import { mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { feedbackIdFromSeed } from "../core.ts";
import { ensureLayout, layout, loadRecords } from "../storage.ts";

const RECORD_COUNT = Number(process.env.GOOD_JOB_BENCH_RECORDS ?? 1_000);
const MINIMUM_MILLISECONDS = Number(
	process.env.GOOD_JOB_BENCH_MILLISECONDS ?? 750,
);

function record(index: number) {
	const id = feedbackIdFromSeed("praise", `bench:${index}`);
	return {
		version: 2,
		id,
		createdAt: "2026-01-01T00:00:00.000Z",
		completedAt: `2026-01-01T00:${String(index % 60).padStart(2, "0")}:00.000Z`,
		kind: "praise",
		feedback: "gj",
		source: {
			type: "session",
			cwd: "/project",
			sessionPath: "/sessions/example.jsonl",
			sessionId: "session-1",
			sessionName: null,
			leafId: "leaf-1",
			agentModel: { provider: "provider", id: "worker" },
		},
		analysisModel: { provider: "provider", id: "analyzer" },
		learning: {
			slug: `achievement-${index}`,
			summary: `Achievement ${id}`,
			evidence: ["Focused tests passed"],
			behaviors: ["Inspected callers before editing"],
			candidateRule: "Fix shared routes before leaf callers.",
		},
		usage: {
			input: 100,
			output: 50,
			cacheRead: 0,
			cacheWrite: 0,
			totalTokens: 150,
			cost: 0,
		},
	};
}

async function main(): Promise<void> {
	if (!Number.isInteger(RECORD_COUNT) || RECORD_COUNT < 1)
		throw new Error("GOOD_JOB_BENCH_RECORDS must be a positive integer");
	const root = await mkdtemp(join(tmpdir(), "good-job-bench-"));
	const paths = layout(root);
	try {
		await ensureLayout(paths);
		await Promise.all(
			Array.from({ length: RECORD_COUNT }, async (_, index) => {
				await writeFile(
					join(paths.records, `${index.toString().padStart(8, "0")}.json`),
					JSON.stringify(record(index)),
				);
			}),
		);
		const control = await loadRecords(paths);
		if (control.records.length !== RECORD_COUNT || control.errors.length !== 0)
			throw new Error("benchmark fixture failed control load");

		let iterations = 1;
		let elapsed = 0;
		const minimumNanoseconds = MINIMUM_MILLISECONDS * 1_000_000;
		do {
			const start = process.hrtime.bigint();
			for (let index = 0; index < iterations; index++) {
				const loaded = await loadRecords(paths);
				if (
					loaded.records.length !== RECORD_COUNT ||
					loaded.errors.length !== 0
				)
					throw new Error("loadRecords returned an invalid result");
			}
			elapsed = Number(process.hrtime.bigint() - start);
			if (elapsed < minimumNanoseconds) iterations *= 2;
		} while (elapsed < minimumNanoseconds);

		console.log(
			`BenchmarkLoadRecords${RECORD_COUNT}-${process.arch}\t${iterations}\t${(elapsed / iterations).toFixed(0)} ns/op`,
		);
	} finally {
		await rm(root, { recursive: true, force: true });
	}
}

await main();