import { describe, it, expect, vi, beforeEach } from "vitest";
import { createWhatsAppTrial } from "../src/channels/whatsapp/trial.js";
import type { Db } from "../src/db/db.js";
import type { ConversationMemory } from "../src/ai/memory/memory.js";
import type { NocoProvisioner } from "../src/integrations/nocodb/provision.js";

function makeProvisioner(
  accounts: { id: number; username: string }[] = [],
) {
  const probeExisting = vi.fn(async () => accounts);
  const provisionTrial = vi.fn(async () => ({
    ok: true,
    username: "abc123",
    password: "pw",
    message: "ok",
  }));
  return {
    probeExisting,
    provisionTrial,
  } as unknown as NocoProvisioner & {
    probeExisting: ReturnType<typeof vi.fn>;
    provisionTrial: ReturnType<typeof vi.fn>;
  };
}

function makeTrial(provisioner?: NocoProvisioner) {
  const db = {
    getOrCreateUserId: vi.fn(async () => 1),
  } as unknown as Db;
  const memory = {
    recall: vi.fn(async () => undefined),
    remember: vi.fn(async () => {}),
    recallAll: vi.fn(async () => ({})),
  } as unknown as ConversationMemory;
  const logger = { info: vi.fn(), warn: vi.fn(), error: vi.fn() } as never;
  const trial = createWhatsAppTrial({ db, memory, provisioner, logger });
  return { trial, db, memory };
}

describe("createWhatsAppTrial", () => {
  beforeEach(() => vi.clearAllMocks());

  it("starts the flow from a paid SKU with trial intent, asking for username (0 accounts)", async () => {
    const prov = makeProvisioner();
    const { trial } = makeTrial(prov);
    const reply = await trial.handleMessage("I want try this CZH03", "60103181872");
    expect(reply).toContain("FREECZH03");
    expect(reply).toContain("username");
    expect(prov.probeExisting).toHaveBeenCalledWith({ telegramUserId: "60103181872" });
  });

  it("starts the flow from a bare FREE-prefixed SKU", async () => {
    const { trial } = makeTrial(makeProvisioner());
    const reply = await trial.handleMessage("FreeCZH03", "60103181872");
    expect(reply).toContain("FREECZH03");
  });

  it("starts the flow from a product-page URL", async () => {
    const { trial } = makeTrial(makeProvisioner());
    const reply = await trial.handleMessage(
      "I want try https://www.digikedai.com/products/czh03",
      "60103181872",
    );
    expect(reply).toContain("FREECZH03");
  });

  it("asks which SKU/URL when trial intent has no SKU", async () => {
    const { trial } = makeTrial(makeProvisioner());
    const reply = await trial.handleMessage("I want to try the baking course", "60103181872");
    expect(reply).toContain("SKU");
    expect(reply).toContain("digikedai.com/products");
  });

  it("confirms reuse for a single existing account, then provisions to it", async () => {
    const prov = makeProvisioner([{ id: 7, username: "lover" }]);
    const { trial } = makeTrial(prov);
    const r1 = await trial.handleMessage("I want try CZH03", "60103181872");
    expect(r1).toContain("lover");

    const r2 = await trial.handleMessage("ok", "60103181872");
    expect(prov.provisionTrial).toHaveBeenCalledWith(
      expect.objectContaining({ customerId: 7, sku: "FREECZH03" }),
    );
    expect(r2).toContain("abc123");
  });

  it("lists multiple accounts and defaults to the first on consent", async () => {
    const prov = makeProvisioner([
      { id: 7, username: "lover" },
      { id: 9, username: "other" },
    ]);
    const { trial } = makeTrial(prov);
    const r1 = await trial.handleMessage("FreeCZH03", "60103181872");
    expect(r1).toContain("1. lover");
    expect(r1).toContain("2. other");

    const r2 = await trial.handleMessage("ok", "60103181872");
    expect(prov.provisionTrial).toHaveBeenCalledWith(
      expect.objectContaining({ customerId: 7 }),
    );
    expect(r2).toContain("abc123");
  });

  it("picks the numbered account when given an index", async () => {
    const prov = makeProvisioner([
      { id: 7, username: "lover" },
      { id: 9, username: "other" },
    ]);
    const { trial } = makeTrial(prov);
    await trial.handleMessage("FreeCZH03", "60103181872");
    await trial.handleMessage("2", "60103181872");
    expect(prov.provisionTrial).toHaveBeenCalledWith(
      expect.objectContaining({ customerId: 9 }),
    );
  });

  it("provisions a new account with the supplied username", async () => {
    const prov = makeProvisioner();
    const { trial } = makeTrial(prov);
    await trial.handleMessage("I want try CZH03", "60103181872");
    const r2 = await trial.handleMessage("abc123", "60103181872");
    expect(prov.provisionTrial).toHaveBeenCalledWith(
      expect.objectContaining({ username: "abc123", sku: "FREECZH03" }),
    );
    expect(r2).toContain("abc123");
  });

  it("lets a non-trial SKU question fall through to the LLM", async () => {
    const { trial } = makeTrial(makeProvisioner());
    const reply = await trial.handleMessage("CZH03 多少钱", "60103181872");
    expect(reply).toBeUndefined();
  });

  it("degrades to the username form when no provisioner is configured", async () => {
    const { trial } = makeTrial(undefined);
    const reply = await trial.handleMessage("I want try CZH03", "60103181872");
    expect(reply).toContain("username");
  });
});