import * as fs from "node:fs";
import * as os from "node:os";
import * as path from "node:path";
import { afterEach, describe, expect, it } from "vitest";
import { generateAutoWiki, surveyFiles } from "./autowiki.js";

const roots: string[] = [];

afterEach(() => {
  for (const root of roots.splice(0)) fs.rmSync(root, { recursive: true, force: true });
});

function tmpRoot(): string {
  const root = fs.mkdtempSync(path.join(os.tmpdir(), "fable-autowiki-"));
  roots.push(root);
  return root;
}

describe("autowiki", () => {
  it("surveys source files without generated dirs", () => {
    const root = tmpRoot();
    fs.writeFileSync(path.join(root, "README.md"), "# Demo");
    fs.mkdirSync(path.join(root, "dist"));
    fs.writeFileSync(path.join(root, "dist", "skip.js"), "bad");

    expect(surveyFiles(root)).toEqual(["README.md"]);
  });

  it("generates index and architecture pages", () => {
    const root = tmpRoot();
    fs.writeFileSync(path.join(root, "README.md"), "# Demo");
    fs.mkdirSync(path.join(root, "src"));
    fs.writeFileSync(path.join(root, "src", "index.ts"), "export {}");

    const receipt = generateAutoWiki({ repo: root, maxFiles: 10 });

    expect(receipt.filesSurveyed).toBe(2);
    expect(receipt.pages.map((p) => path.basename(p))).toEqual(["index.md", "architecture.md"]);
    expect(fs.readFileSync(path.join(root, ".fable", "wiki", "index.md"), "utf-8")).toContain("Treat source files as evidence");
  });
});