import csv
import random

random.seed(42)

SPAM_TEMPLATES = [
    "CONGRATULATIONS! You've WON a {prize}! Click {link} now to claim!!!",
    "URGENT: Your account will be suspended. Verify at {link} immediately",
    "Make ${amount} a week working from home, no experience needed! {link}",
    "FREE {prize} for the first 100 people! Limited time offer {link}",
    "Dear winner, you have been selected to receive {amount} dollars. Reply now",
    "Lowest prices on {product}! Buy now and save 90%! {link}",
    "Your {product} order could not be delivered, click {link} to reschedule",
    "Hot singles in your area want to meet you! {link}",
    "Act now! This {product} offer expires in 24 hours {link}",
    "You have 1 unread message regarding your {amount} refund, claim at {link}",
]

HAM_TEMPLATES = [
    "Hey, are we still on for lunch tomorrow at noon?",
    "Please find attached the {product} report you requested.",
    "Can you review the pull request I sent over this morning?",
    "Reminder: team meeting moved to 3pm today.",
    "Thanks for your help with the {product} demo yesterday.",
    "The invoice for {amount} has been processed, receipt attached.",
    "Let's catch up sometime this week, been a while.",
    "I'll be out of office next Monday, please contact the team lead.",
    "Great presentation earlier, learned a lot about {product}.",
    "Attached is the agenda for tomorrow's {product} planning session.",
]

PRIZES = ["iPhone", "vacation package", "gift card", "laptop", "cash prize"]
PRODUCTS = ["software", "quarterly", "marketing", "onboarding", "budget"]
LINKS = ["http://bit.ly/xyz123", "http://claim-now.co/win", "http://free-gift.biz"]
AMOUNTS = ["500", "1000", "2500", "10000"]


def fill(template):
    return template.format(
        prize=random.choice(PRIZES),
        link=random.choice(LINKS),
        amount=random.choice(AMOUNTS),
        product=random.choice(PRODUCTS),
    )


def generate(n_per_class=300):
    rows = []
    for _ in range(n_per_class):
        rows.append((fill(random.choice(SPAM_TEMPLATES)), 1,
                     round(min(1.0, max(0.0, random.gauss(0.85, 0.1))), 3)))
        rows.append((fill(random.choice(HAM_TEMPLATES)), 0,
                     round(min(1.0, max(0.0, random.gauss(0.08, 0.07))), 3)))
    random.shuffle(rows)
    return rows


if __name__ == "__main__":
    rows = generate(n_per_class=300)
    with open("data.csv", "w", newline="", encoding="utf-8") as f:
        writer = csv.writer(f)
        writer.writerow(["text", "label", "spam_score"])
        writer.writerows(rows)
    print(f"Wrote {len(rows)} rows to data.csv")