"""
Cosmo - Deep Space Explorer Backend API
FastAPI application entry point
"""
import sys
from pathlib import Path

# Add backend directory to Python path for direct execution
backend_dir = Path(__file__).resolve().parent.parent
if str(backend_dir) not in sys.path:
    sys.path.insert(0, str(backend_dir))

import logging
from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles

from app.config import settings
from app.api.auth import router as auth_router
from app.api.user import router as user_router
from app.api.system import router as system_router
from app.api.danmaku import router as danmaku_router
from app.api.task import router as task_router
from app.api.cache import router as cache_router
from app.api.celestial_static import router as celestial_static_router
from app.api.celestial_body import router as celestial_body_router
from app.api.celestial_resource import router as celestial_resource_router
from app.api.celestial_orbit import router as celestial_orbit_router
from app.api.nasa_download import router as nasa_download_router
from app.api.celestial_position import router as celestial_position_router
from app.services.redis_cache import redis_cache
from app.services.cache_preheat import preheat_all_caches
from app.database import close_db

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
)

logger = logging.getLogger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan manager - startup and shutdown events"""
    # Startup
    logger.info("=" * 60)
    logger.info("Starting Cosmo Backend API...")
    logger.info("=" * 60)

    # Connect to Redis
    await redis_cache.connect()

    # Initialize database tables (create if not exist)
    from app.database import engine, Base
    from app.models.db import SystemSettings  # Import to register the model
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    logger.info("✓ Database tables initialized")

    # Initialize default system settings
    from app.database import AsyncSessionLocal
    from app.services.system_settings_service import system_settings_service
    async with AsyncSessionLocal() as db:
        await system_settings_service.initialize_default_settings(db)
        await db.commit()
        logger.info("✓ Default system settings initialized")

    # Preheat caches (load from database to Redis)
    await preheat_all_caches()

    logger.info("✓ Application started successfully")
    logger.info("=" * 60)

    yield

    # Shutdown
    logger.info("=" * 60)
    logger.info("Shutting down Cosmo Backend API...")

    # Disconnect Redis
    await redis_cache.disconnect()

    # Close database connections
    await close_db()

    logger.info("✓ Application shutdown complete")
    logger.info("=" * 60)


# Create FastAPI app
app = FastAPI(
    title=settings.app_name,
    description="Backend API for deep space probe visualization using NASA JPL Horizons data",
    version="1.0.0",
    lifespan=lifespan,
)

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

# Include routers
app.include_router(auth_router, prefix=settings.api_prefix)
app.include_router(user_router, prefix=settings.api_prefix)
app.include_router(system_router, prefix=settings.api_prefix)
app.include_router(danmaku_router, prefix=settings.api_prefix)

# Celestial body related routers
app.include_router(celestial_body_router, prefix=settings.api_prefix)
app.include_router(celestial_position_router, prefix=settings.api_prefix)
app.include_router(celestial_resource_router, prefix=settings.api_prefix)
app.include_router(celestial_orbit_router, prefix=settings.api_prefix)
app.include_router(celestial_static_router, prefix=settings.api_prefix)

# Admin and utility routers
app.include_router(cache_router, prefix=settings.api_prefix)
app.include_router(nasa_download_router, prefix=settings.api_prefix)
app.include_router(task_router, prefix=settings.api_prefix)

# Mount static files for uploaded resources
upload_dir = Path(__file__).parent.parent / "upload"
upload_dir.mkdir(exist_ok=True)
app.mount("/upload", StaticFiles(directory=str(upload_dir)), name="upload")
logger.info(f"Static files mounted at /upload -> {upload_dir}")

# Mount public assets directory
public_assets_dir = Path(__file__).parent.parent / "public" / "assets"
public_assets_dir.mkdir(parents=True, exist_ok=True)
app.mount("/public/assets", StaticFiles(directory=str(public_assets_dir)), name="public_assets")
logger.info(f"Public assets mounted at /public/assets -> {public_assets_dir}")


@app.get("/")
async def root():
    """Root endpoint"""
    return {
        "app": settings.app_name,
        "version": "1.0.0",
        "docs": "/docs",
        "api": settings.api_prefix,
    }


@app.get("/health")
async def health():
    """Health check endpoint with service status"""
    from app.services.redis_cache import redis_cache

    redis_stats = await redis_cache.get_stats()

    return {
        "status": "healthy",
        "redis": redis_stats,
        "database": "connected",  # If we got here, database is working
    }


if __name__ == "__main__":
    import uvicorn

    uvicorn.run(
        "app.main:app",
        host="0.0.0.0",
        port=8000,
        reload=True,
        log_level="info",
    )