import { afterEach, describe, expect, it } from "vitest";
import type { FastifyInstance } from "fastify";
import { mkdtemp, mkdir, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { buildApp } from "../src/app.js";
import { createThemeRegistry } from "../src/theme-registry.js";

let app: FastifyInstance | undefined;
let temporaryDirectory: string | undefined;

function localThemeManifest(
  id: string,
  overrides: Record<string, unknown> = {}
) {
  return {
    manifestVersion: 1,
    id,
    name: "本地测试主题",
    version: "local",
    description: "本地主题测试",
    author: "test",
    license: "local-only",
    entry: "theme.css",
    domPreset: "typora",
    defaultFontSize: "16px",
    supportedFeatures: ["code", "table"],
    bundled: false,
    ...overrides
  };
}

afterEach(async () => {
  await app?.close();
  if (temporaryDirectory) {
    await rm(temporaryDirectory, { recursive: true, force: true });
  }
  app = undefined;
  temporaryDirectory = undefined;
});

describe("预览 API", () => {
  it("渲染 Markdown 并返回安全文章结构", async () => {
    app = buildApp();
    const response = await app.inject({
      method: "POST",
      url: "/api/render",
      payload: {
        markdown: "# 文档\n\n<script>alert('xss')</script>"
      }
    });

    expect(response.statusCode).toBe(200);
    const result = response.json();
    expect(result.articleHtml).toContain('id="write"');
    expect(result.articleHtml).not.toContain("<script");
    expect(result.metadata.title).toBe("文档");
  });

  it("拒绝非字符串 Markdown", async () => {
    app = buildApp();
    const response = await app.inject({
      method: "POST",
      url: "/api/render",
      payload: {
        markdown: 42
      }
    });

    expect(response.statusCode).toBe(400);
    expect(response.json().error).toBe("INVALID_MARKDOWN");
  });

  it("返回内置主题 CSS", async () => {
    app = buildApp();
    const response = await app.inject({
      method: "GET",
      url: "/api/themes/typora-like/css"
    });

    expect(response.statusCode).toBe(200);
    expect(response.headers["content-type"]).toContain("text/css");
    expect(response.body).toContain("#write");
  });

  it("发现本地主题并安全提供相对字体资源", async () => {
    temporaryDirectory = await mkdtemp(join(tmpdir(), "md-to-pdf-theme-"));
    const themeDirectory = join(temporaryDirectory, "local-test");
    await mkdir(join(themeDirectory, "partials", "fonts"), {
      recursive: true
    });
    await writeFile(
      join(themeDirectory, "theme.json"),
      JSON.stringify(
        localThemeManifest("local-test", {
          base: "typora-base.css"
        })
      ),
      "utf8"
    );
    await writeFile(
      join(themeDirectory, "typora-base.css"),
      "/* base-layer */ table { width: 100%; border-collapse: collapse; }",
      "utf8"
    );
    await writeFile(
      join(themeDirectory, "theme.css"),
      [
        "@include-when-export url(https://example.com/font.css);",
        "@import \"partials/typography.css\";",
        "#write { font-family: LocalTest; }"
      ].join("\n"),
      "utf8"
    );
    await writeFile(
      join(themeDirectory, "partials", "typography.css"),
      [
        "/* imported-layer */",
        "@font-face { src: url('./fonts/test.woff2') format('woff2'); }"
      ].join("\n"),
      "utf8"
    );
    await writeFile(
      join(themeDirectory, "partials", "fonts", "test.woff2"),
      Buffer.from([0, 1, 2, 3])
    );

    app = buildApp({
      localThemeRoot: temporaryDirectory,
      logger: false
    });
    const themesResponse = await app.inject({
      method: "GET",
      url: "/api/themes"
    });
    expect(themesResponse.statusCode).toBe(200);
    expect(themesResponse.json().themes).toEqual(
      expect.arrayContaining([
        expect.objectContaining({
          id: "local-test",
          bundled: false,
          source: "local"
        })
      ])
    );

    const cssResponse = await app.inject({
      method: "GET",
      url: "/api/themes/local-test/css"
    });
    expect(cssResponse.statusCode).toBe(200);
    expect(cssResponse.body).not.toContain("@include-when-export");
    expect(cssResponse.body).toContain(
      "/api/themes/local-test/assets/partials/fonts/test.woff2"
    );
    expect(cssResponse.body.indexOf("base-layer")).toBeLessThan(
      cssResponse.body.indexOf("imported-layer")
    );
    expect(cssResponse.body.indexOf("imported-layer")).toBeLessThan(
      cssResponse.body.indexOf("font-family: LocalTest")
    );

    const assetResponse = await app.inject({
      method: "GET",
      url: "/api/themes/local-test/assets/partials/fonts/test.woff2"
    });
    expect(assetResponse.statusCode).toBe(200);
    expect(assetResponse.headers["content-type"]).toContain("font/woff2");
    expect(assetResponse.rawPayload).toEqual(Buffer.from([0, 1, 2, 3]));
  });

  it("拒绝主题 CSS 循环导入", async () => {
    temporaryDirectory = await mkdtemp(join(tmpdir(), "md-to-pdf-theme-"));
    const bundledRoot = join(temporaryDirectory, "bundled");
    const localRoot = join(temporaryDirectory, "local");
    const themeDirectory = join(localRoot, "cycle-test");
    await mkdir(bundledRoot, { recursive: true });
    await mkdir(themeDirectory, { recursive: true });
    await writeFile(
      join(themeDirectory, "theme.json"),
      JSON.stringify(localThemeManifest("cycle-test")),
      "utf8"
    );
    await writeFile(
      join(themeDirectory, "theme.css"),
      '@import "nested.css";',
      "utf8"
    );
    await writeFile(
      join(themeDirectory, "nested.css"),
      '@import "theme.css";',
      "utf8"
    );

    const registry = createThemeRegistry({ bundledRoot, localRoot });
    await expect(registry.getCss("cycle-test")).rejects.toThrow(
      "主题 CSS 存在循环引用"
    );
  });

  it("拒绝主题 CSS 导入外部地址", async () => {
    temporaryDirectory = await mkdtemp(join(tmpdir(), "md-to-pdf-theme-"));
    const bundledRoot = join(temporaryDirectory, "bundled");
    const localRoot = join(temporaryDirectory, "local");
    const themeDirectory = join(localRoot, "external-test");
    await mkdir(bundledRoot, { recursive: true });
    await mkdir(themeDirectory, { recursive: true });
    await writeFile(
      join(themeDirectory, "theme.json"),
      JSON.stringify(localThemeManifest("external-test")),
      "utf8"
    );
    await writeFile(
      join(themeDirectory, "theme.css"),
      '@import "https://example.com/theme.css";',
      "utf8"
    );

    const registry = createThemeRegistry({ bundledRoot, localRoot });
    await expect(registry.getCss("external-test")).rejects.toThrow(
      "主题 CSS 路径不安全"
    );
  });
});