"""Notification dispatch service."""

from __future__ import annotations

import logging
from typing import Any

import aiohttp
import jinja2

from immich_watcher_core.telegram.client import TelegramClient

from ..database.models import MessageTemplate, NotificationTarget
from ..webhook.client import WebhookClient

_LOGGER = logging.getLogger(__name__)

# Default template used when no custom template is configured
DEFAULT_TEMPLATE = (
    "{{ added_count }} new item(s) added to album \"{{ album_name }}\"."
    "{% if people %}\nPeople: {{ people | join(', ') }}{% endif %}"
)


def render_template(template_body: str, context: dict[str, Any]) -> str:
    """Render a Jinja2 template with the given context."""
    env = jinja2.Environment(autoescape=False)
    tmpl = env.from_string(template_body)
    return tmpl.render(**context)


async def send_notification(
    target: NotificationTarget,
    event_data: dict[str, Any],
    template: MessageTemplate | None = None,
) -> dict[str, Any]:
    """Send a notification to a target using event data.

    Args:
        target: Notification destination (telegram or webhook)
        event_data: Album change event data (album_name, added_count, etc.)
        template: Optional message template (uses default if None)
    """
    template_body = template.body if template else DEFAULT_TEMPLATE
    try:
        message = render_template(template_body, event_data)
    except jinja2.TemplateError as e:
        _LOGGER.error("Template rendering failed: %s", e)
        message = f"Album changed: {event_data.get('album_name', 'unknown')}"

    if target.type == "telegram":
        return await _send_telegram(target, message, event_data)
    elif target.type == "webhook":
        return await _send_webhook(target, message, event_data)
    else:
        return {"success": False, "error": f"Unknown target type: {target.type}"}


async def send_test_notification(target: NotificationTarget) -> dict[str, Any]:
    """Send a test notification to verify target configuration."""
    test_data = {
        "album_name": "Test Album",
        "added_count": 1,
        "removed_count": 0,
        "change_type": "assets_added",
        "people": [],
        "added_assets": [],
    }

    if target.type == "telegram":
        return await _send_telegram(
            target, "Test notification from Immich Watcher", test_data
        )
    elif target.type == "webhook":
        return await _send_webhook(
            target, "Test notification from Immich Watcher", test_data
        )
    return {"success": False, "error": f"Unknown target type: {target.type}"}


async def _send_telegram(
    target: NotificationTarget, message: str, event_data: dict[str, Any]
) -> dict[str, Any]:
    """Send notification via Telegram."""
    config = target.config
    bot_token = config.get("bot_token")
    chat_id = config.get("chat_id")

    if not bot_token or not chat_id:
        return {"success": False, "error": "Missing bot_token or chat_id in target config"}

    async with aiohttp.ClientSession() as session:
        client = TelegramClient(session, bot_token)

        # Build assets list from event data for media sending
        assets = []
        for asset in event_data.get("added_assets", []):
            url = asset.get("download_url") or asset.get("url")
            if url:
                asset_type = "video" if asset.get("type") == "VIDEO" else "photo"
                assets.append({"url": url, "type": asset_type})

        return await client.send_notification(
            chat_id=str(chat_id),
            caption=message,
            assets=assets if assets else None,
        )


async def _send_webhook(
    target: NotificationTarget, message: str, event_data: dict[str, Any]
) -> dict[str, Any]:
    """Send notification via webhook."""
    config = target.config
    url = config.get("url")
    headers = config.get("headers", {})

    if not url:
        return {"success": False, "error": "Missing url in target config"}

    payload = {
        "message": message,
        "event": event_data,
    }

    async with aiohttp.ClientSession() as session:
        client = WebhookClient(session, url, headers)
        return await client.send(payload)