from fastapi import FastAPI, Request
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager
import os
import logging

from config.settings import get_settings
from routers import mentors, recommend, health
from services.embedding_service import EmbeddingService

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

settings = get_settings()

@asynccontextmanager
async def lifespan(app: FastAPI):
    logger.info("Starting application...")
    try:
        logger.info("Loading embedding service...")
        embedding_service = EmbeddingService()
        app.state.embedding_service = embedding_service
        logger.info("Application started successfully")
    except Exception as e:
        logger.error(f"Failed to start application: {str(e)}", exc_info=True)
        raise
    yield
    logger.info("Shutting down application...")
    if hasattr(app.state, 'embedding_service'):
        del app.state.embedding_service

app = FastAPI(
    title="MentorMe AI Recommendation Server",
    description="AI-powered mentor-mentee recommendation using Vietnamese_Embedding and Pinecone",
    version="1.0.0",
    lifespan=lifespan
)

cors_origins = settings.CORS_ORIGINS
if not cors_origins:
    cors_origins = ["*"]

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

app.include_router(health.router, prefix="/api/v1", tags=["Health"])
app.include_router(mentors.router, prefix="/api/v1", tags=["Mentors"])
app.include_router(recommend.router, prefix="/api/v1", tags=["Recommendations"])

@app.middleware("http")
async def log_requests(request: Request, call_next):
    logger.info(f"Incoming request: {request.method} {request.url}")
    logger.debug(f"Headers: {dict(request.headers)}")
    response = await call_next(request)
    logger.info(f"Response status: {response.status_code}")
    return response

@app.get("/")
async def root():
    return {
        "message": "MentorMe AI Recommendation Server",
        "version": "1.0.0",
        "status": "running",
        "endpoints": {
            "health": "/api/v1/health",
            "upsert_mentor": "/api/v1/mentors/upsert",
            "recommend": "/api/v1/recommend"
        }
    }

@app.post("/test-post")
async def test_post(request: Request):
    logger.info(f"Test POST received: {request.method} {request.url}")
    logger.info(f"Headers: {dict(request.headers)}")
    body = await request.body()
    logger.info(f"Body: {body}")
    return {
        "message": "POST request received successfully",
        "method": request.method,
        "url": str(request.url),
        "headers": dict(request.headers)
    }