from __future__ import annotations

import csv
import json
from datetime import datetime, timezone
from pathlib import Path
from typing import Mapping


ROOT = Path(__file__).resolve().parents[1]


def write_json(data: Mapping, path: str | Path) -> Path:
    path = Path(path)
    if not path.is_absolute():
        path = ROOT / path
    path.parent.mkdir(parents=True, exist_ok=True)
    with path.open("w", encoding="utf-8") as f:
        json.dump(data, f, indent=2, sort_keys=True)
    return path


def append_result(row: Mapping, path: str | Path = "results/results.csv") -> Path:
    path = Path(path)
    if not path.is_absolute():
        path = ROOT / path
    path.parent.mkdir(parents=True, exist_ok=True)
    payload = dict(row)
    payload.setdefault("timestamp_utc", datetime.now(timezone.utc).isoformat())
    exists = path.exists()
    fieldnames = sorted(payload)
    if exists:
        with path.open("r", newline="", encoding="utf-8") as f:
            existing = csv.DictReader(f)
            fieldnames = sorted(set(existing.fieldnames or []) | set(fieldnames))
    rows = []
    if exists:
        with path.open("r", newline="", encoding="utf-8") as f:
            rows = list(csv.DictReader(f))
    rows.append(payload)
    with path.open("w", newline="", encoding="utf-8") as f:
        writer = csv.DictWriter(f, fieldnames=fieldnames)
        writer.writeheader()
        writer.writerows(rows)
    return path