from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from prometheus_fastapi_instrumentator import Instrumentator
from webapi.config.app_settings import site_settings
from loguru import logger
import os


def create_app() -> FastAPI:
    """
    Create and configure the FastAPI application
    """
    app = FastAPI(
        title="Metrics Service API",
        description="Metrics Service for Freeleaps Platform",
        version="1.0.0",
        docs_url="/docs",
        redoc_url="/redoc"
    )
    
    # Add CORS middleware
    app.add_middleware(
        CORSMiddleware,
        allow_origins=["*"],
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )
    
    # Setup logging
    setup_logging()
    
    # Setup Prometheus metrics
    Instrumentator().instrument(app).expose(app)
    
    # Include routers
    # from webapi.routes import health, api
    # app.include_router(health.router, prefix="/health", tags=["health"])
    # app.include_router(api.router, prefix="/api/metrics", tags=["metrics"])
    # Note: Registration router is included in main.py
    
    return app


def setup_logging():
    """
    Setup logging configuration
    """
    # Create log directory if it doesn't exist
    log_dir = site_settings.LOG_BASE_PATH
    os.makedirs(log_dir, exist_ok=True)
    
    # Configure loguru
    logger.add(
        f"{log_dir}/{site_settings.BACKEND_LOG_FILE_NAME}.log",
        rotation="1 day",
        retention="30 days",
        level="INFO",
        format="{time:YYYY-MM-DD HH:mm:ss} | {level} | {name}:{function}:{line} | {message}"
    )
    
    logger.add(
        f"{log_dir}/{site_settings.APPLICATION_ACTIVITY_LOG}.log",
        rotation="1 day",
        retention="30 days",
        level="INFO",
        format="{time:YYYY-MM-DD HH:mm:ss} | {level} | {name}:{function}:{line} | {message}",
        filter=lambda record: record["level"].name == "INFO"
    )