from contextlib import asynccontextmanager
from typing import AsyncIterator

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

from app.api.routes import health, resume, analysis
from app.core.config import settings
from app.core.logging import setup_logging

setup_logging()


@asynccontextmanager
async def lifespan(_: FastAPI) -> AsyncIterator[None]:
    """Startup / shutdown hook."""
    # Ensure upload directory exists (config.py also does this at import time,
    # but this is the canonical place for startup side-effects).
    settings.upload_dir.mkdir(parents=True, exist_ok=True)
    yield


app = FastAPI(
    title="AI Resume Reviewer API",
    description=(
        "Hybrid ATS-style resume analysis: rules + embeddings + LLM. "
        "Phase 0/1 — ingestion and extraction only."
    ),
    version="0.1.0",
    lifespan=lifespan,
)

# ── CORS ──────────────────────────────────────────────────────────────────────
# Allow the Vite dev server (8081) and any localhost variant during development.
# In production, lock this to your actual frontend domain.
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=False,
    allow_methods=["*"],
    allow_headers=["*"],
    expose_headers=["X-Session-Id"],
)

# ── Routers ───────────────────────────────────────────────────────────────────
app.include_router(health.router, prefix="/api")
app.include_router(resume.router, prefix="/api")
app.include_router(analysis.router, prefix="/api")