#!/usr/bin/env python3
"""
Homelab Telegram Bot
Two-way interactive bot for homelab management and notifications.
"""

import asyncio
import logging
import os
import subprocess
from datetime import datetime
from pathlib import Path

from telegram import Update
from telegram.ext import Application, CommandHandler, ContextTypes, MessageHandler, filters

# Setup logging
logging.basicConfig(
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    level=logging.INFO
)
logger = logging.getLogger(__name__)

# Load credentials
CREDENTIALS_FILE = Path(__file__).parent / 'credentials'
config = {}
with open(CREDENTIALS_FILE) as f:
    for line in f:
        if '=' in line:
            key, value = line.strip().split('=', 1)
            config[key] = value

TOKEN = config['TELEGRAM_BOT_TOKEN']

# Authorized users file (stores chat IDs that are allowed to use the bot)
AUTHORIZED_FILE = Path(__file__).parent / 'authorized_users'

# Inbox file for messages to Claude
INBOX_FILE = Path(__file__).parent / 'inbox'

def get_authorized_users():
    """Load authorized user IDs."""
    if AUTHORIZED_FILE.exists():
        with open(AUTHORIZED_FILE) as f:
            return set(int(line.strip()) for line in f if line.strip())
    return set()

def add_authorized_user(user_id: int):
    """Add a user to authorized list."""
    users = get_authorized_users()
    users.add(user_id)
    with open(AUTHORIZED_FILE, 'w') as f:
        for uid in users:
            f.write(f"{uid}\n")

def is_authorized(user_id: int) -> bool:
    """Check if user is authorized."""
    return user_id in get_authorized_users()

def run_command(cmd: list, timeout: int = 30) -> str:
    """Run a shell command and return output."""
    try:
        result = subprocess.run(
            cmd,
            capture_output=True,
            text=True,
            timeout=timeout,
            env={**os.environ, 'PATH': f"/home/mikkel/bin:{os.environ.get('PATH', '')}"}
        )
        output = result.stdout or result.stderr or "No output"
        # Telegram has 4096 char limit per message
        if len(output) > 4000:
            output = output[:4000] + "\n... (truncated)"
        return output
    except subprocess.TimeoutExpired:
        return "Command timed out"
    except Exception as e:
        return f"Error: {e}"

# Command handlers
async def start(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Handle /start command - first contact with bot."""
    user = update.effective_user
    chat_id = update.effective_chat.id

    if not is_authorized(user.id):
        # First user becomes authorized automatically
        if not get_authorized_users():
            add_authorized_user(user.id)
            await update.message.reply_text(
                f"Welcome {user.first_name}! You're now authorized as the admin.\n"
                f"Your chat ID: {chat_id}\n\n"
                f"Use /help to see available commands."
            )
        else:
            await update.message.reply_text(
                f"Unauthorized. Your user ID: {user.id}\n"
                "Contact the admin to get access."
            )
        return

    await update.message.reply_text(
        f"Welcome back {user.first_name}!\n"
        f"Use /help to see available commands."
    )

async def help_command(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Handle /help command."""
    if not is_authorized(update.effective_user.id):
        return

    help_text = """
*Homelab Bot Commands*

*Status & Monitoring:*
/status - Quick service overview
/pbs - PBS backup status
/backups - Last backup per VM/CT
/beszel - Server metrics
/kuma - Uptime Kuma status

*PBS Commands:*
/pbs\\_status - Full PBS overview
/pbs\\_errors - Recent errors
/pbs\\_gc - Garbage collection status

*System:*
/ping <host> - Ping a host
/help - This help message
/chatid - Show your chat ID
"""
    await update.message.reply_text(help_text, parse_mode='Markdown')

async def chatid(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Show chat ID (useful for notifications)."""
    await update.message.reply_text(f"Chat ID: `{update.effective_chat.id}`", parse_mode='Markdown')

async def status(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Quick status overview."""
    if not is_authorized(update.effective_user.id):
        return

    await update.message.reply_text("Checking services...")

    # Quick checks
    output_lines = ["*Homelab Status*\n"]

    # Check key services via ping
    services = [
        ("NPM", "10.5.0.1"),
        ("DNS", "10.5.0.2"),
        ("PBS", "10.5.0.6"),
        ("Dockge", "10.5.0.10"),
        ("Forgejo", "10.5.0.14"),
    ]

    for name, ip in services:
        result = subprocess.run(
            ["ping", "-c", "1", "-W", "1", ip],
            capture_output=True
        )
        status = "up" if result.returncode == 0 else "down"
        output_lines.append(f"{'✅' if status == 'up' else '❌'} {name} ({ip})")

    await update.message.reply_text("\n".join(output_lines), parse_mode='Markdown')

async def pbs(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """PBS quick status."""
    if not is_authorized(update.effective_user.id):
        return

    await update.message.reply_text("Fetching PBS status...")
    output = run_command(["/home/mikkel/bin/pbs", "status"])
    await update.message.reply_text(f"```\n{output}\n```", parse_mode='Markdown')

async def pbs_status(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """PBS full status."""
    if not is_authorized(update.effective_user.id):
        return

    await update.message.reply_text("Fetching PBS status...")
    output = run_command(["/home/mikkel/bin/pbs", "status"])
    await update.message.reply_text(f"```\n{output}\n```", parse_mode='Markdown')

async def backups(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """PBS backups per VM/CT."""
    if not is_authorized(update.effective_user.id):
        return

    await update.message.reply_text("Fetching backup status...")
    output = run_command(["/home/mikkel/bin/pbs", "backups"], timeout=60)
    await update.message.reply_text(f"```\n{output}\n```", parse_mode='Markdown')

async def pbs_errors(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """PBS errors."""
    if not is_authorized(update.effective_user.id):
        return

    output = run_command(["/home/mikkel/bin/pbs", "errors"])
    await update.message.reply_text(f"```\n{output}\n```", parse_mode='Markdown')

async def pbs_gc(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """PBS garbage collection status."""
    if not is_authorized(update.effective_user.id):
        return

    output = run_command(["/home/mikkel/bin/pbs", "gc"])
    await update.message.reply_text(f"```\n{output}\n```", parse_mode='Markdown')

async def beszel(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Beszel server metrics."""
    if not is_authorized(update.effective_user.id):
        return

    await update.message.reply_text("Fetching server metrics...")
    output = run_command(["/home/mikkel/bin/beszel", "status"])
    await update.message.reply_text(f"```\n{output}\n```", parse_mode='Markdown')

async def kuma(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Uptime Kuma status."""
    if not is_authorized(update.effective_user.id):
        return

    output = run_command(["/home/mikkel/bin/kuma", "list"])
    await update.message.reply_text(f"```\n{output}\n```", parse_mode='Markdown')

async def ping_host(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Ping a host."""
    if not is_authorized(update.effective_user.id):
        return

    if not context.args:
        await update.message.reply_text("Usage: /ping <host>")
        return

    host = context.args[0]
    # Basic validation
    if not host.replace('.', '').replace('-', '').isalnum():
        await update.message.reply_text("Invalid hostname")
        return

    result = subprocess.run(
        ["ping", "-c", "3", "-W", "2", host],
        capture_output=True,
        text=True,
        timeout=10
    )
    output = result.stdout or result.stderr
    await update.message.reply_text(f"```\n{output}\n```", parse_mode='Markdown')

async def handle_message(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Handle free text messages - save to inbox for Claude."""
    if not is_authorized(update.effective_user.id):
        return

    user = update.effective_user
    message = update.message.text
    timestamp = datetime.now().strftime('%Y-%m-%d %H:%M:%S')

    # Append to inbox file
    with open(INBOX_FILE, 'a') as f:
        f.write(f"[{timestamp}] {user.first_name}: {message}\n")

    # Silent save - no reply needed
    logger.info(f"Inbox message from {user.first_name}: {message[:50]}...")

async def handle_photo(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Handle photo messages - download and save for Claude."""
    if not is_authorized(update.effective_user.id):
        return

    user = update.effective_user
    timestamp = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
    file_timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')

    # Create images directory
    images_dir = Path(__file__).parent / 'images'
    images_dir.mkdir(exist_ok=True)

    # Get the largest photo (best quality)
    photo = update.message.photo[-1]
    file = await context.bot.get_file(photo.file_id)

    # Download the image
    filename = f"{file_timestamp}.jpg"
    filepath = images_dir / filename
    await file.download_to_drive(filepath)

    # Get caption if any
    caption = update.message.caption or ""
    caption_text = f" - \"{caption}\"" if caption else ""

    # Log to inbox
    with open(INBOX_FILE, 'a') as f:
        f.write(f"[{timestamp}] {user.first_name}: [IMAGE: {filepath}]{caption_text}\n")

    logger.info(f"Photo saved from {user.first_name}: {filepath}")

async def handle_document(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Handle document/file messages - download and save for Claude."""
    if not is_authorized(update.effective_user.id):
        return

    user = update.effective_user
    timestamp = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
    file_timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')

    # Create files directory
    files_dir = Path(__file__).parent / 'files'
    files_dir.mkdir(exist_ok=True)

    # Get document info
    doc = update.message.document
    original_name = doc.file_name or "unknown"
    file = await context.bot.get_file(doc.file_id)

    # Download with timestamp prefix to avoid collisions
    filename = f"{file_timestamp}_{original_name}"
    filepath = files_dir / filename
    await file.download_to_drive(filepath)

    # Get caption if any
    caption = update.message.caption or ""
    caption_text = f" - \"{caption}\"" if caption else ""

    # Log to inbox
    with open(INBOX_FILE, 'a') as f:
        f.write(f"[{timestamp}] {user.first_name}: [FILE: {filepath}]{caption_text}\n")

    logger.info(f"Document saved from {user.first_name}: {filepath}")

async def unknown(update: Update, context: ContextTypes.DEFAULT_TYPE):
    """Handle unknown commands."""
    if not is_authorized(update.effective_user.id):
        return
    await update.message.reply_text("Unknown command. Use /help for available commands.")

def main():
    """Start the bot."""
    # Create application
    app = Application.builder().token(TOKEN).build()

    # Add handlers
    app.add_handler(CommandHandler("start", start))
    app.add_handler(CommandHandler("help", help_command))
    app.add_handler(CommandHandler("chatid", chatid))
    app.add_handler(CommandHandler("status", status))
    app.add_handler(CommandHandler("pbs", pbs))
    app.add_handler(CommandHandler("pbs_status", pbs_status))
    app.add_handler(CommandHandler("backups", backups))
    app.add_handler(CommandHandler("pbs_errors", pbs_errors))
    app.add_handler(CommandHandler("pbs_gc", pbs_gc))
    app.add_handler(CommandHandler("beszel", beszel))
    app.add_handler(CommandHandler("kuma", kuma))
    app.add_handler(CommandHandler("ping", ping_host))

    # Unknown command handler
    app.add_handler(MessageHandler(filters.COMMAND, unknown))

    # Free text message handler (for messages to Claude)
    app.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, handle_message))

    # Photo handler
    app.add_handler(MessageHandler(filters.PHOTO, handle_photo))

    # Document/file handler
    app.add_handler(MessageHandler(filters.Document.ALL, handle_document))

    # Start polling
    logger.info("Starting Homelab Bot...")
    app.run_polling(allowed_updates=Update.ALL_TYPES)

if __name__ == '__main__':
    main()