import asyncio
import os
from contextlib import asynccontextmanager

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from src.core.config import MAX_CONCURRENT_INFERENCES
from src.core.logging import log, init_logging_session, close_logging_session
from src.api import danger, explorer, search, system, upload

@asynccontextmanager
async def lifespan(app: FastAPI):
    await init_logging_session()
    log("INFO", "server.startup", message="Loading AI models...")
    
    from src.services.ai_manager import AIModelManager
    
    loop = asyncio.get_event_loop()
    app.state.ai = await loop.run_in_executor(None, AIModelManager)
    app.state.ai_semaphore = asyncio.Semaphore(MAX_CONCURRENT_INFERENCES)

    log("INFO", "server.ready", message="All models loaded. API ready.")
    yield
    
    log("INFO", "server.shutdown", message="API shutting down.")
    await close_logging_session()

app = FastAPI(lifespan=lifespan)

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"], # Update this to your frontend URL in production
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

os.makedirs("temp_uploads", exist_ok=True)

app.include_router(system.router)
app.include_router(upload.router)
app.include_router(search.router)
app.include_router(explorer.router)
app.include_router(danger.router)