#!/usr/bin/env python3
"""
NFOGuard - Automated NFO file management for Radarr and Sonarr
Modular architecture with webhook processing and intelligent date handling
"""
import os
import sys
import signal
from pathlib import Path
from datetime import datetime, timezone

import uvicorn
from fastapi import FastAPI

# Import configuration first
from config.settings import config
from utils.logging import _log

# Import core components
from core.database import NFOGuardDatabase
from core.nfo_manager import NFOManager
from core.path_mapper import PathMapper

# Import clients
from clients.external_clients import ExternalClientManager

# Import processors
from processors.tv_processor import TVProcessor
from processors.movie_processor import MovieProcessor

# Import webhook handling
from webhooks.webhook_batcher import WebhookBatcher

# Import API routes
from api.routes import register_routes


def get_version() -> str:
    """Get application version"""
    try:
        version = (Path(__file__).parent / "VERSION").read_text().strip()
    except:
        version = "0.1.0"

    # Check if running from dev branch (detect at runtime)
    try:
        # Try to read git branch from .git/HEAD
        git_head_path = Path(__file__).parent / ".git" / "HEAD"
        if git_head_path.exists():
            head_content = git_head_path.read_text().strip()
            if "ref: refs/heads/dev" in head_content:
                version = f"{version}-dev"
            elif head_content.startswith("ref: refs/heads/"):
                # Extract branch name for other branches
                branch = head_content.split("refs/heads/")[-1]
                if branch != "main":
                    version = f"{version}-{branch}"
    except Exception:
        # If git detection fails, that's fine - use base version
        pass

    # Check for build source (only add -gitea for local Gitea builds)
    build_source = os.environ.get("BUILD_SOURCE", "")
    if build_source == "gitea":
        if "gitea" not in version:  # Don't double-add gitea suffix
            version = f"{version}-gitea"

    return version


def create_app() -> FastAPI:
    """Create and configure the FastAPI application"""
    version = get_version()
    
    app = FastAPI(
        title="NFOGuard",
        description="Webhook server for preserving media import dates",
        version=version
    )
    
    return app


def initialize_components():
    """Initialize all application components"""
    start_time = datetime.now(timezone.utc)
    
    # Initialize core components
    db = NFOGuardDatabase(config.db_path)
    nfo_manager = NFOManager(config.manager_brand, config.debug)
    path_mapper = PathMapper(config)
    
    # Initialize processors
    tv_processor = TVProcessor(db, nfo_manager, path_mapper)
    movie_processor = MovieProcessor(db, nfo_manager, path_mapper)
    
    # Initialize webhook batcher with nfo_manager for comprehensive IMDb detection
    batcher = WebhookBatcher(nfo_manager)
    batcher.set_processors(tv_processor, movie_processor)
    
    return {
        "db": db,
        "nfo_manager": nfo_manager,
        "path_mapper": path_mapper,
        "tv_processor": tv_processor,
        "movie_processor": movie_processor,
        "batcher": batcher,
        "start_time": start_time,
        "config": config,
        "version": get_version()
    }


def signal_handler(signum, frame):
    """Handle shutdown signals gracefully"""
    _log("INFO", f"Received signal {signum}, shutting down gracefully...")
    
    # Get the global dependencies if they exist
    if hasattr(signal_handler, 'dependencies') and signal_handler.dependencies:
        deps = signal_handler.dependencies
        
        # Shutdown webhook batcher cleanly
        if 'batcher' in deps:
            try:
                _log("INFO", "Shutting down webhook batcher...")
                deps['batcher'].shutdown()
            except Exception as e:
                _log("WARNING", f"Error during batcher shutdown: {e}")
        
        # Close database connection
        if 'db' in deps:
            try:
                _log("INFO", "Closing database connection...")
                deps['db'].close()
            except Exception as e:
                _log("WARNING", f"Error closing database: {e}")
    
    _log("INFO", "Graceful shutdown complete")
    sys.exit(0)


def main():
    """Main application entry point"""
    # Register signal handlers for graceful shutdown
    signal.signal(signal.SIGTERM, signal_handler)
    signal.signal(signal.SIGINT, signal_handler)
    
    version = get_version()
    
    _log("INFO", "Starting NFOGuard")
    _log("INFO", f"Version: {version}")
    _log("INFO", f"TV paths: {[str(p) for p in config.tv_paths]}")
    _log("INFO", f"Movie paths: {[str(p) for p in config.movie_paths]}")
    _log("INFO", f"Database: {config.db_path}")
    _log("INFO", f"Config: manage_nfo={config.manage_nfo}, fix_mtimes={config.fix_dir_mtimes}")
    _log("INFO", f"Movie priority: {config.movie_priority}")
    
    # Create FastAPI app
    app = create_app()
    
    # Initialize components
    dependencies = initialize_components()
    
    # Store dependencies globally for signal handler access
    signal_handler.dependencies = dependencies
    
    # Register routes
    register_routes(app, dependencies)
    
    try:
        uvicorn.run(
            app,
            host="0.0.0.0", 
            port=int(os.environ.get("PORT", "8080")),
            reload=False,
            access_log=False,  # Reduce logging overhead
            server_header=False,  # Reduce response overhead
            timeout_graceful_shutdown=15  # Give more time for graceful shutdown
        )
    except KeyboardInterrupt:
        _log("INFO", "NFOGuard stopped by user")
    except Exception as e:
        _log("ERROR", f"NFOGuard crashed: {e}")
        sys.exit(1)
    finally:
        # Ensure cleanup happens even if uvicorn doesn't trigger signal handler
        if hasattr(signal_handler, 'dependencies') and signal_handler.dependencies:
            deps = signal_handler.dependencies
            
            if 'batcher' in deps:
                try:
                    deps['batcher'].shutdown()
                except Exception:
                    pass
            
            if 'db' in deps:
                try:
                    deps['db'].close()
                except Exception:
                    pass


if __name__ == "__main__":
    main()