"""FastAPI application entry point."""

import sys
from contextlib import asynccontextmanager
from pathlib import Path

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse, FileResponse
from fastapi.staticfiles import StaticFiles

from wled_controller import __version__
from wled_controller.api import router
from wled_controller.api.routes import init_dependencies
from wled_controller.config import get_config
from wled_controller.core.processor_manager import ProcessorManager
from wled_controller.storage import DeviceStore
from wled_controller.storage.template_store import TemplateStore
from wled_controller.utils import setup_logging, get_logger

# Initialize logging
setup_logging()
logger = get_logger(__name__)

# Get configuration
config = get_config()

# Initialize storage and processing
device_store = DeviceStore(config.storage.devices_file)
template_store = TemplateStore(config.storage.templates_file)
processor_manager = ProcessorManager()


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan manager.

    Handles startup and shutdown events.
    """
    # Startup
    logger.info(f"Starting WLED Screen Controller v{__version__}")
    logger.info(f"Python version: {sys.version}")
    logger.info(f"Server listening on {config.server.host}:{config.server.port}")

    # Validate authentication configuration
    if not config.auth.api_keys:
        logger.error("=" * 70)
        logger.error("CRITICAL: No API keys configured!")
        logger.error("Authentication is REQUIRED for all API requests.")
        logger.error("Please add API keys to your configuration:")
        logger.error("  1. Generate keys: openssl rand -hex 32")
        logger.error("  2. Add to config/default_config.yaml under auth.api_keys")
        logger.error("  3. Format: label: \"your-generated-key\"")
        logger.error("=" * 70)
        raise RuntimeError("No API keys configured - server cannot start without authentication")

    # Log authentication status
    logger.info(f"API Authentication: ENFORCED ({len(config.auth.api_keys)} clients configured)")
    client_labels = ", ".join(config.auth.api_keys.keys())
    logger.info(f"Authorized clients: {client_labels}")
    logger.info("All API requests require valid Bearer token authentication")

    # Initialize API dependencies
    init_dependencies(device_store, template_store, processor_manager)

    # Load existing devices into processor manager
    devices = device_store.get_all_devices()
    for device in devices:
        try:
            processor_manager.add_device(
                device_id=device.id,
                device_url=device.url,
                led_count=device.led_count,
                settings=device.settings,
                calibration=device.calibration,
                capture_template_id=device.capture_template_id,
            )
            logger.info(f"Loaded device: {device.name} ({device.id})")
        except Exception as e:
            logger.error(f"Failed to load device {device.id}: {e}")

    logger.info(f"Loaded {len(devices)} devices from storage")

    # Start background health monitoring for all devices
    await processor_manager.start_health_monitoring()

    yield

    # Shutdown
    logger.info("Shutting down WLED Screen Controller")

    # Stop all processing
    try:
        await processor_manager.stop_all()
        logger.info("Stopped all processors")
    except Exception as e:
        logger.error(f"Error stopping processors: {e}")

# Create FastAPI application
app = FastAPI(
    title="WLED Screen Controller",
    description="Control WLED devices based on screen content for ambient lighting",
    version=__version__,
    lifespan=lifespan,
    docs_url="/docs",
    redoc_url="/redoc",
    openapi_url="/openapi.json",
)

# Configure CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=config.server.cors_origins,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Include API routes
app.include_router(router)

# Mount static files
static_path = Path(__file__).parent / "static"
if static_path.exists():
    app.mount("/static", StaticFiles(directory=str(static_path)), name="static")
    logger.info(f"Mounted static files from {static_path}")
else:
    logger.warning(f"Static files directory not found: {static_path}")


@app.exception_handler(Exception)
async def global_exception_handler(request, exc):
    """Global exception handler for unhandled errors."""
    logger.error(f"Unhandled exception: {exc}", exc_info=True)

    return JSONResponse(
        status_code=500,
        content={
            "error": "InternalServerError",
            "message": "An unexpected error occurred",
            "detail": str(exc) if config.server.log_level == "DEBUG" else None,
        },
    )


@app.get("/")
async def root():
    """Serve the web UI dashboard."""
    static_path = Path(__file__).parent / "static" / "index.html"
    if static_path.exists():
        return FileResponse(static_path)

    # Fallback to JSON if static files not found
    return {
        "name": "WLED Screen Controller",
        "version": __version__,
        "docs": "/docs",
        "health": "/health",
        "api": "/api/v1",
    }


if __name__ == "__main__":
    import uvicorn

    uvicorn.run(
        "wled_controller.main:app",
        host=config.server.host,
        port=config.server.port,
        log_level=config.server.log_level.lower(),
        reload=False,  # Disabled due to watchfiles infinite reload loop
    )