first commit

bot/utils/amount_parser.py

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+from decimal import Decimal, InvalidOperation
+import re
+
+
+def parse_rub_amount(raw_value: str) -> Decimal | None:
+    normalized_value = raw_value.lower().strip().replace(",", ".")
+    normalized_value = normalized_value.replace(" ", "")
+    normalized_value = re.sub(r"руб(лей|ля|ль|ле|\.?)", "", normalized_value)
+    normalized_value = re.sub(r"[^\d.]", "", normalized_value)
+
+    if not normalized_value or normalized_value.count(".") > 1:
+        return None
+
+    try:
+        amount = Decimal(normalized_value)
+    except InvalidOperation:
+        return None
+
+    if amount <= 0:
+        return None
+
+    if amount.as_tuple().exponent < -2:
+        return None
+
+    return amount.quantize(Decimal("0.01"))
+
+
+def format_rub_amount(amount: Decimal) -> str:
+    normalized_amount = amount.quantize(Decimal("0.01"))
+
+    if normalized_amount == normalized_amount.to_integral():
+        return f"{int(normalized_amount)} ₽"
+
+    return f"{normalized_amount:.2f} ₽".replace(".", ",")