import { test } from "node:test";
import assert from "node:assert/strict";
import { mkdtempSync, writeFileSync, chmodSync, rmSync } from "node:fs";
import { join } from "node:path";
import { tmpdir } from "node:os";
import { parseFfmpegDurationBanner, ffprobeDuration } from "./tts.mjs";

test("parseFfmpegDurationBanner reads ffmpeg's stderr Duration line", () => {
  const stderr = [
    "ffmpeg version 6.0",
    "Input #0, wav, from 'a.wav':",
    "  Duration: 00:00:03.42, bitrate: 705 kb/s",
    "At least one output file must be specified",
  ].join("\n");
  assert.equal(parseFfmpegDurationBanner(stderr), 3.42);
});

test("parseFfmpegDurationBanner handles an hours component", () => {
  const stderr = "  Duration: 01:02:03.50, start: 0.000000, bitrate: 128 kb/s";
  assert.equal(parseFfmpegDurationBanner(stderr), 3723.5);
});

test("parseFfmpegDurationBanner returns NaN when there is no Duration line", () => {
  assert.ok(Number.isNaN(parseFfmpegDurationBanner("ffmpeg: command not found")));
  assert.ok(Number.isNaN(parseFfmpegDurationBanner("")));
  assert.ok(Number.isNaN(parseFfmpegDurationBanner(undefined)));
});

// Regression for the actual bug: ffprobeDuration used to collapse "ffprobe
// binary is missing" (ENOENT — the "essentials"-style Windows ffmpeg build
// with no ffprobe.exe) and "file is genuinely unreadable" into the same NaN,
// giving audio.mjs no way to tell "measure differently" from "give up".
//
// Builds an isolated PATH containing only a fake `ffmpeg` stub (no `ffprobe`
// at all) so ffprobeDuration's spawnSync("ffprobe", ...) call ENOENTs for
// real, then verifies it recovers the duration via the ffmpeg fallback
// instead of returning NaN.
test("ffprobeDuration falls back to ffmpeg when the ffprobe binary itself is missing", () => {
  const dir = mkdtempSync(join(tmpdir(), "tts-ffprobe-fallback-"));
  const fakeFfmpeg = join(dir, "ffmpeg");
  writeFileSync(
    fakeFfmpeg,
    "#!/bin/sh\necho 'Duration: 00:00:02.50, start: 0.000000, bitrate: 128 kb/s' 1>&2\nexit 1\n",
  );
  chmodSync(fakeFfmpeg, 0o755);
  const originalPath = process.env.PATH;
  try {
    process.env.PATH = dir; // only the fake ffmpeg resolves; no real ffprobe on this PATH
    assert.equal(ffprobeDuration("/does/not/matter.wav"), 2.5);
  } finally {
    process.env.PATH = originalPath;
    rmSync(dir, { recursive: true, force: true });
  }
});

test("ffprobeDuration returns NaN when neither ffprobe nor ffmpeg resolve", () => {
  const dir = mkdtempSync(join(tmpdir(), "tts-no-binaries-"));
  const originalPath = process.env.PATH;
  try {
    process.env.PATH = dir; // empty directory — nothing resolves
    assert.ok(Number.isNaN(ffprobeDuration("/does/not/matter.wav")));
  } finally {
    process.env.PATH = originalPath;
    rmSync(dir, { recursive: true, force: true });
  }
});
