import json
from pathlib import Path
from typing import Any, Dict


TASK_VIDEO_NAME = "video.mp4"
TASK_FIRST_FRAME_NAME = "first_frame.jpg"
TASK_METADATA_NAME = "metadata.json"
TASK_LOG_NAME = "run.log"


def ensure_dir(path: Path) -> Path:
    path.mkdir(parents=True, exist_ok=True)
    return path


def task_output_dir(base_output_dir: Path, task_id: str) -> Path:
    return ensure_dir(base_output_dir / task_id)


def write_json(path: Path, data: Dict[str, Any]) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    with path.open("w", encoding="utf-8") as f:
        json.dump(data, f, ensure_ascii=False, indent=2)