fill="currentColor" d="M12 2.7c-3.4 4.2-6 8.1-6 11.3a6 6 0 0 0 12 0c0-3.2-2.6-7.1-6-11.3z" /></svg></i>水飲み場（拡大時）</span>
  </div>
  <p class="park-map-note">
    公園の範囲を赤で表示しています。地図を拡大すると見やすくなります。トイレと水飲み場のアイコンは、地図を拡大すると表示されます。OpenStreetMapに公園として登録されている範囲を表示しているため、すべての公園を網羅しているわけではありません。現在地は端末内でのみ利用し、サーバーには送信しません。地図データ © <a
      href="https://www.openstreetmap.org/copyright"
      target="_blank"
      rel="noopener">OpenStreetMap</a
    > contributors
  </p>
  <p class="park-map-locate-status" data-locate-status hidden></p>
</div>

<style>
  .park-map-wrap {
    position: relative;
    z-index: 11;
    margin: 1rem 0 1.5rem;
  }
  .park-map {
    height: 480px;
    width: 100%;
    border: 1px solid var(--sl-color-gray-5);
    border-radius: 8px;
  }
  .park-map-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 1rem;
    align-items: center;
    margin-top: 0.5rem;
    color: var(--sl-color-gray-2);
    font-size: 0.8rem;
  }
  .park-map-legend span {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
  }
  .swatch {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 2px;
  }
  .swatch-matched {
    background: #e53935;
  }
  .swatch-unmatched {
    background: #ffcdd2;
  }
  .swatch-boundary {
    height: 0;
    border-top: 4px solid #6a1b9a;
    border-radius: 0;
    background: transparent;
  }
  .park-map-locate-status {
    margin-top: 0.3rem;
    color: var(--sl-color-gray-2);
    font-size: 0.8rem;
  }
  :global(.park-locate) {
    width: 34px;
    height: 34px;
    border: 0;
    background: #fff;
    color: #1e88e5;
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
  }
  :global(.park-locate:hover) {
    background: #f0f7ff;
  }
  .park-map-note {
    margin-top: 0.4rem;
    color: var(--sl-color-gray-2);
    font-size: 0.8rem;
  }
  :global(.park-map-selected) {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.1rem 0.55rem;
    max-width: min(92vw, 340px);
    padding: 0.28rem 0.55rem;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--sl-color-gray-5);
    border-radius: 6px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.18);
    color: #1e293b;
    font-size: 0.8rem;
    line-height: 1.45;
  }
  :global(.park-map-selected[hidden]) {
    display: none;
  }
  :global(.park-map-selected-name) {
    font-weight: 700;
  }
  :global(.park-map-selected-owner) {
    padding: 0.02rem 0.3rem;
    border: 1px solid currentColor;
    border-radius: 999px;
    font-size: 0.68rem;
    font-weight: 600;
    opacity: 0.85;
  }
  :global(.park-map-selected-owner[hidden]) {
    display: none;
  }
  :global(.park-map-selected-note) {
    color: #666;
    font-size: 0.72rem;
  }
  :global(.park-map-selected a) {
    color: #0b57d0;
    white-space: nowrap;
  }
  .swatch-fac {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    margin-right: 0.3rem;
    color: #fff;
    font-style: normal;
    font-size: 7px;
    font-weight: 700;
    line-height: 1;
  }
  .swatch-fac-toilet {
    background: #455a64;
    border-radius: 4px;
  }
  .swatch-fac-water {
    background: #0277bd;
    border-radius: 50%;
  }
  :global(.park-fac-list) {
    display: inline-flex;
    gap: 2px;
    transform: translate(-50%, -50%);
  }
  :global(.park-fac) {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    color: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
    font-size: 9px;
    font-weight: 700;
    line-height: 1;
  }
  :global(.park-fac-toilet) {
    background: #455a64;
    border: 1px solid #263238;
    border-radius: 5px;
  }
  :global(.park-fac-water) {
    background: #0277bd;
    border: 1px solid #01579b;
    border-radius: 50%;
  }
  :global(.park-fac svg) {
    display: block;
  }
  /* StarlightのMarkdown余白ルールがLeafletの各ペインに margin-top:1rem を
     付けて地図を下へずらすため、地図内のペインは余白なしにする。 */
  .park-map :global(.leaflet-pane) {
    margin: 0 !important;
  }
  /* Starlightの canvas/svg 向け max-width が Leaflet の描画領域を
     0幅にしてしまうため、地図内だけ上書きする。 */
  .park-map :global(.leaflet-overlay-pane canvas),
  .park-map :global(.leaflet-overlay-pane svg) {
    max-width: none !important;
    max-height: none !important;
    margin: 0 !important;
  }
  /* Starlightの画像用 margin がタイルに付くと行が16pxずれるため、0にする。 */
  .park-map :global(.leaflet-tile) {
    margin: 0 !important;
  }
  @media (max-width: 640px) {
    .park-map {
      height: 360px;
    }
  }
</style>

<script>
  import L from "leaflet";
  import "leaflet/dist/leaflet.css";
  import geojson from "@/data/parks-geojson";
  import boundary from "@/data/kodaira-boundary.json";
  import parks from "@/data/kodaira-parks.json";

  const MATCHED_STYLE = {
    color: "#b71c1c",
    weight: 2,
    fillColor: "#e53935",
    fillOpacity: 0.45,
  };
  const UNMATCHED_STYLE = {
    color: "#ef5350",
    weight: 1.2,
    fillColor: "#ffcdd2",
    fillOpacity: 0.3,
  };
  const DIM_STYLE = {
    color: "#ef9a9a",
    weight: 0.8,
    fillColor: "#ffebee",
    fillOpacity: 0.05,
    opacity: 0.3,
  };
  const SELECTED_STYLE = {
    color: "#7f0000",
    weight: 3,
    fillColor: "#d32f2f",
    fillOpacity: 0.6,
  };

  const el = document.getElementById("park-map");
  if (el && !el.dataset.initialized) {
    el.dataset.initialized = "1";

    const map = L.map(el, {
      scrollWheelZoom: false,
      zoomSnap: 1,
      zoomDelta: 1,
      zoomAnimation: false,
      fadeAnimation: false,
      markerZoomAnimation: false,
    }).setView([35.728, 139.477], 13);

    // 帰属表示の「Leaflet」旗アイコンを消す（OSMの表示は残す）。
    map.attributionControl.setPrefix(false);

    const tileLayer = L.tileLayer("https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", {
      maxZoom: 19,
      attribution:
        '&copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors',
    }).addTo(map);

    const layersByName = new Map<string, any>();
    const allLayers: any[] = [];
    const parkDataByName = new Map<string, any>();
    (parks as any[]).forEach((p) => parkDataByName.set(p["公園名"], p));
    const ownerByName = new Map<string, string>();
    parkDataByName.forEach((p, name) => {
      const owner = (p["設置者"] || "").trim();
      if (owner && owner !== "小平市") ownerByName.set(name, owner);
    });
    const ownerLabel = (owner: string) =>
      owner.includes("都営")
        ? "都営"
        : owner === "東京都"
          ? "都立"
          : owner.includes("UR")
            ? "UR"
            : owner.includes("民間")
              ? "民間"
              : owner;

    const filterName = (name: string, scroll = false) => {
      document.dispatchEvent(
        new CustomEvent("park:filter-name", { detail: { name, scroll } }),
      );
    };

    // 選択中の公園を地図左下に控えめに表示する（ポップアップは使わない）。
    let selectedBar: HTMLElement | null = null;
    let selectedNameEl: HTMLElement | null = null;
    let selectedMapsLink: HTMLAnchorElement | null = null;
    let selectedTableLink: HTMLAnchorElement | null = null;
    let selectedNoteEl: HTMLElement | null = null;
    let selectedOwnerEl: HTMLElement | null = null;

    const showSelected = (
      ourName: string,
      osmName: string,
      listed = true,
      owner = "",
    ) => {
      if (!selectedBar || !selectedNameEl || !selectedMapsLink || !selectedTableLink)
        return;
      selectedNameEl.textContent = ourName;
      selectedNameEl.title =
        osmName && osmName !== ourName ? `OSM: ${osmName}` : "";
      // 名前が「緑地（OSM …）」のような場合は名前検索が使えないため、
      // 座標があれば緯度経度で開く。
      const rec = parkDataByName.get(ourName);
      const lat = rec?.["緯度"];
      const lng = rec?.["経度"];
      selectedMapsLink.href =
        lat && lng
          ? `https://www.google.com/maps/search/?api=1&query=${lat},${lng}`
          : "https://www.google.com/maps/search/?api=1&query=" +
            encodeURIComponent(`小平市${ourName}`);
      selectedTableLink.dataset.parkRow = encodeURIComponent(ourName);
      selectedTableLink.hidden = !listed;
      if (selectedNoteEl) selectedNoteEl.hidden = listed;
      if (selectedOwnerEl) {
        selectedOwnerEl.textContent = owner ? ownerLabel(owner) : "";
        selectedOwnerEl.hidden = !owner;
      }
      selectedBar.hidden = false;
    };

    const SelectedControl = L.Control.extend({
      onAdd: () => {
        const box = L.DomUtil.create("div", "park-map-selected");
        box.hidden = true;
        box.innerHTML =
          '<span class="park-map-selected-name"></span>' +
          '<span class="park-map-selected-owner" hidden></span>' +
          '<span class="park-map-selected-note" hidden>一覧にない緑地・公園</span>' +
          '<a data-park-maps-link href="#" target="_blank" rel="noopener">Googleマップ</a>' +
          '<a data-park-table-link href="#">一覧で見る</a>';
        selectedBar = box;
        selectedNameEl = box.querySelector<HTMLElement>(".park-map-selected-name");
        selectedMapsLink = box.querySelector<HTMLAnchorElement>("[data-park-maps-link]");
        selectedTableLink = box.querySelector<HTMLAnchorElement>("[data-park-table-link]");
        selectedNoteEl = box.querySelector<HTMLElement>(".park-map-selected-note");
        selectedOwnerEl = box.querySelector<HTMLElement>(".park-map-selected-owner");
        selectedTableLink?.addEventListener("click", (ev: Event) => {
          ev.preventDefault();
          const name = decodeURIComponent(
            (selectedTableLink as HTMLElement).dataset.parkRow || "",
          );
          if (name) filterName(name, true);
        });
        L.DomEvent.disableClickPropagation(box);
        return box;
      },
    });
    new SelectedControl({ position: "bottomleft" }).addTo(map);

    const layer = L.geoJSON(geojson as any, {
      style: (feature: any) =>
        feature?.properties?.matched ? MATCHED_STYLE : UNMATCHED_STYLE,
      onEachFeature: (feature: any, lyr: any) => {
        const p = feature.properties || {};
        const name = p.name || "名称未設定";
        const ourName = p.our_name || "";
        lyr._parkName = ourName;
        lyr._osmName = name;
        allLayers.push(lyr);
        if (ourName) layersByName.set(ourName, lyr);

        if (ourName) {
          lyr.on("add", () => {
            const path = lyr.getElement?.();
            if (path) path.setAttribute("data-park", ourName);
          });
          lyr.on("click", () => {
            filterName(ourName, false);
            showSelected(ourName, name, true, ownerByName.get(ourName) || "");
          });
        } else if (p.name) {
          // 一覧にないOSM上の公園・緑地。名前があればバーに表示する。
          lyr.on("click", () => showSelected(name, name, false));
        } else {
          // 名前のない緑地はクリックに反応させない。
          lyr.on("add", () => {
            const path = lyr.getElement?.();
            if (path) path.classList.remove("leaflet-interactive");
          });
        }
      },
    }).addTo(map);

    // 市外を薄く覆い、小平市内の部分だけを見せるマスク。
    // 境界線より先に追加して、境界線がマスクの上に描かれるようにする。
    const boundaryGeom = (boundary as any).features[0].geometry;
    const boundaryRings =
      boundaryGeom.type === "Polygon"
        ? boundaryGeom.coordinates
        : boundaryGeom.coordinates.map((p: any) => p[0]);
    const WORLD_RING = [
      [-180, -85],
      [180, -85],
      [180, 85],
      [-180, 85],
      [-180, -85],
    ];
    L.geoJSON(
      {
        type: "Feature",
        properties: {},
        geometry: {
          type: "Polygon",
          coordinates: [WORLD_RING, ...boundaryRings],
        },
      } as any,
      {
        style: { fillColor: "#ffffff", fillOpacity: 0.78, stroke: false },
        interactive: false,
      },
    ).addTo(map);

    // 小平市の境界線（塗りなし・太い実線）
    const boundaryLayer = L.geoJSON(boundary as any, {
      style: {
        color: "#6a1b9a",
        weight: 4,
        opacity: 0.9,
        fill: false,
      },
      interactive: false,
    }).addTo(map);

    // 拡大時だけ表示する設備アイコン（トイレ・水飲み場）
    // 一覧と一致した公園のポリゴン内にだけ表示する。
    const facilityLayer = L.layerGroup();
    layersByName.forEach((lyr, name) => {
      const p = parkDataByName.get(name);
      if (!p) return;
      const icons: string[] = [];
      if ((p["トイレ"] || "").trim()) {
        icons.push(
          '<span class="park-fac park-fac-toilet" title="トイレあり" aria-label="トイレあり">WC</span>',
        );
      }
      if ((p["水飲み場"] || "").trim()) {
        icons.push(
          '<span class="park-fac park-fac-water" title="水飲み場あり" aria-label="水飲み場あり"><svg viewBox="0 0 24 24" width="12" height="12" aria-hidden="true"><path fill="currentColor" d="M12 2.7c-3.4 4.2-6 8.1-6 11.3a6 6 0 0 0 12 0c0-3.2-2.6-7.1-6-11.3z"/></svg></span>',
        );
      }
      if (!icons.length) return;
      const center = lyr.getBounds().getCenter();
      L.marker([center.lat, center.lng], {
        icon: L.divIcon({
          className: "park-fac-markers",
          html: `<span class="park-fac-list">${icons.join("")}</span>`,
          iconSize: null,
          iconAnchor: [0, 0],
        }),
        riseOnHover: false,
      }).addTo(facilityLayer);
    });

    const updateFacilities = () => {
      if (map.getZoom() >= 16) {
        if (!map.hasLayer(facilityLayer)) facilityLayer.addTo(map);
      } else if (map.hasLayer(facilityLayer)) {
        map.removeLayer(facilityLayer);
      }
    };
    map.on("zoomend", updateFacilities);
    updateFacilities();

    let userInteracted = false;
    map.on("zoomstart dragstart", () => {
      userInteracted = true;
    });

    const fitAll = () => {
      if (userInteracted) return;
      // 初期表示は小平市の市境だけに合わせる（市外にまたがる都立公園などで広がらないように）。
      const bounds = boundaryLayer.getBounds();
      if (bounds.isValid()) {
        map.fitBounds(bounds, { padding: [20, 20], animate: false });
        return;
      }
      const parkBounds = layer.getBounds();
      if (parkBounds.isValid()) {
        map.fitBounds(parkBounds, { padding: [20, 20], animate: false });
      }
    };
    fitAll();

    const focusPark = (name: string) => {
      const target = layersByName.get(name);
      if (!target) return false;
      map.fitBounds(target.getBounds(), { padding: [40, 40], maxZoom: 17 });
      showSelected(
        name,
        target._osmName || name,
        true,
        ownerByName.get(name) || "",
      );
      return true;
    };

    document.addEventListener("park:focus", (e: Event) => {
      const name = (e as CustomEvent).detail?.name;
      if (!name || !layersByName.has(name)) return;
      el.scrollIntoView({ behavior: "smooth", block: "center" });
      focusPark(name);
    });

    document.addEventListener("park:filter", (e: Event) => {
      const detail = (e as CustomEvent).detail || {};
      const names = new Set<string>(detail.names || []);
      const active = Boolean(detail.active);
      const fromMap = Boolean(detail.fromMap);
      const visible: any[] = [];

      if (!fromMap && selectedBar) selectedBar.hidden = true;

      // 地図のポリゴンクリックで表を1件に絞った場合は、
      // ほかの公園のポリゴンを残したまま、選択した公園だけ強調する。
      if (fromMap) {
        allLayers.forEach((lyr) => {
          const name = lyr._parkName || "";
          if (name && names.has(name)) {
            lyr.setStyle(SELECTED_STYLE);
          } else {
            lyr.setStyle(name ? MATCHED_STYLE : UNMATCHED_STYLE);
          }
        });
        return;
      }

      allLayers.forEach((lyr) => {
        const name = lyr._parkName || "";
        if (!active) {
          lyr.setStyle(name ? MATCHED_STYLE : UNMATCHED_STYLE);
          return;
        }
        if (name && names.has(name)) {
          lyr.setStyle(MATCHED_STYLE);
          visible.push(lyr);
        } else {
          lyr.setStyle(DIM_STYLE);
        }
      });

      if (active && visible.length && visible.length < 30) {
        const bounds = L.featureGroup(visible).getBounds();
        if (bounds.isValid()) {
          map.fitBounds(bounds, { padding: [40, 40], maxZoom: 16 });
        }
      }
    });

    // 現在地表示（スマホでは自動で取得を試みる）
    const statusEl = document.querySelector<HTMLElement>("[data-locate-status]");
    const setStatus = (msg: string) => {
      if (!statusEl) return;
      statusEl.textContent = msg;
      statusEl.hidden = !msg;
    };

    let locationMarker: any = null;
    let accuracyCircle: any = null;
    let watchId: number | null = null;

    const locate = (center = false) => {
      if (!navigator.geolocation) {
        setStatus("このブラウザでは現在地を取得できません。");
        return;
      }
      setStatus("現在地を取得しています…");
      const onSuccess = (pos: GeolocationPosition) => {
        const { latitude, longitude, accuracy } = pos.coords;
        if (!locationMarker) {
          locationMarker = L.circleMarker([latitude, longitude], {
            radius: 7,
            color: "#ffffff",
            weight: 2,
            fillColor: "#1e88e5",
            fillOpacity: 1,
          }).bindPopup("現在地", { autoPan: false });
          locationMarker.on("add", () => {
            locationMarker.getElement()?.setAttribute("data-locate", "true");
          });
          locationMarker.addTo(map);
        } else {
          locationMarker.setLatLng([latitude, longitude]);
        }
        if (!accuracyCircle) {
          accuracyCircle = L.circle([latitude, longitude], {
            radius: Math.min(accuracy, 1000),
            color: "#1e88e5",
            weight: 1,
            fillColor: "#90caf9",
            fillOpacity: 0.15,
            interactive: false,
          }).addTo(map);
        } else {
          accuracyCircle
            .setLatLng([latitude, longitude])
            .setRadius(Math.min(accuracy, 1000));
        }
        setStatus(`現在地を表示しています（精度 約${Math.round(accuracy)}m）。`);
        if (center) map.setView([latitude, longitude], Math.max(map.getZoom(), 15));
      };
      const onError = () => {
        setStatus("現在地を取得できませんでした。位置情報の利用を許可してください。");
      };
      if (watchId !== null) navigator.geolocation.clearWatch(watchId);
      watchId = navigator.geolocation.watchPosition(onSuccess, onError, {
        enableHighAccuracy: true,
        timeout: 10000,
        maximumAge: 30000,
      });
    };

    const LocateControl = L.Control.extend({
      onAdd: () => {
        const btn = L.DomUtil.create("button", "leaflet-bar park-locate");
        btn.setAttribute("type", "button");
        btn.title = "現在地を表示";
        btn.setAttribute("aria-label", "現在地を表示");
        btn.innerHTML = '<span aria-hidden="true">◎</span>';
        L.DomEvent.disableClickPropagation(btn);
        btn.addEventListener("click", () => locate(true));
        return btn;
      },
    });
    new LocateControl({ position: "topright" }).addTo(map);

    if (window.matchMedia("(max-width: 640px)").matches) {
      locate(true);
    }
    window.addEventListener("pagehide", () => {
      if (watchId !== null) navigator.geolocation.clearWatch(watchId);
    });

    // レイアウト確定後にサイズを再計算し、タイルを再配置する。
    const refresh = () => {
      map.invalidateSize();
      tileLayer.redraw();
      fitAll();
    };
    requestAnimationFrame(refresh);
    window.setTimeout(refresh, 300);
    window.setTimeout(refresh, 1000);
    window.addEventListener("load", refresh);
    window.addEventListener("resize", () => map.invalidateSize());
  }
</script>