"""Gestor de escritura CSV.

Maneja la escritura incremental segura (con lock) en archivos CSV.
"""
import os
import csv
import threading
from typing import List, Dict, Any, Optional

class CSVManager:
    def __init__(self):
        self._lock = threading.Lock()

    def append_rows(self, csv_path: str, rows: List[Dict[str, Any]], header: List[str]) -> None:
        """Anexa filas a un CSV, creando encabezado si el archivo no existe."""
        os.makedirs(os.path.dirname(csv_path) or ".", exist_ok=True)
        file_exists = os.path.exists(csv_path) and os.path.getsize(csv_path) > 0
        
        with self._lock:
            with open(csv_path, "a", encoding="utf-8", newline="") as f:
                writer = csv.DictWriter(f, fieldnames=header, extrasaction="ignore", delimiter='|')
                if not file_exists:
                    writer.writeheader()
                for r in rows:
                    writer.writerow(r)