import {
  assert,
  assertEquals,
  assertRejects,
  assertStringIncludes,
} from "@std/assert";
import { fromFileUrl, join } from "@std/path";
import { regenerateFavicons } from "./regenerate-favicons.ts";

Deno.test("favicon regeneration writes missing output and preserves current output", async () => {
  const directory = await Deno.makeTempDir({ prefix: "dashboard-favicons-" });
  const output = join(directory, "favicon-png.generated.ts");
  try {
    assert(await regenerateFavicons(output));
    const generated = await Deno.readTextFile(output);
    assertStringIncludes(
      generated,
      "Generated by `deno task regenerate-favicons`",
    );
    assertStringIncludes(generated, "export const FAVICON_VERSION");
    assertStringIncludes(generated, '"bad-crying": decodePng(');

    assertEquals(await regenerateFavicons(output), false);
    assertEquals(await Deno.readTextFile(output), generated);
  } finally {
    await Deno.remove(directory, { recursive: true });
  }
});

Deno.test("favicon regeneration preserves read errors", async () => {
  const directory = await Deno.makeTempDir({ prefix: "dashboard-favicons-" });
  try {
    const error = await assertRejects(() => regenerateFavicons(directory));
    assert(!(error instanceof Deno.errors.NotFound));
  } finally {
    await Deno.remove(directory, { recursive: true });
  }
});

Deno.test("favicon regeneration command verifies the committed output", async () => {
  // The command runs under the Deno running this test, not the program named
  // `deno`, which would be whichever copy comes first on `PATH`.
  const result = await new Deno.Command(Deno.execPath(), {
    args: [
      "run",
      "--allow-read",
      "--allow-ffi",
      "--allow-sys=cpus,networkInterfaces,hostname",
      "regenerate-favicons.ts",
    ],
    cwd: fromFileUrl(new URL(".", import.meta.url)),
    stdout: "piped",
    stderr: "piped",
  }).output();
  const decoder = new TextDecoder();
  assert(result.success, decoder.decode(result.stderr));
  assertEquals(
    decoder.decode(result.stdout),
    "Dashboard favicons are already up to date.\n",
  );
});