from fastapi import APIRouter, Request, Depends, Form
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.templating import Jinja2Templates
from sqlalchemy import text
from ..dependencies import get_current_user
from ..database import SessionLocal, SessionLocalDemo
from ..auth import verify_password, create_access_token, hash_password
from ..services.audit_service import log_login, log_logout, log_login_failed
from ..config import APP_NAME, APP_VERSION

router = APIRouter()
templates = Jinja2Templates(directory="app/templates")

@router.get("/login", response_class=HTMLResponse)
async def login_page(request: Request):
    return templates.TemplateResponse("login.html", {
        "request": request, "app_name": APP_NAME, "version": APP_VERSION, "error": None
    })

@router.post("/login")
async def login(request: Request, username: str = Form(...), password: str = Form(...),
                mode: str = Form("reel")):
    # Select DB based on mode
    factory = SessionLocalDemo if mode == "demo" else SessionLocal
    db = factory()
    try:
        row = db.execute(text("SELECT id, username, password_hash, role, is_active FROM users WHERE LOWER(username) = LOWER(:u)"),
                         {"u": username}).fetchone()
        if not row:
            log_login_failed(db, request, username)
            db.commit()
            return templates.TemplateResponse("login.html", {
                "request": request, "app_name": APP_NAME, "version": APP_VERSION, "error": "Utilisateur inconnu"
            })
        if not row.is_active:
            log_login_failed(db, request, username)
            db.commit()
            return templates.TemplateResponse("login.html", {
                "request": request, "app_name": APP_NAME, "version": APP_VERSION, "error": "Compte desactive"
            })
        try:
            ok = verify_password(password, row.password_hash)
        except Exception:
            ok = False
        if not ok:
            log_login_failed(db, request, username)
            db.commit()
            return templates.TemplateResponse("login.html", {
                "request": request, "app_name": APP_NAME, "version": APP_VERSION, "error": "Mot de passe incorrect"
            })
        # Include mode in JWT token
        token = create_access_token({"sub": row.username, "role": row.role, "uid": row.id, "mode": mode})
        user = {"sub": row.username, "role": row.role, "uid": row.id, "mode": mode}
        log_login(db, request, user)
        db.commit()
        # Redirect
        perms = db.execute(text("SELECT module FROM user_permissions WHERE user_id = :uid"), {"uid": row.id}).fetchall()
        modules = {r.module for r in perms}
        redirect_url = "/quickwin" if modules == {"quickwin"} else "/dashboard"
        response = RedirectResponse(url=redirect_url, status_code=303)
        response.set_cookie(key="access_token", value=token, httponly=True, samesite="lax", max_age=3600)
        return response
    finally:
        db.close()

@router.get("/logout")
async def logout(request: Request):
    user = get_current_user(request)
    if user:
        mode = user.get("mode", "reel")
        factory = SessionLocalDemo if mode == "demo" else SessionLocal
        db = factory()
        try:
            log_logout(db, request, user)
            db.commit()
        finally:
            db.close()
    response = RedirectResponse(url="/login", status_code=302)
    response.delete_cookie("access_token")
    return response