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* Spaceweather Horizon — PCAPM Accuracy Proxy\n * Runtime target: Val Town / Deno / edge-style Fetch handler.\n *\n * Endpoints:\n * GET /?mode=live\n * GET /?mode=history&startDate=YYYY-MM-DD&endDate=YYYY-MM-DD&minSpeed=700&maxLon=45\n * GET /?mode=similar&speed=1238&halfWidth=42&lon=-3&lat=-1&days=3650\n * POST /?mode=validate\n * GET /?mode=calibration&speed=1238&halfWidth=42&lon=-3&lat=-1\n *\n * Env vars:\n * NASA_API_KEY optional; DEMO_KEY works but is rate-limited\n * PCAPM_STORE_URL optional JSONBlob / KV / your DB endpoint for validation persistence\n * PCAPM_STORE_TOKEN optional bearer token for PCAPM_STORE_URL\n */\n\nconst NASA = \"https://api.nasa.gov/DONKI\";\nconst SWPC = \"https://services.swpc.noaa.gov\";\n\nconst CACHE_TTL_MS: Record = {\n live: 60_000,\n history: 6 * 60 * 60_000,\n similar: 6 * 60 * 60_000,\n calibration: 5 * 60_000,\n};\n\nconst memoryCache = new Map();\n\ntype DonkiCme = {\n activityID?: string;\n startTime?: string;\n sourceLocation?: string;\n 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massKg?: number;\n ambientWind?: number;\n notes?: string;\n createdUTC?: string;\n};\n\nfunction json(data: unknown, status = 200) {\n return new Response(JSON.stringify(data, null, 2), {\n status,\n headers: {\n \"content-type\": \"application/json; charset=utf-8\",\n \"access-control-allow-origin\": \"*\",\n \"access-control-allow-methods\": \"GET,POST,OPTIONS\",\n \"access-control-allow-headers\": \"content-type,authorization\",\n \"cache-control\": \"public, max-age=60\",\n },\n });\n}\n\nasync function cached(\n key: string,\n ttl: number,\n fn: () => Promise,\n): Promise {\n const hit = memoryCache.get(key);\n if (hit && Date.now() - hit.t < ttl) return hit.data as T;\n const data = await fn();\n memoryCache.set(key, { t: Date.now(), data });\n return data;\n}\n\nasync function fetchJson(url: string) {\n const r = await fetch(url, {\n headers: { \"user-agent\": \"SpaceweatherHorizon-PCAPM/1.0\" },\n });\n if (!r.ok) throw new Error(`${r.status} ${r.statusText}: ${url}`);\n return r.json();\n}\n\nfunction env(name: string): string | undefined {\n // @ts-ignore Deno is available on Val Town/Deno, process on Node-like hosts\n return globalThis?.Deno?.env?.get?.(name) ||\n (globalThis as any)?.process?.env?.[name];\n}\n\nfunction dateISO(d: Date) {\n return d.toISOString().slice(0, 10);\n}\nfunction daysAgo(n: number) {\n const d = new Date();\n d.setUTCDate(d.getUTCDate() - n);\n return dateISO(d);\n}\nfunction toNum(v: string | null, fallback: number) {\n const n = Number(v);\n return Number.isFinite(n) ? n : fallback;\n}\nfunction hoursBetween(a: string, b: string) {\n return (Date.parse(a) - Date.parse(b)) / 36e5;\n}\n\nfunction bestAnalysis(cme: DonkiCme): DonkiAnalysis | null {\n const list = Array.isArray(cme.cmeAnalyses) ? cme.cmeAnalyses : [];\n if (!list.length) return null;\n return list.find((a) => a.isMostAccurate) ||\n list.sort((a, b) => (b.levelOfData || 0) - (a.levelOfData || 0))[0];\n}\n\nfunction normalizeCme(cme: DonkiCme): NormalizedCme | null {\n const a = bestAnalysis(cme);\n if (!a) return null;\n const enlil = Array.isArray(a.enlilList) && a.enlilList.length\n ? a.enlilList[0]\n : null;\n const shock = enlil?.impactList?.find?.((x: any) =>\n /Earth/i.test(String(x.location || \"\"))\n );\n return {\n id: cme.activityID || a.time21_5 || cme.startTime || crypto.randomUUID(),\n launchTime: cme.startTime || null,\n time21_5: a.time21_5 || null,\n sourceLocation: cme.sourceLocation || null,\n activeRegionNum: cme.activeRegionNum ?? null,\n speed: finiteOrNull(a.speed),\n halfWidth: finiteOrNull(a.halfAngle),\n lon: finiteOrNull(a.longitude),\n lat: finiteOrNull(a.latitude),\n type: a.type || null,\n linkedEvents: (cme.linkedEvents || []).map((e) => e.activityID || \"\")\n .filter(Boolean),\n enlil: enlil\n ? {\n shockArrival: shock?.arrivalTime || shock?.impactTime || null,\n estimatedShockArrival: enlil.estimatedShockArrivalTime || null,\n kp18: finiteOrNull(enlil.kp_18),\n }\n : null,\n };\n}\n\nfunction finiteOrNull(v: any): number | null {\n const n = Number(v);\n return Number.isFinite(n) ? n : null;\n}\n\nasync function getDonkiCmes(\n startDate: string,\n endDate: string,\n): Promise {\n const key = env(\"NASA_API_KEY\") || \"DEMO_KEY\";\n const url = `${NASA}/CME?startDate=${startDate}&endDate=${endDate}&api_key=${\n encodeURIComponent(key)\n }`;\n const raw = await fetchJson(url) as DonkiCme[];\n return raw.map(normalizeCme).filter(Boolean) as NormalizedCme[];\n}\n\nasync function getLive() {\n const [plasma, mag, kp] = await Promise.allSettled([\n fetchJson(`${SWPC}/products/solar-wind/plasma-3-day.json`),\n fetchJson(`${SWPC}/products/solar-wind/mag-3-day.json`),\n fetchJson(`${SWPC}/json/planetary_k_index_1m.json`),\n ]);\n const latestPlasma = lastDataRow(\n plasma.status === \"fulfilled\" ? plasma.value : [],\n );\n const latestMag = lastDataRow(mag.status === \"fulfilled\" ? mag.value : []);\n return {\n generatedUTC: new Date().toISOString(),\n plasma: normalizeSwpcRow(latestPlasma),\n mag: normalizeSwpcRow(latestMag),\n kp: kp.status === \"fulfilled\" ? lastDataRow(kp.value) : null,\n sourceStatus: {\n plasma: plasma.status,\n mag: mag.status,\n kp: kp.status,\n },\n };\n}\n\nfunction lastDataRow(arr: any[]) {\n if (!Array.isArray(arr)) return null;\n for (let i = arr.length - 1; i >= 0; i--) {\n const row = arr[i];\n if (\n Array.isArray(row) && row.length > 1 &&\n !String(row[0]).toLowerCase().includes(\"time\")\n ) return row;\n if (row && typeof row === \"object\") return row;\n }\n return null;\n}\n\nfunction normalizeSwpcRow(row: any) {\n if (!row) return null;\n if (Array.isArray(row)) return row;\n return row;\n}\n\nfunction filterHistory(cmes: NormalizedCme[], q: URLSearchParams) {\n const minSpeed = toNum(q.get(\"minSpeed\"), 0);\n const maxLon = toNum(q.get(\"maxLon\"), 180);\n const minHalfWidth = toNum(q.get(\"minHalfWidth\"), 0);\n return cmes.filter((c) =>\n (c.speed ?? -1) >= minSpeed &&\n Math.abs(c.lon ?? 999) <= maxLon &&\n (c.halfWidth ?? -1) >= minHalfWidth\n );\n}\n\nfunction similarity(\n c: NormalizedCme,\n target: { speed: number; halfWidth: number; lon: number; lat: number },\n) {\n const ds = Math.abs((c.speed ?? target.speed) - target.speed) / 350;\n const dw = Math.abs((c.halfWidth ?? target.halfWidth) - target.halfWidth) /\n 18;\n const dl = Math.abs((c.lon ?? target.lon) - target.lon) / 25;\n const da = Math.abs((c.lat ?? target.lat) - target.lat) / 18;\n const score = Math.exp(-(ds * ds + dw * dw + dl * dl + da * da) / 2);\n return score;\n}\n\nasync function getSimilar(q: URLSearchParams) {\n const days = Math.min(3650, Math.max(30, toNum(q.get(\"days\"), 1825)));\n const endDate = q.get(\"endDate\") || dateISO(new Date());\n const startDate = q.get(\"startDate\") || daysAgo(days);\n const target = {\n speed: toNum(q.get(\"speed\"), 1000),\n halfWidth: toNum(q.get(\"halfWidth\"), 45),\n lon: toNum(q.get(\"lon\"), 0),\n lat: toNum(q.get(\"lat\"), 0),\n };\n const cmes = await getDonkiCmes(startDate, endDate);\n const ranked = cmes\n .filter((c) =>\n c.speed && c.halfWidth !== null && c.lon !== null && c.lat !== null\n )\n .map((c) => ({ ...c, score: similarity(c, target) }))\n .filter((c) => (c.score || 0) > 0.15)\n .sort((a, b) => (b.score || 0) - (a.score || 0))\n .slice(0, 30);\n return {\n generatedUTC: new Date().toISOString(),\n target,\n startDate,\n endDate,\n count: ranked.length,\n events: ranked,\n };\n}\n\nasync function readStore(): Promise {\n const url = env(\"PCAPM_STORE_URL\");\n if (!url) return [];\n const headers: HeadersInit = {};\n const token = env(\"PCAPM_STORE_TOKEN\");\n if (token) headers.authorization = `Bearer ${token}`;\n try {\n const r = await fetch(url, { headers });\n if (!r.ok) return [];\n const data = await r.json();\n return Array.isArray(data)\n ? data\n : Array.isArray(data.validations)\n ? data.validations\n : [];\n } catch {\n return [];\n }\n}\n\nasync function writeStore(points: ValidationPoint[]) {\n const url = env(\"PCAPM_STORE_URL\");\n if (!url) {\n return {\n stored: false,\n reason:\n \"PCAPM_STORE_URL not configured; returning validation payload only.\",\n };\n }\n const headers: HeadersInit = { \"content-type\": \"application/json\" };\n const token = env(\"PCAPM_STORE_TOKEN\");\n if (token) headers.authorization = `Bearer ${token}`;\n const r = await fetch(url, {\n method: \"PUT\",\n headers,\n body: JSON.stringify(points, null, 2),\n });\n return { stored: r.ok, status: r.status };\n}\n\nfunction calibrationFor(points: ValidationPoint[], q: URLSearchParams) {\n const target = {\n speed: toNum(q.get(\"speed\"), 1000),\n halfWidth: toNum(q.get(\"halfWidth\"), 45),\n lon: toNum(q.get(\"lon\"), 0),\n lat: toNum(q.get(\"lat\"), 0),\n };\n const weighted = points.map((p) => {\n const c: NormalizedCme = {\n id: p.id,\n launchTime: null,\n time21_5: null,\n sourceLocation: null,\n activeRegionNum: null,\n speed: p.speed ?? null,\n halfWidth: p.halfWidth ?? null,\n lon: p.lon ?? null,\n lat: p.lat ?? null,\n type: null,\n linkedEvents: [],\n };\n const w = similarity(c, target);\n const errorHours = hoursBetween(\n p.observedArrivalUTC,\n p.predictedArrivalUTC,\n );\n return { ...p, weight: w, errorHours };\n }).filter((p) => p.weight > 0.05 && Number.isFinite(p.errorHours));\n\n const sw = weighted.reduce((a, p) => a + p.weight, 0);\n const biasHours = sw\n ? weighted.reduce((a, p) => a + p.weight * p.errorHours, 0) / sw\n : 0;\n const maeHours = sw\n ? weighted.reduce((a, p) => a + p.weight * Math.abs(p.errorHours), 0) / sw\n : null;\n return {\n generatedUTC: new Date().toISOString(),\n target,\n validationCount: points.length,\n matchedValidationCount: weighted.length,\n recommendedBiasHours: Number(biasHours.toFixed(2)),\n recommendedUncertaintyInflationHours: maeHours === null\n ? 0\n : Number(Math.min(18, Math.max(0, maeHours * 0.5)).toFixed(2)),\n confidence: weighted.length >= 12\n ? \"good\"\n : weighted.length >= 4\n ? \"limited\"\n : \"insufficient\",\n matches: weighted.sort((a, b) => b.weight - a.weight).slice(0, 20),\n };\n}\n\nasync function handle(req: Request): Promise {\n if (req.method === \"OPTIONS\") return json({ ok: true });\n const url = new URL(req.url);\n const mode = url.searchParams.get(\"mode\") || \"live\";\n\n try {\n if (mode === \"live\") {\n return json(await cached(\"live\", CACHE_TTL_MS.live, getLive));\n }\n\n if (mode === \"history\") {\n const startDate = url.searchParams.get(\"startDate\") || daysAgo(365);\n const endDate = url.searchParams.get(\"endDate\") || dateISO(new Date());\n const key = `history:${startDate}:${endDate}:${url.search}`;\n const data = await cached(key, CACHE_TTL_MS.history, async () => {\n const cmes = await getDonkiCmes(startDate, endDate);\n return {\n generatedUTC: new Date().toISOString(),\n startDate,\n endDate,\n count: filterHistory(cmes, url.searchParams).length,\n events: filterHistory(cmes, url.searchParams),\n };\n });\n return json(data);\n }\n\n if (mode === \"similar\") 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