"""Ntfy notification helpers — send meal reminders with action buttons."""

from __future__ import annotations

import json
import urllib.request
import urllib.error
from datetime import date


def _ntfy_headers(token: str, extra: dict[str, str] | None = None) -> dict[str, str]:
    """Build headers for ntfy request, optionally with Authorization."""
    headers = dict(extra) if extra else {}
    if token.strip():
        headers["Authorization"] = f"Bearer {token.strip()}"
    return headers


def send_meal_reminder(
    ntfy_url: str,
    ntfy_token: str,
    callback_token: str,
    meal_type: str,
    for_date: date,
    app_base_url: str,
) -> bool:
    """Send a meal reminder notification with Home/Out action buttons.

    Args:
        ntfy_url: Full topic URL (e.g. https://ntfy.sh/mytopic).
        ntfy_token: Bearer token for auth (empty for public topics).
        callback_token: Per-user token for the webhook callback.
        meal_type: 'lunch' or 'dinner'.
        for_date: The meal date.
        app_base_url: Base URL of this app (e.g. https://meals.ct.cozytren.ch).

    Returns:
        True if the notification was sent successfully.
    """
    date_str = for_date.isoformat()
    meal_label = "Lunch" if meal_type == "lunch" else "Dinner"

    callback_url = f"{app_base_url.rstrip('/')}/api/ntfy-callback"

    topic = ntfy_url.rstrip("/").rsplit("/", 1)[-1]
    message = f"Will you be home for {meal_label.lower()} on {date_str}?"

    home_body = json.dumps({
        "token": callback_token,
        "meal_type": meal_type,
        "date": date_str,
        "status": "yes",
    })
    out_body = json.dumps({
        "token": callback_token,
        "meal_type": meal_type,
        "date": date_str,
        "status": "no",
    })

    actions = json.dumps([
        {
            "action": "http",
            "label": "Home",
            "method": "POST",
            "url": callback_url,
            "headers": {"Content-Type": "application/json"},
            "body": home_body,
        },
        {
            "action": "http",
            "label": "Out",
            "method": "POST",
            "url": callback_url,
            "headers": {"Content-Type": "application/json"},
            "body": out_body,
        },
    ])

    headers = _ntfy_headers(ntfy_token, {
        "Title": f"{meal_label} - Meal Reminder",
        "Priority": "4",
        "Tags": "plate_with_cutlery",
        "Actions": actions,
        "Click": f"{app_base_url.rstrip('/')}/auto-login/{callback_token}?date={date_str}",
    })

    data = message.encode("utf-8")
    req = urllib.request.Request(ntfy_url, data=data, headers=headers)

    try:
        with urllib.request.urlopen(req, timeout=10) as resp:
            return 200 <= resp.status < 300
    except urllib.error.URLError as e:
        print(f"[ntfy] Failed to send to {ntfy_url}: {e}")
        return False


def send_test_notification(ntfy_url: str, ntfy_token: str) -> bool:
    """Send a simple test notification to verify ntfy configuration."""
    topic = ntfy_url.rstrip("/").rsplit("/", 1)[-1]

    headers = _ntfy_headers(ntfy_token, {
        "Title": "Meal Tracker - Test",
        "Priority": "3",
        "Tags": "white_check_mark",
    })

    data = "Your ntfy integration is working! You'll receive meal reminders here.".encode("utf-8")
    req = urllib.request.Request(ntfy_url, data=data, headers=headers)

    try:
        with urllib.request.urlopen(req, timeout=10) as resp:
            return 200 <= resp.status < 300
    except urllib.error.URLError as e:
        print(f"[ntfy] Test failed for {ntfy_url}: {e}")
        return False