import os
import sys
import logging
import smtplib
from datetime import datetime
from email.message import EmailMessage

import requests

logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
log = logging.getLogger(__name__)

SCHOOL_SLUG = "kyrene-de-la-mariposa"
MENU_TYPE = "lunch"
API_BASE = "https://kyrene.api.nutrislice.com/menu/api/weeks/school"


def get_lunch_menu(date_str: str | None = None) -> tuple[list[str], str]:
    if date_str is None:
        date_str = datetime.now().strftime("%Y-%m-%d")

    dt = datetime.strptime(date_str, "%Y-%m-%d")
    url = f"{API_BASE}/{SCHOOL_SLUG}/menu-type/{MENU_TYPE}/{dt.year}/{dt.month:02d}/{dt.day:02d}/"
    log.info(f"Fetching {url}")

    resp = requests.get(
        url,
        headers={"Accept": "application/json", "User-Agent": "Mozilla/5.0"},
        timeout=20,
    )
    resp.raise_for_status()
    data = resp.json()

    items = []
    for day in data.get("days", []):
        if day.get("date") != date_str:
            continue
        for entry in day.get("menu_items", []):
            if entry.get("is_section_title") or entry.get("is_station_header"):
                continue
            food = entry.get("food")
            if food and food.get("name"):
                items.append(food["name"].strip())

    return items, date_str


def send_sms(message: str, phone: str) -> None:
    gmail_user = os.environ["GMAIL_USER"]
    gmail_pass = os.environ["GMAIL_APP_PASSWORD"]
    gateway = os.environ.get("CARRIER_GATEWAY", "vtext.com")
    to_addr = f"{phone}@{gateway}"

    msg = EmailMessage()
    msg["From"] = gmail_user
    msg["To"] = to_addr
    msg.set_content(message)

    log.info(f"Sending email-to-SMS → {to_addr}")
    with smtplib.SMTP("smtp.gmail.com", 587) as smtp:
        smtp.starttls()
        smtp.login(gmail_user, gmail_pass)
        smtp.send_message(msg)
    log.info("Sent.")


def main():
    phone = os.environ.get("PHONE_NUMBER", "").strip()
    if not phone:
        log.error("PHONE_NUMBER environment variable is not set.")
        sys.exit(1)

    try:
        items, date_str = get_lunch_menu()
        if items:
            body = "\n".join(f"• {i}" for i in items)
            message = f"Mariposa Lunch {date_str}:\n{body}"
        else:
            message = (
                f"No lunch menu posted for {date_str} "
                f"(Kyrene de la Mariposa — may be a break or holiday)."
            )
    except Exception as e:
        log.exception("Failed to fetch menu")
        message = f"Error fetching Mariposa lunch menu: {e}"

    # SMS via email has a ~160 char limit per message segment; keep it short
    if len(message) > 1400:
        message = message[:1397] + "..."

    log.info(f"Message:\n{message}")

    try:
        send_sms(message, phone)
    except Exception as e:
        log.error(f"Failed to send SMS: {e}")
        sys.exit(1)


if __name__ == "__main__":
    main()