| from __future__ import annotations | |
| import json | |
| import math | |
| import sqlite3 | |
| from decimal import Decimal, InvalidOperation, ROUND_HALF_UP | |
| from pathlib import Path | |
| from category_normalizer import normalize_category | |
| from rowcount_guard import evaluate_rowcount | |
| DB_PATH = Path("products.db") | |
| OUTPUT_PATH = Path("output.json") | |
| INVALID_NULLS = {"", "na", "n/a", "null", "none"} | |
| def parse_price(value: object) -> float | None: | |
| if value is None: | |
| return None | |
| text = str(value).strip() | |
| if not text or text.lower() in INVALID_NULLS: | |
| return None | |
| if text.startswith("$"): | |
| text = text[1:].strip() | |
| text = text.replace(",", "") | |
| try: | |
| price = float(text) | |
| except ValueError: | |
| return None | |
| if not math.isfinite(price) or price < 0: | |
| return None | |
| return price | |
| def parse_stock(value: object) -> int | None: | |
| if value is None: | |
| return None | |
| text = str(value).strip() | |
| if not text or text.lower() in INVALID_NULLS: | |
| return None | |
| try: | |
| stock = float(text) | |
| except ValueError: | |
| return None | |
| if not math.isfinite(stock) or stock < 0 or not stock.is_integer(): | |
| return None | |
| return int(stock) | |
| def round_money(value: float) -> float: | |
| return float(Decimal(str(value)).quantize(Decimal("0.01"), rounding=ROUND_HALF_UP)) | |
| def main() -> None: | |
| conn = sqlite3.connect(DB_PATH) | |
| conn.row_factory = sqlite3.Row | |
| try: | |
| rows = conn.execute( | |
| """ | |
| SELECT id, name, category, price, stock_quantity, active | |
| FROM products | |
| WHERE active = 1 | |
| AND lower(trim(category)) = ? | |
| ORDER BY id | |
| """, | |
| ("electronics",), | |
| ).fetchall() | |
| finally: | |
| conn.close() | |
| records: list[dict[str, object]] = [] | |
| price_sum = Decimal("0.00") | |
| stock_sum = 0 | |
| for row in rows: | |
| price = parse_price(row["price"]) | |
| stock = parse_stock(row["stock_quantity"]) | |
| if price is None or stock is None: | |
| continue | |
| price_sum += Decimal(str(price)) | |
| stock_sum += stock | |
| records.append( | |
| { | |
| "id": row["id"], | |
| "name": row["name"], | |
| "category": normalize_category(row["category"]), | |
| "price": round_money(price), | |
| "stock_quantity": stock, | |
| } | |
| ) | |
| rowcount_audit = evaluate_rowcount(len(records)) | |
| average_price = round_money(float(price_sum / len(records))) if records else 0.0 | |
| output = { | |
| "category": "Electronics", | |
| "row_count": len(records), | |
| "average_price": average_price, | |
| "total_stock": stock_sum, | |
| "rowcount_audit": rowcount_audit, | |
| "requery_performed": False, | |
| "records": records, | |
| } | |
| OUTPUT_PATH.write_text(json.dumps(output, indent=2), encoding="utf-8") | |
| if __name__ == "__main__": | |
| main() | |