import { describe, test, expect } from "bun:test";
import { generateSeoPage, generateToolFaqs } from "../src/lib/seo/page-generator";

describe("generateSeoPage", () => {
  const base = {
    name: "Blogging",
    kind: "use-case" as const,
    brandName: "AI Stack",
    toolCount: 12,
    freeCount: 4,
    topToolNames: ["ChatGPT", "Claude", "Grammarly"],
    year: 2026,
  };

  test("生成 title / h1 / intro / faqs", () => {
    const page = generateSeoPage(base);
    expect(page.title).toContain("Best AI Tools for Blogging in 2026");
    expect(page.h1).toBe("Best AI Tools for Blogging");
    expect(page.intro).toContain("12");
    expect(page.faqs.length).toBeGreaterThanOrEqual(3);
  });

  test("description 含工具数与排序说明", () => {
    const page = generateSeoPage(base);
    expect(page.description).toContain("12");
    expect(page.description).toContain("votes");
  });

  test("FAQ 具体化：引用真实工具名", () => {
    const page = generateSeoPage(base);
    const firstAnswer = page.faqs[0].answer;
    expect(firstAnswer).toContain("ChatGPT");
  });

  test("free 数量反映到 FAQ", () => {
    const page = generateSeoPage(base);
    const freeFaq = page.faqs.find((f) => f.question.startsWith("Are there free"));
    expect(freeFaq?.answer).toContain("4");
  });

  test("use case + audience 生成交叉引用 FAQ", () => {
    const page = generateSeoPage({ ...base, audienceName: "Marketers" });
    const crossFaq = page.faqs.find((f) => f.question.toLowerCase().includes("marketer"));
    expect(crossFaq).toBeDefined();
  });

  test("零数据实体也能安全生成（无 NaN/undefined）", () => {
    const page = generateSeoPage({
      name: "Research",
      kind: "audience",
      brandName: "X",
      toolCount: 0,
    });
    expect(page.intro).not.toContain("undefined");
    expect(page.title).not.toContain("NaN");
  });
});

describe("generateToolFaqs", () => {
  test("由定价生成免费问答", () => {
    const faqs = generateToolFaqs({ name: "ChatGPT", pricing: "freemium" });
    const freeFaq = faqs.find((f) => f.question.includes("free"));
    expect(freeFaq?.answer).toContain("freemium");
  });

  test("含替代品问答", () => {
    const faqs = generateToolFaqs(
      { name: "Cursor", pricing: "freemium" },
      ["Windsurf", "Copilot"]
    );
    const altFaq = faqs.find((f) => f.question.includes("alternatives"));
    expect(altFaq?.answer).toContain("Windsurf");
  });

  test("描述自动补句号", () => {
    const faqs = generateToolFaqs({
      name: "X",
      description: "It does things",
    });
    expect(faqs[0].answer).toBe("It does things.");
  });
});