#!/usr/bin/env python3
"""
Mailpit → Gotify bridge webhook.

Receives POSTs from Mailpit (MP_WEBHOOK_URL) when new mail arrives.
Fetches the full message from the Mailpit API, extracts useful info,
and forwards a summary to Gotify.
"""

import logging
import os
import json
from typing import Any, Dict

import requests
from dotenv import load_dotenv
from flask import Flask, jsonify, request

# ------------------------------------------------------------------ #
# Config & logging
# ------------------------------------------------------------------ #

load_dotenv()

MAILPIT_API = os.getenv("MAILPIT_API", "http://localhost:8025")
MAILPIT_TOKEN = os.getenv("MAILPIT_TOKEN", "")

NTFY_URL = os.getenv("NTFY_URL", "")
NTFY_TOKEN = os.getenv("NTFY_TOKEN", "")
NTFY_TOPIC = os.getenv("NTFY_TOPIC", "")

LOG_LEVEL = os.getenv("LOG_LEVEL", "INFO").upper()

logging.basicConfig(
    level=getattr(logging, LOG_LEVEL, logging.INFO),
    format="%(asctime)s [%(levelname)s] %(message)s",
)
log = logging.getLogger("mailpit-hook")

app = Flask(__name__)

from utils.ntfy_api import NtfyNotifier

# ------------------------------------------------------------------ #
# Helpers
# ------------------------------------------------------------------ #

def get_mailpit_message(message_id: str) -> Dict[str, Any]:
    """Retrieve full message JSON from Mailpit REST API."""
    url = f"{MAILPIT_API}/api/v1/message/{message_id}"
    headers = {}
    if MAILPIT_TOKEN:
        headers["Authorization"] = f"Bearer {MAILPIT_TOKEN}"

    resp = requests.get(url, headers=headers, timeout=10)
    resp.raise_for_status()
    return resp.json()

def get_mailpit_image_thumb(message_id: str, part_id: str) -> bytes:
    """Retrieve image thumbnail from Mailpit REST API as binary data."""
    url = f"{MAILPIT_API}/api/v1/message/{message_id}/part/{part_id}/thumb"
    headers = {}
    if MAILPIT_TOKEN:
        headers["Authorization"] = f"Bearer {MAILPIT_TOKEN}"

    resp = requests.get(url, headers=headers, timeout=10)
    resp.raise_for_status()
    return resp.content

def get_mailpit_image(message_id: str, part_id: str) -> bytes:
    """Retrieve image thumbnail from Mailpit REST API as binary data."""
    url = f"{MAILPIT_API}/api/v1/message/{message_id}/part/{part_id}"
    headers = {}
    if MAILPIT_TOKEN:
        headers["Authorization"] = f"Bearer {MAILPIT_TOKEN}"

    resp = requests.get(url, headers=headers, timeout=10)
    resp.raise_for_status()
    return resp.content

def send_notification(title: str, message: str, priority: int = 5,
                      image_data: bytes = None, filename: str = "image.jpg") -> bool:
    """Send a notification to Ntfy, optionally with an image attachment."""
    notify = NtfyNotifier(NTFY_URL, NTFY_TOKEN, NTFY_TOPIC)

    if image_data:
        result = notify.send_with_image(
            title=title, message=message, image_data=image_data,
            filename=filename, priority=priority
        )
    else:
        result = notify.send(title=title, message=message, priority=priority)

    if not result:
        log.warning("Ntfy push failed")
    else:
        log.info("Ntfy push OK")
    return result


# ------------------------------------------------------------------ #
# Webhook route
# ------------------------------------------------------------------ #

@app.route("/hook", methods=["POST"])
def hook():
    """
    Mailpit sends JSON like:
    {
        "ID": "abcdef123",
        "MessageID": "<...>",
        "From": "camera@reolink.local",
        "Subject": "Motion Detected",
        ...
    }
    """
    data = request.get_json(silent=True) or {}
    mail_msg_id = data.get("MessageID")
    msg_id = data.get("ID")
    if not msg_id:
        log.warning("Webhook received malformed payload: %s", data)
        return jsonify({"error": "missing ID"}), 400

    log.info(f"Webhook triggered for message ID={msg_id} - Email MSG_ID={mail_msg_id}")

    result = handle_hook(msg_id)
    if result:
        return jsonify({"status": "ok"}), 200
    else:
        return jsonify({"error":"Error sending webhook"}), 500
    

def handle_hook(msg_id: str):
    try:
        msg = get_mailpit_message(msg_id)
        subject = msg.get("Subject", "(no subject)")
        text = msg.get("Text", "") or msg.get("HTML", "")
        attachments = msg.get("Attachments") or []

        # Build preview text
        preview = (text or "")
        if len(preview) > 200:
            preview = preview[:200] + "..."

        # Check for image attachments and fetch thumbnail
        image_data = None
        filename = "image.jpg"
        if attachments:
            first_attachment = attachments[0]
            part_id = first_attachment.get("PartID")
            content_type = first_attachment.get("ContentType", "")
            if part_id and content_type.startswith("image/"):
                try:
                    # image_data = get_mailpit_image_thumb(msg_id, part_id)
                    image_data = get_mailpit_image(msg_id, part_id)
                    # Extract filename from attachment if available
                    filename = first_attachment.get("FileName", "image.jpg")
                except Exception as e:
                    log.warning("Failed to fetch image thumbnail: %s", e)

        send_notification(subject, preview, image_data=image_data, filename=filename)
        return True

    except Exception as e:
        log.exception("Error processing webhook: %s", e)
        return False


# ------------------------------------------------------------------ #
# Entry point
# ------------------------------------------------------------------ #

if __name__ == "__main__":
    app.run(host="0.0.0.0", port=8088)