blackroad-operating-system/backend/app/main.py

"""Main FastAPI application"""
from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse, FileResponse
from fastapi.staticfiles import StaticFiles
from contextlib import asynccontextmanager
import time
import os

from app.config import settings
from app.database import async_engine, Base
from app.redis_client import close_redis
from app.routers import auth, email, social, video, files, blockchain, ai_chat, devices, miner
from app.services.crypto import rotate_plaintext_wallet_keys


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan events"""
    # Startup
    print("Starting BlackRoad Operating System Backend...")

    # Create database tables
    async with async_engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)

    print("Database tables created successfully")
    print(f"Server running on {settings.ENVIRONMENT} mode")

    # Re-encrypt any legacy plaintext wallet keys before serving requests
    updated_users, updated_wallets = await rotate_plaintext_wallet_keys()
    if updated_users or updated_wallets:
        print(
            f"Re-encrypted {updated_users} user keys and {updated_wallets} wallet keys"
        )

    yield

    # Shutdown
    print("Shutting down...")
    await close_redis()
    await async_engine.dispose()
    print("Shutdown complete")


# Create FastAPI app
app = FastAPI(
    title=settings.APP_NAME,
    version=settings.APP_VERSION,
    description="Backend API for BlackRoad Operating System - A Windows 95-inspired web OS",
    lifespan=lifespan,
    docs_url="/api/docs",
    redoc_url="/api/redoc",
    openapi_url="/api/openapi.json"
)

# CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=settings.allowed_origins_list,
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)


# Request timing middleware
@app.middleware("http")
async def add_process_time_header(request: Request, call_next):
    """Add processing time header to responses"""
    start_time = time.time()
    response = await call_next(request)
    process_time = time.time() - start_time
    response.headers["X-Process-Time"] = str(process_time)
    return response


# Error handlers
@app.exception_handler(404)
async def not_found_handler(request: Request, exc):
    """Handle 404 errors"""
    return JSONResponse(
        status_code=404,
        content={"detail": "Resource not found"}
    )


@app.exception_handler(500)
async def internal_error_handler(request: Request, exc):
    """Handle 500 errors"""
    return JSONResponse(
        status_code=500,
        content={"detail": "Internal server error"}
    )


# Include routers
app.include_router(auth.router)
app.include_router(email.router)
app.include_router(social.router)
app.include_router(video.router)
app.include_router(files.router)
app.include_router(blockchain.router)
app.include_router(ai_chat.router)
app.include_router(devices.router)
app.include_router(miner.router)


# Static file serving for the BlackRoad OS front-end
static_dir = os.path.join(os.path.dirname(os.path.dirname(__file__)), "static")
if os.path.exists(static_dir):
    # Mount static files (JS, CSS, images)
    app.mount("/static", StaticFiles(directory=static_dir, html=True), name="static")

    # Serve index.html at root
    @app.get("/")
    async def serve_frontend():
        """Serve the BlackRoad OS desktop interface"""
        index_path = os.path.join(static_dir, "index.html")
        if os.path.exists(index_path):
            return FileResponse(index_path)
        return {
            "name": settings.APP_NAME,
            "version": settings.APP_VERSION,
            "environment": settings.ENVIRONMENT,
            "docs": "/api/docs",
            "status": "operational",
            "note": "Front-end not found. API is operational."
        }
else:
    # Fallback if static directory doesn't exist
    @app.get("/")
    async def root():
        """Root endpoint"""
        return {
            "name": settings.APP_NAME,
            "version": settings.APP_VERSION,
            "environment": settings.ENVIRONMENT,
            "docs": "/api/docs",
            "status": "operational",
            "note": "API-only mode. Front-end not deployed."
        }


# Health check
@app.get("/health")
async def health_check():
    """Health check endpoint"""
    return {
        "status": "healthy",
        "timestamp": time.time()
    }


# API info
@app.get("/api")
async def api_info():
    """API information"""
    return {
        "name": settings.APP_NAME,
        "version": settings.APP_VERSION,
        "endpoints": {
            "auth": "/api/auth",
            "email": "/api/email",
            "social": "/api/social",
            "videos": "/api/videos",
            "files": "/api/files",
            "blockchain": "/api/blockchain",
            "ai_chat": "/api/ai-chat",
            "devices": "/api/devices",
            "miner": "/api/miner"
        },
        "documentation": {
            "swagger": "/api/docs",
            "redoc": "/api/redoc",
            "openapi": "/api/openapi.json"
        }
    }