"""Extract duration of all downloaded videos using ffprobe."""

import json
import subprocess
import os
from pathlib import Path
from concurrent.futures import ThreadPoolExecutor, as_completed

VIDEO_DIR = Path(__file__).parent / "videos"
OUTPUT_FILE = Path(__file__).parent / "video_durations.json"


def get_duration(video_path: Path) -> float | None:
    try:
        result = subprocess.run(
            ["ffprobe", "-v", "quiet", "-print_format", "json", "-show_format", str(video_path)],
            capture_output=True, text=True, timeout=30)
        if result.returncode == 0:
            info = json.loads(result.stdout)
            return float(info["format"]["duration"])
    except Exception:
        pass
    return None


def main():
    video_files = []
    for d in VIDEO_DIR.iterdir():
        if not d.is_dir():
            continue
        for f in d.iterdir():
            if f.suffix in (".mp4", ".mkv", ".webm") and not f.name.endswith(".part"):
                video_files.append(f)
                break

    print(f"Found {len(video_files)} video files")

    durations = {}
    with ThreadPoolExecutor(max_workers=16) as executor:
        futures = {executor.submit(get_duration, f): f for f in video_files}
        for i, fut in enumerate(as_completed(futures), 1):
            f = futures[fut]
            vid_id = f.parent.name
            dur = fut.result()
            if dur is not None:
                durations[vid_id] = round(dur, 2)
            if i % 500 == 0 or i == len(video_files):
                print(f"  [{i}/{len(video_files)}] processed")

    with open(OUTPUT_FILE, "w") as f:
        json.dump(durations, f)

    vals = sorted(durations.values())
    total_h = sum(vals) / 3600
    print(f"\nResults ({len(durations)} videos):")
    print(f"  Total:   {total_h:.1f} hours")
    print(f"  Mean:    {sum(vals)/len(vals):.1f}s")
    print(f"  Median:  {vals[len(vals)//2]:.1f}s")
    print(f"  Min:     {vals[0]:.1f}s")
    print(f"  Max:     {vals[-1]:.1f}s")
    print(f"  <1min:   {sum(1 for v in vals if v<60)}")
    print(f"  1-5min:  {sum(1 for v in vals if 60<=v<300)}")
    print(f"  5-30min: {sum(1 for v in vals if 300<=v<1800)}")
    print(f"  30m-1h:  {sum(1 for v in vals if 1800<=v<3600)}")
    print(f"  1-3h:    {sum(1 for v in vals if 3600<=v<10800)}")
    print(f"  >3h:     {sum(1 for v in vals if v>=10800)}")
    print(f"\nSaved to {OUTPUT_FILE}")


if __name__ == "__main__":
    main()