othersmaps/index.html at main · firstlovecenter/othersmaps · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>KML Section Viewer</title>
  <style>
    :root {
      --panel-bg: rgba(255, 255, 255, 0.9);
      --panel-border: rgba(15, 23, 42, 0.08);
      --panel-text: #122033;
      --panel-muted: #4a6078;
      --button-bg: #1769e0;
      --button-bg-hover: #0f54bb;
      --button-text: #ffffff;
      --error: #b42318;
      --shadow: 0 18px 40px rgba(15, 23, 42, 0.18);
      --radius: 16px;
    }

    * {
      box-sizing: border-box;
    }

    html,
    body {
      height: 100%;
      margin: 0;
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
      background: #dfe7ef;
      color: var(--panel-text);
    }

    body {
      overflow: hidden;
    }

    #map {
      width: 100%;
      height: 100%;
    }

    .overlay {
      position: fixed;
      top: 16px;
      left: 16px;
      z-index: 10;
      width: min(360px, calc(100vw - 32px));
      padding: 16px 18px;
      border: 1px solid var(--panel-border);
      border-radius: var(--radius);
      background: var(--panel-bg);
      box-shadow: var(--shadow);
      backdrop-filter: blur(10px);
    }

    .overlay h1 {
      margin: 0;
      font-size: 1.15rem;
      line-height: 1.3;
    }

    .overlay p {
      margin: 8px 0 0;
      font-size: 0.95rem;
      line-height: 1.45;
      color: var(--panel-muted);
    }

    .overlay p.error {
      color: var(--error);
      font-weight: 600;
    }

    .view-toggle {
      display: inline-flex;
      gap: 6px;
      margin-top: 14px;
      padding: 6px;
      border: 1px solid var(--panel-border);
      border-radius: 999px;
      background: rgba(255, 255, 255, 0.82);
    }

    .view-toggle button {
      border: 0;
      border-radius: 999px;
      padding: 8px 14px;
      font: inherit;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--panel-muted);
      background: transparent;
      cursor: pointer;
      transition: background-color 160ms ease, color 160ms ease;
    }

    .view-toggle button:hover {
      background: rgba(23, 105, 224, 0.1);
      color: var(--panel-text);
    }

    .view-toggle button.active {
      background: var(--button-bg);
      color: var(--button-text);
    }


    @media (max-width: 640px) {
      .overlay {
        top: 12px;
        left: 12px;
        width: calc(100vw - 24px);
        padding: 14px;
      }

      .overlay h1 {
        font-size: 1.05rem;
      }

      .overlay p {
        font-size: 0.9rem;
      }
    }
  </style>
</head>
<body>
  <div class="overlay">
    <h1 id="section-title">Section Viewer</h1>
    <p id="section-status">Loading map...</p>
    <div class="view-toggle" role="group" aria-label="Map view selector">
      <button id="roadmap-button" type="button" class="active" aria-pressed="true">Map</button>
      <button id="hybrid-button" type="button" aria-pressed="false">Hybrid</button>
    </div>
  </div>
  <div id="map" aria-label="Google Map"></div>

  <script>
    window.va = window.va || function() {
      (window.vaq = window.vaq || []).push(arguments);
    };
  </script>
  <script defer src="/_vercel/insights/script.js"></script>

  <script>
    const FALLBACK_CENTER = { lat: 5.6037, lng: -0.1870 };
    const FALLBACK_ZOOM = 11;
    const CONFIG_ENDPOINT = "/api/config";

    let map;
    let activePolygon = null;
    let runtimeConfig = null;
    let activeMapTypeId = "roadmap";

    async function bootstrapApp() {
      try {
        runtimeConfig = await fetchRuntimeConfig();
        await loadGoogleMapsScript(runtimeConfig.googleMapsApiKey);
        initMap();
      } catch (error) {
        console.error("Application bootstrap failed:", error);
        setHeaderState("Section not found", "Configuration could not be loaded.", true);
      }
    }

    function initMap() {
      map = new google.maps.Map(document.getElementById("map"), {
        center: FALLBACK_CENTER,
        zoom: FALLBACK_ZOOM,
        mapTypeId: "roadmap",
        streetViewControl: false,
        fullscreenControl: true,
        mapTypeControl: false
      });

      bindMapTypeToggle();
      updateMapTypeToggleState(activeMapTypeId);

      loadSectionFromUrl().catch(function(error) {
        console.error("Unhandled map initialization error:", error);
        setHeaderState("Section not found", "Unable to load the requested section.", true);
      });
    }

    async function loadSectionFromUrl() {
      const params = new URLSearchParams(window.location.search);
      const requestedZone = (params.get("zone") || "").trim();
      const requestedSection = (params.get("section") || "").trim();

      if (!requestedZone || !requestedSection) {
        console.warn("Missing required 'zone' or 'section' query parameter.");
        setHeaderState("Section not found", "Use a URL like ?zone=Zone%2013&section=1C.", true);
        return;
      }

      const selectionLabel = buildSelectionLabel(requestedZone, requestedSection);
      setHeaderState("Section: " + selectionLabel, "Loading polygon from KML...");

      const xmlDoc = await fetchKmlDocument(runtimeConfig.kmlUrl);
      const matchResult = resolvePlacemarkForZoneAndSection(xmlDoc, requestedZone, requestedSection);

      if (!matchResult) {
        console.warn("No matching Placemark was found for zone and section:", requestedZone, requestedSection);
        setHeaderState("Section not found", "No exact section match was found inside the requested zone.", true);
        return;
      }

      const matchedName = buildSelectionLabel(matchResult.zoneName, matchResult.sectionName);
      const coordinatesText = extractOuterRingCoordinates(matchResult.placemarkNode);

      if (!coordinatesText) {
        console.warn("Matching Placemark did not contain polygon coordinates:", matchedName);
        setHeaderState("Section not found", "The matching KML entry does not contain polygon coordinates.", true);
        return;
      }

      const path = parseCoordinatesString(coordinatesText);

      if (!path.length) {
        console.warn("Polygon coordinates could not be parsed for section:", matchedName);
        setHeaderState("Section not found", "Coordinates were present, but none could be parsed.", true);
        return;
      }

      drawPolygon(path);
      fitMapToPath(path);
      setHeaderState("Section: " + matchedName, "Polygon loaded successfully.");
      console.info("Loaded section:", matchedName, "with", path.length, "points.");
    }

    async function fetchRuntimeConfig() {
      const response = await fetch(CONFIG_ENDPOINT, {
        method: "GET",
        headers: {
          "Accept": "application/json"
        }
      });

      if (!response.ok) {
        throw new Error("Failed to fetch runtime config. HTTP status: " + response.status);
      }

      const config = await response.json();

      if (!config.googleMapsApiKey || !config.kmlUrl) {
        throw new Error("Runtime config is missing required values.");
      }

      return config;
    }

    function loadGoogleMapsScript(apiKey) {
      return new Promise(function(resolve, reject) {
        const existingScript = document.querySelector("script[data-google-maps-loader='true']");

        if (existingScript) {
          resolve();
          return;
        }

        window.__initGoogleMap = function() {
          resolve();
        };

        const script = document.createElement("script");
        script.src = "https://maps.googleapis.com/maps/api/js?key=" + encodeURIComponent(apiKey) + "&callback=__initGoogleMap";
        script.async = true;
        script.defer = true;
        script.dataset.googleMapsLoader = "true";
        script.onerror = function() {
          reject(new Error("Google Maps JavaScript API failed to load."));
        };

        document.head.appendChild(script);
      });
    }

    async function fetchKmlDocument(url) {
      console.info("Fetching KML from:", url);
      const response = await fetch(url, {
        method: "GET",
        headers: {
          "Accept": "application/vnd.google-earth.kml+xml, application/xml, text/xml"
        }
      });

      if (!response.ok) {
        throw new Error("Failed to fetch KML. HTTP status: " + response.status);
      }

      const xmlText = await response.text();
      const xmlDoc = new DOMParser().parseFromString(xmlText, "application/xml");
      const parserError = xmlDoc.getElementsByTagName("parsererror")[0];

      if (parserError) {
        throw new Error("Failed to parse KML XML.");
      }

      return xmlDoc;
    }

    function resolvePlacemarkForZoneAndSection(xmlDoc, zoneName, sectionName) {
      const targetZoneName = normalizeName(zoneName);
      const targetSectionName = normalizeName(sectionName);
      const root = xmlDoc.documentElement;
      let exactFolderMatch = null;
      const stack = [root];

      while (stack.length) {
        const node = stack.pop();

        if (!node || node.nodeType !== Node.ELEMENT_NODE) {
          continue;
        }

        const localName = node.localName;

        if (localName === "Folder") {
          const folderName = normalizeName(getNodeName(node));
          if (folderName === targetZoneName && !exactFolderMatch) {
            exactFolderMatch = node;
          }
        }

        for (let index = node.children.length - 1; index >= 0; index -= 1) {
          stack.push(node.children[index]);
        }
      }

      if (!exactFolderMatch) {
        return null;
      }

      const descendantPlacemark = findPlacemarkByName(exactFolderMatch, targetSectionName);

      if (descendantPlacemark) {
        console.info("Matched zone and section:", getNodeName(exactFolderMatch), getNodeName(descendantPlacemark));
        return {
          zoneName: getNodeName(exactFolderMatch),
          sectionName: getNodeName(descendantPlacemark),
          placemarkNode: descendantPlacemark,
          matchType: "zone-section"
        };
      }

      return null;
    }

    function findPlacemarkByName(rootNode, sectionName) {
      const stack = [rootNode];

      while (stack.length) {
        const node = stack.pop();

        if (!node || node.nodeType !== Node.ELEMENT_NODE) {
          continue;
        }

        if (
          node !== rootNode &&
          node.localName === "Placemark" &&
          normalizeName(getNodeName(node)) === sectionName &&
          hasPolygon(node)
        ) {
          return node;
        }

        for (let index = node.children.length - 1; index >= 0; index -= 1) {
          stack.push(node.children[index]);
        }
      }

      return null;
    }

    function hasPolygon(node) {
      return Boolean(findFirstDescendantByLocalName(node, "Polygon"));
    }

    function extractOuterRingCoordinates(placemarkNode) {
      const polygonNode = findFirstDescendantByLocalName(placemarkNode, "Polygon");

      if (!polygonNode) {
        return "";
      }

      const outerBoundary = findFirstDirectChildByLocalName(polygonNode, "outerBoundaryIs");
      const searchRoot = outerBoundary || polygonNode;
      const linearRing = findFirstDescendantByLocalName(searchRoot, "LinearRing");

      if (!linearRing) {
        return "";
      }

      const coordinatesNode = findFirstDescendantByLocalName(linearRing, "coordinates");
      return coordinatesNode ? coordinatesNode.textContent.trim() : "";
    }

    function parseCoordinatesString(coordinatesText) {
      return coordinatesText
        .trim()
        .split(/\s+/)
        .map(function(tuple) {
          const parts = tuple.split(",");

          if (parts.length < 2) {
            return null;
          }

          const lng = Number(parts[0]);
          const lat = Number(parts[1]);

          if (!Number.isFinite(lat) || !Number.isFinite(lng)) {
            return null;
          }

          return { lat: lat, lng: lng };
        })
        .filter(Boolean);
    }

    function drawPolygon(path) {
      if (activePolygon) {
        activePolygon.setMap(null);
      }

      activePolygon = new google.maps.Polygon({
        paths: path,
        strokeColor: "#d62828",
        strokeOpacity: 1,
        strokeWeight: 2.5,
        fillColor: "#d62828",
        fillOpacity: 0.24,
        clickable: false
      });

      activePolygon.setMap(map);
    }

    function bindMapTypeToggle() {
      const roadmapButton = document.getElementById("roadmap-button");
      const hybridButton = document.getElementById("hybrid-button");

      roadmapButton.addEventListener("click", function() {
        setMapType("roadmap");
      });

      hybridButton.addEventListener("click", function() {
        setMapType("hybrid");
      });
    }

    function setMapType(mapTypeId) {
      if (!map) {
        activeMapTypeId = mapTypeId;
        updateMapTypeToggleState(mapTypeId);
        return;
      }

      activeMapTypeId = mapTypeId;
      map.setMapTypeId(mapTypeId);
      updateMapTypeToggleState(mapTypeId);
    }

    function updateMapTypeToggleState(mapTypeId) {
      const roadmapButton = document.getElementById("roadmap-button");
      const hybridButton = document.getElementById("hybrid-button");
      const isHybrid = mapTypeId === "hybrid";

      roadmapButton.classList.toggle("active", !isHybrid);
      roadmapButton.setAttribute("aria-pressed", String(!isHybrid));

      hybridButton.classList.toggle("active", isHybrid);
      hybridButton.setAttribute("aria-pressed", String(isHybrid));
    }

    function fitMapToPath(path) {
      if (!path.length) {
        map.setCenter(FALLBACK_CENTER);
        map.setZoom(FALLBACK_ZOOM);
        return;
      }

      const bounds = new google.maps.LatLngBounds();

      path.forEach(function(point) {
        bounds.extend(point);
      });

      map.fitBounds(bounds);
    }

    function buildSelectionLabel(zoneName, sectionName) {
      return normalizeName(zoneName) + " / " + normalizeName(sectionName);
    }

    function setHeaderState(titleText, statusText, isError) {
      const title = document.getElementById("section-title");
      const status = document.getElementById("section-status");

      title.textContent = titleText;
      status.textContent = statusText;
      status.classList.toggle("error", Boolean(isError));
    }

    function getNodeName(node) {
      const nameNode = findFirstDirectChildByLocalName(node, "name");
      return nameNode ? nameNode.textContent.trim() : "";
    }

    function normalizeName(value) {
      return String(value || "").trim();
    }

    function findFirstDirectChildByLocalName(node, name) {
      for (let index = 0; index < node.children.length; index += 1) {
        const child = node.children[index];
        if (child.localName === name) {
          return child;
        }
      }

      return null;
    }

    function findFirstDescendantByLocalName(node, name) {
      const stack = [node];

      while (stack.length) {
        const current = stack.pop();

        if (!current || current.nodeType !== Node.ELEMENT_NODE) {
          continue;
        }

        if (current !== node && current.localName === name) {
          return current;
        }

        for (let index = current.children.length - 1; index >= 0; index -= 1) {
          stack.push(current.children[index]);
        }
      }

      return null;
    }

    document.addEventListener("DOMContentLoaded", bootstrapApp);
  </script>
</body>
</html>