"""FastAPI application entry point for Data Entry App."""

import sys
import logging
import threading
from pathlib import Path
from contextlib import asynccontextmanager

# Load .env file BEFORE any imports that use os.getenv()
from dotenv import load_dotenv
load_dotenv()

from fastapi import FastAPI

# Configure logging to show INFO level messages
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    datefmt='%H:%M:%S'
)
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles

# Add shared modules to path
project_root = Path(__file__).parent.parent.parent.parent
sys.path.insert(0, str(project_root / "shared"))

from app.config import settings
from app.db.database import init_db

# Import Oracle pool for auth service
from database.oracle_pool import oracle_pool


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan - startup and shutdown events."""
    # Startup
    print(f"Starting {settings.app_name} v{settings.app_version}")

    # Initialize Oracle pool (required for authentication)
    try:
        await oracle_pool.initialize()
        print("Oracle pool initialized")
    except Exception as e:
        print(f"Warning: Oracle pool initialization failed: {e}")
        print("Authentication will not work without Oracle connection")

    # Initialize SQLite database
    await init_db()
    print("Database initialized")

    # Ensure upload directory exists
    settings.upload_path_resolved
    print(f"Upload path: {settings.upload_path_resolved}")

    # Pre-initialize OCR engine in background (PaddleOCR takes 15-20s)
    def init_ocr_background():
        try:
            from app.services.ocr_service import ocr_service
            ocr_service.ocr_engine._init_paddle_lazy()
            print("OCR engine ready")
        except Exception as e:
            print(f"Warning: OCR engine pre-load failed: {e}")

    print("Starting OCR engine pre-load (background)...")
    threading.Thread(target=init_ocr_background, daemon=True).start()

    yield

    # Shutdown
    print("Shutting down...")
    try:
        await oracle_pool.close()
        print("Oracle pool closed")
    except Exception as e:
        print(f"Warning: Oracle pool close failed: {e}")


# Create FastAPI app
app = FastAPI(
    title=settings.app_name,
    version=settings.app_version,
    description="API pentru introducere bonuri fiscale cu workflow de aprobare",
    lifespan=lifespan,
)

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

# Authentication middleware
from auth.middleware import AuthenticationMiddleware

app.add_middleware(
    AuthenticationMiddleware,
    excluded_paths=["/docs", "/redoc", "/openapi.json", "/health", "/", "/api/auth/login", "/api/auth/refresh"]
)

# Mount static files for uploads (optional - can serve through nginx in prod)
uploads_path = Path(settings.upload_path)
if uploads_path.exists():
    app.mount("/uploads", StaticFiles(directory=str(uploads_path)), name="uploads")


# Health check endpoint
@app.get("/health")
async def health_check():
    """Health check endpoint."""
    return {
        "status": "healthy",
        "app": settings.app_name,
        "version": settings.app_version,
    }


# Import and include routers
from app.routers import receipts, ocr, nomenclature

app.include_router(receipts.router, prefix="/api/receipts", tags=["receipts"])
app.include_router(ocr.router, prefix="/api/ocr", tags=["ocr"])
app.include_router(nomenclature.router, prefix="/api/nomenclature", tags=["nomenclature"])

# Auth router
from auth.routes import create_auth_router

auth_router = create_auth_router(prefix="")  # No prefix - we set it in include_router
app.include_router(auth_router, prefix="/api/auth", tags=["auth"])


# Root endpoint
@app.get("/")
async def root():
    """Root endpoint - API information."""
    return {
        "name": settings.app_name,
        "version": settings.app_version,
        "docs": "/docs",
        "health": "/health",
    }