import os
from contextlib import asynccontextmanager

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

from app.core.config import settings
from app.routers import auth
from app import models  # Import all models so SQLModel metadata registers them

from fastapi_cache import FastAPICache
from fastapi_cache.backends.redis import RedisBackend
from redis import asyncio as aioredis

from slowapi import _rate_limit_exceeded_handler
from slowapi.errors import RateLimitExceeded
from slowapi.middleware import SlowAPIMiddleware
from app.core.limiter import limiter

@asynccontextmanager
async def lifespan(app: FastAPI):
    """Lifespan events for the FastAPI application."""
    # Conecta no Redis via variável de ambiente (Upstash em produção, localhost em dev)
    redis_url = os.environ.get("REDIS_URL", "redis://localhost:6379")
    redis = aioredis.from_url(redis_url, encoding="utf-8", decode_responses=True)
    FastAPICache.init(RedisBackend(redis), prefix="docboard:", expire=300)
    yield


app = FastAPI(
    title=settings.APP_NAME,
    description="Backend API for the DocBoard application.",
    version="0.1.0",
    lifespan=lifespan,
    docs_url="/docs" if settings.DEBUG else None,
    redoc_url="/redoc" if settings.DEBUG else None,
    openapi_url="/openapi.json" if settings.DEBUG else None,
)

app.state.limiter = limiter
app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)
app.add_middleware(SlowAPIMiddleware)

# ─── CORS ─────────────────────────────────────────────────────────────────────
app.add_middleware(
    CORSMiddleware,
    allow_origins=[
        os.environ.get("ALLOWED_ORIGINS", "http://localhost:5173"),
    ],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

app.add_middleware(GZipMiddleware, minimum_size=1000)

# ─── Routers ──────────────────────────────────────────────────────────────────
from app.routers import auth, procedures, resources, dashboard, safety, teams, growth, users

app.include_router(auth.router)
app.include_router(procedures.router)
app.include_router(resources.router)
app.include_router(dashboard.router)
app.include_router(safety.router)
app.include_router(teams.router)
app.include_router(growth.router)
app.include_router(users.router)

@app.get("/", tags=["Health"])
def health_check():
    return {"status": "ok", "app": settings.APP_NAME}