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Text Utilities
--------------
Helpers for number-to-words, date formatting, amount formatting etc.
Used by generators to fill human-readable fields.
"""
import re
from datetime import datetime
# ── Number to Bangladeshi words ──────────────────────────────────────────────
_ONES = ["", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight",
"Nine", "Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen",
"Sixteen", "Seventeen", "Eighteen", "Nineteen"]
_TENS = ["", "", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"]
def _below_hundred(n: int) -> str:
if n < 20:
return _ONES[n]
return (_TENS[n // 10] + (" " + _ONES[n % 10] if n % 10 else "")).strip()
def _below_thousand(n: int) -> str:
if n < 100:
return _below_hundred(n)
return (_ONES[n // 100] + " Hundred" + (" " + _below_hundred(n % 100) if n % 100 else "")).strip()
def amount_to_words_bd(amount: float) -> str:
"""
Convert amount to Bangladeshi words using Crore/Lac/Thousand system.
e.g. 7500000 -> "Seven Crore Fifty Lac"
"""
n = int(round(amount))
if n == 0:
return "Zero"
parts = []
crore = n // 10_000_000
n %= 10_000_000
lac = n // 100_000
n %= 100_000
thousand = n // 1000
n %= 1000
if crore:
parts.append(_below_thousand(crore) + " Crore")
if lac:
parts.append(_below_thousand(lac) + " Lac")
if thousand:
parts.append(_below_thousand(thousand) + " Thousand")
if n:
parts.append(_below_thousand(n))
return " ".join(parts)
def format_bdt(amount: float) -> str:
"""Format as 'Tk. 75,00,000.00' (Bangladeshi comma grouping)."""
n = int(round(amount))
s = str(n)
# BD style: last 3 digits, then groups of 2
if len(s) > 3:
result = s[-3:]
s = s[:-3]
while s:
result = s[-2:] + "," + result
s = s[:-2]
return f"Tk. {result}.00"
return f"Tk. {s}.00"
# ── Date helpers ──────────────────────────────────────────────────────────────
_MONTH_MAP = {
"jan": "January", "feb": "February", "mar": "March", "apr": "April",
"may": "May", "jun": "June", "jul": "July", "aug": "August",
"sep": "September", "oct": "October", "nov": "November", "dec": "December",
}
def parse_date_flexible(date_str: str) -> datetime:
"""Try multiple date formats and return a datetime object."""
formats = [
"%d-%b-%Y", "%d-%B-%Y", "%d/%m/%Y", "%Y-%m-%d",
"%d-%m-%Y", "%d.%m.%Y",
]
for fmt in formats:
try:
return datetime.strptime(date_str.strip(), fmt)
except ValueError:
continue
raise ValueError(f"Cannot parse date: {date_str!r}")
def date_to_long(date_str: str) -> str:
"""Convert '30-Jun-2022' to '30th June 2022'."""
try:
dt = parse_date_flexible(date_str)
day = dt.day
suffix = "th" if 11 <= day <= 13 else {1: "st", 2: "nd", 3: "rd"}.get(day % 10, "th")
return f"{day}{suffix} {dt.strftime('%B %Y')}"
except ValueError:
return date_str
def date_to_document(date_str: str) -> str:
"""Convert '15-Apr-2021' to '15-04-2021'."""
try:
dt = parse_date_flexible(date_str)
return dt.strftime("%d-%m-%Y")
except ValueError:
return date_str
def bg_validity_date(completion_date_str: str, extra_days: int = 150) -> str:
"""
Bank Guarantee validity = completion date + ~150 days (28 days after tender validity).
Returns formatted date like '24-August-2021'.
"""
try:
dt = parse_date_flexible(completion_date_str)
from datetime import timedelta
dt2 = dt + timedelta(days=extra_days)
return f"{dt2.day}-{dt2.strftime('%B')}-{dt2.year}"
except ValueError:
return ""
# ── String helpers ────────────────────────────────────────────────────────────
def work_period_label(start: str, end: str) -> str:
"""e.g. '15-Apr-2021 to 30-Jun-2022'"""
return f"{start}\nto \n{end}\n"
def tender_id_label(tender_id: str) -> str:
return f"Tender ID: {tender_id}"
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