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Tana Tools - Val Town HTTP handler\n// Endpoints:\n// POST /recur - Generate recurring event instances from a prototype node\n\nconst TANA_BASE_URL = \"https://tana.nicobaier.com\";\nconst TANA_TOKEN = Deno.env.get(\"API_TOKEN\");\n\n// Schema IDs (Experiments workspace)\nconst SCHEMA = {\n tags: {\n event: \"q5Xr5twOqyhg\",\n recurringEvent: \"maQzi2c82oA0\",\n },\n fields: {\n date: \"8-wJdbYsFqro\",\n recurringSource: \"YLWUSTEyQBeO\",\n recurrence: \"di6XLxxf21Kk\",\n recurUntil: \"Zm0ztONagzj_\",\n },\n};\n\n// ── Tana API helpers ──────────────────────────────────────────\n\nasync function tanaGet(path: string): Promise {\n const res = await fetch(`${TANA_BASE_URL}${path}`, {\n headers: {\n Authorization: `Bearer ${TANA_TOKEN}`,\n Accept: \"application/json\",\n },\n });\n if (!res.ok) {\n throw new Error(`Tana API error: ${res.status} ${await res.text()}`);\n }\n return res.json();\n}\n\nasync function tanaImport(parentNodeId: string, content: string): Promise {\n const res = await fetch(`${TANA_BASE_URL}/nodes/${parentNodeId}/import`, {\n method: \"POST\",\n headers: {\n Authorization: `Bearer ${TANA_TOKEN}`,\n \"Content-Type\": \"application/json\",\n },\n body: JSON.stringify({ content }),\n });\n if (!res.ok) {\n throw new Error(`Tana import error: ${res.status} ${await res.text()}`);\n }\n return res.json();\n}\n\n// ── Date helpers ──────────────────────────────────────────────\n\nfunction parseMarkdownDate(dateStr: string): Date | null {\n // Handles formats like \"Wed, Feb 18\" or \"Wed, Mar 11\"\n const cleaned = dateStr.trim();\n\n // Parse \"Day, Mon DD\" format manually first\n const months: Record = {\n Jan: 0, Feb: 1, Mar: 2, Apr: 3, May: 4, Jun: 5,\n Jul: 6, Aug: 7, Sep: 8, Oct: 9, Nov: 10, Dec: 11,\n };\n\n // Match patterns like \"Wed, Feb 18\" or \"Feb 18\"\n const match = cleaned.match(/(?:\\w+,\\s+)?(\\w{3})\\s+(\\d{1,2})/);\n if (match && months[match[1]] !== undefined) {\n const month = months[match[1]];\n const day = parseInt(match[2]);\n const year = new Date().getFullYear();\n return new Date(year, month, day);\n }\n\n // Fallback: try ISO format directly (e.g., \"2026-02-18\")\n const iso = new Date(cleaned);\n if (!isNaN(iso.getTime())) return iso;\n\n return null;\n}\n\nfunction toISODate(date: Date): string {\n const y = date.getFullYear();\n const m = String(date.getMonth() + 1).padStart(2, \"0\");\n const d = String(date.getDate()).padStart(2, \"0\");\n return `${y}-${m}-${d}`;\n}\n\nfunction addInterval(date: Date, recurrence: string): Date {\n const next = new Date(date);\n switch (recurrence) {\n case \"daily\":\n next.setDate(next.getDate() + 1);\n break;\n case \"weekly\":\n next.setDate(next.getDate() + 7);\n break;\n case \"biweekly\":\n next.setDate(next.getDate() + 14);\n break;\n case \"monthly\":\n next.setMonth(next.getMonth() + 1);\n break;\n case \"yearly\":\n next.setFullYear(next.getFullYear() + 1);\n break;\n default:\n throw new Error(`Unknown recurrence: ${recurrence}`);\n }\n return next;\n}\n\nfunction generateDateSeries(\n startDate: Date,\n endDate: Date,\n recurrence: string,\n): Date[] {\n const dates: Date[] = [];\n let current = new Date(startDate);\n\n while (current <= endDate) {\n dates.push(new Date(current));\n current = addInterval(current, recurrence);\n }\n\n return dates;\n}\n\n// ── Markdown parser ───────────────────────────────────────────\n\ninterface PrototypeData {\n name: string;\n nodeId: string;\n startDate: Date;\n recurUntil: Date;\n recurrence: string;\n}\n\nfunction parsePrototypeMarkdown(markdown: string, nodeId: string): PrototypeData {\n const lines = markdown.split(\"\\n\");\n\n // Extract name from first line: \"- Meeting Every Wednesday #recurring-event \"\n const nameMatch = lines[0]?.match(/^-\\s+(.+?)\\s+#recurring-event/);\n const name = nameMatch?.[1] ?? \"Unnamed Event\";\n\n // Extract field values\n let startDate: Date | null = null;\n let recurUntil: Date | null = null;\n let recurrence: string | null = null;\n\n for (const line of lines) {\n const trimmed = line.trim();\n\n // Date field: \"- **date**: Wed, Feb 18 \"\n if (trimmed.match(/^-\\s+\\*\\*date\\*\\*:/)) {\n const dateStr = trimmed\n .replace(/^-\\s+\\*\\*date\\*\\*:/, \"\")\n .replace(//g, \"\")\n .trim();\n startDate = parseMarkdownDate(dateStr);\n }\n\n // Recur-until field: \"- **recur-until**: Wed, Mar 11 \"\n if (trimmed.match(/^-\\s+\\*\\*recur-until\\*\\*:/)) {\n const dateStr = trimmed\n .replace(/^-\\s+\\*\\*recur-until\\*\\*:/, \"\")\n .replace(//g, \"\")\n .trim();\n recurUntil = parseMarkdownDate(dateStr);\n }\n\n // Recurrence field: \"- **recurrence**: [weekly](tana:...)\"\n if (trimmed.match(/^-\\s+\\*\\*recurrence\\*\\*:/)) {\n const recMatch = trimmed.match(/\\[(\\w+)\\]/);\n recurrence = recMatch?.[1] ?? null;\n }\n }\n\n if (!startDate) throw new Error(\"Could not parse start date from prototype\");\n if (!recurUntil) throw new Error(\"Could not parse recur-until date from prototype\");\n if (!recurrence) throw new Error(\"Could not parse recurrence from prototype\");\n\n return { name, nodeId, startDate, recurUntil, recurrence };\n}\n\n// ── Tana Paste generator ──────────────────────────────────────\n\nfunction generateTanaPaste(prototype: PrototypeData, dates: Date[]): string {\n return dates\n .map(\n (date) =>\n `- ${prototype.name} #event\\n` +\n ` - date:: [[date:${toISODate(date)}]]\\n` +\n ` - recurring-source:: [[^${prototype.nodeId}]]`,\n )\n .join(\"\\n\");\n}\n\n// ── Route: POST /recur ────────────────────────────────────────\n\nasync function handleRecur(req: Request): Promise {\n const body = await req.json();\n const { nodeId } = body;\n\n if (!nodeId) {\n return Response.json({ error: \"nodeId is required\" }, { status: 400 });\n }\n\n // 1. Read the prototype node\n const node = await tanaGet(`/nodes/${nodeId}?maxDepth=2`);\n const prototype = parsePrototypeMarkdown(node.markdown, nodeId);\n\n // 2. Generate the date series\n const dates = generateDateSeries(\n prototype.startDate,\n prototype.recurUntil,\n prototype.recurrence,\n );\n\n if (dates.length === 0) {\n return Response.json(\n { error: \"No dates generated — check start date and recur-until\" },\n { status: 400 },\n );\n }\n\n // 3. Build Tana Paste content\n const tanaPaste = generateTanaPaste(prototype, dates);\n\n // 4. 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Code