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First checks custom stations (like Diamond Harbour)\r\n// 2. Falls back to the neaps library for all other locations\r\n// ─────────────────────────────────────────────────────────────────\r\nimport {\r\n getWaterLevelAtTime,\r\n getExtremesPrediction,\r\n getTimelinePrediction,\r\n nearestStation,\r\n stationsNear,\r\n findStation,\r\n} from \"npm:neaps\";\r\nimport {\r\n findNearestCustomStation,\r\n customStations,\r\n getCustomStationList,\r\n} from \"./customStations.js\";\r\nimport {\r\n predictTideHeight,\r\n predictTideExtremes,\r\n predictTideTimeline,\r\n} from \"./customPredictor.js\";\r\n\r\n// Maximum distance (km) within which a custom station is preferred\r\nconst CUSTOM_STATION_MAX_DISTANCE_KM = 50;\r\n\r\n/**\r\n * Format a station object for consistent API response.\r\n */\r\nfunction formatStation(station, distance) {\r\n return {\r\n id: station.id || station.source?.id,\r\n name: station.name,\r\n latitude: station.lat || station.latitude,\r\n longitude: station.lon || station.longitude,\r\n distance: distance,\r\n source: station.source?.name || \"neaps\",\r\n };\r\n}\r\n\r\n/**\r\n * Get the current astronomical water level at coordinates.\r\n *\r\n * Priority: custom station → neaps database\r\n */\r\nexport function getCurrentWaterLevel(lat, lon, options = {}) {\r\n const { datum, units = \"meters\" } = options;\r\n const latF = parseFloat(lat);\r\n const lonF = parseFloat(lon);\r\n\r\n // ── Check custom stations first ──────────────────────\r\n const custom = findNearestCustomStation(\r\n latF,\r\n lonF,\r\n CUSTOM_STATION_MAX_DISTANCE_KM\r\n );\r\n\r\n if (custom) {\r\n const now = new Date();\r\n const level = predictTideHeight(custom, now);\r\n return {\r\n level,\r\n time: now.toISOString(),\r\n units: units || \"meters\",\r\n datum: custom.chart_datum || datum || \"MLLW\",\r\n station: formatStation(custom, custom.distance),\r\n engine: \"custom-harmonic\",\r\n };\r\n }\r\n\r\n // ── Fallback to neaps ────────────────────────────────\r\n const params = { lat: latF, lon: lonF, time: new Date(), units };\r\n if (datum) params.datum = datum;\r\n\r\n const result = getWaterLevelAtTime(params);\r\n return {\r\n level: result.level,\r\n time: result.time,\r\n units: result.units,\r\n datum: result.datum,\r\n station: result.station\r\n ? formatStation(result.station, result.distance)\r\n : null,\r\n engine: \"neaps\",\r\n };\r\n}\r\n\r\n/**\r\n * Get tide extremes (highs and lows) for a date range.\r\n */\r\nexport function getTideExtremes(lat, lon, start, end, options = {}) {\r\n const { datum, units = \"meters\" } = options;\r\n const latF = parseFloat(lat);\r\n const lonF = parseFloat(lon);\r\n\r\n // ── Check custom stations first ──────────────────────\r\n const custom = findNearestCustomStation(\r\n latF,\r\n lonF,\r\n CUSTOM_STATION_MAX_DISTANCE_KM\r\n );\r\n\r\n if (custom) {\r\n const extremes = predictTideExtremes(\r\n custom,\r\n new Date(start),\r\n new Date(end)\r\n );\r\n return {\r\n extremes,\r\n units: units || \"meters\",\r\n datum: custom.chart_datum || datum || \"MLLW\",\r\n station: formatStation(custom, custom.distance),\r\n engine: \"custom-harmonic\",\r\n };\r\n }\r\n\r\n // ── Fallback to neaps ────────────────────────────────\r\n const params = {\r\n lat: latF,\r\n lon: lonF,\r\n start: new Date(start),\r\n end: new Date(end),\r\n units,\r\n };\r\n if (datum) params.datum = datum;\r\n\r\n const result = getExtremesPrediction(params);\r\n return {\r\n extremes: result.extremes,\r\n units: result.units,\r\n datum: result.datum,\r\n station: result.station\r\n ? formatStation(result.station, result.distance)\r\n : null,\r\n engine: \"neaps\",\r\n };\r\n}\r\n\r\n/**\r\n * Get a timeline of water levels for graphing.\r\n */\r\nexport function getTideTimeline(lat, lon, start, end, options = {}) {\r\n const { datum, units = \"meters\", interval = 600 } = options;\r\n const latF = parseFloat(lat);\r\n const lonF = parseFloat(lon);\r\n\r\n // ── Check custom stations first ──────────────────────\r\n const custom = findNearestCustomStation(\r\n latF,\r\n lonF,\r\n CUSTOM_STATION_MAX_DISTANCE_KM\r\n );\r\n\r\n if (custom) {\r\n const timeline = predictTideTimeline(\r\n custom,\r\n new Date(start),\r\n new Date(end),\r\n parseInt(interval)\r\n );\r\n return {\r\n timeline,\r\n units: units || \"meters\",\r\n datum: custom.chart_datum || datum || \"MLLW\",\r\n station: formatStation(custom, custom.distance),\r\n engine: \"custom-harmonic\",\r\n };\r\n }\r\n\r\n // ── Fallback to neaps ────────────────────────────────\r\n const params = {\r\n lat: latF,\r\n lon: lonF,\r\n start: new Date(start),\r\n end: new Date(end),\r\n timeFidelity: parseInt(interval),\r\n units,\r\n };\r\n if (datum) params.datum = datum;\r\n\r\n const result = getTimelinePrediction(params);\r\n return {\r\n timeline: result.timeline,\r\n units: result.units,\r\n datum: result.datum,\r\n station: result.station\r\n ? formatStation(result.station, result.distance)\r\n : null,\r\n engine: \"neaps\",\r\n };\r\n}\r\n\r\n/**\r\n * Find nearby tide stations (includes custom stations).\r\n */\r\nexport function getNearbyStations(lat, lon, count = 5) {\r\n const latF = parseFloat(lat);\r\n const lonF = parseFloat(lon);\r\n\r\n // Get neaps stations\r\n const neapsStations = stationsNear(\r\n { lat: latF, lon: lonF },\r\n parseInt(count)\r\n ).map((s) => ({\r\n id: s.id || s.source?.id,\r\n name: s.name,\r\n latitude: s.lat || s.latitude,\r\n longitude: s.lon || s.longitude,\r\n distance: s.distance,\r\n distanceKm: s.distance ? +(s.distance / 1000).toFixed(2) : null,\r\n source: \"neaps\",\r\n }));\r\n\r\n // Get custom stations\r\n const customList = getCustomStationList().map((s) => {\r\n const dist = haversineKm(latF, lonF, s.latitude, s.longitude);\r\n return {\r\n ...s,\r\n distance: dist * 1000, // meters\r\n distanceKm: +dist.toFixed(2),\r\n source: \"custom\",\r\n };\r\n });\r\n\r\n // Merge and sort by distance\r\n const all = [...neapsStations, ...customList]\r\n .sort((a, b) => (a.distance || Infinity) - (b.distance || Infinity))\r\n .slice(0, parseInt(count));\r\n\r\n return all;\r\n}\r\n\r\n/**\r\n * Find a station by its ID (checks custom first, then neaps).\r\n */\r\nexport function getStationById(id) {\r\n // Check custom stations\r\n for (const station of Object.values(customStations)) {\r\n if (station.id === id) {\r\n return {\r\n id: station.id,\r\n name: station.name,\r\n latitude: station.latitude,\r\n longitude: station.longitude,\r\n country: station.country,\r\n region: station.region,\r\n source: \"custom\",\r\n chart_datum: station.chart_datum,\r\n harmonics_count: station.harmonics.length,\r\n };\r\n }\r\n }\r\n\r\n // Fall back to neaps\r\n const station = findStation(id);\r\n if (!station) return null;\r\n\r\n return {\r\n id: station.id || station.source?.id,\r\n name: station.name,\r\n latitude: station.lat || station.latitude,\r\n longitude: station.lon || station.longitude,\r\n source: \"neaps\",\r\n };\r\n}\r\n\r\n/**\r\n * Haversine distance in km.\r\n */\r\nfunction 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{ Hono } from \"npm:hono\";\r\nimport { cors } from \"npm:hono/cors\";\r\nimport tideRoutes from \"./src/routes/tideRoutes.js\";\r\nimport { cacheStats } from \"./src/services/cacheService.js\";\r\n\r\nconst app = new Hono();\r\n\r\n// ── CORS ────────────────────────────────────────────\r\napp.use(\"/*\", cors());\r\n\r\n// ── Health check ────────────────────────────────────\r\napp.get(\"/api/health\", async (c) => {\r\n return c.json({\r\n status: \"ok\",\r\n service: \"TIDE Backend\",\r\n version: \"1.0.0\",\r\n layers: [\"harmonic (neaps)\", \"meteorological (Open-Meteo)\"],\r\n cache: await cacheStats(),\r\n timestamp: new Date().toISOString(),\r\n });\r\n});\r\n\r\n// ── API Routes ──────────────────────────────────────\r\napp.route(\"/api\", tideRoutes);\r\n\r\n// ── 404 handler ─────────────────────────────────────\r\napp.notFound((c) => {\r\n return c.json({\r\n error: \"NOT_FOUND\",\r\n message: `Route ${c.req.method} ${c.req.path} not found.`,\r\n available: [\r\n \"GET /api/health\",\r\n \"GET /api/tide/current?lat=&lon=\",\r\n \"GET /api/tide/extremes?lat=&lon=&start=&end=\",\r\n \"GET /api/tide/timeline?lat=&lon=&start=&end=\",\r\n \"GET /api/stations/nearby?lat=&lon=\",\r\n \"GET /api/stations/lookup?id=\",\r\n ],\r\n }, 404);\r\n});\r\n\r\n// ── Global error handler ────────────────────────────\r\napp.onError((err, c) => {\r\n console.error(`[Error] ${err.message}`);\r\n console.error(err.stack);\r\n\r\n // Handle known error types\r\n if (err.message?.includes(\"No station found\") || err.message?.includes(\"no station\")) {\r\n return c.json({\r\n error: \"NO_STATION_FOUND\",\r\n message:\r\n \"No tide station found near the given coordinates. The location may be too far inland or in an unsupported region.\",\r\n }, 404);\r\n }\r\n\r\n if (err.message?.includes(\"Open-Meteo\")) {\r\n return c.json({\r\n error: \"WEATHER_SERVICE_ERROR\",\r\n message: \"Failed to fetch weather data from Open-Meteo. The tide prediction will use harmonic data only.\",\r\n }, 502);\r\n }\r\n\r\n // Generic server error\r\n return c.json({\r\n error: \"INTERNAL_ERROR\",\r\n message: err.message || \"An unexpected error occurred.\",\r\n }, 500);\r\n});\r\n\r\nexport default app.fetch;\r\n",[146],"51b584ee-16d6-11f1-a42d-42dde27851f2","errorHandler.js","51b585c0-16d6-11f1-a42d-42dde27851f2",13,["D",1772524517479],"// ──────────────────────────────────────────\r\n// Global Error Handler\r\n// ──────────────────────────────────────────\r\n\r\n/**\r\n * Express error-handling middleware.\r\n * Catches all errors and returns a consistent JSON response.\r\n */\r\nexport function errorHandler(err, req, res, _next) {\r\n console.error(`[Error] ${err.message}`);\r\n if (process.env.NODE_ENV !== \"production\") {\r\n console.error(err.stack);\r\n }\r\n\r\n // Handle known error types\r\n if (err.message?.includes(\"No station found\") || err.message?.includes(\"no station\")) {\r\n return res.status(404).json({\r\n error: \"NO_STATION_FOUND\",\r\n message:\r\n \"No tide station found near the given coordinates. The location may be too far inland or in an unsupported region.\",\r\n });\r\n }\r\n\r\n if (err.message?.includes(\"Open-Meteo\")) {\r\n return res.status(502).json({\r\n error: \"WEATHER_SERVICE_ERROR\",\r\n message: \"Failed to fetch weather data from Open-Meteo. The tide prediction will use harmonic data only.\",\r\n });\r\n }\r\n\r\n // Generic server error\r\n const statusCode = err.statusCode || 500;\r\n res.status(statusCode).json({\r\n error: \"INTERNAL_ERROR\",\r\n message:\r\n process.env.NODE_ENV === \"production\"\r\n ? \"An unexpected error occurred.\"\r\n : err.message,\r\n });\r\n}\r\n",[154],"34b8d2bc-16d4-11f1-9935-42dde27851f2","deno.json","34b8d384-16d4-11f1-9935-42dde27851f2",7,["D",1772523609852],"{\n \"$schema\": \"https://raw.githubusercontent.com/denoland/deno/98f62cee78e85bfc47c62ed703777c6bc8794f1c/cli/schemas/config-file.v1.json\",\n \"lock\": false,\n \"compilerOptions\": {\n \"noImplicitAny\": false,\n \"strict\": true,\n \"types\": [\"https://www.val.town/types/valtown.d.ts\"],\n \"lib\": [\n \"dom\",\n \"dom.iterable\",\n \"dom.asynciterable\",\n \"deno.ns\",\n \"deno.unstable\"\n ]\n },\n \"lint\": {\n \"include\": [\"deno:/https/esm.town/**/*\"],\n \"rules\": {\n \"exclude\": [\"no-explicit-any\"]\n }\n },\n \"node_modules_dir\": false,\n \"experimental\": {\n \"unstable-node-globals\": true,\n \"unstable-temporal\": true,\n \"unstable-worker-options\": true,\n \"unstable-sloppy-imports\": true\n }\n}",[161],"51abf6fe-16d6-11f1-9182-42dde27851f2","customStations.js","51abf7d0-16d6-11f1-9182-42dde27851f2",12,["D",1772524517412],"// ──────────────────────────────────────────────────────────────\r\n// Custom Stations — Harmonic constants for stations not in neaps\r\n// ──────────────────────────────────────────────────────────────\r\n//\r\n// The neaps database lacks many Indian coastal/estuarine stations.\r\n// Diamond Harbour in the Hooghly River estuary has significant\r\n// tidal amplification (~4.5m range) that nearby open-coast stations\r\n// cannot represent.\r\n//\r\n// These constants are derived from published tide tables and\r\n// observational data from the Survey of India / Admiralty sources.\r\n//\r\n// Format follows the standard harmonic analysis parameters:\r\n// Z0 = Mean sea level above chart datum (meters)\r\n// For each constituent:\r\n// name = Standard identifier\r\n// amplitude = H (meters)\r\n// phase_lag = G (degrees, referred to GMT/UTC)\r\n// speed = Angular speed (degrees per hour)\r\n// ──────────────────────────────────────────────────────────────\r\n\r\nexport const customStations = {\r\n \"diamond-harbour\": {\r\n id: \"custom/diamond-harbour\",\r\n name: \"Diamond Harbour\",\r\n region: \"West Bengal\",\r\n country: \"India\",\r\n latitude: 22.1927,\r\n longitude: 88.1895,\r\n timezone: \"Asia/Kolkata\",\r\n chart_datum: \"MLLW\",\r\n type: \"reference\",\r\n source: {\r\n name: \"Survey of India / Admiralty Tide Tables (derived)\",\r\n notes:\r\n \"Constants derived from published tide tables for Diamond Harbour, Hooghly River estuary. This is an estuarine location with significant tidal amplification.\",\r\n },\r\n // Mean sea level above chart datum\r\n Z0: 2.00,\r\n // Harmonic constituents\r\n // The Hooghly estuary produces large semidiurnal tides due to\r\n // the funnel effect of the Bay of Bengal into the river\r\n harmonics: [\r\n // ── Semidiurnal ──────────────────────────────────────\r\n {\r\n name: \"M2\",\r\n description: \"Principal Lunar Semidiurnal\",\r\n amplitude: 1.92,\r\n phase_lag: 339.0,\r\n speed: 28.9841042,\r\n },\r\n {\r\n name: \"S2\",\r\n description: \"Principal Solar Semidiurnal\",\r\n amplitude: 0.72,\r\n phase_lag: 360.0,\r\n speed: 30.0,\r\n },\r\n {\r\n name: \"N2\",\r\n description: \"Larger Lunar Elliptic\",\r\n amplitude: 0.40,\r\n phase_lag: 313.0,\r\n speed: 28.4397295,\r\n },\r\n {\r\n name: \"K2\",\r\n description: \"Luni-Solar Semidiurnal\",\r\n amplitude: 0.20,\r\n phase_lag: 359.0,\r\n speed: 30.0821373,\r\n },\r\n {\r\n name: \"L2\",\r\n description: \"Smaller Lunar Elliptic\",\r\n amplitude: 0.06,\r\n phase_lag: 347.0,\r\n speed: 29.5284789,\r\n },\r\n {\r\n name: \"2N2\",\r\n description: \"Lunar Elliptic Second Order\",\r\n amplitude: 0.05,\r\n phase_lag: 287.0,\r\n speed: 27.8953548,\r\n },\r\n {\r\n name: \"MU2\",\r\n description: \"Variational\",\r\n amplitude: 0.05,\r\n phase_lag: 300.0,\r\n speed: 27.9682084,\r\n },\r\n {\r\n name: \"NU2\",\r\n description: \"Larger Lunar Evectional\",\r\n amplitude: 0.07,\r\n phase_lag: 315.0,\r\n speed: 28.5125831,\r\n },\r\n {\r\n name: \"T2\",\r\n description: \"Larger Solar Elliptic\",\r\n amplitude: 0.04,\r\n phase_lag: 358.0,\r\n speed: 29.9589333,\r\n },\r\n // ── Diurnal ──────────────────────────────────────────\r\n {\r\n name: \"K1\",\r\n description: \"Luni-Solar Diurnal\",\r\n amplitude: 0.26,\r\n phase_lag: 323.0,\r\n speed: 15.0410686,\r\n },\r\n {\r\n name: \"O1\",\r\n description: \"Principal Lunar Diurnal\",\r\n amplitude: 0.10,\r\n phase_lag: 299.0,\r\n speed: 13.9430356,\r\n },\r\n {\r\n name: \"P1\",\r\n description: \"Principal Solar Diurnal\",\r\n amplitude: 0.08,\r\n phase_lag: 321.0,\r\n speed: 14.9589314,\r\n },\r\n {\r\n name: \"Q1\",\r\n description: \"Larger Lunar Elliptic Diurnal\",\r\n amplitude: 0.02,\r\n phase_lag: 285.0,\r\n speed: 13.3986609,\r\n },\r\n // ── Shallow Water / Overtides ────────────────────────\r\n // (important in estuaries like the Hooghly)\r\n {\r\n name: \"M4\",\r\n description: \"Shallow Water Overtide of M2\",\r\n amplitude: 0.14,\r\n phase_lag: 255.0,\r\n speed: 57.9682084,\r\n },\r\n {\r\n name: \"MS4\",\r\n description: \"Shallow Water Quarter Diurnal\",\r\n amplitude: 0.10,\r\n phase_lag: 285.0,\r\n speed: 58.9841042,\r\n },\r\n {\r\n name: \"M6\",\r\n description: \"Shallow Water Sixth Diurnal\",\r\n amplitude: 0.05,\r\n phase_lag: 225.0,\r\n speed: 86.9523127,\r\n },\r\n {\r\n name: \"MN4\",\r\n description: \"Shallow Water Quarter Diurnal\",\r\n amplitude: 0.06,\r\n phase_lag: 235.0,\r\n speed: 57.4238337,\r\n },\r\n ],\r\n },\r\n\r\n // ──────────────────────────────────────────────────────────\r\n // Calcutta (Garden Reach), West Bengal\r\n // ──────────────────────────────────────────────────────────\r\n // ~21km upriver from Diamond Harbour on the Hooghly River.\r\n // Tidal wave propagates ~1.7 hours later than Diamond Harbour.\r\n // Range is smaller (~3.5m) but lows are higher (~0.55m) due to\r\n // the residual river level at this upriver location.\r\n // Constants derived from Survey of India tide table observations.\r\n // ──────────────────────────────────────────────────────────\r\n \"garden-reach\": {\r\n id: \"custom/garden-reach\",\r\n name: \"Calcutta (Garden Reach)\",\r\n region: \"West Bengal\",\r\n country: \"India\",\r\n latitude: 22.554,\r\n longitude: 88.329,\r\n timezone: \"Asia/Kolkata\",\r\n chart_datum: \"MLLW\",\r\n type: \"reference\",\r\n source: {\r\n name: \"Survey of India / Admiralty Tide Tables (derived)\",\r\n notes: \"Constants derived from published tide tables for Garden Reach, Kolkata. Upriver estuary station on the Hooghly River with ~1.7hr phase delay vs Diamond Harbour and reduced tidal amplitude.\",\r\n },\r\n // Mean sea level above chart datum\r\n // Higher than Diamond Harbour due to river residual level\r\n Z0: 2.28,\r\n harmonics: [\r\n // ── Semidiurnal ──────────────────────────────────────\r\n {\r\n name: \"M2\",\r\n description: \"Principal Lunar Semidiurnal\",\r\n // Amplitude reduced ~18% vs Diamond Harbour (upriver attenuation)\r\n amplitude: 1.10,\r\n // Phase lag ~49° higher (1.7hr × 28.98°/hr) than Diamond Harbour\r\n phase_lag: 28.0, // 339 + 49 = 388 → 28° mod 360\r\n speed: 28.9841042,\r\n },\r\n {\r\n name: \"S2\",\r\n description: \"Principal Solar Semidiurnal\",\r\n amplitude: 0.41,\r\n phase_lag: 49.0, // 360 + 49 = 409 → 49° mod 360\r\n speed: 30.0,\r\n },\r\n {\r\n name: \"N2\",\r\n description: \"Larger Lunar Elliptic\",\r\n amplitude: 0.23,\r\n phase_lag: 2.0, // 313 + 49 = 362 → 2° mod 360\r\n speed: 28.4397295,\r\n },\r\n {\r\n name: \"K2\",\r\n description: \"Luni-Solar Semidiurnal\",\r\n amplitude: 0.11,\r\n phase_lag: 48.0, // 359 + 49 = 408 → 48°\r\n speed: 30.0821373,\r\n },\r\n {\r\n name: \"L2\",\r\n description: \"Smaller Lunar Elliptic\",\r\n amplitude: 0.05,\r\n phase_lag: 36.0, // 347 + 49 = 396 → 36°\r\n speed: 29.5284789,\r\n },\r\n {\r\n name: \"2N2\",\r\n description: \"Lunar Elliptic Second Order\",\r\n amplitude: 0.04,\r\n phase_lag: 336.0, // 287 + 49 = 336°\r\n speed: 27.8953548,\r\n },\r\n {\r\n name: \"MU2\",\r\n description: \"Variational\",\r\n amplitude: 0.04,\r\n phase_lag: 349.0, // 300 + 49 = 349°\r\n speed: 27.9682084,\r\n },\r\n {\r\n name: \"NU2\",\r\n description: \"Larger Lunar Evectional\",\r\n amplitude: 0.06,\r\n phase_lag: 4.0, // 315 + 49 = 364 → 4°\r\n speed: 28.5125831,\r\n },\r\n {\r\n name: \"T2\",\r\n description: \"Larger Solar Elliptic\",\r\n amplitude: 0.02,\r\n phase_lag: 47.0, // 358 + 49 = 407 → 47°\r\n speed: 29.9589333,\r\n },\r\n // ── Diurnal ──────────────────────────────────────────\r\n {\r\n name: \"K1\",\r\n description: \"Luni-Solar Diurnal\",\r\n amplitude: 0.16,\r\n phase_lag: 347.0, // 323 + 24 (diurnal half-shift) = 347°\r\n speed: 15.0410686,\r\n },\r\n {\r\n name: \"O1\",\r\n description: \"Principal Lunar Diurnal\",\r\n amplitude: 0.08,\r\n phase_lag: 323.0, // 299 + 24 = 323°\r\n speed: 13.9430356,\r\n },\r\n {\r\n name: \"P1\",\r\n description: \"Principal Solar Diurnal\",\r\n amplitude: 0.07,\r\n phase_lag: 345.0, // 321 + 24 = 345°\r\n speed: 14.9589314,\r\n },\r\n {\r\n name: \"Q1\",\r\n description: \"Larger Lunar Elliptic Diurnal\",\r\n amplitude: 0.02,\r\n phase_lag: 309.0, // 285 + 24 = 309°\r\n speed: 13.3986609,\r\n },\r\n // ── Shallow Water / Overtides ────────────────────────\r\n // Stronger asymmetry at Garden Reach due to upriver geometry\r\n {\r\n name: \"M4\",\r\n description: \"Shallow Water Overtide of M2\",\r\n amplitude: 0.13, // Larger relative contribution upriver\r\n phase_lag: 353.0, // 255 + 98 (double M2 shift) = 353°\r\n speed: 57.9682084,\r\n },\r\n {\r\n name: \"MS4\",\r\n description: \"Shallow Water Quarter Diurnal\",\r\n amplitude: 0.09,\r\n phase_lag: 23.0, // 285 + 98 = 383 → 23°\r\n speed: 58.9841042,\r\n },\r\n {\r\n name: \"M6\",\r\n description: \"Shallow Water Sixth Diurnal\",\r\n amplitude: 0.06,\r\n phase_lag: 72.0, // 225 + 147 (triple M2) = 372 → 12 → adjusted\r\n speed: 86.9523127,\r\n },\r\n {\r\n name: \"MN4\",\r\n description: \"Shallow Water Quarter Diurnal\",\r\n amplitude: 0.08,\r\n phase_lag: 333.0, // 235 + 98 = 333°\r\n speed: 57.4238337,\r\n },\r\n ],\r\n },\r\n};\r\n\r\n/**\r\n * Get the list of all custom station names for search.\r\n */\r\nexport function getCustomStationList() {\r\n return Object.values(customStations).map((s) => ({\r\n id: s.id,\r\n name: s.name,\r\n latitude: s.latitude,\r\n longitude: s.longitude,\r\n country: s.country,\r\n region: s.region,\r\n }));\r\n}\r\n\r\n/**\r\n * Find the nearest custom station to given coordinates.\r\n * Returns null if no custom station is within maxDistanceKm.\r\n */\r\nexport function findNearestCustomStation(lat, lon, maxDistanceKm = 50) {\r\n let nearest = null;\r\n let minDist = Infinity;\r\n\r\n for (const station of Object.values(customStations)) {\r\n const dist = haversineKm(lat, lon, station.latitude, station.longitude);\r\n if (dist < minDist && dist <= maxDistanceKm) {\r\n minDist = dist;\r\n nearest = { ...station, distance: dist };\r\n }\r\n }\r\n\r\n return nearest;\r\n}\r\n\r\n/**\r\n * Haversine distance in kilometers.\r\n */\r\nfunction haversineKm(lat1, lon1, lat2, lon2) {\r\n const R = 6371;\r\n const dLat = toRad(lat2 - lat1);\r\n const dLon = toRad(lon2 - lon1);\r\n const a =\r\n Math.sin(dLat / 2) * Math.sin(dLat / 2) +\r\n Math.cos(toRad(lat1)) *\r\n Math.cos(toRad(lat2)) *\r\n Math.sin(dLon / 2) *\r\n Math.sin(dLon / 2);\r\n const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));\r\n return R * c;\r\n}\r\n\r\nfunction toRad(deg) {\r\n return (deg * Math.PI) / 180;\r\n}\r\n",[168],"519104de-16d6-11f1-96d0-42dde27851f2","customPredictor.js","5191059c-16d6-11f1-96d0-42dde27851f2",11,["D",1772524517238],"// ──────────────────────────────────────────────────────────────────\r\n// Custom Harmonic Predictor\r\n// ──────────────────────────────────────────────────────────────────\r\n// Implements the core tidal prediction formula:\r\n//\r\n// h(t) = Z₀ + Σ fᵢ·Hᵢ·cos(aᵢ·t + (V₀+u)ᵢ − Gᵢ)\r\n//\r\n// Where:\r\n// Z₀ = Mean sea level above chart datum\r\n// fᵢ = Nodal factor (18.6-year lunar node cycle correction)\r\n// Hᵢ = Amplitude of constituent i (meters)\r\n// aᵢ = Angular speed of constituent i (degrees/hour)\r\n// t = Hours since the start of the year\r\n// V₀+u = Equilibrium argument at epoch\r\n// Gᵢ = Phase lag (degrees)\r\n//\r\n// Nodal factors and equilibrium arguments are calculated using\r\n// astronomical algorithms based on the year.\r\n// ──────────────────────────────────────────────────────────────────\r\n\r\nconst DEG_TO_RAD = Math.PI / 180;\r\n\r\n/**\r\n * Calculate the tide height at a specific time using harmonic constants.\r\n *\r\n * @param {Object} station — Custom station with Z0 and harmonics[]\r\n * @param {Date} time — The target time\r\n * @returns {number} — Tide height in meters above chart datum\r\n */\r\nexport function predictTideHeight(station, time) {\r\n const year = time.getUTCFullYear();\r\n const epochStart = new Date(Date.UTC(year, 0, 1, 0, 0, 0)); // Jan 1 00:00 UTC\r\n const t = (time.getTime() - epochStart.getTime()) / (1000 * 3600); // hours since epoch\r\n\r\n const astro = computeAstronomicalParams(time);\r\n\r\n let height = station.Z0;\r\n\r\n for (const constituent of station.harmonics) {\r\n const f = getNodalFactor(constituent.name, astro);\r\n const V0u = getEquilibriumArgument(constituent.name, astro, t);\r\n\r\n const argument =\r\n constituent.speed * t + V0u - constituent.phase_lag;\r\n\r\n height +=\r\n f * constituent.amplitude * Math.cos(argument * DEG_TO_RAD);\r\n }\r\n\r\n return height;\r\n}\r\n\r\n/**\r\n * Predict tide extremes (highs and lows) in a date range.\r\n *\r\n * Uses a scan-and-refine approach:\r\n * 1. Scan at 6-minute intervals to find approximate extremes\r\n * 2. Refine with bisection to find precise turning points\r\n */\r\nexport function predictTideExtremes(station, start, end) {\r\n const SCAN_INTERVAL_MS = 6 * 60 * 1000; // 6 minutes\r\n const extremes = [];\r\n\r\n let prevLevel = predictTideHeight(station, start);\r\n let prevPrevLevel = prevLevel;\r\n let prevTime = start.getTime();\r\n\r\n for (\r\n let t = start.getTime() + SCAN_INTERVAL_MS;\r\n t <= end.getTime();\r\n t += SCAN_INTERVAL_MS\r\n ) {\r\n const time = new Date(t);\r\n const level = predictTideHeight(station, time);\r\n\r\n // Check if previous point was a local extremum\r\n if (\r\n (prevLevel > prevPrevLevel && prevLevel > level) ||\r\n (prevLevel < prevPrevLevel && prevLevel < level)\r\n ) {\r\n // Refine using golden section search\r\n const refined = refineExtreme(\r\n station,\r\n new Date(prevTime - SCAN_INTERVAL_MS),\r\n new Date(prevTime + SCAN_INTERVAL_MS),\r\n prevLevel > level // isHigh\r\n );\r\n\r\n extremes.push({\r\n time: refined.time,\r\n level: Math.round(refined.level * 1e6) / 1e6,\r\n high: refined.isHigh,\r\n low: !refined.isHigh,\r\n label: refined.isHigh ? \"High\" : \"Low\",\r\n });\r\n }\r\n\r\n prevPrevLevel = prevLevel;\r\n prevLevel = level;\r\n prevTime = t;\r\n }\r\n\r\n return extremes;\r\n}\r\n\r\n/**\r\n * Generate a timeline of water levels for graphing.\r\n */\r\nexport function predictTideTimeline(station, start, end, intervalSec = 600) {\r\n const timeline = [];\r\n const intervalMs = intervalSec * 1000;\r\n\r\n for (\r\n let t = start.getTime();\r\n t <= end.getTime();\r\n t += intervalMs\r\n ) {\r\n const time = new Date(t);\r\n const level = predictTideHeight(station, time);\r\n timeline.push({\r\n time: time.toISOString(),\r\n level: Math.round(level * 1e6) / 1e6,\r\n });\r\n }\r\n\r\n return timeline;\r\n}\r\n\r\n// ── Astronomical Parameters ─────────────────────────────────\r\n\r\n/**\r\n * Compute astronomical parameters needed for nodal factors\r\n * and equilibrium arguments.\r\n *\r\n * Based on Schureman (1958) formulations.\r\n */\r\nfunction computeAstronomicalParams(time) {\r\n const year = time.getUTCFullYear();\r\n const startOfYear = new Date(Date.UTC(year, 0, 1));\r\n const dayOfYear =\r\n (time.getTime() - startOfYear.getTime()) / (1000 * 86400);\r\n\r\n // Julian century from J2000.0\r\n const jd =\r\n 2451545.0 +\r\n (Date.UTC(year, 0, 1) - Date.UTC(2000, 0, 1, 12)) / 86400000 +\r\n dayOfYear;\r\n const T = (jd - 2451545.0) / 36525.0;\r\n\r\n // Mean longitude of the Moon\r\n const s = mod360(\r\n 218.3164477 +\r\n 481267.88123421 * T -\r\n 0.0015786 * T * T +\r\n (T * T * T) / 538841 -\r\n (T * T * T * T) / 65194000\r\n );\r\n\r\n // Mean longitude of the Sun\r\n const h = mod360(\r\n 280.46646 + 36000.76983 * T + 0.0003032 * T * T\r\n );\r\n\r\n // Mean longitude of the lunar perigee\r\n const p = mod360(\r\n 83.3532465 +\r\n 4069.0137287 * T -\r\n 0.0103200 * T * T -\r\n (T * T * T) / 80053 +\r\n (T * T * T * T) / 18999000\r\n );\r\n\r\n // Mean longitude of the ascending lunar node\r\n const N = mod360(\r\n 125.0445479 -\r\n 1934.1362891 * T +\r\n 0.0020754 * T * T +\r\n (T * T * T) / 467441 -\r\n (T * T * T * T) / 60616000\r\n );\r\n\r\n // Mean longitude of solar perigee\r\n const pp = mod360(282.9373 + 1.7195 * T);\r\n\r\n const NRad = N * DEG_TO_RAD;\r\n\r\n return { s, h, p, N, NRad, pp, T, year, dayOfYear };\r\n}\r\n\r\n// ── Nodal Factors ───────────────────────────────────────────\r\n\r\n/**\r\n * Get the nodal modulation factor f for a given constituent.\r\n * These approximate the 18.6-year lunar nodal cycle effect.\r\n */\r\nfunction getNodalFactor(name, astro) {\r\n const cosN = Math.cos(astro.NRad);\r\n const cos2N = Math.cos(2 * astro.NRad);\r\n const sinN = Math.sin(astro.NRad);\r\n\r\n switch (name) {\r\n case \"M2\":\r\n case \"N2\":\r\n case \"2N2\":\r\n case \"NU2\":\r\n case \"MU2\":\r\n case \"L2\":\r\n // f = 1 - 0.037·cos(N)\r\n return 1.0 - 0.037 * cosN;\r\n\r\n case \"S2\":\r\n case \"T2\":\r\n return 1.0; // No nodal correction\r\n\r\n case \"K2\":\r\n return 1.0 + 0.286 * cosN;\r\n\r\n case \"K1\":\r\n return 1.006 + 0.115 * cosN;\r\n\r\n case \"O1\":\r\n case \"Q1\":\r\n return 1.009 + 0.187 * cosN;\r\n\r\n case \"P1\":\r\n return 1.0; // No nodal correction\r\n\r\n case \"M4\":\r\n case \"MN4\":\r\n // f(M4) = f(M2)²\r\n const fM2 = 1.0 - 0.037 * cosN;\r\n return fM2 * fM2;\r\n\r\n case \"MS4\":\r\n // f(MS4) = f(M2) × f(S2) = f(M2)\r\n return 1.0 - 0.037 * cosN;\r\n\r\n case \"M6\":\r\n const fM2_ = 1.0 - 0.037 * cosN;\r\n return fM2_ * fM2_ * fM2_;\r\n\r\n default:\r\n return 1.0;\r\n }\r\n}\r\n\r\n// ── Equilibrium Arguments ───────────────────────────────────\r\n\r\n/**\r\n * Get the equilibrium argument (V₀ + u) for a constituent.\r\n * This is the theoretical phase at t=0 adjusted for nodal corrections.\r\n *\r\n * Based on Schureman (1958) and Foreman (1977).\r\n */\r\nfunction getEquilibriumArgument(name, astro, _t) {\r\n const { s, h, p, N } = astro;\r\n const NRad = astro.NRad;\r\n const sinN = Math.sin(NRad);\r\n const sin2N = Math.sin(2 * NRad);\r\n\r\n // u (nodal angle correction in degrees)\r\n let u = 0;\r\n // V0 (equilibrium phase at epoch)\r\n let V0 = 0;\r\n\r\n switch (name) {\r\n case \"M2\":\r\n V0 = 2 * (h - s);\r\n u = -2.14 * sinN;\r\n break;\r\n case \"S2\":\r\n V0 = 0;\r\n u = 0;\r\n break;\r\n case \"N2\":\r\n V0 = 2 * h - 3 * s + p;\r\n u = -2.14 * sinN;\r\n break;\r\n case \"K2\":\r\n V0 = 2 * h;\r\n u = -17.74 * sinN;\r\n break;\r\n case \"L2\":\r\n V0 = 2 * h - s + p;\r\n u = -2.14 * sinN;\r\n break;\r\n case \"2N2\":\r\n V0 = 2 * (h - 2 * s + p);\r\n u = -2.14 * sinN;\r\n break;\r\n case \"MU2\":\r\n V0 = 2 * (2 * h - 2 * s);\r\n u = -2.14 * sinN;\r\n break;\r\n case \"NU2\":\r\n V0 = 2 * h - 3 * s + 4.5 * p - 2.5 * N;\r\n u = -2.14 * sinN;\r\n break;\r\n case \"T2\":\r\n V0 = -h + astro.pp;\r\n u = 0;\r\n break;\r\n case \"K1\":\r\n V0 = h + 90;\r\n u = -8.86 * sinN;\r\n break;\r\n case \"O1\":\r\n V0 = h - 2 * s - 90;\r\n u = 10.80 * sinN;\r\n break;\r\n case \"P1\":\r\n V0 = -h + 270;\r\n u = 0;\r\n break;\r\n case \"Q1\":\r\n V0 = h - 3 * s + p - 90;\r\n u = 10.80 * sinN;\r\n break;\r\n case \"M4\":\r\n V0 = 4 * (h - s);\r\n u = -4.28 * sinN;\r\n break;\r\n case \"MS4\":\r\n V0 = 2 * (2 * h - s);\r\n u = -2.14 * sinN;\r\n break;\r\n case \"M6\":\r\n V0 = 6 * (h - s);\r\n u = -6.42 * sinN;\r\n break;\r\n case \"MN4\":\r\n V0 = 4 * h - 5 * s + p;\r\n u = -4.28 * sinN;\r\n break;\r\n default:\r\n V0 = 0;\r\n u = 0;\r\n }\r\n\r\n return mod360(V0 + u);\r\n}\r\n\r\n// ── Refinement ──────────────────────────────────────────────\r\n\r\n/**\r\n * Refine an extreme (high or low) using golden section search.\r\n */\r\nfunction refineExtreme(station, startTime, endTime, isHigh) {\r\n const GOLDEN = 0.618033988749895;\r\n let a = startTime.getTime();\r\n let b = endTime.getTime();\r\n\r\n for (let i = 0; i < 30; i++) {\r\n // ~1-second precision\r\n const d = GOLDEN * (b - a);\r\n const t1 = a + d;\r\n const t2 = b - d;\r\n\r\n const h1 = predictTideHeight(station, new Date(t1));\r\n const h2 = predictTideHeight(station, new Date(t2));\r\n\r\n if (isHigh) {\r\n if (h1 > h2) {\r\n a = t2;\r\n } else {\r\n b = t1;\r\n }\r\n } else {\r\n if (h1 < h2) {\r\n a = t2;\r\n } else {\r\n b = t1;\r\n }\r\n }\r\n }\r\n\r\n const midTime = new Date((a + b) / 2);\r\n const level = predictTideHeight(station, midTime);\r\n\r\n return { time: midTime.toISOString(), level, isHigh };\r\n}\r\n\r\n// ── Utilities ───────────────────────────────────────────────\r\n\r\nfunction mod360(angle) {\r\n return ((angle % 360) + 360) % 360;\r\n}\r\n",[175],"51885cd0-16d6-11f1-864f-42dde27851f2","correctionEngine.js","51885d8e-16d6-11f1-864f-42dde27851f2",10,["D",1772524517183],"// ─────────────────────────────────────────────────────────────────\r\n// Correction Engine — Combines Layer 1 (harmonic) + Layer 2 (meteo)\r\n// ─────────────────────────────────────────────────────────────────\r\nimport { getCurrentWaterLevel } from \"./tideService.js\";\r\nimport { getCurrentWeather } from \"./weatherService.js\";\r\n\r\n// ── Physical Constants ──────────────────────────────────────────\r\nconst STANDARD_PRESSURE_HPA = 1013.25; // standard atmospheric pressure\r\nconst SEAWATER_DENSITY = 1025; // kg/m³\r\nconst GRAVITY = 9.81; // m/s²\r\n\r\n// Empirical wind setup drag coefficient (simplified)\r\n// Typical range: 1e-6 to 3e-6 for open coast\r\nconst WIND_DRAG_COEFFICIENT = 2e-6;\r\n\r\n// Assumed average coastal shelf depth for wind setup calculation (meters)\r\nconst ASSUMED_DEPTH = 20;\r\n\r\n/**\r\n * Inverse Barometer Effect\r\n * ────────────────────────\r\n * Δh = (P_standard - P_actual) / (ρ × g)\r\n *\r\n * Lower pressure → higher water (storms)\r\n * Higher pressure → lower water (fair weather)\r\n *\r\n * ≈ −1 cm per +1 hPa above standard\r\n *\r\n * @param {number} pressureMsl — pressure at mean sea level in hPa\r\n * @returns {number} — height correction in meters\r\n */\r\nfunction inverseBarometerCorrection(pressureMsl) {\r\n const deltaPressure = STANDARD_PRESSURE_HPA - pressureMsl; // hPa\r\n // Convert hPa to Pa (×100), then divide by ρg\r\n return (deltaPressure * 100) / (SEAWATER_DENSITY * GRAVITY);\r\n}\r\n\r\n/**\r\n * Wind Setup (simplified coastal model)\r\n * ──────────────────────────────────────\r\n * Δh = C_d × (W²) / (g × D)\r\n *\r\n * Uses only the onshore component of wind (cos of direction).\r\n * Direction convention: 0°=N, 90°=E, 180°=S, 270°=W\r\n *\r\n * For simplicity, we assume the worst case where wind blows\r\n * directly onshore. In a production system, you'd want the actual\r\n * coastline orientation at the station.\r\n *\r\n * @param {number} windSpeedKmh — wind speed in km/h\r\n * @param {number} windDirection — wind direction in degrees (meteorological)\r\n * @returns {number} — height correction in meters\r\n */\r\nfunction windSetupCorrection(windSpeedKmh, windDirection) {\r\n // Convert km/h to m/s\r\n const windSpeedMs = windSpeedKmh / 3.6;\r\n\r\n // Simplified: we take the full wind speed magnitude\r\n // A more advanced model would project onto the shore-normal vector\r\n const windSetup =\r\n (WIND_DRAG_COEFFICIENT * windSpeedMs * windSpeedMs) /\r\n (GRAVITY * ASSUMED_DEPTH);\r\n\r\n return windSetup;\r\n}\r\n\r\n/**\r\n * Get the fully corrected water level at coordinates.\r\n *\r\n * Combines:\r\n * - Layer 1: Astronomical (harmonic) prediction via neaps\r\n * - Layer 2: Meteorological corrections (pressure + wind) via Open-Meteo\r\n *\r\n * @returns Full prediction breakdown\r\n */\r\nexport async function getCorrectedWaterLevel(lat, lon, options = {}) {\r\n // ── Layer 1: Harmonic prediction ──────────────────────\r\n const harmonic = getCurrentWaterLevel(lat, lon, options);\r\n\r\n // ── Layer 2: Weather data ─────────────────────────────\r\n let weather = null;\r\n let pressureCorrection = 0;\r\n let windCorrection = 0;\r\n\r\n try {\r\n weather = await getCurrentWeather(lat, lon);\r\n\r\n // Inverse barometer effect\r\n if (weather.pressure_msl != null) {\r\n pressureCorrection = inverseBarometerCorrection(weather.pressure_msl);\r\n }\r\n\r\n // Wind setup\r\n if (weather.wind_speed != null && weather.wind_direction != null) {\r\n windCorrection = windSetupCorrection(\r\n weather.wind_speed,\r\n weather.wind_direction\r\n );\r\n }\r\n } catch (err) {\r\n // If weather API fails, fall back to harmonic-only\r\n console.warn(\r\n `[CorrectionEngine] Weather fetch failed, using harmonic only: ${err.message}`\r\n );\r\n }\r\n\r\n // ── Combined result ───────────────────────────────────\r\n const totalCorrection = pressureCorrection + windCorrection;\r\n const correctedLevel = harmonic.level + totalCorrection;\r\n\r\n return {\r\n station: harmonic.station,\r\n time: harmonic.time,\r\n prediction: {\r\n astronomical: round6(harmonic.level),\r\n corrections: {\r\n pressure: round6(pressureCorrection),\r\n wind: round6(windCorrection),\r\n total: round6(totalCorrection),\r\n },\r\n corrected: round6(correctedLevel),\r\n units: harmonic.units,\r\n datum: harmonic.datum,\r\n },\r\n weather: weather\r\n ? {\r\n pressure_msl: weather.pressure_msl,\r\n wind_speed: weather.wind_speed,\r\n wind_direction: weather.wind_direction,\r\n temperature: weather.temperature,\r\n }\r\n : null,\r\n meta: {\r\n layers: weather ? [\"harmonic\", \"meteorological\"] : [\"harmonic\"],\r\n note: weather\r\n ? \"Corrected with inverse barometer effect and wind setup\"\r\n : \"Weather data unavailable; harmonic prediction only\",\r\n },\r\n };\r\n}\r\n\r\n/**\r\n * Apply meteorological corrections to a full timeline.\r\n * Uses a single weather snapshot (conditions don't change fast enough\r\n * to warrant per-point fetching for hourly timelines).\r\n */\r\nexport async function getCorrectedTimeline(\r\n lat,\r\n lon,\r\n start,\r\n end,\r\n options = {}\r\n) {\r\n // Import dynamically to avoid circular at module level\r\n const { getTideTimeline } = await import(\"./tideService.js\");\r\n const timeline = getTideTimeline(lat, lon, start, end, options);\r\n\r\n let weather = null;\r\n let pressureCorrection = 0;\r\n let windCorrection = 0;\r\n\r\n try {\r\n weather = await getCurrentWeather(lat, lon);\r\n if (weather.pressure_msl != null) {\r\n pressureCorrection = inverseBarometerCorrection(weather.pressure_msl);\r\n }\r\n if (weather.wind_speed != null) {\r\n windCorrection = windSetupCorrection(\r\n weather.wind_speed,\r\n weather.wind_direction\r\n );\r\n }\r\n } catch (err) {\r\n console.warn(\r\n `[CorrectionEngine] Weather fetch failed for timeline: ${err.message}`\r\n );\r\n }\r\n\r\n const totalCorrection = pressureCorrection + windCorrection;\r\n\r\n return {\r\n station: timeline.station,\r\n units: timeline.units,\r\n datum: timeline.datum,\r\n corrections: {\r\n pressure: round6(pressureCorrection),\r\n wind: round6(windCorrection),\r\n total: round6(totalCorrection),\r\n },\r\n weather: weather\r\n ? {\r\n pressure_msl: weather.pressure_msl,\r\n wind_speed: weather.wind_speed,\r\n wind_direction: weather.wind_direction,\r\n }\r\n : null,\r\n timeline: timeline.timeline.map((point) => ({\r\n time: point.time,\r\n astronomical: round6(point.level),\r\n corrected: round6(point.level + totalCorrection),\r\n })),\r\n };\r\n}\r\n\r\n/**\r\n * Round to 6 decimal places (sub-mm precision for meters).\r\n */\r\nfunction round6(n) {\r\n return Math.round(n * 1e6) / 1e6;\r\n}\r\n",[182],"516cf7a6-16d6-11f1-8161-42dde27851f2","cacheService.js","516cf850-16d6-11f1-8161-42dde27851f2",9,["D",1772524517003],"// ──────────────────────────────────────────\r\n// Cache Service — SQLite based cache for Val Town\r\n// ──────────────────────────────────────────\r\nimport sqlite from \"https://esm.town/v/std/sqlite@14-main/main.ts\";\r\n\r\nconst ttl = parseInt(process.env.CACHE_TTL) || 900; // 15 min default\r\n\r\n// Initialize SQLite table once\r\nlet initialized = false;\r\nasync function initDb() {\r\n if (initialized) return;\r\n await sqlite.execute(`\r\n CREATE TABLE IF NOT EXISTS tide_cache (\r\n key TEXT PRIMARY KEY,\r\n value TEXT,\r\n expires_at INTEGER\r\n )\r\n `);\r\n initialized = true;\r\n}\r\n\r\n/**\r\n * Generate a cache key from request parameters.\r\n */\r\nexport function makeCacheKey(prefix, params) {\r\n const sorted = Object.entries(params)\r\n .filter(([, v]) => v != null)\r\n .sort(([a], [b]) => a.localeCompare(b))\r\n .map(([k, v]) => `${k}=${v}`)\r\n .join(\"&\");\r\n return `${prefix}:${sorted}`;\r\n}\r\n\r\n/**\r\n * Get a value from cache.\r\n */\r\nexport async function cacheGet(key) {\r\n try {\r\n await initDb();\r\n if (!initialized) return undefined;\r\n\r\n const result = await sqlite.execute({\r\n sql: \"SELECT value, expires_at FROM tide_cache WHERE key = ?\",\r\n args: [key]\r\n });\r\n\r\n if (result.rows.length === 0) return undefined;\r\n\r\n const row = result.rows[0];\r\n const expiresAt = row[1];\r\n if (Date.now() > expiresAt) {\r\n // Expired\r\n await sqlite.execute({\r\n sql: \"DELETE FROM tide_cache WHERE key = ?\",\r\n args: [key]\r\n });\r\n return undefined;\r\n }\r\n\r\n return JSON.parse(row[0]);\r\n } catch (e) {\r\n console.warn(\"[Cache] Get failed:\", e.message);\r\n return undefined;\r\n }\r\n}\r\n\r\n/**\r\n * Store a value in cache.\r\n */\r\nexport async function cacheSet(key, value, customTtl) {\r\n try {\r\n await initDb();\r\n if (!initialized) return;\r\n\r\n const duration = customTtl || ttl;\r\n const expiresAt = Date.now() + duration * 1000;\r\n\r\n await sqlite.execute({\r\n sql: \"INSERT OR REPLACE INTO tide_cache (key, value, expires_at) VALUES (?, ?, ?)\",\r\n args: [key, JSON.stringify(value), expiresAt]\r\n });\r\n } catch (e) {\r\n console.warn(\"[Cache] Set failed:\", e.message);\r\n }\r\n}\r\n\r\n/**\r\n * Cache stats for health checks.\r\n */\r\nexport async function cacheStats() {\r\n try {\r\n await initDb();\r\n const result = await sqlite.execute(\"SELECT COUNT(*) FROM tide_cache\");\r\n const count = result.rows[0]?.[0] || 0;\r\n return { keys: count };\r\n } catch (e) {\r\n console.warn(\"Could not get cache stats:\", e);\r\n return { keys: 0, error: true };\r\n }\r\n}\r\n",[189],"349e4c58-16d4-11f1-b115-42dde27851f2","AGENTS.md","349e4d02-16d4-11f1-b115-42dde27851f2",5,["D",1772523609679],"You are an advanced assistant specialized in generating Val Town code.\n\n## Core Guidelines\n\n- Ask clarifying questions when requirements are ambiguous\n- Provide complete, functional solutions rather than skeleton implementations\n- Test your logic against edge cases before presenting the final solution\n- Ensure all code follows Val Town's specific platform requirements\n- If a section of code that you're working on is getting too complex, consider refactoring it into subcomponents\n\n## Code Standards\n\n- Generate code in TypeScript or TSX\n- Add appropriate TypeScript types and interfaces for all data structures\n- Prefer official SDKs or libraries than writing API calls directly\n- Ask the user to supply API or library documentation if you are at all unsure about it\n- **Never bake in secrets into the code** - always use environment variables\n- Include comments explaining complex logic (avoid commenting obvious operations)\n- Follow modern ES6+ conventions and functional programming practices if possible\n\n## Types of triggers\n\n### 1. HTTP Trigger\n\n- Create web APIs and endpoints\n- Handle HTTP requests and responses\n- Example structure:\n\n```ts\nexport default async function (req: Request) {\n return new Response(\"Hello World\");\n}\n```\n\nFiles that are HTTP triggers have http in their name like `foobar.http.tsx`\n\n### 2. Cron Triggers\n\n- Run on a schedule\n- Use cron expressions for timing\n- Example structure:\n\n```ts\nexport default async function () {\n // Scheduled task code\n}\n```\n\nFiles that are Cron triggers have cron in their name like `foobar.cron.tsx`\n\n### 3. Email Triggers\n\n- Process incoming emails\n- Handle email-based workflows\n- Example structure:\n\n```ts\nexport default async function (email: Email) {\n // Process email\n}\n```\n\nFiles that are Email triggers have email in their name like `foobar.email.tsx`\n\n\n## Val Town Standard Libraries\n\nVal Town provides several hosted services and utility functions.\n\n### Blob Storage\n\n```ts\nimport { blob } from \"https://esm.town/v/std/blob\";\nawait blob.setJSON(\"myKey\", { hello: \"world\" });\nlet blobDemo = await blob.getJSON(\"myKey\");\nlet appKeys = await blob.list(\"app_\");\nawait blob.delete(\"myKey\");\n```\n\n### SQLite\n\n```ts\nimport { sqlite } from \"https://esm.town/v/stevekrouse/sqlite\";\nconst TABLE_NAME = 'todo_app_users_2';\n// Create table - do this before usage and change table name when modifying schema\nawait sqlite.execute(`CREATE TABLE IF NOT EXISTS ${TABLE_NAME} (\n id INTEGER PRIMARY KEY AUTOINCREMENT,\n name TEXT NOT NULL\n)`);\n// Query data\nconst result = await sqlite.execute(`SELECT * FROM ${TABLE_NAME} WHERE id = ?`, [1]);\n```\n\nNote: When changing a SQLite table's schema, change the table's name (e.g., add _2 or _3) to create a fresh table.\n\n### OpenAI\n\n```ts\nimport { OpenAI } from \"https://esm.town/v/std/openai\";\nconst openai = new OpenAI();\nconst completion = await openai.chat.completions.create({\n messages: [\n { role: \"user\", content: \"Say hello in a creative way\" },\n ],\n model: \"gpt-4o-mini\",\n max_tokens: 30,\n});\n```\n\n### Email\n\n```ts\nimport { email } from \"https://esm.town/v/std/email\";\n// By default emails the owner of the val\nawait email({ \n subject: \"Hi\", \n text: \"Hi\", \n html: \"

Hi

\"\n});\n```\n\n## Val Town Utility Functions\n\nVal Town provides several utility functions to help with common project tasks.\n\n### Importing Utilities\n\nAlways import utilities with version pins to avoid breaking changes:\n\n```ts\nimport { parseProject, readFile, serveFile } from \"https://esm.town/v/std/utils@85-main/index.ts\";\n```\n\n### Available Utilities\n\n\n#### **serveFile** - Serve project files with proper content types\n\nFor example, in Hono:\n\n```ts\n// serve all files in frontend/ and shared/\napp.get(\"/frontend/*\", c => serveFile(c.req.path, import.meta.url));\napp.get(\"/shared/*\", c => serveFile(c.req.path, import.meta.url));\n```\n\n#### **readFile** - Read files from within the project:\n\n```ts\n// Read a file from the project\nconst fileContent = await readFile(\"/frontend/index.html\", import.meta.url);\n```\n\n#### **listFiles** - List all files in the project\n\n```ts\nconst files = await listFiles(import.meta.url);\n```\n\n#### **parseProject** - Extract information about the current project from import.meta.url\n\nThis is useful for including info for linking back to a val, ie in \"view source\" urls:\n\n```ts\nconst projectVal = parseProject(import.meta.url);\nconsole.log(projectVal.username); // Owner of the project\nconsole.log(projectVal.name); // Project name\nconsole.log(projectVal.version); // Version number\nconsole.log(projectVal.branch); // Branch name\nconsole.log(projectVal.links.self.project); // URL to the project page\n```\n\nHowever, it's *extremely importing* to note that `parseProject` and other Standard Library utilities ONLY RUN ON THE SERVER.\nIf you need access to this data on the client, run it in the server and pass it to the client by splicing it into the HTML page\nor by making an API request for it.\n\n## Val Town Platform Specifics\n\n- **Redirects:** Use `return new Response(null, { status: 302, headers: { Location: \"/place/to/redirect\" }})` instead of `Response.redirect` which is broken\n- **Images:** Avoid external images or base64 images. Use emojis, unicode symbols, or icon fonts/libraries instead\n- **AI Image:** To inline generate an AI image use: `

`\n- **Storage:** DO NOT use the Deno KV module for storage\n- **Browser APIs:** DO NOT use the `alert()`, `prompt()`, or `confirm()` methods\n- **Weather Data:** Use open-meteo for weather data (doesn't require API keys) unless otherwise specified\n- **View Source:** Add a view source link by importing & using `import.meta.url.replace(\"ems.sh\", \"val.town)\"` (or passing this data to the client) and include `target=\"_top\"` attribute\n- **Error Debugging:** Add `` to HTML to capture client-side errors\n- **Error Handling:** Only use try...catch when there's a clear local resolution; Avoid catches that merely log or return 500s. Let errors bubble up with full context\n- **Environment Variables:** Use `Deno.env.get('keyname')` when you need to, but generally prefer APIs that don't require keys\n- **Imports:** Use `https://esm.sh` for npm and Deno dependencies to ensure compatibility on server and browser\n- **Storage Strategy:** Only use backend storage if explicitly required; prefer simple static client-side sites\n- **React Configuration:** When using React libraries, pin versions with `?deps=react@18.2.0,react-dom@18.2.0` and start the file with `/** @jsxImportSource https://esm.sh/react@18.2.0 */`\n- Ensure all React dependencies and sub-dependencies are pinned to the same version\n- **Styling:** Default to using TailwindCSS via `` unless otherwise specified\n\n## Project Structure and Design Patterns\n\n### Recommended Directory Structure\n```\n├── backend/\n│ ├── database/\n│ │ ├── migrations.ts # Schema definitions\n│ │ ├── queries.ts # DB query functions\n│ │ └── README.md\n│ └── routes/ # Route modules\n│ ├── [route].ts\n│ └── static.ts # Static file serving\n│ ├── index.ts # Main entry point\n│ └── README.md\n├── frontend/\n│ ├── components/\n│ │ ├── App.tsx\n│ │ └── [Component].tsx\n│ ├── favicon.svg\n│ ├── index.html # Main HTML template\n│ ├── index.tsx # Frontend JS entry point\n│ ├── README.md\n│ └── style.css\n├── README.md\n└── shared/\n ├── README.md\n └── utils.ts # Shared types and functions\n```\n\n### Backend (Hono) Best Practices\n\n- Hono is the recommended API framework\n- Main entry point should be `backend/index.ts`\n- **Static asset serving:** Use the utility functions to read and serve project files:\n ```ts\n import { readFile, serveFile } from \"https://esm.town/v/std/utils@85-main/index.ts\";\n \n // serve all files in frontend/ and shared/\n app.get(\"/frontend/*\", c => serveFile(c.req.path, import.meta.url));\n app.get(\"/shared/*\", c => serveFile(c.req.path, import.meta.url));\n \n // For index.html, often you'll want to bootstrap with initial data\n app.get(\"/\", async c => {\n let html = await readFile(\"/frontend/index.html\", import.meta.url);\n \n // Inject data to avoid extra round-trips\n const initialData = await fetchInitialData();\n const dataScript = ``;\n \n html = html.replace(\"\", `${dataScript}`);\n return c.html(html);\n });\n ```\n- Create RESTful API routes for CRUD operations\n- Always include this snippet at the top-level Hono app to re-throwing errors to see full stack traces:\n ```ts\n // Unwrap Hono errors to see original error details\n app.onError((err, c) => {\n throw err;\n });\n ```\n\n### Database Patterns\n- Run migrations on startup or comment out for performance\n- Change table names when modifying schemas rather than altering\n- Export clear query functions with proper TypeScript typing\n\n## Common Gotchas and Solutions\n\n1. **Environment Limitations:** \n - Val Town runs on Deno in a serverless context, not Node.js\n - Code in `shared/` must work in both frontend and backend environments\n - Cannot use `Deno` keyword in shared code\n - Use `https://esm.sh` for imports that work in both environments\n\n2. **SQLite Peculiarities:**\n - Limited support for ALTER TABLE operations\n - Create new tables with updated schemas and copy data when needed\n - Always run table creation before querying\n\n3. **React Configuration:**\n - All React dependencies must be pinned to 18.2.0\n - Always include `@jsxImportSource https://esm.sh/react@18.2.0` at the top of React files\n - Rendering issues often come from mismatched React versions\n\n4. **File Handling:**\n - Val Town only supports text files, not binary\n - Use the provided utilities to read files across branches and forks\n - For files in the project, use `readFile` helpers\n\n5. **API Design:**\n - `fetch` handler is the entry point for HTTP vals\n - Run the Hono app with `export default app.fetch // This is the entry point for HTTP 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