import csv, sys
from datetime import datetime, timezone

columns = ["type", "title", "source_url", "tags", "created_at"]
with open(sys.argv[1], newline="", encoding="utf-8-sig") as source, \
     open("captures.csv", "w", newline="", encoding="utf-8") as target:
    writer = csv.DictWriter(target, fieldnames=columns)
    writer.writeheader()
    for row in csv.DictReader(source):
        added = row.get("time_added", "")
        created = datetime.fromtimestamp(int(added), timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ") if added else ""
        tags = [tag.strip() for tag in row.get("tags", "").split("|") if tag.strip()]
        writer.writerow({
            "type": "link",
            "title": row.get("title", ""),
            "source_url": row.get("url", ""),
            "tags": ";".join(tags),
            "created_at": created,
        })