Reorganize project structure

checkaddy_app/formatters.py

@@ -0,0 +1,59 @@
+from __future__ import annotations
+
+from decimal import Decimal, ROUND_DOWN, getcontext
+from typing import Any, Optional
+
+from .constants import COIN_DECIMALS, COIN_DISPLAY_SYMBOL, COIN_UNIT_LABEL
+
+getcontext().prec = 28
+
+
+def quant_for_decimals(decimals: int) -> Decimal:
+    return Decimal(1).scaleb(-decimals)
+
+
+def parse_optional_int(value: Any) -> Optional[int]:
+    if value is None:
+        return None
+    if isinstance(value, int):
+        return value
+    if isinstance(value, list):
+        return len(value)
+    try:
+        return int(str(value))
+    except (TypeError, ValueError):
+        return None
+
+
+def decimal_coin_str(value: Any, decimals: int = 8) -> str:
+    return format(Decimal(str(value)).quantize(quant_for_decimals(decimals)), "f")
+
+
+def units_to_coin_str(units: int, decimals: int) -> str:
+    scale = Decimal(10) ** decimals
+    return format((Decimal(units) / scale).quantize(quant_for_decimals(decimals)), "f")
+
+
+def sats_to_coin_str(units: int) -> str:
+    return units_to_coin_str(units, 8)
+
+
+def coin_str_to_units(amount_str: str, decimals: int) -> int:
+    amount = Decimal(amount_str).quantize(quant_for_decimals(decimals))
+    scale = Decimal(10) ** decimals
+    return int((amount * scale).to_integral_value(rounding=ROUND_DOWN))
+
+
+def format_amount_display(coin: str, amount_str: Optional[str]) -> str:
+    if amount_str is None:
+        return "N/A"
+    decimals = COIN_DECIMALS[coin]
+    units = coin_str_to_units(amount_str, decimals)
+    unit_label = COIN_UNIT_LABEL[coin]
+    display_symbol = COIN_DISPLAY_SYMBOL[coin]
+    return f"{amount_str} {display_symbol} ({units} {unit_label})"
+
+
+def format_validation_badge(valid: bool, reason: str) -> str:
+    state = "valid" if valid else "invalid"
+    return f"{state} ({reason})"