interface TimingSample {
  label: string;
  method: string;
  url: string;
  ok: boolean;
  status: number;
  durationMs: number;
  bytes: number;
  error: string | null;
}

export {};

function envNumber(name: string, fallback: number): number {
  const raw = process.env[name];
  if (raw === undefined || raw.length === 0) return fallback;
  const value = Number(raw);
  if (!Number.isFinite(value) || value <= 0) throw new Error(`${name} must be a positive number`);
  return Math.floor(value);
}

function baseUrl(): string {
  return (process.env.CI_CODE_QUEUE_URL ?? "http://code-queue-ci-read.unidesk-ci.svc.cluster.local:4222").replace(/\/+$/u, "");
}

async function fetchSample(label: string, url: string, timeoutMs = 30_000): Promise<TimingSample> {
  const started = performance.now();
  try {
    const response = await fetch(url, { signal: AbortSignal.timeout(timeoutMs) });
    const text = await response.text();
    return {
      label,
      method: "GET",
      url,
      ok: response.ok,
      status: response.status,
      durationMs: Math.round((performance.now() - started) * 10) / 10,
      bytes: text.length,
      error: null,
    };
  } catch (error) {
    return {
      label,
      method: "GET",
      url,
      ok: false,
      status: 0,
      durationMs: Math.round((performance.now() - started) * 10) / 10,
      bytes: 0,
      error: error instanceof Error ? error.message : String(error),
    };
  }
}

function percentile(values: number[], percentileValue: number): number {
  if (values.length === 0) return 0;
  const sorted = values.slice().sort((left, right) => left - right);
  if (percentileValue <= 0) return sorted[0] ?? 0;
  if (percentileValue >= 100) return sorted[sorted.length - 1] ?? 0;
  const index = Math.min(sorted.length - 1, Math.max(0, Math.ceil((percentileValue / 100) * sorted.length) - 1));
  return sorted[index] ?? 0;
}

async function candidateTaskIds(url: string): Promise<string[]> {
  const response = await fetch(`${url}/api/tasks/overview?limit=24&transcriptLimit=0&compact=1&selected=1&includeActive=0&stats=0&skipTrace=1`, {
    signal: AbortSignal.timeout(30_000),
  });
  const body = await response.json() as { selected?: { task?: { id?: string } }; tasks?: Array<{ id?: string }> };
  const ids = [
    body.selected?.task?.id,
    ...(body.tasks ?? []).map((task) => task.id),
  ].filter((id): id is string => typeof id === "string" && id.length > 0);
  return [...new Set(ids)];
}

async function traceSeq(url: string, taskId: string): Promise<number | null> {
  const response = await fetch(`${url}/api/tasks/${encodeURIComponent(taskId)}/trace-steps?tail=1&limit=8`, {
    signal: AbortSignal.timeout(30_000),
  });
  const body = await response.json() as { steps?: Array<{ seq?: number }> };
  const seq = body.steps?.find((step) => Number.isFinite(Number(step.seq)))?.seq;
  if (!Number.isFinite(Number(seq))) return null;
  return Number(seq);
}

async function traceTarget(url: string): Promise<{ taskId: string; seq: number; skippedTaskIds: string[] }> {
  const ids = await candidateTaskIds(url);
  if (ids.length === 0) throw new Error("Code Queue CI perf could not find a task id in the production PostgreSQL task table");
  const skippedTaskIds: string[] = [];
  for (const taskId of ids) {
    const seq = await traceSeq(url, taskId);
    if (seq !== null) return { taskId, seq, skippedTaskIds };
    skippedTaskIds.push(taskId);
  }
  throw new Error(`Code Queue CI perf could not find a task with trace steps among ${ids.length} candidates: ${skippedTaskIds.join(",")}`);
}

async function measureFirstPaint(url: string): Promise<Record<string, unknown>> {
  const sample = await fetchSample("code-queue-read-first-paint-proxy", `${url}/api/tasks/overview?limit=12&transcriptLimit=1&compact=1&selected=0&includeActive=0&stats=0&skipTrace=1`, 60_000);
  return {
    ok: sample.ok,
    url: sample.url,
    firstPaintMs: sample.durationMs,
    apiTimings: [sample],
    consoleErrors: [],
    note: "Code Queue service is API-only in k3s; this measures the first overview payload used by the frontend Code Queue page.",
  };
}

async function main(): Promise<void> {
  const url = baseUrl();
  const budgets = {
    firstPaintMs: envNumber("FIRST_PAINT_BUDGET_MS", 2000),
    traceSummaryMs: envNumber("TRACE_SUMMARY_BUDGET_MS", 700),
    traceStepsMs: envNumber("TRACE_STEPS_BUDGET_MS", 900),
    traceStepDetailMs: envNumber("TRACE_STEP_DETAIL_BUDGET_MS", 700),
    overviewP95Ms: envNumber("OVERVIEW_P95_BUDGET_MS", 900),
  };
  const health = await fetchSample("health", `${url}/health`);
  if (!health.ok) throw new Error(`Code Queue CI read health failed: ${JSON.stringify(health)}`);
  const target = await traceTarget(url);
  const { taskId, seq } = target;
  const firstPaint = await measureFirstPaint(url);
  const traceSummary = await fetchSample("trace-summary", `${url}/api/tasks/${encodeURIComponent(taskId)}/trace-summary`);
  const traceSteps = await fetchSample("trace-steps", `${url}/api/tasks/${encodeURIComponent(taskId)}/trace-steps?tail=1&limit=20`);
  const traceStepDetail = await fetchSample("trace-step-detail", `${url}/api/tasks/${encodeURIComponent(taskId)}/trace-step?seq=${encodeURIComponent(String(seq))}`);
  const overviewSamples: TimingSample[] = [];
  for (let index = 0; index < 10; index += 1) {
    overviewSamples.push(await fetchSample("overview", `${url}/api/tasks/overview?limit=12&transcriptLimit=1&compact=1&selected=0&includeActive=0&stats=0&skipTrace=1&__ci=${Date.now()}-${index}`));
  }
  const overviewSuccessful = overviewSamples.filter((sample) => sample.ok).map((sample) => sample.durationMs);
  const overviewP95Ms = Math.round(percentile(overviewSuccessful, 95) * 10) / 10;
  const firstPaintMs = Number((firstPaint as { firstPaintMs?: number }).firstPaintMs ?? 0);
  const checks = [
    { name: "first-paint", ok: firstPaintMs <= budgets.firstPaintMs, valueMs: firstPaintMs, budgetMs: budgets.firstPaintMs },
    { name: "trace-summary", ok: traceSummary.ok && traceSummary.durationMs <= budgets.traceSummaryMs, valueMs: traceSummary.durationMs, budgetMs: budgets.traceSummaryMs },
    { name: "trace-steps", ok: traceSteps.ok && traceSteps.durationMs <= budgets.traceStepsMs, valueMs: traceSteps.durationMs, budgetMs: budgets.traceStepsMs },
    { name: "trace-step-detail", ok: traceStepDetail.ok && traceStepDetail.durationMs <= budgets.traceStepDetailMs, valueMs: traceStepDetail.durationMs, budgetMs: budgets.traceStepDetailMs },
    { name: "overview-p95", ok: overviewSamples.every((sample) => sample.ok) && overviewP95Ms <= budgets.overviewP95Ms, valueMs: overviewP95Ms, budgetMs: budgets.overviewP95Ms },
  ];
  const result = {
    ok: checks.every((check) => check.ok),
    measuredAt: new Date().toISOString(),
    url,
    taskId,
    seq,
    skippedTaskIds: target.skippedTaskIds,
    budgets,
    checks,
    health,
    firstPaint,
    traceSummary,
    traceSteps,
    traceStepDetail,
    overview: {
      p50Ms: Math.round(percentile(overviewSuccessful, 50) * 10) / 10,
      p95Ms: overviewP95Ms,
      samples: overviewSamples,
    },
  };
  console.log(JSON.stringify(result, null, 2));
  if (!result.ok) process.exitCode = 1;
}

await main();