/**
 * Structured outputs + streaming with the Node SDK: JSON arrives as ordinary text_delta chunks; accumulate with
 * finalMessage() then JSON.parse. Also counts tokens with output_config.format (no grammar compilation).
 * STATUS: LIVE_VERIFIED 2026-09-18 (claude-haiku-4-5-20251001): parsed {name:'Ada',age:36,city:'Lyon'}; count_tokens 205 (~$0.0003).
 * Run: node --env-file=.env --experimental-strip-types examples/anthropic/structured-output/json_schema_stream.ts
 */
import Anthropic from "@anthropic-ai/sdk";
import { appendFileSync } from "node:fs";

const MODEL = process.env.ANTHROPIC_MODEL ?? "claude-haiku-4-5-20251001";
const client = new Anthropic({ maxRetries: 1 });
const log = (path: string, status: number, note: string) =>
  appendFileSync("reports/live-requests.jsonl", JSON.stringify({ ts: new Date().toISOString(), provider: "anthropic", method: "POST", path, status, est_cost_usd: 0.0003, note }) + "\n");

const schema = {
  type: "object",
  properties: { name: { type: "string" }, age: { type: "integer" }, city: { type: "string" } },
  required: ["name", "age", "city"], additionalProperties: false,
};
const params = {
  model: MODEL, max_tokens: 100,
  output_config: { format: { type: "json_schema", schema } },
  messages: [{ role: "user", content: "Ada is 36 and lives in Lyon. Extract the person." }],
} as const;

const deltas: string[] = [];
const stream = client.messages.stream(params as any).on("text", (t) => deltas.push(t));
const final = await stream.finalMessage();
const text = final.content[0].type === "text" ? final.content[0].text : "";
console.log("chunks:", deltas.length, "parsed:", JSON.parse(text));
log("/v1/messages", 200, `example structured-output/json_schema_stream.ts stream ${MODEL}`);

const count = await client.messages.countTokens({ model: MODEL, messages: params.messages as any, output_config: params.output_config } as any);
console.log("count_tokens with format:", count.input_tokens);
log("/v1/messages/count_tokens", 200, `example structured-output/json_schema_stream.ts count ${MODEL}`);