"""
FastAPI Application Factory
Main entry point for para.AI API
"""
from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import JSONResponse
from contextlib import asynccontextmanager
import logging
import time
from datetime import datetime

from api.config import settings
from api.routes import debug_routes, process_routes, status_routes, health_routes


logging.basicConfig(
    level=settings.LOG_LEVEL,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Lifespan events"""
    logger.info(f"🚀 Starting {settings.APP_NAME} v{settings.APP_VERSION}")
    logger.info(f"📊 Environment: {'DEBUG' if settings.DEBUG else 'PRODUCTION'}")
    logger.info(f"🤖 LLM Model: {settings.LLM_MODEL}")

    yield

    logger.info("🛑 Shutting down API")


def create_app() -> FastAPI:
    """Factory function to create FastAPI app"""

    app = FastAPI(
        title=settings.APP_NAME,
        version=settings.APP_VERSION,
        description="API para análise jurisprudencial com LLMs - Sistema de 9 Especialistas",
        lifespan=lifespan,
        docs_url="/docs" if settings.DEBUG else None,
        redoc_url="/redoc" if settings.DEBUG else None,
    )

    app.add_middleware(
        CORSMiddleware,
        allow_origins=settings.CORS_ORIGINS,
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    @app.middleware("http")
    async def add_process_time_header(request: Request, call_next):
        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

    @app.exception_handler(Exception)
    async def global_exception_handler(request: Request, exc: Exception):
        logger.error(f"Global exception: {exc}", exc_info=True)
        return JSONResponse(
            status_code=500,
            content={
                "error": "Internal Server Error",
                "detail": str(exc) if settings.DEBUG else "An error occurred",
                "timestamp": datetime.now().isoformat(),
                "path": str(request.url)
            }
        )

    app.include_router(health_routes.router, prefix="/health", tags=["Health"])
    app.include_router(process_routes.router, prefix="/process", tags=["Process"])
    app.include_router(status_routes.router, prefix="/status", tags=["Status"])

    if settings.DEBUG:
        app.include_router(debug_routes.router, prefix="/debug", tags=["Debug"])

    @app.get("/")
    async def root():
        return {
            "app": settings.APP_NAME,
            "version": settings.APP_VERSION,
            "status": "running",
            "timestamp": datetime.now().isoformat(),
            "docs": "/docs" if settings.DEBUG else "disabled"
        }

    return app


app = create_app()


if __name__ == "__main__":
    import uvicorn
    uvicorn.run(
        "api.main:app",
        host=settings.API_HOST,
        port=settings.API_PORT,
        reload=settings.DEBUG
    )