# entity_extraction.py

import re
import dateparser

# Extend your product list based on your dataset or domain
PRODUCT_LIST = [
    "productA", "productB", "productC", "laptop", "phone", "router", "headphones"
]

# Keywords indicating complaints or issues
COMPLAINT_KEYWORDS = [
    "broken", "late", "error", "delay", "fault", "not working", "slow", "missing", "haven’t received"
]

def extract_entities(text):
    """
    Extracts products, dates, and complaint keywords from the input text.

    Args:
        text (str): Customer support ticket text.

    Returns:
        dict: Dictionary with lists of extracted 'products', 'dates', and 'complaints'.
    """
    text_lower = text.lower()

    # Product extraction - check presence of product keywords
    products_found = [p for p in PRODUCT_LIST if p.lower() in text_lower]

    # Date extraction - exact dates and fuzzy relative dates
    date_phrases = re.findall(
        r'\b(?:last week|yesterday|today|on \w+ \d{1,2}|\d{2}/\d{2}/\d{4})\b',
        text_lower
    )
    # Filter only valid dates using dateparser
    dates_found = [d for d in date_phrases if dateparser.parse(d)]

    # Complaint extraction - check for complaint keywords
    complaints_found = [word for word in COMPLAINT_KEYWORDS if word in text_lower]

    return {
        'products': products_found,
        'dates': dates_found,
        'complaints': complaints_found
    }


# Example usage
if __name__ == "__main__":
    sample_text = (
        "I ordered a laptop last week but still haven’t received it. "
        "This delay is frustrating and I need help."
    )
    entities = extract_entities(sample_text)
    print("Extracted Entities:", entities)