import csv
import io
from typing import List, Dict


CSV_COLUMNS = [
    "scan_id",
    "filename",
    "file_type",
    "pii_type",
    "matched_value",
    "redacted_value",
    "confidence",
    "line",
    "column",
    "field",
]



def export_findings_csv(findings: List[Dict]) -> str:
    buffer = io.StringIO()
    writer = csv.DictWriter(buffer, fieldnames=CSV_COLUMNS)
    writer.writeheader()
    for row in findings:
        writer.writerow({key: row.get(key, "") for key in CSV_COLUMNS})
    return buffer.getvalue()