hashes.py
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	# -------------------------------------------------------------
	# Rhyne-Wyse :: Utilities :: Hashes
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# License: BSD-2-Clause
	# -------------------------------------------------------------


	import hashlib
	import re
	from pathlib import Path
	from typing import List

	from nasqueron_reports import Report
	from nasqueron_reports.formats.mediawiki import read_as_str

	from rhyne_wyse.config import get_hashes_path

	# -------------------------------------------------------------
	# Compute hashes
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	REPORT_DATE_RE = r"\d{4}-\d{2}-\d{2} report"


	def compute_hash_ignoring_date(report: Report) -> str:
	if report.raw.rows is None:
	content = [
	line
	for line in report.formatted.splitlines()
	if not re.search(REPORT_DATE_RE, line)
	]
	return compute_hash_from(content)
	else:
	return compute_hash_from(report.raw.rows)


	def compute_hash_from_first_column(report: Report) -> str:
	if report.raw.rows is None:
	raise ValueError(
	"compute-hash-first-column is not supported when raw report is unavailable"
	)

	content = [read_as_str(row[0]) for row in report.raw.rows]
	return compute_hash_from(content)


	def compute_hash_from(content: List[str]) -> str:
	"""Compute SHA-256 hash from a list of strings."""
	h = hashlib.sha256()

	for line in content:
	h.update(line.encode("utf-8"))
	h.update(b"\0") # separator to avoid accidental concatenation collisions

	return h.hexdigest()


	# -------------------------------------------------------------
	# Hashes datastore
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def key_to_filename(key: str) -> Path:
	"""Convert wiki page title to safe filename for hash storage."""
	safe = key.replace("/", "__").replace(" ", "_")

	return Path(get_hashes_path(), f"{safe}.sha256")


	def read_hash_from_datastore(key: str) -> str \| None:
	"""Read a hash for a given key from its file."""
	path = key_to_filename(key)

	if not path.exists():
	return None

	return path.read_text(encoding="utf-8").strip()


	def write_hash_to_datastore(key: str, hash_to_write: str):
	"""Write a hash for a given key to its file."""
	path = key_to_filename(key)

	path.parent.mkdir(parents=True, exist_ok=True)
	path.write_text(hash_to_write + "\n", encoding="utf-8")

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