// Unit tests for the relay provider's shared response handling and the
// operator-call helpers introduced by the dedup refactor
// (handleRelayResponse / operatorPost / operatorGet). The relay is
// network-dependent, so we stub global.fetch. These nail:
//   - the tts error-path control flow, which must THROW, not fall through
//     to the binary arrayBuffer read (regression for the missing-return fix);
//   - handleRelayResponse's envelope parsing + the recordRelayError-only-
//     when-no-envelope rule;
//   - the deliberate throw-vs-null split between operatorPost (writes) and
//     operatorGet (reads), including the missing-config branch.

import { test, describe, afterEach } from "node:test";
import assert from "node:assert/strict";

import {
  createRelayProvider,
  setRelayUserTier,
  getRelayUserTier,
  createRelayTierInvoice,
  getRelayTierPlans,
  getRelayExpiringSubscriptions,
} from "../providers/relay.js";
import { getRelayState, resetRelayState } from "../relay-state.js";
import { getRelayOperatorKey } from "../relay-default.js";

const BASE = "https://relay.recaps.cc";

// Pin an operator key so the operator-helper tests exercise the configured
// path. node --test isolates each test file in its own process, so this
// doesn't leak into other suites.
process.env.RECAP_RELAY_OPERATOR_KEY = "test-op-key";

const realFetch = global.fetch;
let fetchCalls = [];

// Install a stub that records calls and returns (or runs) the given response.
function stubFetch(response) {
  fetchCalls = [];
  global.fetch = async (url, opts) => {
    fetchCalls.push({ url: String(url), opts });
    return typeof response === "function" ? response(url, opts) : response;
  };
}

afterEach(() => {
  global.fetch = realFetch;
  resetRelayState();
});

// Minimal Response-like stubs covering the surfaces the provider touches.
function jsonRes({ ok = true, status = 200, body = {} }) {
  return { ok, status, text: async () => JSON.stringify(body), json: async () => body };
}
function textRes({ ok = false, status = 502, body = "Bad Gateway" }) {
  return {
    ok,
    status,
    text: async () => body,
    json: async () => {
      throw new SyntaxError("not json");
    },
  };
}
function binRes({ headers = {}, bytes = [1, 2, 3] }) {
  return {
    ok: true,
    status: 200,
    headers: new Headers(headers),
    arrayBuffer: async () => new Uint8Array(bytes).buffer,
  };
}

const provider = () => createRelayProvider({ baseURL: BASE, installId: "test-install" });
// A never-aborting signal so tts skips its 90s AbortSignal.timeout fallback.
const noTimeout = () => new AbortController().signal;

describe("relay tts: error path throws (regression for the missing-return fix)", () => {
  test("throws on a non-OK response instead of falling through to the binary read", async () => {
    stubFetch(jsonRes({ ok: false, status: 500, body: { error: "kokoro busy" } }));
    await assert.rejects(
      () => provider().tts({ text: "hi", voice: "bm_george", signal: noTimeout() }),
      (err) => {
        assert.equal(err.status, 500);
        assert.equal(err.message, "Relay /relay/tts 500: kokoro busy");
        assert.deepEqual(err.envelope, { error: "kokoro busy" });
        return true;
      }
    );
  });

  test("harvests the credit envelope on a parsed error, records NO relay error", async () => {
    stubFetch(jsonRes({ ok: false, status: 402, body: { error: "out of credits", credits_remaining: 0 } }));
    await assert.rejects(() => provider().tts({ text: "x", voice: "v", signal: noTimeout() }));
    const state = getRelayState("inst:test-install");
    assert.equal(state.creditsRemaining, 0); // updateRelayState ran off the envelope
    assert.equal(state.lastError, null); //     recordRelayError did NOT (envelope present)
  });

  test("records a relay error when the error body is not JSON", async () => {
    stubFetch(textRes({ ok: false, status: 502, body: "Bad Gateway" }));
    await assert.rejects(
      () => provider().tts({ text: "x", voice: "v", signal: noTimeout() }),
      (err) => {
        assert.equal(err.status, 502);
        assert.equal(err.message, "Relay /relay/tts 502: Bad Gateway");
        return true;
      }
    );
    assert.equal(getRelayState("inst:test-install").lastError, "Bad Gateway");
  });

  test("success path returns binary audio and never enters the error branch", async () => {
    stubFetch(
      binRes({
        headers: {
          "Content-Type": "audio/mpeg",
          "X-Recap-Credits-Remaining": "7",
          "X-Recap-Tier": "pro",
          "X-Recap-Credit-Charged": "1",
          "X-Recap-Audio-Duration": "12.5",
        },
        bytes: [10, 20, 30],
      })
    );
    const out = await provider().tts({ text: "hi", voice: "bm_george", signal: noTimeout() });
    assert.ok(Buffer.isBuffer(out.audio));
    assert.equal(out.audio.length, 3);
    assert.equal(out.contentType, "audio/mpeg");
    assert.equal(out.creditCharged, 1);
    assert.equal(out.durationSeconds, 12.5);
    const state = getRelayState("inst:test-install");
    assert.equal(state.creditsRemaining, 7);
    assert.equal(state.tier, "pro");
  });
});

describe("operatorPost (writes — throw on failure)", () => {
  test("setRelayUserTier POSTs the right URL/headers/body and returns data on OK", async () => {
    stubFetch(jsonRes({ ok: true, body: { ok: true, tier: "max" } }));
    const data = await setRelayUserTier({ userId: "u1", tier: "max", expiresAt: "2026-09-01T00:00:00Z" });
    assert.deepEqual(data, { ok: true, tier: "max" });
    assert.equal(fetchCalls.length, 1);
    const { url, opts } = fetchCalls[0];
    assert.equal(url, `${BASE}/relay/user-tier`);
    assert.equal(opts.method, "POST");
    assert.equal(opts.headers["Content-Type"], "application/json");
    assert.equal(opts.headers["X-Recap-Operator-Key"], "test-op-key");
    assert.deepEqual(JSON.parse(opts.body), {
      user_id: "u1",
      tier: "max",
      expires_at: "2026-09-01T00:00:00Z",
    });
  });

  test("omits undefined body keys (expires_at) via JSON.stringify", async () => {
    stubFetch(jsonRes({ ok: true, body: {} }));
    await setRelayUserTier({ userId: "u1", tier: "pro" }); // expiresAt defaults null → undefined
    assert.deepEqual(JSON.parse(fetchCalls[0].opts.body), { user_id: "u1", tier: "pro" });
  });

  test("throws with .status and the relay's error message on a non-OK response", async () => {
    stubFetch(jsonRes({ ok: false, status: 409, body: { error: "already granted" } }));
    await assert.rejects(
      () => setRelayUserTier({ userId: "u1", tier: "max" }),
      (err) => {
        assert.equal(err.status, 409);
        assert.equal(err.message, "already granted");
        return true;
      }
    );
  });

  test("falls back to '<label> <status>' when the error body has no .error", async () => {
    stubFetch(jsonRes({ ok: false, status: 500, body: {} }));
    await assert.rejects(
      () => createRelayTierInvoice({ userId: "u1", tier: "pro" }),
      (err) => {
        assert.equal(err.message, "relay tier-invoice 500");
        return true;
      }
    );
  });
});

describe("operatorGet (reads — null on failure)", () => {
  test("getRelayTierPlans returns parsed JSON on OK", async () => {
    stubFetch(jsonRes({ ok: true, body: { period_days: 30, plans: [{ tier: "pro", sats: 1000 }] } }));
    assert.deepEqual(await getRelayTierPlans(), {
      period_days: 30,
      plans: [{ tier: "pro", sats: 1000 }],
    });
    assert.equal(fetchCalls[0].url, `${BASE}/relay/tier-plans`);
    assert.equal(fetchCalls[0].opts.headers["X-Recap-Operator-Key"], "test-op-key");
  });

  test("getRelayTierPlans returns null on a non-OK response", async () => {
    stubFetch(jsonRes({ ok: false, status: 503, body: { error: "down" } }));
    assert.equal(await getRelayTierPlans(), null);
  });

  test("getRelayTierPlans returns null when fetch rejects (network error)", async () => {
    stubFetch(() => {
      throw new TypeError("fetch failed");
    });
    assert.equal(await getRelayTierPlans(), null);
  });

  test("getRelayUserTier percent-encodes the user id into the path", async () => {
    stubFetch(jsonRes({ ok: true, body: { tier: "max" } }));
    assert.deepEqual(await getRelayUserTier({ userId: "user/with space" }), { tier: "max" });
    assert.equal(fetchCalls[0].url, `${BASE}/relay/user-tier/user%2Fwith%20space`);
  });

  test("getRelayExpiringSubscriptions builds the within_days/lapsed_days query", async () => {
    stubFetch(jsonRes({ ok: true, body: { subscriptions: [] } }));
    await getRelayExpiringSubscriptions({ withinDays: 5, lapsedDays: 2 });
    const u = new URL(fetchCalls[0].url);
    assert.equal(u.pathname, "/relay/expiring-subscriptions");
    assert.equal(u.searchParams.get("within_days"), "5");
    assert.equal(u.searchParams.get("lapsed_days"), "2");
  });
});

describe("operator helpers: missing-config contract (write throws, read returns null)", () => {
  test("same misconfig → setRelayUserTier throws, getRelayTierPlans returns null, no fetch", async (t) => {
    const saved = process.env.RECAP_RELAY_OPERATOR_KEY;
    delete process.env.RECAP_RELAY_OPERATOR_KEY;
    try {
      if (getRelayOperatorKey()) {
        t.skip("operator key resolved from config.js in this env — can't exercise the missing-key path");
        return;
      }
      stubFetch(() => {
        throw new Error("fetch must not be called when the operator key is absent");
      });
      await assert.rejects(() => setRelayUserTier({ userId: "u1", tier: "pro" }), /operator key not configured/);
      assert.equal(await getRelayTierPlans(), null);
      assert.equal(fetchCalls.length, 0);
    } finally {
      process.env.RECAP_RELAY_OPERATOR_KEY = saved;
    }
  });
});