"""
Daily cron safety-net: check all budgets for the current month and send any
unsent 80% / 100% alert emails.

Run daily (e.g. 9 AM) so alerts fire even if the triggering transaction was
imported via a provider sync rather than entered manually through the UI.

    python scripts/check_budget_alerts.py
"""

import sys
import os
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from datetime import date
from app import create_app
from app.extensions import db

app = create_app()

with app.app_context():
    from app.models.user import User
    from app.models.budget import Budget
    from app.services.alert_service import (
        _smtp_configured, _send_single_alert_email
    )
    from app.services.budget_service import get_month_spending

    user = User.query.first()
    if not user or not user.budget_alerts_enabled:
        print("Budget alerts disabled — nothing to do.")
        sys.exit(0)

    if not _smtp_configured():
        print("SMTP not configured — nothing to do.")
        sys.exit(0)

    month_str = date.today().strftime('%Y-%m')
    symbol    = user.currency_symbol or '$'
    budgets   = Budget.query.filter_by(month=month_str).all()
    sent      = 0

    for b in budgets:
        limit = float(b.limit_amount) + float(b.rollover_amount or 0)
        if limit <= 0:
            continue
        spent = get_month_spending(b.category_id, month_str)
        pct   = spent / limit * 100
        cat   = b.category
        name  = cat.name if cat else 'Unknown'

        if pct >= 100 and not b.alert_sent_100:
            _send_single_alert_email(name, spent, limit, pct, symbol, threshold=100)
            b.alert_sent_100 = True
            sent += 1
        elif pct >= 80 and not b.alert_sent_80:
            _send_single_alert_email(name, spent, limit, pct, symbol, threshold=80)
            b.alert_sent_80 = True
            sent += 1

    if sent:
        db.session.commit()

    print(f"Budget alert check complete — {sent} email(s) sent.")