import assert from "node:assert/strict";
import { readFileSync } from "node:fs";
import test from "node:test";
import { z } from "zod";
import { createOnboardingCacheIdentity } from "../src/lib/onboarding-cache-policy.ts";
import { createOnboardingPost } from "../src/lib/onboarding-post.ts";
import {
  fallbackOnboardingPayload,
  onboardingSuggestionThemes,
  parseOnboardingPayload,
} from "../src/lib/onboarding-payload.ts";
import {
  completeProfileRow,
  StatefulOnboardingProfileRepository,
} from "./onboarding-route-fake.ts";

// Both payloads cover every consultation domain; the marker is what tells one
// profile's generated content from the other's when checking for stale leaks.
function payloadCovering(marker: string) {
  return {
    suggestions: onboardingSuggestionThemes.map((theme) => ({
      theme,
      text: `请帮我看看${theme}方向的${marker}重点。`,
    })),
  };
}

const payloadA = payloadCovering("甲组");
const payloadB = payloadCovering("乙组");

function generatedText(payload: ReturnType<typeof payloadCovering>): string {
  return JSON.stringify(payload);
}

function deferred<Value>() {
  let settle: (value: Value) => void = () => undefined;
  const promise = new Promise<Value>((resolve) => {
    settle = resolve;
  });
  return { promise, resolve: settle } as const;
}

const responseBodySchema = z.object({
  suggestions: z.array(z.object({ theme: z.string(), text: z.string() })),
  source: z.enum(["agent", "cache", "fallback", "pending"]),
}).strict();

async function responseBody(response: Response): Promise<z.infer<typeof responseBodySchema>> {
  return responseBodySchema.parse(await response.json());
}

function createPost(
  repository: StatefulOnboardingProfileRepository,
  generateText: (name: string) => Promise<string | null>,
) {
  return createOnboardingPost({
    openSession: async () => ({
      userId: repository.snapshot().id,
      authError: false,
      repository,
    }),
    generateText,
    now: () => new Date("2026-07-19T10:00:00.000Z"),
    warn: () => undefined,
  });
}

test("the safe fallback satisfies the payload schema it is meant to replace", () => {
  // The fallback is built from the domain registry, so a registry prompt that stops
  // being first-person would otherwise ship a payload the schema itself rejects.
  assert.notEqual(parseOnboardingPayload(fallbackOnboardingPayload), null);
  assert.deepEqual(
    fallbackOnboardingPayload.suggestions.map((item) => item.theme),
    [...onboardingSuggestionThemes],
  );
});

test("no onboarding surface generates or transports a greeting", () => {
  const instructions = readFileSync(new URL("../src/mastra/index.ts", import.meta.url), "utf8");
  const onboardingPrompt = instructions.slice(
    instructions.indexOf("const onboardingInstructions"),
    instructions.indexOf("const onboardingAgents"));
  const route = readFileSync(new URL("../src/app/api/onboarding/route.ts", import.meta.url), "utf8");
  const payload = readFileSync(new URL("../src/lib/onboarding-payload.ts", import.meta.url), "utf8");
  const client = readFileSync(new URL("../src/lib/onboarding-client.ts", import.meta.url), "utf8");

  // Given: the hero renders a locally composed salutation, so a generated greeting has
  // nowhere to go and must not cost tokens.
  assert.doesNotMatch(onboardingPrompt, /"greeting"/);
  assert.match(onboardingPrompt, /Do not add a greeting/);
  assert.doesNotMatch(payload, /greeting/);
  assert.doesNotMatch(client, /greeting: (?:parsed|z\.string)/);

  // And: the route names the required themes so the Agent covers the whole grid.
  assert.match(route, /onboardingSuggestionThemes/);
});

test("slow Agent generation is aborted and a terminal fallback is cached before the client deadline", async () => {
  const repository = new StatefulOnboardingProfileRepository(completeProfileRow());
  let generationAborted = false;
  const dependencies = {
    openSession: async () => ({
      userId: repository.snapshot().id,
      authError: false,
      repository,
    }),
    generateText: (_name: string, signal?: AbortSignal) => new Promise<string | null>((_resolve, reject) => {
      signal?.addEventListener("abort", () => {
        generationAborted = true;
        reject(signal.reason);
      }, { once: true });
    }),
    generationTimeoutMs: 5,
    now: () => new Date("2026-07-19T10:00:00.000Z"),
    warn: () => undefined,
  };
  const deadline = new Promise<"deadline">((resolve) => {
    setTimeout(() => resolve("deadline"), 50);
  });

  const outcome = await Promise.race([createOnboardingPost(dependencies)(), deadline]);

  assert.notEqual(outcome, "deadline");
  assert.ok(outcome instanceof Response);
  assert.equal(generationAborted, true);
  const body = await responseBody(outcome);
  assert.equal(body.source, "fallback");
  assert.deepEqual(repository.snapshot().onboarding_payload, { suggestions: body.suggestions });
});


test("detached Agent questions are rejected in favor of user-centered fallbacks", async () => {
  const repository = new StatefulOnboardingProfileRepository(completeProfileRow());
  const post = createPost(repository, async () => JSON.stringify({
    suggestions: onboardingSuggestionThemes.map((theme) => ({
      theme,
      text: `印度占星一般会从哪些因素理解${theme}？`,
    })),
  }));

  const body = await responseBody(await post());

  assert.equal(body.source, "fallback");
  assert.ok(body.suggestions.every((item) => /我/.test(item.text)));
  assert.ok(body.suggestions.every((item) => !/印度占星|一般如何|通常|哪些因素|证据层/.test(item.text)));
});

test("the home receives one question per consultation domain, never a partial set", async () => {
  // Given: the Agent answers with only the three themes the old contract required.
  const repository = new StatefulOnboardingProfileRepository(completeProfileRow());
  const post = createPost(repository, async () => JSON.stringify({
    suggestions: [
      { theme: "career", text: "请帮我看看事业方向。" },
      { theme: "marriage", text: "请帮我看看关系模式。" },
      { theme: "timing", text: "请帮我看看时机安排。" },
    ],
  }));

  // When: the partial answer crosses the payload boundary.
  const body = await responseBody(await post());

  // Then: it is rejected wholesale, and the fallback still covers every domain in order
  // so no home card is left without a question.
  assert.equal(body.source, "fallback");
  assert.deepEqual(body.suggestions.map((item) => item.theme), [...onboardingSuggestionThemes]);
});

test("a reordered set is rejected so questions cannot land under the wrong theme", async () => {
  // Given: every domain is present, but two themes are swapped against their questions.
  const repository = new StatefulOnboardingProfileRepository(completeProfileRow());
  const swapped = [...onboardingSuggestionThemes];
  [swapped[0], swapped[1]] = [swapped[1]!, swapped[0]!];
  const post = createPost(repository, async () => JSON.stringify({
    suggestions: swapped.map((theme) => ({ theme, text: `请帮我看看${theme}方向的重点。` })),
  }));

  const body = await responseBody(await post());

  assert.equal(body.source, "fallback");
  assert.deepEqual(body.suggestions.map((item) => item.theme), [...onboardingSuggestionThemes]);
});

test("PostgreSQL Date birth_date is normalized before onboarding validation", async () => {
  const repository = new StatefulOnboardingProfileRepository(completeProfileRow({
    birth_date: new Date(1990, 5, 15),
  }));
  const post = createPost(repository, async () => generatedText(payloadA));

  const response = await post();
  const body = await responseBody(response);

  assert.equal(response.status, 200);
  assert.deepEqual(body, { ...payloadA, source: "agent" });
});

test("period-only birth declaration can generate the home starter questions without a concrete minute", async () => {
  const repository = new StatefulOnboardingProfileRepository({
    ...completeProfileRow({
      birth_time: null,
      active_birth_time: null,
      birth_time_status: "reported",
    }),
    reported_birth_time: null,
    birth_time_source: "period_only",
    birth_time_period: "early_morning",
    birth_time_clue: "家人只记得凌晨或清晨",
    uncertainty_before_minutes: null,
    uncertainty_after_minutes: null,
  });
  let generationCount = 0;
  const post = createPost(repository, async () => {
    generationCount += 1;
    return generatedText(payloadA);
  });

  const response = await post();
  const body = await responseBody(response);

  assert.equal(response.status, 200);
  assert.equal(generationCount, 1);
  assert.deepEqual(body, { ...payloadA, source: "agent" });
});

test("global place with an IANA timezone can enter home before a numeric offset is resolved", async () => {
  const repository = new StatefulOnboardingProfileRepository(completeProfileRow({
    name: "jesse",
    birth_date: "1955-02-24",
    birth_time: null,
    reported_birth_time: null,
    active_birth_time: null,
    birth_time_source: "period_only",
    birth_time_period: "evening",
    birth_time_clue: "大约晚上七点左右，可能前后差四十五分钟。",
    birth_time_status: null,
    country_code: "US",
    province_code: null,
    city_code: null,
    latitude: 37.7879363,
    longitude: -122.4075201,
    timezone_offset: null,
    birth_place_label: "旧金山, 加利福尼亚州, 美国",
    timezone_id: "America/Los_Angeles",
  }));
  let generationCount = 0;
  const response = await createPost(repository, async () => {
    generationCount += 1;
    return generatedText(payloadA);
  })();

  assert.equal(response.status, 200);
  assert.equal(generationCount, 1);
});

test("stale A generation returns pending after profile B replaces its claim", async () => {
  // Given: A owns a claim whose generation remains in flight.
  const repository = new StatefulOnboardingProfileRepository(completeProfileRow());
  const generationA = deferred<string | null>();
  const generationAStarted = deferred<void>();
  const post = createPost(
    repository,
    async (name) => {
      if (name === "林遥") {
        generationAStarted.resolve();
        return generationA.promise;
      }
      return generatedText(payloadB);
    },
  );
  const responseA = post();
  await generationAStarted.promise;

  // When: the persisted profile changes to B, B claims/completes, then A finishes.
  repository.setProfile({ name: "周宁" });
  const bodyB = await responseBody(await post());
  generationA.resolve(generatedText(payloadA));
  const bodyA = await responseBody(await responseA);

  // Then: B remains cached and A is provisional, never a stale terminal payload.
  assert.deepEqual(bodyB, { ...payloadB, source: "agent" });
  assert.equal(bodyA.source, "pending");
  assert.doesNotMatch(JSON.stringify(bodyA), /甲组/);
  assert.deepEqual(repository.snapshot().onboarding_payload, payloadB);
});

test("profile B replaces profile A ready cache instead of returning A content", async () => {
  // Given: A has a ready cache, then the persisted profile changes to B.
  const identityA = createOnboardingCacheIdentity({
    name: "林遥", birthDate: "1990-06-15", birthTime: "12:30", activeBirthTime: "12:30",
    birthTimeStatus: "confirmed", countryCode: "CN", provinceCode: "110000", cityCode: "110100",
  });
  const repository = new StatefulOnboardingProfileRepository(completeProfileRow({
    onboarding_payload: payloadA,
    onboarding_version: identityA.readyVersion,
    onboarding_generated_at: "2026-07-19T09:59:00.000Z",
  }));
  repository.setProfile({ name: "周宁" });
  const post = createPost(repository, async () => generatedText(payloadB));

  // When: B requests onboarding through the real handler seam.
  const body = await responseBody(await post());

  // Then: B is generated and cached; A's ready payload is never returned.
  assert.deepEqual(body, { ...payloadB, source: "agent" });
  assert.deepEqual(repository.snapshot().onboarding_payload, payloadB);
});

test("profile B replaces profile A active pending claim instead of waiting on A", async () => {
  // Given: A has a fresh pending claim, then B changes the active birth time.
  const profile = completeProfileRow();
  const identityA = createOnboardingCacheIdentity({
    name: profile.name,
    birthDate: profile.birth_date instanceof Date
      ? profile.birth_date.toISOString().slice(0, 10)
      : profile.birth_date,
    birthTime: profile.birth_time,
    activeBirthTime: profile.active_birth_time, birthTimeStatus: profile.birth_time_status,
    countryCode: profile.country_code, provinceCode: profile.province_code, cityCode: profile.city_code,
  });
  const repository = new StatefulOnboardingProfileRepository({
    ...profile,
    onboarding_version: identityA.pendingVersion,
    onboarding_generated_at: "2026-07-19T09:59:30.000Z",
  });
  repository.setProfile({ name: "周宁", active_birth_time: "12:45" });
  let generatedFor = "";
  const post = createPost(repository, async (name) => {
    generatedFor = name;
    return generatedText(payloadB);
  });

  // When: B requests onboarding within A's TTL.
  const body = await responseBody(await post());

  // Then: B claims and completes immediately rather than receiving pending for A.
  assert.equal(generatedFor, "周宁");
  assert.deepEqual(body, { ...payloadB, source: "agent" });
});

for (const interference of [
  { name: "observed version", patch: { onboarding_version: "concurrent-version" } },
  { name: "observed timestamp", patch: { onboarding_generated_at: "2026-07-19T09:58:00.000Z" } },
] as const) {
  test(`claim loses when a concurrent writer changes the ${interference.name}`, async () => {
    // Given: another writer changes one observed CAS field just before the claim.
    const repository = new StatefulOnboardingProfileRepository(completeProfileRow({
      onboarding_version: "legacy-ready",
      onboarding_generated_at: "2026-07-19T09:59:00.000Z",
    }));
    repository.interfereBeforeNextClaim(interference.patch);
    let generationCount = 0;
    const post = createPost(repository, async () => {
      generationCount += 1;
      return generatedText(payloadA);
    });

    // When: the handler attempts its observed-row claim.
    const body = await responseBody(await post());

    // Then: compare-and-set loses provisionally and generation never starts.
    assert.equal(body.source, "pending");
    assert.equal(generationCount, 0);
  });
}