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import re

import uuid

def allowed_file(filename, allowed_extensions):

"""Check that the uploaded file has an allowed extension (e.g. pdf)."""

return (

"." in filename

and filename.rsplit(".", 1)[1].lower() in allowed_extensions

)

def generate_temp_filename(original_filename):

ext = original_filename.rsplit(".", 1)[1].lower()

return f"{uuid.uuid4().hex}.{ext}"

def sanitize_text(text, max_length=15000):

if not text:

return ""

# Strip null bytes and other non-printable control characters

cleaned = re.sub(r"[\x00-\x08\x0b\x0c\x0e-\x1f]", "", text)

# Collapse excessive blank lines

cleaned = re.sub(r"\n{3,}", "\n\n", cleaned)

return cleaned.strip()[:max_length]

def sanitize_form_field(value, max_length=1000):

if not value:

return ""

cleaned = re.sub(r"[\x00-\x08\x0b\x0c\x0e-\x1f]", "", value)

return cleaned.strip()[:max_length]

def score_label(score):

if score >= 75:

return "Good", "good"

elif score >= 50:

return "Average", "average"

else:

return "Needs Improvement", "needs-improvement"