upload project

utils/map-feed-helpers.js

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+const DEFAULT_THUMBNAILS = {
+  image: '/images/placeholder.svg',
+  video: 'https://res.wx.qq.com/a/wx_fed/weui-design/assets/component/picker/image-default.png',
+  mixed: '/images/placeholder.svg'
+};
+
+const MAP_FEED_MARKER_STYLE = {
+  single: {
+    background: '#f02d05',
+    color: '#FFFFFF',
+    icon: 'https://res.wx.qq.com/a/wx_fed/weui-design/assets/icon_nav/icon_nav_location_blue.png'
+  },
+  cluster: {
+    background: '#BB10BB',
+    color: '#FFFFFF',
+    icon: 'https://res.wx.qq.com/a/wx_fed/weui-design/assets/icon_nav/icon_nav_discover.png'
+  },
+  administrative: {
+    background: '#f0500a',
+    color: '#FFFFFF',
+    icon: 'https://res.wx.qq.com/a/wx_fed/weui-design/assets/icon_nav/icon_nav_map.png'
+  },
+  stranger: {
+    background: '#f0500a',
+    color: '#FFFFFF',
+    icon: 'https://res.wx.qq.com/a/wx_fed/weui-design/assets/icon_nav/icon_nav_map.png'
+  },
+  friend: {
+    background: '#44a186',
+    color: '#FFFFFF',
+    icon: 'https://res.wx.qq.com/a/wx_fed/weui-design/assets/icon_nav/icon_nav_map.png'
+  }
+};
+
+const MAP_FEED_SCALE_BUCKETS = [
+  { mode: 'nearby', level: 'street', minScale: 11 },
+  { mode: 'administrative', level: 'district', minScale: 9 },
+  { mode: 'administrative', level: 'city', minScale: 7 },
+  { mode: 'administrative', level: 'province', minScale: 5 },
+  { mode: 'administrative', level: 'country', minScale: 0 }
+];
+
+const MAP_FEED_DEBOUNCE = 400;
+const MAP_FEED_CACHE_TTL = 3 * 60 * 1000;
+const MAP_FEED_BUBBLE_LIMIT = 5;
+
+function getFeedScalePreset(scale) {
+  if (typeof scale !== 'number') {
+    return MAP_FEED_SCALE_BUCKETS[0];
+  }
+
+  return MAP_FEED_SCALE_BUCKETS.find((bucket) => scale >= bucket.minScale) || MAP_FEED_SCALE_BUCKETS[MAP_FEED_SCALE_BUCKETS.length - 1];
+}
+
+function pickCorner(bounds = {}, key) {
+  return bounds[key] || bounds[key?.toLowerCase?.()] || bounds[key?.replace?.(/([A-Z])/g, '_$1').toLowerCase?.()] || null;
+}
+
+function normalizeCorner(corner) {
+  if (!corner) {
+    return null;
+  }
+
+  if (corner.latitude !== undefined && corner.longitude !== undefined) {
+    return {
+      latitude: Number(corner.latitude),
+      longitude: Number(corner.longitude)
+    };
+  }
+
+  if (corner.lat !== undefined && corner.lng !== undefined) {
+    return {
+      latitude: Number(corner.lat),
+      longitude: Number(corner.lng)
+    };
+  }
+
+  return null;
+}
+
+function buildBoundsPayload(bounds) {
+  if (!bounds) {
+    return null;
+  }
+
+  const northEastRaw = pickCorner(bounds, 'northEast') || pickCorner(bounds, 'northeast');
+  const southWestRaw = pickCorner(bounds, 'southWest') || pickCorner(bounds, 'southwest');
+  const northEast = normalizeCorner(northEastRaw);
+  const southWest = normalizeCorner(southWestRaw);
+
+  if (!northEast || !southWest) {
+    return null;
+  }
+
+  if (Number.isNaN(northEast.latitude) || Number.isNaN(northEast.longitude) || Number.isNaN(southWest.latitude) || Number.isNaN(southWest.longitude)) {
+    return null;
+  }
+
+  return {
+    bounds: {
+      northEast,
+      southWest
+    }
+  };
+}
+
+function resolveFeedThumbnail(point = {}) {
+  let candidate = point.thumbnail || point.cover || point.preview || (Array.isArray(point.media) && point.media.length > 0 ? point.media[0]?.url : null);
+
+  if (candidate && typeof candidate === 'string') {
+    if (candidate.startsWith('/')) {
+      return candidate;
+    }
+    const lower = candidate.toLowerCase();
+    if (lower.includes('example.com') || lower.startsWith('http://example.com') || lower.includes('placeholder')) {
+      return DEFAULT_THUMBNAILS.mixed;
+    }
+    return candidate;
+  }
+
+  const typeKey = point.contentType || point.type || 'mixed';
+  return DEFAULT_THUMBNAILS[typeKey] || DEFAULT_THUMBNAILS.mixed;
+}
+
+function buildCacheKey({ mode, level }, payload = {}) {
+  const boundsKey = payload?.bounds
+    ? [
+        payload.bounds.northEast?.latitude?.toFixed(4),
+        payload.bounds.northEast?.longitude?.toFixed(4),
+        payload.bounds.southWest?.latitude?.toFixed(4),
+        payload.bounds.southWest?.longitude?.toFixed(4)
+      ].join(',')
+    : 'unknown';
+
+  const filterParts = [
+    payload?.timeFilter?.enabled ? payload.timeFilter.range : 'all',
+    Array.isArray(payload?.contentTypes) ? payload.contentTypes.sort().join('|') : 'all',
+    payload?.level || 'none'
+  ];
+
+  return `${mode}:${level}:${boundsKey}:${filterParts.join(':')}`;
+}
+
+function isCacheFresh(entry, ttl = MAP_FEED_CACHE_TTL) {
+  if (!entry || !entry.timestamp) {
+    return false;
+  }
+
+  return Date.now() - entry.timestamp < ttl;
+}
+
+module.exports = {
+  DEFAULT_THUMBNAILS,
+  MAP_FEED_SCALE_BUCKETS,
+  MAP_FEED_DEBOUNCE,
+  MAP_FEED_CACHE_TTL,
+  MAP_FEED_BUBBLE_LIMIT,
+  MAP_FEED_MARKER_STYLE,
+  getFeedScalePreset,
+  buildBoundsPayload,
+  resolveFeedThumbnail,
+  buildCacheKey,
+  isCacheFresh
+};