"""FastAPI application factory"""
import logging
from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from luxx.config import config
from luxx.database import init_db
from luxx.routes import api_router

logger = logging.getLogger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan manager"""
    # Import all models to ensure they are registered with Base
    from luxx.models import User, Conversation, Message, Project, LLMProvider  # noqa
    init_db()
    
    # Create default test user if not exists
    from luxx.database import SessionLocal
    from luxx.models import User
    from luxx.utils.helpers import hash_password
    
    db = SessionLocal()
    try:
        default_user = db.query(User).filter(User.username == "admin").first()
        if not default_user:
            default_user = User(
                username="admin",
                password_hash=hash_password("admin"),
                role="admin"
            )
            db.add(default_user)
            db.commit()
            logger.info("Default admin user created: admin / admin")
    finally:
        db.close()
    
    # Import and register tools
    from luxx.tools.builtin import crawler, code, data
    yield


def create_app() -> FastAPI:
    """Create FastAPI application"""
    app = FastAPI(
        title="luxx API",
        description="Intelligent chat backend API with multi-model support, streaming responses, and tool calling",
        version="1.0.0",
        lifespan=lifespan
    )
    
    # Configure CORS
    app.add_middleware(
        CORSMiddleware,
        allow_origins=["*"],  # Should be restricted in production
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )
    
    # Register routes
    app.include_router(api_router, prefix="/api")
    
    # Health check
    @app.get("/health")
    async def health_check():
        return {"status": "healthy", "service": "luxx"}
    
    @app.get("/")
    async def root():
        return {
            "service": "luxx API",
            "version": "1.0.0",
            "docs": "/docs"
        }
    
    return app


# Create application instance
app = create_app()