"""
Notification tools — proactively send messages to user channels.

nc_talk_send routes through notification.py → channels.json.
email_send uses the server SMTP config from .env (smtp_server, smtp_from_*).
"""

import asyncio
import json
import logging
import re

from google.genai import types
from config import settings
from persona import get_user

logger = logging.getLogger(__name__)


def _load_allowlist(username: str) -> list[str]:
    """Load the per-user email allowlist. Returns empty list if not configured."""
    path = settings.home_root() / username / "email_allowlist.json"
    try:
        return [str(p).strip() for p in json.loads(path.read_text()) if str(p).strip()]
    except FileNotFoundError:
        return []
    except Exception as e:
        logger.warning("failed to read email_allowlist.json for %s: %s", username, e)
        return []


def _email_allowed(address: str, patterns: list[str]) -> bool:
    """Return True if address matches any pattern (regex, case-insensitive full match)."""
    addr = address.strip()
    for pattern in patterns:
        try:
            if re.fullmatch(pattern, addr, re.IGNORECASE):
                return True
        except re.error:
            logger.warning("invalid regex in email allowlist: %r", pattern)
    return False


async def email_send(to: str, subject: str, body: str) -> str:
    """Send an email via the server's configured SMTP account."""
    username = get_user()
    allowlist = _load_allowlist(username)

    if not allowlist:
        return (
            "Email blocked — no allowlist configured. "
            f"Add allowed patterns to home/{username}/email_allowlist.json as a JSON array."
        )
    if not _email_allowed(to, allowlist):
        return f"Email blocked — {to} does not match any allowed pattern for {username}."

    from email_utils import send_email
    ok = await asyncio.to_thread(
        send_email,
        to_email=to,
        subject=subject,
        body_text=body,
        body_html=body.replace("\n", "<br>"),
    )
    if ok:
        return f"Email sent to {to}."
    return "Failed to send email — check SMTP configuration in .env."


async def web_push(title: str, body: str, url: str = "") -> str:
    """Send a browser push notification to the current user's registered devices."""
    import push_utils
    username = get_user()
    result = await push_utils.send_push(username, title, body, url)
    if "error" in result:
        return f"Push failed: {result['error']}"
    return f"Push sent to {result['sent']} device(s) for {username} (pruned {result['pruned']} stale)."


async def nc_talk_send(message: str) -> str:
    """Send a message to the user via their configured notification channel.

    Channel is resolved from the user's channels.json (notification_channel key).
    Falls back to Nextcloud Talk if configured. No-op if no channel is set.
    """
    from notification import notify
    username = get_user()
    try:
        await notify(username, message)
        return f"Message sent to {username}'s notification channel."
    except Exception as e:
        logger.warning("nc_talk_send error for %s: %s", username, e)
        return f"Failed to send notification: {e}"


DECLARATIONS = [
    types.FunctionDeclaration(
        name="web_push",
        description=(
            "Send a browser push notification to the current user. Works even when the "
            "Cortex tab is not open. Use for completing long tasks, reminders that fire "
            "in the background, or anything the user should see immediately. "
            "url is optional — if set, clicking the notification opens that URL."
        ),
        parameters=types.Schema(
            type=types.Type.OBJECT,
            properties={
                "title": types.Schema(type=types.Type.STRING, description="Notification title (short)"),
                "body":  types.Schema(type=types.Type.STRING, description="Notification body text"),
                "url":   types.Schema(type=types.Type.STRING, description="Optional URL to open on click"),
            },
            required=["title", "body"],
        ),
    ),
    types.FunctionDeclaration(
        name="email_send",
        description=(
            "Send an email from the server's configured SMTP account. Use for delivering "
            "summaries, reports, reminders, or any content the user wants emailed. "
            "body is plain text; newlines are preserved."
        ),
        parameters=types.Schema(
            type=types.Type.OBJECT,
            properties={
                "to":      types.Schema(type=types.Type.STRING, description="Recipient email address"),
                "subject": types.Schema(type=types.Type.STRING, description="Email subject line"),
                "body":    types.Schema(type=types.Type.STRING, description="Plain-text email body"),
            },
            required=["to", "subject", "body"],
        ),
    ),
    types.FunctionDeclaration(
        name="nc_talk_send",
        description=(
            "Send a proactive message to the user via their configured notification channel "
            "(Nextcloud Talk by default). Use this to notify the user of completed background "
            "tasks, important events, or anything they should know between sessions. "
            "Requires notification_channel and notification_room set in channels.json."
        ),
        parameters=types.Schema(
            type=types.Type.OBJECT,
            properties={
                "message": types.Schema(type=types.Type.STRING, description="The message to send to the user"),
            },
            required=["message"],
        ),
    ),
]