'use strict';
const { execSync, spawnSync } = require('child_process');
const path = require('path');
const fs   = require('fs');

const FFMPEG = process.env.FFMPEG_PATH || 'ffmpeg';

const SAMPLES = {
  test1: 'tests/samples/media/toshiba/Radarr/Film Test (2023)/Film Test (2023).mkv',
  test2: 'tests/samples/media/toshiba/Sonarr/Naruto S01/Naruto S01E01.mkv',
  test3: 'tests/samples/test3_ultrawide.mkv',
  test4: 'tests/samples/test4_subtitles.mkv',
};

function run(cmd) {
  console.log(`\n>> ${cmd}\n`);
  const result = spawnSync(cmd, { shell: true, stdio: 'inherit' });
  if (result.status !== 0) {
    console.error(`Command failed with exit ${result.status}`);
    process.exit(1);
  }
}

function ensureDir(filePath) {
  fs.mkdirSync(path.dirname(filePath), { recursive: true });
}

// Test 1 — skip if already generated
if (!fs.existsSync(SAMPLES.test1)) {
  console.log('Generating Test 1: 23.976fps Film (AC3 ITA 448k + EAC3 ENG 640k)...');
  ensureDir(SAMPLES.test1);
  run([
    FFMPEG, '-y',
    '-f', 'lavfi', '-i', 'color=c=blue:s=1920x1080:r=24000/1001:d=30',
    '-f', 'lavfi', '-i', 'sine=f=440:r=48000:d=30',
    '-f', 'lavfi', '-i', 'sine=f=660:r=48000:d=30',
    '-map', '0:v', '-map', '1:a', '-map', '2:a',
    '-c:v', 'libx264', '-crf', '28', '-preset', 'ultrafast',
    '-c:a:0', 'ac3',  '-b:a:0', '448k', '-ac:a:0', '6', '-metadata:s:a:0', 'language=ita',
    '-c:a:1', 'eac3', '-b:a:1', '640k', '-ac:a:1', '6', '-metadata:s:a:1', 'language=eng',
    `"${SAMPLES.test1}"`,
  ].join(' '));
  console.log('Test 1 OK.\n');
} else {
  console.log('Test 1 already exists — skipping.\n');
}

// Test 2 — EAC3 ITA 640k 5.1 at 25fps (DTS is experimental in FFmpeg)
// Note: DTS logic is fully covered by unit tests with synthetic streams.
// For integration, we use EAC3 640k which triggers series clamping: 640>=384 -> Opus=384
console.log('Generating Test 2: 25fps Anime EAC3 ITA 640k 5.1 (Naruto)...');
ensureDir(SAMPLES.test2);
run([
  FFMPEG, '-y',
  '-f', 'lavfi', '-i', 'color=c=green:s=1280x720:r=25:d=30',
  '-f', 'lavfi', '-i', 'sine=f=660:r=48000:d=30',
  '-map', '0:v', '-map', '1:a',
  '-c:v', 'libx264', '-crf', '28', '-preset', 'ultrafast',
  '-c:a:0', 'eac3', '-b:a:0', '640k', '-ac:a:0', '6', '-metadata:s:a:0', 'language=ita',
  `"${SAMPLES.test2}"`,
].join(' '));
console.log('Test 2 OK.\n');

// Test 3 — Ultrawide 3840x1600
console.log('Generating Test 3: Ultrawide 3840x1600...');
ensureDir(SAMPLES.test3);
run([
  FFMPEG, '-y',
  '-f', 'lavfi', '-i', 'color=c=red:s=3840x1600:r=24:d=10',
  '-f', 'lavfi', '-i', 'sine=f=440:r=48000:d=10',
  '-map', '0:v', '-map', '1:a',
  '-c:v', 'libx264', '-crf', '28', '-preset', 'ultrafast',
  '-c:a', 'aac', '-b:a', '128k', '-metadata:s:a:0', 'language=eng',
  `"${SAMPLES.test3}"`,
].join(' '));
console.log('Test 3 OK.\n');

// Test 4 — SRT forced + SRT SDH
console.log('Generating Test 4: Subtitles (SRT forced + SRT SDH)...');
ensureDir(SAMPLES.test4);

const srtContent = '1\n00:00:01,000 --> 00:00:03,000\nTest subtitle line 1\n\n2\n00:00:04,000 --> 00:00:06,000\nTest subtitle line 2\n';
const tmpSrt = 'tests/samples/tmp_sub.srt';
fs.writeFileSync(tmpSrt, srtContent);

run([
  FFMPEG, '-y',
  '-f', 'lavfi', '-i', 'color=c=gray:s=1920x1080:r=25:d=30',
  '-f', 'lavfi', '-i', 'sine=f=440:r=48000:d=30',
  '-i', `"${tmpSrt}"`,
  '-i', `"${tmpSrt}"`,
  '-map', '0:v', '-map', '1:a', '-map', '2:s', '-map', '3:s',
  '-c:v', 'libx264', '-crf', '28', '-preset', 'ultrafast',
  '-c:a', 'aac', '-b:a', '128k', '-metadata:s:a:0', 'language=ita',
  '-c:s:0', 'srt', '-metadata:s:s:0', 'language=ita', '-disposition:s:0', 'forced',
  '-c:s:1', 'srt', '-metadata:s:s:1', 'language=ita', '-disposition:s:1', 'hearing_impaired',
  `"${SAMPLES.test4}"`,
].join(' '));
try { fs.unlinkSync(tmpSrt); } catch(_) {}
console.log('Test 4 OK.\n');

console.log('All test files generated. Run: node tests/run-tests.js --skip-transcode');