"""Main FastAPI application for Dangerous Pi."""
import asyncio
from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse

from . import config
from .models.database import init_db
from .api import health, pm3, system, wifi, updates, plugins
from .sse import events
from .managers.update_manager import get_update_manager
from .managers.ups_manager import get_ups_manager
from .managers.ble_manager import get_ble_manager, NotificationType
from .managers.plugin_manager import get_plugin_manager


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan manager."""
    # Startup
    print(f"🚀 Starting Dangerous Pi backend...")
    await init_db()
    print(f"✅ Database initialized")

    # Start periodic update checks
    update_manager = get_update_manager()
    update_task = asyncio.create_task(update_manager.start_periodic_checks())
    print(f"✅ Update manager started")

    # Initialize and start BLE manager
    ble_manager = get_ble_manager()
    await ble_manager.initialize()
    if ble_manager.is_available():
        await ble_manager.start_advertising()
        print(f"✅ BLE manager started")
    else:
        print(f"⚠️  BLE not available")

    # Start UPS monitoring
    ups_manager = get_ups_manager()

    # Register UPS event callbacks for SSE notifications and BLE
    async def ups_event_handler(event):
        """Handle UPS events and broadcast via SSE and BLE."""
        event_type = event.get("type")
        data = event.get("data", {})

        if event_type == "battery_warning":
            await events.notify_ups_warning(data["percentage"], data["threshold"])
            await ble_manager.send_notification(
                NotificationType.BATTERY_WARNING,
                f"Battery low: {data['percentage']:.1f}%",
                data
            )
        elif event_type == "battery_low":
            await events.notify_ups_critical(data["percentage"])
            await ble_manager.send_notification(
                NotificationType.BATTERY_CRITICAL,
                f"Battery critical: {data['percentage']:.1f}%",
                data
            )
        elif event_type == "battery_critical":
            await events.notify_ups_shutdown(data.get("delay", 60), data["percentage"])
            await ble_manager.send_notification(
                NotificationType.SHUTDOWN_INITIATED,
                f"Shutdown initiated: {data['percentage']:.1f}% battery",
                data
            )

    ups_manager.register_event_callback(ups_event_handler)
    ups_task = asyncio.create_task(ups_manager.start_monitoring())
    print(f"✅ UPS manager started")

    # Discover and load plugins
    plugin_manager = get_plugin_manager()
    discovered = await plugin_manager.discover_plugins()
    print(f"✅ Plugin manager started ({len(discovered)} plugins discovered)")

    yield

    # Shutdown
    print(f"🛑 Shutting down Dangerous Pi backend...")
    update_task.cancel()
    ups_task.cancel()
    try:
        await update_task
    except asyncio.CancelledError:
        pass
    try:
        await ups_task
    except asyncio.CancelledError:
        pass

    # Close UPS manager I2C connection
    ups_manager.close()


app = FastAPI(
    title="Dangerous Pi API",
    description="Backend API for Proxmark3 management on Raspberry Pi Zero 2 W",
    version="0.1.0",
    lifespan=lifespan
)

# CORS middleware for frontend
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # TODO: Restrict in production
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Include routers
app.include_router(health.router, prefix="/api", tags=["health"])
app.include_router(pm3.router, prefix="/api/pm3", tags=["proxmark3"])
app.include_router(system.router, prefix="/api/system", tags=["system"])
app.include_router(wifi.router, prefix="/api/wifi", tags=["wifi"])
app.include_router(updates.router, prefix="/api/updates", tags=["updates"])
app.include_router(plugins.router, prefix="/api/plugins", tags=["plugins"])
app.include_router(events.router, prefix="/sse", tags=["events"])


@app.exception_handler(Exception)
async def global_exception_handler(request, exc):
    """Global exception handler."""
    return JSONResponse(
        status_code=500,
        content={"error": str(exc)}
    )


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(
        "app.backend.main:app",
        host=config.HOST,
        port=config.PORT,
        reload=True
    )