import { test } from "node:test";
import assert from "node:assert/strict";
import {
  parseRetryAfterHeader,
  detectTestKind,
  extractProviderErrorMessage,
  resolveModelTestTimeoutMs,
} from "@/lib/api/modelTestRunner.ts";

// ---------------------------------------------------------------------------
// parseRetryAfterHeader — Retry-After is either delta-seconds or an HTTP-date.
// Regression guard for the rate-limit handling in runSingleModelTest (#3267).
// ---------------------------------------------------------------------------

test("parseRetryAfterHeader returns undefined for missing/empty/null input", () => {
  assert.equal(parseRetryAfterHeader(null), undefined);
  assert.equal(parseRetryAfterHeader(undefined), undefined);
  assert.equal(parseRetryAfterHeader(""), undefined);
  assert.equal(parseRetryAfterHeader("   "), undefined);
});

test("parseRetryAfterHeader parses delta-seconds (numeric form)", () => {
  assert.equal(parseRetryAfterHeader("0"), 0);
  assert.equal(parseRetryAfterHeader("30"), 30);
  assert.equal(parseRetryAfterHeader("120"), 120);
  // fractional seconds round up (ceil) so we never under-wait
  assert.equal(parseRetryAfterHeader("1.2"), 2);
});

test("parseRetryAfterHeader rejects non-date garbage and never yields a misleading positive wait", () => {
  // Pure garbage with no parseable date → undefined.
  assert.equal(parseRetryAfterHeader("soon"), undefined);
  assert.equal(parseRetryAfterHeader("NaN"), undefined);
  // A negative numeric is not accepted on the numeric path (>= 0 guard); it
  // falls through to Date.parse, which yields a past date → clamped to 0.
  // The important guarantee is that it never produces a positive wait.
  const negative = parseRetryAfterHeader("-5");
  assert.ok(negative === undefined || negative === 0, `expected 0/undefined, got ${negative}`);
});

test("parseRetryAfterHeader parses an HTTP-date into a non-negative seconds delta", () => {
  // A date ~10s in the future should yield a small positive integer (>=0).
  const future = new Date(Date.now() + 10_000).toUTCString();
  const secs = parseRetryAfterHeader(future);
  assert.ok(typeof secs === "number");
  assert.ok(secs >= 0 && secs <= 11, `expected ~10s, got ${secs}`);

  // A date in the past clamps to 0 (never negative).
  const past = new Date(Date.now() - 60_000).toUTCString();
  assert.equal(parseRetryAfterHeader(past), 0);
});

// ---------------------------------------------------------------------------
// detectTestKind — picks the right test endpoint (chat / embeddings / rerank)
// from the model id + custom-model metadata. Rerank must win over embedding.
// ---------------------------------------------------------------------------

test("detectTestKind defaults to a plain chat test for ordinary models", () => {
  assert.deepEqual(detectTestKind("openai/gpt-4o", null), {
    isRerank: false,
    isEmbedding: false,
  });
});

test("detectTestKind detects embeddings by id heuristics", () => {
  for (const id of [
    "openai/text-embedding-3-small",
    "jina/jina-embeddings-v3",
    "baai/bge-m3",
    "jinaai/jina-clip-v2",
    "colbert-ir/colbertv2",
  ]) {
    assert.equal(detectTestKind(id, null).isEmbedding, true, `${id} should be embedding`);
    assert.equal(detectTestKind(id, null).isRerank, false, `${id} should not be rerank`);
  }
});

test("detectTestKind detects rerank by id and by metadata, and rerank wins over embedding", () => {
  assert.deepEqual(detectTestKind("jina/jina-reranker-v2", null), {
    isRerank: true,
    isEmbedding: false,
  });
  // apiFormat metadata drives detection even when the id is opaque
  assert.equal(detectTestKind("vendor/opaque-model", { apiFormat: "rerank" }).isRerank, true);
  assert.equal(
    detectTestKind("vendor/opaque-model", { supportedEndpoints: ["embeddings"] }).isEmbedding,
    true
  );
  // A model that looks like both rerank and embedding resolves to rerank only.
  const both = detectTestKind("vendor/rerank-embedding-hybrid", null);
  assert.equal(both.isRerank, true);
  assert.equal(both.isEmbedding, false);
});

test("extractProviderErrorMessage includes upstream details when generic error is unhelpful", () => {
  const body = {
    error: { message: "HuggingChat returned HTTP 500" },
    upstream_details: {
      message: "Model is temporarily overloaded",
      status: "error",
    },
  };

  assert.equal(
    extractProviderErrorMessage(body, "Internal Server Error"),
    "HuggingChat returned HTTP 500: Model is temporarily overloaded"
  );
});

test("resolveModelTestTimeoutMs extends Dola Pro model checks", () => {
  assert.equal(resolveModelTestTimeoutMs("doubao-web", "dola-pro", 10_000), 90_000);
  assert.equal(resolveModelTestTimeoutMs("doubao-web", "doubao-web/dola-pro", 10_000), 90_000);
  assert.equal(resolveModelTestTimeoutMs("DOUBAO-WEB", "dola-pro", 120_000), 120_000);
});

test("resolveModelTestTimeoutMs leaves ordinary models unchanged", () => {
  assert.equal(resolveModelTestTimeoutMs("doubao-web", "dola-speed", 10_000), 10_000);
  assert.equal(resolveModelTestTimeoutMs("openai", "dola-pro", 10_000), 10_000);
});