Prerequisite Tree Generator

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Principia is deconstructing the fact...

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\n\n\n\n`;\n}\n\n// --- BACKEND LOGIC ---\nconst MAX_DEPTH = 3; // Prevent overly deep recursion and high costs.\nconst openai = new OpenAI();\n\ninterface Prerequisite {\n fact: string;\n justification: string;\n}\n\ninterface FactNode {\n fact: string;\n justification?: string;\n children: FactNode[];\n}\n\n/**\n * Recursively builds a tree of prerequisite facts.\n * @param {string} targetFact - The fact to deconstruct.\n * @param {number} currentDepth - The current recursion depth.\n * @returns {Promise} A node in the fact tree.\n */\nasync function buildTree(\n targetFact: string,\n currentDepth = 0,\n): Promise {\n // Base case: Max depth reached\n if (currentDepth >= MAX_DEPTH) {\n return { fact: targetFact, children: [] };\n }\n\n try {\n const completion = await openai.chat.completions.create({\n model: \"gpt-4o\",\n messages: [\n { role: \"system\", content: DECONSTRUCT_FACT_PROMPT },\n { role: \"user\", content: `{Target Fact}: \"${targetFact}\"` },\n ],\n response_format: { type: \"json_object\" },\n });\n\n const content = completion.choices[0].message.content;\n const result = JSON.parse(content);\n const prerequisites: Prerequisite[] = result.prerequisites || [];\n\n // Base case: No further prerequisites found by AI\n if (prerequisites.length === 0) {\n return { fact: targetFact, children: [] };\n }\n\n // Recursive step: Build sub-trees for each prerequisite\n const childrenPromises = prerequisites.map(async (prereq) => {\n const childNode = await buildTree(prereq.fact, currentDepth + 1);\n // Attach the justification for this child to its node data\n return { ...childNode, justification: prereq.justification };\n });\n\n const children = await Promise.all(childrenPromises);\n\n return { fact: targetFact, children: children };\n } catch (error) {\n console.error(`Error processing fact \"${targetFact}\":`, error);\n // If an AI call fails, treat it as a leaf node to avoid breaking the whole tree.\n return { fact: `${targetFact} (Error in deconstruction)`, children: [] };\n }\n}\n\nexport default async function (req: Request) {\n const url = new URL(req.url);\n\n if (req.method === \"POST\") {\n try {\n const body = await req.json();\n const rootFact = body.fact;\n\n if (\n !rootFact || typeof rootFact !== \"string\" ||\n rootFact.trim().length === 0\n ) {\n throw new Error(\"A valid fact is required.\");\n }\n\n const factTree = await buildTree(rootFact);\n\n return new Response(JSON.stringify(factTree), {\n headers: { \"Content-Type\": \"application/json\" },\n });\n } catch (error) {\n console.error(\"Main Handler Error:\", error);\n return new Response(\n JSON.stringify({\n error: error.message || \"An unknown server error occurred.\",\n }),\n {\n status: 500,\n headers: { \"Content-Type\": \"application/json\" },\n },\n );\n }\n }\n\n // Serve HTML for GET requests\n const sourceUrl = `https://${url.hostname}${url.pathname}`;\n return new Response(generateHtml(sourceUrl), {\n headers: { \"Content-Type\": \"text/html\" },\n });\n}","deleted","label","prereq",[98],"permalink","https://www.val.town/x/realtime/Prereq/code/main.ts","extension","actionData","errors"]