import assert from "node:assert/strict";
import test from "node:test";
import { readFileSync } from "node:fs";
import {
  consumeRequestRateLimit,
  consumeUserRateLimitSet,
  requestRateLimits,
  resetRequestRateLimitMaintenanceForTests,
  userRateLimitDeniedResponse,
  userRateLimitMessages,
} from "../src/lib/request-rate-limit.ts";

test("a user is allowed up to the window limit and then must wait", () => {
  const store = new Map<string, number[]>();
  const first = consumeRequestRateLimit({
    key: "search:user-1",
    limit: 2,
    windowMs: 60_000,
    now: 1_000,
    store,
  });
  const second = consumeRequestRateLimit({
    key: "search:user-1",
    limit: 2,
    windowMs: 60_000,
    now: 2_000,
    store,
  });
  const blocked = consumeRequestRateLimit({
    key: "search:user-1",
    limit: 2,
    windowMs: 60_000,
    now: 3_000,
    store,
  });
  const otherUser = consumeRequestRateLimit({
    key: "search:user-2",
    limit: 2,
    windowMs: 60_000,
    now: 3_000,
    store,
  });
  const afterWindow = consumeRequestRateLimit({
    key: "search:user-1",
    limit: 2,
    windowMs: 60_000,
    now: 61_500,
    store,
  });

  assert.deepEqual(first, { ok: true });
  assert.deepEqual(second, { ok: true });
  assert.deepEqual(blocked, { ok: false, retryAfterSeconds: 58 });
  assert.deepEqual(otherUser, { ok: true });
  assert.deepEqual(afterWindow, { ok: true });
});

test("keys past the longest seen window are swept, and a one-hour key survives 61 seconds", () => {
  resetRequestRateLimitMaintenanceForTests();
  const shortWindow = new Map<string, number[]>();
  consumeRequestRateLimit({
    key: "old",
    limit: 5,
    windowMs: 60_000,
    now: 0,
    store: shortWindow,
  });
  for (let index = 0; index < 998; index += 1) {
    consumeRequestRateLimit({
      key: `pad:${index}`,
      limit: 5,
      windowMs: 60_000,
      now: 0,
      store: shortWindow,
    });
  }
  consumeRequestRateLimit({
    key: "trigger",
    limit: 5,
    windowMs: 60_000,
    now: 61_000,
    store: shortWindow,
  });
  assert.equal(shortWindow.has("old"), false);
  assert.equal(shortWindow.get("old"), undefined);
  assert.equal(shortWindow.has("trigger"), true);
  assert.equal(shortWindow.size, 1);

  resetRequestRateLimitMaintenanceForTests();
  const mixed = new Map<string, number[]>();
  consumeRequestRateLimit({
    key: "synastry:person",
    limit: 8,
    windowMs: 60 * 60_000,
    now: 0,
    store: mixed,
  });
  consumeRequestRateLimit({
    key: "ephemeris:person",
    limit: 30,
    windowMs: 60_000,
    now: 0,
    store: mixed,
  });
  for (let index = 0; index < 998; index += 1) {
    consumeRequestRateLimit({
      key: `later:${index}`,
      limit: 5,
      windowMs: 60_000,
      now: 61_000,
      store: mixed,
    });
  }
  assert.equal(mixed.has("synastry:person"), true);
  assert.equal(mixed.has("ephemeris:person"), true);
  resetRequestRateLimitMaintenanceForTests();
});

test("consult allows 10 per minute and refuses the 11th without charging the hour bucket further", () => {
  const store = new Map<string, number[]>();
  for (let index = 0; index < 10; index += 1) {
    const decision = consumeUserRateLimitSet(
      ["consultMinute", "consultHour"],
      "person",
      1_000 + index,
      store,
    );
    assert.deepEqual(decision, { ok: true });
  }
  const denied = consumeUserRateLimitSet(["consultMinute", "consultHour"], "person", 2_000, store);
  assert.equal(denied.ok, false);
  if (!denied.ok) assert.equal(denied.retryAfterSeconds, 59);
  assert.equal(store.get("consultMinute:person")?.length, 10);
  assert.equal(store.get("consultHour:person")?.length, 10);
  assert.equal(requestRateLimits.consultMinute.limit, 10);
  assert.equal(requestRateLimits.consultHour.limit, 120);
});

test("the hour bucket can refuse while the minute bucket still has room, and neither bucket records the miss", () => {
  const store = new Map<string, number[]>();
  for (let index = 0; index < 120; index += 1) {
    consumeRequestRateLimit({
      key: "consultHour:person",
      limit: 120,
      windowMs: 60 * 60_000,
      now: index * 1_000,
      store,
    });
  }
  const denied = consumeUserRateLimitSet(["consultMinute", "consultHour"], "person", 130_000, store);
  assert.equal(denied.ok, false);
  assert.equal(store.has("consultMinute:person"), false);
  assert.equal(store.get("consultHour:person")?.length, 120);
});

test("rectification turns allow 5 per minute and 40 per hour, reports allow 3 per hour", () => {
  const store = new Map<string, number[]>();
  for (let index = 0; index < 5; index += 1) {
    assert.deepEqual(
      consumeUserRateLimitSet(["rectificationTurnMinute", "rectificationTurnHour"], "person", 5_000 + index, store),
      { ok: true },
    );
  }
  const denied = consumeUserRateLimitSet(
    ["rectificationTurnMinute", "rectificationTurnHour"],
    "person",
    5_100,
    store,
  );
  assert.equal(denied.ok, false);
  assert.equal(store.get("rectificationTurnMinute:person")?.length, 5);
  assert.equal(requestRateLimits.rectificationTurnMinute.limit, 5);
  assert.equal(requestRateLimits.rectificationTurnHour.limit, 40);
  assert.equal(requestRateLimits.reportGenerateHour.limit, 3);
  assert.equal(requestRateLimits.reportGenerateHour.windowMs, 60 * 60_000);

  const reports = new Map<string, number[]>();
  for (let index = 0; index < 3; index += 1) {
    assert.deepEqual(
      consumeUserRateLimitSet(["reportGenerateHour"], "person", 8_000 + index, reports),
      { ok: true },
    );
  }
  const reportDenied = consumeUserRateLimitSet(["reportGenerateHour"], "person", 9_000, reports);
  assert.equal(reportDenied.ok, false);
  assert.equal(reports.get("reportGenerateHour:person")?.length, 3);
});

test("a denied response carries 429, rate_limited, and Retry-After", () => {
  const denied = userRateLimitDeniedResponse(12, userRateLimitMessages.consult);
  assert.equal(denied.status, 429);
  assert.equal(denied.headers["Retry-After"], "12");
  assert.deepEqual(denied.body, {
    error: "这一会儿问得有点密，先停一下。",
    code: "rate_limited",
    retryAfterSeconds: 12,
  });
});

test("consult, rectification turns, and report creation check the limit before they reserve", () => {
  const consult = readFileSync(new URL("../src/app/api/consult/route.ts", import.meta.url), "utf8");
  const consultSettlement = readFileSync(new URL("../src/lib/consult/settlement.ts", import.meta.url), "utf8");
  const rectification = readFileSync(new URL("../src/app/api/rectification/agent/route.ts", import.meta.url), "utf8");
  const caseOpen = readFileSync(new URL("../src/app/api/rectification/cases/open/route.ts", import.meta.url), "utf8");
  const reports = readFileSync(new URL("../src/app/api/reports/route.ts", import.meta.url), "utf8");
  const reportCore = readFileSync(new URL("../src/lib/personal-report-route-core.ts", import.meta.url), "utf8");
  // 原值: route.ts 里 consumeUserRateLimitSet( 早于 reserve_consultation_usage
  // 新值: route.ts 里限额调用早于 consultSettlement.reserveCredit；RPC 名在 settlement.ts
  // 原因: 预留回调体搬进结算工厂，限额仍在开流前，顺序不跨文件拼接
  assert.ok(consult.indexOf("consumeUserRateLimitSet(") < consult.indexOf("consultSettlement.reserveCredit"));
  assert.match(consultSettlement, /rpc\("reserve_consultation_usage"/);
  assert.match(consult, /userRateLimitDeniedResponse\(/);
  assert.ok(rectification.indexOf("consumeUserRateLimitSet(") < rectification.indexOf("respondWithRectificationAgentTurn("));
  assert.equal(caseOpen.includes("consumeUserRateLimitSet"), false);
  assert.match(reports, /consumeUserRateLimitSet\(\["reportGenerateHour"\]/);
  assert.ok(reportCore.indexOf("if (deps.consumeReportRateLimit)") < reportCore.indexOf("deps.billing.reserve"));
});