# services/recipes/app/main.py
"""
Recipe Service - FastAPI application
Handles recipe management, production planning, and inventory consumption tracking
"""

from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.middleware.gzip import GZipMiddleware
from fastapi.responses import JSONResponse
import time
import logging
from contextlib import asynccontextmanager

from .core.config import settings
from .core.database import db_manager
from .api import recipes, production, ingredients


# Configure logging
logging.basicConfig(
    level=getattr(logging, settings.LOG_LEVEL.upper()),
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
)
logger = logging.getLogger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Application lifespan events"""
    # Startup
    logger.info(f"Starting {settings.SERVICE_NAME} service v{settings.SERVICE_VERSION}")
    
    # Create database tables
    try:
        db_manager.create_all_tables()
        logger.info("Database tables created successfully")
    except Exception as e:
        logger.error(f"Failed to create database tables: {e}")
        
    yield
    
    # Shutdown
    logger.info(f"Shutting down {settings.SERVICE_NAME} service")


# Create FastAPI application
app = FastAPI(
    title="Recipe Management Service",
    description="Comprehensive recipe management, production planning, and inventory consumption tracking for bakery operations",
    version=settings.SERVICE_VERSION,
    lifespan=lifespan,
    docs_url="/docs" if settings.DEBUG else None,
    redoc_url="/redoc" if settings.DEBUG else None,
)

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

app.add_middleware(GZipMiddleware, minimum_size=1000)


# 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


# Global exception handler
@app.exception_handler(Exception)
async def global_exception_handler(request: Request, exc: Exception):
    """Global exception handler"""
    logger.error(f"Global exception on {request.url}: {exc}", exc_info=True)
    return JSONResponse(
        status_code=500,
        content={
            "detail": "Internal server error",
            "error": str(exc) if settings.DEBUG else "An unexpected error occurred"
        }
    )


# Health check endpoint
@app.get("/health")
async def health_check():
    """Health check endpoint"""
    try:
        # Test database connection
        with db_manager.get_session() as db:
            db.execute("SELECT 1")
        
        return {
            "status": "healthy",
            "service": settings.SERVICE_NAME,
            "version": settings.SERVICE_VERSION,
            "environment": settings.ENVIRONMENT
        }
    except Exception as e:
        logger.error(f"Health check failed: {e}")
        return JSONResponse(
            status_code=503,
            content={
                "status": "unhealthy",
                "service": settings.SERVICE_NAME,
                "version": settings.SERVICE_VERSION,
                "error": str(e)
            }
        )


# Include API routers
app.include_router(
    recipes.router,
    prefix=f"{settings.API_V1_PREFIX}/recipes",
    tags=["recipes"]
)

app.include_router(
    production.router,
    prefix=f"{settings.API_V1_PREFIX}/production",
    tags=["production"]
)

app.include_router(
    ingredients.router,
    prefix=f"{settings.API_V1_PREFIX}/ingredients",
    tags=["ingredients"]
)


@app.get("/")
async def root():
    """Root endpoint"""
    return {
        "service": settings.SERVICE_NAME,
        "version": settings.SERVICE_VERSION,
        "status": "running",
        "docs_url": "/docs" if settings.DEBUG else None
    }


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(
        "main:app",
        host="0.0.0.0",
        port=8000,
        reload=settings.DEBUG,
        log_level=settings.LOG_LEVEL.lower()
    )