from fastapi import FastAPI, Request
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from fastapi.exceptions import HTTPException
from starlette.middleware.base import BaseHTTPMiddleware

from database import init_db
from routers import clients, devis, factures
from routers import auth as auth_router
from config import settings

app = FastAPI(title=settings.app_name)

app.mount("/static", StaticFiles(directory="static"), name="static")
templates = Jinja2Templates(directory="templates")

app.include_router(auth_router.router)
app.include_router(clients.router)
app.include_router(devis.router)
app.include_router(factures.router)


# ── Middleware : current_user dans request.state ───────────────────────────────

class AuthMiddleware(BaseHTTPMiddleware):
    async def dispatch(self, request: Request, call_next):
        from database import SessionLocal
        from auth import redirect_if_not_logged
        db = SessionLocal()
        try:
            request.state.current_user = redirect_if_not_logged(request, db)
        except Exception:
            request.state.current_user = None
        finally:
            db.close()
        try:
            return await call_next(request)
        except Exception:
            request.state.current_user = None
            raise

app.add_middleware(AuthMiddleware)


# ── Startup ────────────────────────────────────────────────────────────────────

@app.on_event("startup")
def startup():
    init_db()
    _creer_admin_si_absent()


def _creer_admin_si_absent():
    from database import SessionLocal
    from models import User
    from auth import hasher_mot_de_passe
    db = SessionLocal()
    try:
        if db.query(User).count() == 0:
            admin = User(
                username="admin",
                hashed_password=hasher_mot_de_passe("admin"),
                is_admin=True,
            )
            db.add(admin)
            db.commit()
            print("⚠️  Compte admin créé : admin / admin  — À changer immédiatement !")
    finally:
        db.close()


# ── Gestion erreurs ────────────────────────────────────────────────────────────

@app.exception_handler(HTTPException)
async def http_exception_handler(request: Request, exc: HTTPException):
    if exc.status_code == 302:
        return RedirectResponse(url=exc.headers["Location"])
    return templates.TemplateResponse("erreur.html", {
        "request": request,
        "status_code": exc.status_code,
        "detail": exc.detail,
        "current_user": getattr(request.state, "current_user", None),
    }, status_code=exc.status_code)


@app.get("/", response_class=HTMLResponse)
def accueil():
    return RedirectResponse("/factures/")


# ── Filtres Jinja2 ─────────────────────────────────────────────────────────────

def format_montant(valeur):
    if valeur is None:
        return "0,00 €"
    return f"{valeur:,.2f} €".replace(",", " ").replace(".", ",")


def format_date_fr(d):
    if d is None:
        return ""
    mois = ["janvier", "février", "mars", "avril", "mai", "juin",
            "juillet", "août", "septembre", "octobre", "novembre", "décembre"]
    return f"{d.day} {mois[d.month - 1]} {d.year}"


for tpl in [templates, clients.templates, devis.templates,
            factures.templates, auth_router.templates]:
    tpl.env.filters["montant"] = format_montant
    tpl.env.filters["date_fr"] = format_date_fr