from template_helper import render
from fastapi import APIRouter, Depends, Request, Form, HTTPException
from fastapi.responses import HTMLResponse, RedirectResponse, Response
from fastapi.templating import Jinja2Templates
from sqlalchemy.orm import Session

from database import get_db
from models import User
from auth import (
    hasher_mot_de_passe, verifier_mot_de_passe,
    creer_session, get_current_admin, COOKIE_NAME
)
from config import settings

router = APIRouter(tags=["auth"])
templates = Jinja2Templates(directory="templates")


# ── Login / Logout ─────────────────────────────────────────────────────────────

@router.get("/login", response_class=HTMLResponse)
def login_form(request: Request):
    return render(templates, "auth/login.html", request, {
        "erreur": None
    })


@router.post("/login")
def login(
    request: Request,
    username: str = Form(...),
    password: str = Form(...),
    db: Session = Depends(get_db)
):
    user = db.query(User).filter(
        User.username == username, User.actif == True
    ).first()

    if not user or not verifier_mot_de_passe(password, user.hashed_password):
        return render(templates, "auth/login.html", request, {
            "erreur": "Identifiants incorrects."
        }, status_code=401)

    token = creer_session(user.id)
    response = RedirectResponse("/factures/", status_code=303)
    response.set_cookie(
        key=COOKIE_NAME,
        value=token,
        max_age=settings.session_max_age,
        httponly=True,
        samesite="lax",
        secure=False  # Passer à True si HTTPS (recommandé en prod)
    )
    return response


@router.post("/logout")
def logout():
    response = RedirectResponse("/login", status_code=303)
    response.delete_cookie(COOKIE_NAME)
    return response


# ── Gestion utilisateurs (admin) ───────────────────────────────────────────────

@router.get("/admin/utilisateurs", response_class=HTMLResponse)
def liste_utilisateurs(
    request: Request,
    db: Session = Depends(get_db),
    current_user=Depends(get_current_admin)
):
    users = db.query(User).order_by(User.username).all()
    return render(templates, "auth/utilisateurs.html", request, {
        "users": users, "current_user": current_user
    })


@router.get("/admin/utilisateurs/nouveau", response_class=HTMLResponse)
def nouveau_user_form(request: Request, current_user=Depends(get_current_admin)):
    return render(templates, "auth/user_form.html", request, {
        "user": None,
        "titre": "Nouvel utilisateur", "current_user": current_user
    })


@router.post("/admin/utilisateurs/nouveau")
def creer_user(
    username: str = Form(...),
    email: str = Form(""),
    password: str = Form(...),
    is_admin: bool = Form(False),
    db: Session = Depends(get_db),
    current_user=Depends(get_current_admin)
):
    if db.query(User).filter(User.username == username).first():
        raise HTTPException(status_code=400, detail="Ce nom d'utilisateur existe déjà.")
    user = User(
        username=username,
        email=email,
        hashed_password=hasher_mot_de_passe(password),
        is_admin=is_admin
    )
    db.add(user)
    db.commit()
    return RedirectResponse("/admin/utilisateurs", status_code=303)


@router.get("/admin/utilisateurs/{user_id}/modifier", response_class=HTMLResponse)
def modifier_user_form(
    request: Request,
    user_id: int,
    db: Session = Depends(get_db),
    current_user=Depends(get_current_admin)
):
    user = db.query(User).get(user_id)
    if not user:
        raise HTTPException(status_code=404)
    return render(templates, "auth/user_form.html", request, {
        "user": user,
        "titre": "Modifier l'utilisateur", "current_user": current_user
    })


@router.post("/admin/utilisateurs/{user_id}/modifier")
def modifier_user(
    user_id: int,
    username: str = Form(...),
    email: str = Form(""),
    password: str = Form(""),
    is_admin: bool = Form(False),
    db: Session = Depends(get_db),
    current_user=Depends(get_current_admin)
):
    user = db.query(User).get(user_id)
    if not user:
        raise HTTPException(status_code=404)
    # Empêcher de se retirer les droits admin à soi-même
    if user.id == current_user.id and not is_admin:
        raise HTTPException(status_code=400, detail="Vous ne pouvez pas retirer vos propres droits admin.")
    user.username = username
    user.email = email
    user.is_admin = is_admin
    if password:
        user.hashed_password = hasher_mot_de_passe(password)
    db.commit()
    return RedirectResponse("/admin/utilisateurs", status_code=303)


@router.post("/admin/utilisateurs/{user_id}/desactiver")
def desactiver_user(
    user_id: int,
    db: Session = Depends(get_db),
    current_user=Depends(get_current_admin)
):
    user = db.query(User).get(user_id)
    if not user:
        raise HTTPException(status_code=404)
    if user.id == current_user.id:
        raise HTTPException(status_code=400, detail="Impossible de se désactiver soi-même.")
    user.actif = not user.actif
    db.commit()
    return RedirectResponse("/admin/utilisateurs", status_code=303)