#!/usr/bin/env python3


import sys
import os
from datetime import datetime, timedelta
from dotenv import load_dotenv

# load same environment config as Flask
load_dotenv("/home/def/otb_billing/.env")

sys.path.append("/home/def/otb_billing/backend")

from app import get_db_connection, send_configured_email, recalc_invoice_totals


REMINDER_DAYS = 7
OVERDUE_DAYS = 14


def main():
    print(f"[{datetime.now().isoformat()}] invoice_reminder_worker starting")
    checked_count = 0
    reminder_sent_count = 0
    overdue_sent_count = 0
    skipped_count = 0
    conn = get_db_connection()
    cursor = conn.cursor(dictionary=True)

    now = datetime.utcnow()

    cursor.execute("""
        SELECT
            i.id,
            i.invoice_number,
            i.created_at,
            i.client_id,
            c.email,
            c.company_name,
            c.contact_name
        FROM invoices i
        JOIN clients c ON c.id = i.client_id
        WHERE i.status IN ('pending','sent')
    """)

    invoices = cursor.fetchall()

    for inv in invoices:
        age = (now - inv["created_at"]).days

        email = inv["email"]
        if not email:
            continue

        name = inv.get("contact_name") or inv.get("company_name") or "Client"

        portal_url = f"https://portal.outsidethebox.top/portal/invoice/{inv['id']}"

        if age >= OVERDUE_DAYS:

            subject = f"Invoice {inv['invoice_number']} is overdue"

            body = f"""
Hello {name},

Invoice {inv['invoice_number']} is now overdue.

Amount Due:
{recalc_invoice_totals(inv['id'])['total']}

View invoice:
{portal_url}

Please arrange payment at your earliest convenience.

OutsideTheBox
"""

            send_configured_email(
                to_email=email,
                subject=subject,
                body=body,
                attachments=None,
                email_type="invoice_overdue",
                invoice_id=inv["id"]
            )

        elif age >= REMINDER_DAYS:

            subject = f"Invoice {inv['invoice_number']} reminder"

            body = f"""
Hello {name},

This is a reminder that invoice {inv['invoice_number']} is still outstanding.

Amount Due:
{recalc_invoice_totals(inv['id'])['total']}

View invoice:
{portal_url}

Thank you.

OutsideTheBox
"""

            send_configured_email(
                to_email=email,
                subject=subject,
                body=body,
                attachments=None,
                email_type="invoice_reminder",
                invoice_id=inv["id"]
            )

    conn.close()


    print(f"[{datetime.now().isoformat()}] checked={checked_count} reminders_sent={reminder_sent_count} overdue_sent={overdue_sent_count} skipped={skipped_count}")

if __name__ == "__main__":
    main()